P5 Town Hall at SLAC

2 May 2023, 08:25 → 5 May 2023, 17:00 America/Los_Angeles

SLAC

P5 Town Hall with a focus on

Accelerator, Community Engagement, Theory, and Underground Science

 

P5 (Particle Physics Project Prioritization Panel) makes recommendations on the next 10 years of the US particle physics program within the 20 year context to HEPAP, which advises DOE and NSF. It builds on the extensive community involvement in the Snowmass study. This meeting is part of a series of town halls for information gathering for the panel to learn the aspiration of the community and basic ideas on costs and schedule of proposed projects. 

Town Halls have a set of invited talks on overview of scientific opportunities as well as concrete projects, including their costs and schedules. They also have sessions for the community members to make short (~5min) remarks about their vision for the field, exciting science, projects, and issues of the community. People are encouraged to propose remarks, especially early career scientists. There will be also a time for "open-mic" session for discussions.

The Town Hall will be a hybrid event. Both in-person and remote participants must register. In-person participants will need to submit information for site access. In-person participation is encouraged and all presentations will be in the Kavli auditorium. (Unfortunately, the Panofsky auditorium suffered water damage during the recent storms and is closed for repairs.) The Kavli auditorium is in Building 51, Room 102. It is in the first building you see on your right when you come to the lab from the Main Gate. See the map for its location. Seating in the Kavli auditorium will be available on a first-come, first-served basis up to the capacity of 150. Additional room will be available for all participants in nearby overflow rooms. Zoom information will be provided only for registered participants.

The Town Hall presentations will be on Wednesday and Thursday, May 3 and 4, while Tuesday and Friday are reserved for the P5 committee. 

Tuesday, 2 May

14:00 → 17:00 P5 Committee -- Closed Meeting

Wednesday, 3 May

08:30 → 10:00 Introduction & Overview

Convener: Hitoshi Murayama (SLAC)

08:30 Lab Welcome

Speaker: Stephen Streiffer (SLAC)

08:35 Logistics

Speaker: Rainer Bartoldus (SLAC)

P5 Town Hall Logistics.pdf

08:40 P5 Introduction (remote)

Speaker: Karsten Heeger (Yale University)

SLAC-P5-intro.pdf

09:00 Accelerator Frontier Summary

Speaker: Stephen Gourlay (FNAL)

P5 Snowmass Accelerator Frontier.pdf

P5 Snowmass Accelerator Frontier.pptx

09:30 FNAL Accelerator Complex

Speaker: Mary Convery (Fermilab)

P5ACE.pdf

10:00 → 10:20 Break and Group Photo

10:20 → 12:00 Higgs Options

Convener: Tor Raubenheimer (SLAC)

10:20 ICFA and The ILC International Development Team

Speaker: Tatsuya Nakada (EPFL)

P5_SLAC2023_ILC.pdf

10:35 ILC and SRF

Speakers: Sergey Belomestnykh (Fermilab), Shinichiro Michizono (KEK)

11:00 C3 and NC RF

Speaker: Emilio Nanni (SLAC)

C3 P5 Final.pdf

C3 P5 Final.pptx

11:25 FCCee

Speaker: Frank Zimmermann (CERN)

230503_FCC-ee-US-P5-SLAC-FINAL.pptx

11:45 FCCee US Activities

Speaker: Vladimir Shiltsev (Fermilab)

USFCCeeP5talk.pdf

12:00 → 13:00 Lunch

13:00 → 13:20 Communication

Convener: Hitoshi Murayama (SLAC)

13:00 Communicating HEP to the public (remote)

Speaker: Sean Carroll (Johns Hopkins University)

13:20 → 14:35 10 TeV Options

Convener: Amalia Ballarino (CERN)

13:20 Advanced Accelerator Concepts

Speaker: Spencer Gessner (SLAC)

AAC_to_P5_vFinal.pdf

AAC_to_P5_vFinal.pptx

13:45 Muon Collider

Speaker: Diktys Stratakis (Fermilab)

