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Workshop on Test Beam Opportunities at SLAC's LESA (Linac to End Station A) Facility
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America/Los_Angeles
48/1-112A/B/C/D - Redwood A/B/C/D (SLAC)
48/1-112A/B/C/D - Redwood A/B/C/D
SLAC
90
Description
The workshop will be held in the Redwood Rooms, 1st floor of building 048
Registration
LESA Test Beam Registration
Participants
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LESA FacilityConvener: Timothy Nelson (SLAC)
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- 2
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3
LESA Facility OverviewSpeaker: Thomas Markiewicz (SLAC)
- 4
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10:15
Coffee
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Lessons from Early Tests and Other FacilitiesConvener: Carsten Hast (SLAC)
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5
Experience with LDMX slice test at S30XL spring 2025Speaker: Lauren Tompkins (STANFORD U., HEPL)
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- 7
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8
FTBF ExperienceSpeaker: Evan Niner (Fermi National Accelerator Laboratory)
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5
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12:30
Lunch
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User Talks: Block AConvener: Philip Schuster (SLAC)
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9
Precise timing and position needs for AC-LGAD testing
Low Gain Avalanche Detectors (LGADs) feature a fast rise time (~500 ps), exceptional time resolution (down to 17 ps), and the potential for very high repetition rates, with full charge collection in about 1 ns. These properties make them attractive for near-future experiments such as e⁺e⁻ Higgs factories (e.g., FCC-ee) and the ePIC detector at the Electron–Ion Collider. However, conventional LGADs face two main challenges in these contexts: intrinsically low granularity and the high power consumption of readout chips needed for precise timing. AC-coupled LGADs (AC-LGADs), in which the readout metal is AC-coupled through an insulating oxide layer, offer a promising solution to both issues. Their 100% fill factor and charge-sharing capabilities enable sub-pitch position resolution, surpassing the pitch / √12 limit of standard segmented detectors.
To fully evaluate AC-LGAD performance for these applications, detailed characterization in test beams is essential. Such facilities must provide timing and spatial resolutions significantly better than those of the devices under test, likely below 10 ps in timing and under 5 µm in position, to ensure accurate measurements.Speaker: Simone Mazza -
10
Testing Wide Band Gap Devices for Fast Timing Applications
Low Gain Avalanche Detectors (LGADs) fabricated in wide band gap materials including Silicon Carbide (SiC) and Gallium Nitride (GaN) show promise for application to future colliders. Test beams, such as LESA, could be well suited for a range of studies such as timing and spatial resolution, and performance after irradiation. Our collaboration has already performed a number of test beam runs at the SLAC NLCTA area but our studies are limited by the low energy of the beam. We will describe our future needs at a facility like LESA, in terms of beam conditions, scheduling, and infrastructure.
Speaker: Dr Carl Haber (LBNL) -
11
4D Tracker Testbed
4D Pixel detector will be a necessity for tracking detector at future colliders such as the Muon Collider or Future Circular Collider. To advance the R&D towards these 4D Pixel detector we are proposing a demonstrator project that aims at developing a full 4D tracking telescope that serves two purposes: (1) understand a 4D tracking system as a whole and (2) aid characterization of single component 4D tracking prototypes like sensors and readout chips. The proposed LESA beam line delivers the perfect environment to test high precision tracking detectors and deploy this 4D tracking telescope, thanks to the combination of sub-ps bunch length, configurable bunch charge, and high repetition rate.
Speaker: Timon Heim (Lawrence Berkeley National Lab (LBNL)) - 12
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9
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Discussion: Timing (with coffee)Convener: Natalia Toro (SLAC)
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13
End Station A Tour
Meet at the Redwood Rooms; we will proceed as a group to End Station A
Speaker: Carsten Hast (SLAC)
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User Talks: Block BConvener: Mei Bai (SLAC)
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14
Needs for photon science, fusion energy, and securitySpeaker: Christopher Kenney (SLAC)
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15
High-Precision and High-Dynamic Range Tracking of Dose Deposition by GeV BeamsSpeaker: Emilio Nanni (SLAC)
- 16
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09:15
Coffee Break
- 17
- 18
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19
Past and Future Test Beams for Experiments at BrookhavenSpeaker: John Haggerty (Brookhaven National Lab)
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20
Tests Beams for the DRD6 R&D Collaboration
The Detector R&D Collaboration for Calorimeters (DRD6) was established at CERN to pursue research in calorimeter technologies and concepts for future colliders. While the technologies under development vary greatly in both nature and maturity, the common complexities of detector testing led to the formation of a test beam and tools and software working group to tackle these challenges through shared expertise, common tools, and coordinated efforts. Calorimeter test beams are particularly challenging given the scale required for particle containment and often the integration of different technologies for electromagnetic and hadronic interactions. Within DRD6, there are many electromagnetic calorimeter concepts that could benefit from the electron beam LESA could provide. We will highlight the plans of the working group, as well as the beam parameters, services, and instrumentation that could make LESA an ideal location, with the primary interest being variable beam energy, tracking capabilities, EUDAQ integration of beam instrumentation, and the ability to accommodate large detectors.
Speaker: Prof. Bob Hirosky (U. Virginia)
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14
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LESA Facility: Potential Future Directions
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21
Opportunities with plasma-accelerated electrons at LESA
The S30XL/LESA beamline enables a unique opportunity to deliver plasma-accelerated beams to HEP users. The high-quality LCLS-II bunch can drive high-amplitude wakes in plasma, allowing for multi-GeV acceleration of electrons in a few centimeters. High energy acceleration of continuous spectrum electron beams has been demonstrated at both SLAC's FFTB and FACET facilities. Further tests are planned for FACET-II, which will demonstrate the viability of this approach for the S30XL/LESA beamline. We aim to deliver single electrons with energy greater than 20 GeV with precision timing to LESA users.
Speaker: Spencer Gessner (SLAC)
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21
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Discussion: Instrumentation; Beam Characteristics (e.g. charge, current, time structure, ...); Other Experiment NeedsConvener: Thomas Markiewicz (SLAC)
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22
Takeaways
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12:30
Lunch and continuing informal discussions
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