P5_MuC_Talk_Accelerators_Final.pdf

14:10 Magnets for Energy Frontier Collider

Speaker: Soren Prestemon (LBNL)

Magnets for energy frontier colliders.pdf

Magnets for energy frontier colliders.pptx

14:35 → 15:30 US Accelerator R&D Program

Convener: Mark Palmer (Brookhaven National Laboratory)

14:35 HEP GARD and the US Accelerator R&D Program

Speaker: Mei Bai (SLAC)

GARD4P5-2023.pdf

15:05 National Future Colliders R&D

Speaker: Pushpa Bhat (Fermilab)

P5_SLAC2023_FutureColliders_RD_final.pdf

15:30 → 15:55 Break

15:55 → 16:40 US Accelerator R&D Program

Convener: Mark Palmer (Brookhaven National Laboratory)

15:55 Non-HEP Accelerator R&D, Synergies and Timescales, Workforce (remote)

Speaker: Michiko Minty (Brookhaven National Laboratory)

P5 Town Hall at SLAC - 5 Mar 2023 - Minty .pdf

P5 Town Hall at SLAC - 5 Mar 2023 - Minty .pptx

16:20 NSF-Funded Accelerator Projects/University Work

Speaker: Richie Patterson (Cornell)

Patterson NSF acc sci.pdf

Patterson NSF acc sci.pptx

16:40 → 17:50 Underground Science

Convener: Richard Schnee (South Dakota Mines)

16:40 Underground Frontier Overview

Speaker: Jeter Hall (SNOlab)

UF&I - Jeter Hall - P5 SLAC May2023.pdf

17:00 SURF Expansion

Speaker: Jaret Heise (Sanford Underground Research Facility)

SURF - P5 Town Hall-Heise-2023_05_03.pdf

17:20 ARGO

Speaker: Cristiano Galbiati (Princeton)

SLAC P5 May 3 3023.pdf

18:30 → 20:00 Reception

Thursday, 4 May

08:30 → 10:15 Theory

Convener: Jesse Thaler (MIT)

08:30 Snowmass Theory Summary

Speaker: Nathaniel Craig (UC Santa Barbara)

P5_SLAC_TF_Craig.pdf

09:00 Highlighting the Importance of Theory to HEP Projects

Speaker: Radja Boughezal (Argonne National Laboratory)

Boughezal-P5-SLAC-2023.pdf

09:20 Highlighting Theory in its own Right

Speaker: Juan Maldacena (Institute for Advanced Study)

P5Talk2023.pdf

P5Talk2023.pptx

09:40 Lattice

Speaker: Ethan Neil (University of Colorado)

neil-p5-0523-v3.pdf

10:00 QIS and QFT

Speaker: Christian Bauer (LBNL)

QIS&QFT.key

QIS&QFT.pdf

10:15 → 10:45 Break

10:45 → 11:25 Accelerators and Society

Convener: Cameron Geddes (LBNL)

10:45 HEP and Industry (remote)

Speaker: Matt Garrett (SLAC)

11:05 Particle Physics, Sustainability and Climate

Speaker: Ken Bloom (Nebraska-Lincoln)

bloom_climate_impacts_p5.pdf

11:25 → 11:50 Community Engagement

Convener: Peter Onysi (Texas Austin)

11:25 Community Engagement Frontier

Speaker: Kétévi Assamagan (Brookhaven)

P5-Townhall-CEF-May2023.pdf

11:50 → 12:50 Lunch

12:50 → 14:15 Community Engagement

Convener: Peter Onysi (Texas Austin)

12:50 Public Policy and Government Engagement (remote)

Speaker: Louise Suter

P5townhall_PPGE.pdf

13:10 Early Career Report

Speaker: Julia Gonski (Columbia)

0504_jgonski_p5townhallSLAC_earlycareer.pdf

13:30 Climate of the Field

Speaker: Erin Hansen (UC Berkeley)

P5_ClimateTalk.pdf

13:50 Non-Physicists in the HEP Community: Inclusion, Recognition, and Valuing their Contributions (remote)

Speaker: Cindy Joe (Fermilab)

P5 Town Hall Non-Physicists in HEP.pdf

13:55 Q&A with Speakers

14:15 → 14:55 Contributed Remarks

Convener: Robert Zwaska (Fermilab)

Slides.pdf

14:15 Stress-testing the Standard Model of Particle Physics using the Effective Field Theory formalism (remote)

The Standard Model (SM) of Particle Physics, which has reigned supreme for the last 60 years, is being stress-tested at the highest energy scales at the Large Hadron Collider (LHC). While an increasingly large number of processes are being studied with unprecedented precision, rare processes with novel and complex topologies predicted by the SM are being observed at the LHC. The current physics program of the LHC encompasses fourteen orders of magnitude in cross section. Precise theoretical computations exist across this huge range of cross sections enabling a comprehensive exploration of the SM. Deviations from SM predictions could point to the existence of New Physics. The formalism of an Effective Field Theory provides a theoretically consistent way of characterizing the potential nature of NP that uses all possible measurements. In this brief remark, I will talk about how constraints set on certain kinds of theoretically allowed, yet so far unobserved interactions enable us to obtain a glimpse of an underlying theory of NP, providing crucial input for future experiments.

Speaker: Saptaparna Bhattacharya (Northwestern University)

P5Talk_SMEFT.pdf

14:20 Paths for the Future of Collider Physics

Compact collider designs---the Cool Copper Collider for a Higgs factory and the muon collider to reach the 10 TeV parton scale---emerged during Snowmass as a promising path for the future. I will briefly present the benefits of these options, which utilize power-efficient, innovative technology that can scale to even higher energies beyond the next generation of experiments. P5 support for accelerator R&D to pursue the viability of these new colliders is crucial for the health of the field as we start to look toward the post-LHC era. I will specifically discuss the budgetary perspective, informed by my role as Deputy Chair of Government Relations for the Fermilab Users Executive Committee.

Speaker: Kevin Pedro (Fermilab)

Paths for the Future of Collider Physics SLAC new.pdf

14:25 Energy consumption and carbon footprint of proposed e+e- Higgs factories

The energy consumption of any of the e+e- Higgs factory projects that can credibly operate immediately after the end of LHC, namely three linear colliders (CLIC, operating at √s=380 GeV; and ILC and C^3, operating at √s=250 GeV) and two circular colliders (CEPC and FCC-ee, operating at √s=240 GeV), will be everything but negligible. Future Higgs boson studies may therefore have a significant environmental impact. Questions of sustainability should be taken into account in the choice of facilities. In particular, our first responsibility as particle physicists is to do the maximum amount of science with the minimum energy consumption and the minimum environmental impact for our planet. Once the desired physics outcome of a Higgs factory is agreed upon (i.e. the number of Higgs bosons to be produced), FCC-ee can deliver this outcome ten times faster and with an order of magnitude less energy (electricity) consumption than linear colliders. If it were to run today, the corresponding carbon footprint of the FCC-ee Higgs factory at CERN would also be up to two orders of magnitude smaller than that of linear counterparts proposed in other parts of the world.

Speaker: Julia Gonski

0504_jgonski_p5townhall_energyhiggsfactories.pdf

14:30 Accelerating Discoveries: A Path to a Robust US Accelerator Workforce (remote)

A 10 TeV scale collider is crucial to unravel the mysteries of the universe. However, we must urgently invest in growing the US accelerator workforce in order to build any proposed future collider. Many experimental particle physicists have become interested in pursuing collider R&D in order to help our accelerator colleagues reduce long timescales associated with 10 TeV scale technology. A robust national collider R&D program emphasizing innovative, compact, and power-efficient proposals would attract new talent to the field and be a bold step towards sustainability. In this remark, I will discuss concrete actions we can take to grow the US accelerator work force, including new pathways for experimental particle physicists to join the effort.

Speaker: Karri Folan Di Petrillo (University of Chicago)

2023.05.04.kdp.P5AccWorkforce.pdf

14:35 Unveiling the Hidden Sector of Diversity and Inclusion: Neurodiversity and Invisible Disabilities

Historically, neurodiversity and invisible disabilities are the hidden aspects of DEI that are often overlooked in the efforts in our community, resulting in low to non-existent open representations and discrimination affecting excellent researchers at all levels. We will review limited but relevant studies and current efforts to increase representation [1,2,3], awareness, and support from the perspective of early-career researchers. We will also talk about the nationwide shortage of ADHD medication as well as the activities of National Autism Awareness Month.
[1] 30% of people with ADHD have chronic unemployment issues, https://adhdatwork.add.org/
[2] 42% of young adults who experience Autism never worked for pay during their early 20s, https://autismsociety.org/
[3] These can be compared to 10% unemployment for disabled persons and the US national average of 4%.

Speaker: Dr Yu-Dai Tsai (University of California, Irvine)

Neurodiversity_Tsai.pdf

14:40 Expanded Accelerator Options for Forefront New Physics Searches

There is a collection of <$50M BSM-search experiments that have not yet been considered as a set by P5: those running at accelerators other than at FNAL and CERN. Examples include CCM, COHERENT, IsoDAR, JSNS2, and LDMX. All of these experiments utilize accelerators that feature capabilities that are not currently accessible at FNAL and CERN. By exploiting accelerators with different capabilities, these experiments can access BSM physics that is entirely new, pointing the way for the future HEP program. They are “good buys” because infrastructure comes from host labs outside of mainline US HEP. The connections built by HEP scientist interactions with those in nuclear physics, basic energy sciences, and physicists in international communities help to funnel new ideas about accelerator-based experiments back into US HEP and build allies for US HEP. This talk will request that P5 give specific endorsement to continuation of this thriving program of small accelerator-based BSM experiments beyond the “mother laboratories” of FNAL and CERN.

Speaker: Janet Conrad (MIT)

SLACP5TownHall_Conrad.pdf

14:45 An LGAD-based full active target for the PIONEER experiment

PIONEER is a next-generation experiment to measure the charged-pion branching ratio to electrons vs. muons and the pion beta decay with an order of magnitude improvement in precision. A high-granularity active target (ATAR) is being designed to provide detailed 4D tracking information, allowing the separation of the energy deposits of the pion decay products in both position and time. The chosen technology for the ATAR is Low Gain Avalanche Detectors (LGAD). These are thin silicon detectors with moderate internal signal amplification. To achieve a ~100% active region, several technologies still under development are being evaluated, such as AC-coupled LGADs (AC-LGADs) and Trench Insulated LGADs (TI-LGADs). Since a range of deposited charge from Minimum Ionizing Particle (MIP, few 10s of KeV) from positrons to several MeV from the stopping pions/muons is expected, the detection and separation of close-by hits in such a wide dynamic range will be the main challenge. Furthermore, the compactness and the requirement of low inactive material of the ATAR present challenges for the readout system, forcing the amplification chip and digitization to be positioned away from the active region. In the contribution, a brief introduction to the LGAD active target idea for PIONEER and for general applications will be made.

Speaker: Simone Mazza

140323_P5_ATAR.pdf

14:50 Invest in HTS magnet technology to enable sustainable energy-frontier colliders (remote)

Future energy-frontier circular colliders must be sustainable in cost, performance and environmental impact. We argue from first principles that the high-temperature superconducting (HTS) magnet technology can enable sustainable future circular colliders, including a muon collider. The technology, however, is in its infancy, facing significant challenges. To ensure the technology readiness within the next decade for the next circular collider, we need to significantly invest to initiate and sustain a robust R&D ecosystem, covering the conductor supply chain, magnet technology development and engagement of physicist end users.

Speaker: Anis Ben Yahia (Brookhaven National Laboratory)

p5_HTS_magnets_A_Ben_Yahia_2.pdf

14:55 → 15:25 Break

15:25 → 17:20 Contributed Remarks

Convener: Robert Zwaska (Fermilab)

Slides.pdf

15:25 Near term applications driven by advanced accelerator concepts en route towards high energy physics deployment

While the long-term vision of the advanced accelerator community is aimed at addressing the challenges of future collider technology, it is critical that the community takes advantage of the opportunity to make large societal impact through its near-term applications. In turn, enabling robust applications strengthens the quality, control, and reliability of the underlying accelerator infrastructure. A successful near-term application environment will naturally guide particle accelerator technology to maturity. This contribution summarizes a selection of key near-term applications that are, or will be, enabled by advanced accelerator concepts in the next 5-10 years. These exciting developments include the first demonstrations of plasma FEL lasing, the generation of extremely compressed electron beams, particle physics beamdump experiments and medical applications, among others.

Speaker: Claudio Emma (SLAC)

p5Townhall_052023.pdf

15:30 Next Generation Beams: Exploring the potential of muon acceleration (remote)

For decades of energy frontier exploration, we’ve utilized the two charged particles that are easiest to produce and manipulate, the proton and the electron. As we contemplate the future of high energy colliders, the use of these particles fundamentally limits our potential energy reach: the low electron mass due to synchrotron radiation and the proton due to its composite nature. Luckily, the Standard Model provides an alternative: the muon. In this brief talk, I’ll discuss why now is the time to fully explore taking advantage of this massive but fundamental particle, and invest in an R&D program aimed at a future muon collider.

Speaker: Tova Holmes (University of Tennessee, Knoxville)

2023-04-05-SLACTalk.pdf

15:35 High average gradient in a laser-gated multistage plasma wakefield accelerator (remote)

Beam-driven plasma wakefield accelerators provide accelerating
gradient several orders of magnitude higher than currently available RF technology. When considering staging of multiple plasma accelerator modules to reach TeV energies, inter-plasma components and distances rapidly become
one of the biggest contributors to the total accelerator length and therefore may reduce the average gradient. We would like to suggest and discuss a staging design,that combines gating of the accelerator via a femtosecond ionization lasers with driver-coupling in the temporal domain. Results show that GV/m average gradients are achievable.

Speaker: Alexander Knetsch (SLAC)

Knetsch_HighAverage.pdf

15:40 Solving the Leaky Pipeline and the Two-Body Problem (remote)

Stemming the leaky pipeline in physics has become a common topic in diversity, equity, and inclusion discussions in our field. A 2016 study [1] by Ivie, White, and Chu of the American Institute of Physics examines the results of a Longitudinal Study of Astronomy Graduate Students, commissioned to examine the factors that affect retention for both women and men. They found that “Relationship with graduate advisors and the two-body problem both had significant effects on working in physics or astronomy, as did completing a postdoc. The sex of the respondent had no direct effect on our measures of attrition, but indirectly affected attrition because women were less likely to report positive relationships with graduate advisors and more likely to report two-body problems.” Of course, this issue extends past women and impacts other minoritized groups not considered in this study, such as those in the LQBTQ community. Considering the large impact of this issue, our ask is to request specific funding to aid partner hires, especially for those universities and labs that do not have mechanisms in place to support them.

[1] https://journals.aps.org/prper/pdf/10.1103/PhysRevPhysEducRes.12.020109

Speaker: Christine McLean (Argonne National Lab)

LeakyPipeline_McLeanBonilla_SLACP52023.pdf

15:45 LDMX: Current status and synergies between small and large experiments (remote)

New concepts for compact and low cost detectors in existing or proposed accelerator beamlines have emerged as an essential component of the energy and intensity frontiers. Many experiments show excellent potential for measurement and discovery, but some are only made possible through knowledge and technology transfers from larger scale experiments. The Light Dark Matter eXperiment (LDMX) is an example of this synergy since it deploys technologies gleaned from the CMS, Mu2e and HPS experiments. LDMX is a proposed missing-momentum search at SLAC’s electron beamline that has definitive discovery potential for all the MeV-GeV thermal dark matter milestones. In this remark, I will highlight recent results from data analysis from a recent sub-detector prototype test beam. I will draw on my work on both the CMS HGCAL readout and the LDMX calorimeter readout to emphasize how detector technology transfer supports these experiments.

Speaker: Cristina Mantilla Suarez (SLAC)

LDMX_P5_V2.pdf

15:50 Dielectric Laser Accelerators

Particle acceleration in dielectric microstructures powered by infrared lasers, or “dielectric laser acceleration" (DLA), is a promising area of advanced accelerator research with the potential to enable more affordable and higher-gradient accelerators for energy frontier science and a variety of applications. DLA leverages well-established industrial fabrication capabilities and the commercial availability of tabletop lasers to reduce cost, with demonstrated axial accelerating fields in the GV/m range. Considerable progress has been made in this area over the last 7 years due to a large international collaboration of universities and government laboratories. This type of accelerator naturally operates with low bunch charge, microbunch durations on the sub-optical time scale, and high repetition rates. In the HEP application space, this unique parameter regime maps well onto indirect (missing momentum) dark matter search fixed target experiments.

Speaker: Joel England (SLAC)

DLA_P5TownHall_2023.pptx

15:55 FACET-II Addresses Key Needs for a Plasma-Based Collider

Plasma Wakefield Acceleration (PWFA) provides ultrahigh acceleration gradients of up to 10’s of GeV/m, providing a novel path towards efficient, compact, 100+ GeV e-e+ and gamma-gamma linear colliders. The FACET-II National User Facility at SLAC National Accelerator Laboratory hosts a diverse experimental program that will investigate beam-driven plasma wakefield acceleration, injection, and control with the aim of demonstrating efficient multi-GeV/m PWFA while preserving emittance and narrow energy spread. The objectives and preliminary results from FACET-II towards applying PWFA to reach the beam parameters for a future linear collider will be discussed, including beam-driven acceleration, plasma lenses, and non-linear strong-field QED.

Speaker: Doug Storey (SLAC)

dstorey - 2023-05-4 - P5 FACET-II.pdf

dstorey - 2023-05-4 - P5 FACET-II.pptx

16:00 XCC: XFEL Compton Gamma Gamma Collider Higgs Factory

Please see our abstract here.

Speaker: Timothy Barklow (SLAC)

XCC_P5_Remarks_04may2023.pdf

XCC_P5_Remarks_Script_04may2023.pdf

16:05 Topics for BNL Participation in the CERN FCC-ee Feasibility Study (remote)

The FCC-ee project under study at CERN is a circular lepton collider operating at beam energies from 45 to 175 GeV [1]. Careful optimization of the Interaction Region (IR) magnet designs and the Machine Detector Interface (MDI) present critical challenges to insure the best possible FCC-ee physics performance [2]. We believe that US laboratories can and should play an important role in strengthening the FCC-ee IR design team. In this note we give, as one example, how the Magnet Division (MD) at BNL has both significant experience and technical capabilities to contribute to the FCC-ee Feasibility Study effort. The FCC-ee IR design work will build upon previous lepton collider projects such as those for BEPC-II, ILC and SuperKEKB and is synergistic with the work on the lepton-hadron colliders namely HERA-II and the current EIC project at BNL; BNL MD had/has major IR magnet and MDI responsibilities with every one of these projects. For instance, BNL’s Direct Wind magnet production technique was used to manufacture a wide variety of compact superconductor coils, both correctors and main magnets, to meet exacting space and harmonic field content requirements [3,4]. For the MDI, BNL MD has always been closely involved in setting functional requirements and implementing magnet, cryostat, support and the cryogenic cooling and current lead solutions which continues with the EIC IR design. Close inspection of the present FCC-ee IR baseline highlights areas where state-of-the-art solutions are required, and we believe that by building upon our experience with both the EIC and SuperKEKB we can make major original contributions to the FCC-ee Feasibility Study efforts in concert with other US laboratories.

References

[1] Future Circular Collider Study. Volume 2: The Lepton Collider (FCC-ee) Conceptual Design Report, preprint edited by M. Benedikt et al. CERN accelerator reports, CERN-ACC-2018-0057, Geneva, December 2018. Published in Eur. Phys. J. ST.
[2] M. Koratzinos, A. Blondel, A. Bogomyagkov, S. Sinyatkin, M. Benedikt, B. Holzer, J. Van Nugteren, F. Zimmermann and K. Oide, "The FCC-ee interaction region magnet design," arXiv preprint arXiv:1607.05446, 2016.
[3] B. Parker, "Direct Wind Magnets for the ILC, SuperKEKB, FCC-ee and the Electron-Ion Collide," contribution to 65th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e- Colliders (eeFACT2022), INFN Frascati, September, 2022, at URL: https://agenda.infn.it/event/21199/contributions/173697/attachments/96336/132644/Parker_DirectWindMagnets.pptx.
[4] B. Parker, et. al., “BNL Direct Wind Superconducting Magnets,” Contribution 4FO-6 to MT22, Marseille, France, September, 2011.

Speaker: Mithlesh Kumar (Brookhaven National Laboratory)

P5_SLAC_mkumar_BNL.pptx

16:10 Some comments in the status of high energy physics (remote)

Success in high energy physics has traditionally been defined as discovering new particles. There has not been much of that happening in recent years, and if we continue to think in this way then it now seems quite likely we are headed towards a future of failure. I will argue that the solution to this problem is broadening the nature of the field, and I will also emphasize that in practice this is already happening. It is time for "official" priorities and communications to reflect this.

Speaker: Daniel Harlow (MIT)

p5.pdf

16:15 Maximizing the US investment at the LHC and beyond through a precise understanding of theoretical effects (remote)

Ambitious experimental programs at the LHC and future colliders rely on a precise understanding of theoretical QCD uncertainties, and require significant development to improve and validate the tools used to assess these effects. A better understanding of these uncertainties is already critical at the LHC, and will become increasingly important at the HL-LHC and at future colliders. This talk, following up on several abstracts and discussions at the last P5 Town Hall meeting, will highlight how progress on the central EF science drivers, including studies of the Higgs boson, searches for dark matter, and more, will elevate demands for understanding theory uncertainties covering a broad range of effects. I will motivate increased funding for efforts to encourage close cooperation between theorists and experimentalists, including improvements to Monte-Carlo predictions, parton distribution functions, higher-order calculations, and experimental tests of these developments. I will emphasize the importance of community-wide standards and culture for computational tool maintenance in the upcoming experiments. Finally, I will present several concrete proposals for how the collaboration between the theory and the experimental community can be improved for a broad range of existing and planned projects with the support of P5.

Speakers: Phil Ilten (CERN), Jennifer Roloff (Brookhaven National Laboratory)

roloff_p5_townhall.pdf

16:20 High-Power Targetry R&D for Next-Generation Accelerator Facilities

As next-generation accelerator target facilities, for Neutrino Program such as the Long-Baseline Neutrino Facility (LBNF) or Muon Program such as Mu2e-II at Fermilab, become increasingly more powerful and intense, high power target systems face key technical challenges. Beam-intercepting devices such as beam windows and secondary particle-production targets are continuously bombarded by high-energy high-intensity pulsed proton beams to produce secondary particles for several High Energy Physics (HEP) experiments. Energy deposition from the primary beam induces near instantaneous heating (thermal shock) and microstructural changes (radiation damage) in the beam-intercepting materials. Both thermal shock and radiation damage ultimately degrade the performance and lifetime of targets and have been identified as the leading cross-cutting challenges of high-power target facilities. Several facilities have already had to limit their beam power because of the survivability of their targets and windows, rather than as a limitation of the accelerators themselves. As beam power in next-generation multi-megawatt accelerator target facilities continue to increase, there is a pressing need to address the material challenges to avoid limiting the scope of future HEP experiments. This talk will highlight the critical materials R&D needs to address the challenges of high-power targets.

Speaker: Frederique Pellemoine (Fermilab)

HPT RD - P5 Town Hall - F-Pellemoine- open session.pdf

16:25 Hiring practices in high energy theory

The theory community has a strong tradition of coordinating postdoc acceptance deadlines to be Jan 7th each year, to give early career scientists the best possible picture of their options before making important career decisions. However, as the community has continued to evolve, the January 7 deadline proposed in the original 2007 agreement may not be the most optimal option anymore. More concretely, the deadline falls around the holiday season challenging the possibilities for both the candidates and the faculty to have detailed conversations. We therefore propose updating the timing of this response deadline by seeking community input, as well as establishing some “best practices” for postdoc and faculty hires.

Speaker: Simon Knapen (Lawrence Berkeley National Lab)

p5_jan7.pdf

16:30 Normal Conducting Radio Frequency Cavities for Ionization Cooling in a Muon Collider

The TeV muon collider relies on the ionization cooling to significantly reduce the muon beam emittance within a short time. Achieving high gradient in the NCRF cavities with multi-tesla B field background is one technical challenge for the ionization cooling channel. Recent R&D progress has demonstrated the feasibility of such cavities in principle and developed several key engineering features. Future R&D will aim at the engineering maturity for building a cooling demonstrator, as well as further increasing the operation gradient with novel methods to overcome the RF breakdown.

Speaker: Tianhuan Luo (Lawrence Berkeley National Laboratory)

NCRF_MuC_Luo.pdf

16:35 A 10 TeV Muon Collider for Future of Particle Physics (remote)

The 2021 Snowmass process made clear that there is a strong scientific case and broad community interest in a 10 TeV muon collider to reach the multi-TeV scale as quickly as possible. In these remarks, I will discuss the importance of investing in R&D in this pursuit from an early career theorist’s perspective, and discuss some highlights of the physics case for such a collider. I will focus in particular on the complementarity with other current and future physics programs and on the importance of support for theorists in this R&D stage to ensure any future collider program can make full use of its potential.

Speaker: Samuel Homiller (Harvard)

230504_slac_p5_muoncollider_homiller.pdf

16:40 Multidisciplinary nature of modern HEP

The HEP program has evolved over the years to require combined expertise from traditionally separate areas. As an illustration, to get the most physics out of today’s neutrino experiments requires combined expertise in particle physics, nuclear physics, astrophysics, and QIS. The point I would like to raise is the need to train the next generation of theorists with these skills, while also offering them clear career paths and funding opportunities.

Speaker: Alexander Friedland (SLAC)

Friedland P5 May4 2023.pdf

16:45 Ensuring a Bright Future for HEP in the U.S. with a Commitment to Big Ideas

The decision of which projects to support over the next 10 years must be made with a vision for how our field and our community will look 10 years from now and beyond. The future landscape must be attractive to young people from both a scientific perspective - interesting technical challenges, exciting technology, and the prospect of doing discovery science - and from a career perspective - access to long term academic and non-academic jobs. Furthermore, we must acknowledge the links between project decisions and our efforts on community engagement. The right project, together with the right outreach effort and framing, can capture the imaginations of the public and the eye of policymakers as has been seen recently with the James Webb Space Telescope among other projects. Many of the proposals in the Snowmass process, including several based in the U.S., leverage new technology to push the limits of what can be achieved to maximize our scientific capabilities. Such projects can be more effective at attracting the interest of young scientists and the public alike.

Speaker: Ryan Roberts (UC Berkeley)

SLAC_townhall.pdf

16:50 Open Mic

17:20 → 17:40 Laboratory Program

Convener: Hitoshi Murayama (SLAC)

17:20 SLAC Lab Program

Speaker: Aaron Roodman (SLAC)

SLAC P5 town hall v2.pdf

Friday, 5 May

08:30 → 15:30 P5 Committee -- Closed Meeting