This presentation will provide an overview of the SLAC Metrology organization, focusing on Alignment group activities. The presentation will also cover the instrumentation used for everyday work and projects we recently worked on such as the LCLS-HE undulator upgrade, the Rubin Observatory LSST Camera, and the Super CDMS project.
PETRA IV requires stringent alignment accuracies for close to 300 girders and over 3000 magnets, despite pervasive space constraints. This paper summarizes the alignment progress of the project's current prototype
(pre-project) phase, as well as future plans. Under development are two novel multipole magnet referencing concepts photogrammetric and laser tracker measurements. Each concept...
For stable operation of accelerators, high-precision alignment, positioning, and installation are crucial. Installing all equipment individually inside the tunnel poses safety risks as personnel may be exposed to enclosed and potentially radiative environments for extended periods. To address the challenges of long adjustment times and prolonged maintenance within the tunnel, most accelerator...
Following on from the International Workshop on Accelerator Alignment IWAA 2022, an alignment seminar was organized at the ESRF in June 2023. Four European laboratories: CERN, ALBA, SOLEIL and ESRF participated in this event. It was a very successful one-day event, divided into 7 sessions of 1h each dedicated to specific topics of mutual interest. These topics included: application of...
Over the last years , the European Spallation Source has gone through an intense phase of installation of critical equipments requiring accurate positioning. All previous efforts invested to express geometrical requirements using technical drawings and ISO GPS language have been pursued and largely applied to produce installation drawings based on a generic template. An extended use of ISO GPS...
Fermilab’s PIP-II project will result in a new beamline approximately 510 meters long. A geodetic control network will need to be established to precisely align the beamline components in the tunnel. This design focused on the tunnel network, as the surface network had already been considered. After selecting the geometry, instrumentation, and methodology, a pre-analysis was performed to...
The European Synchrotron Radiation Facility (ESRF) was established in 1988 as the world’s first 3rd generation light source. Alignment was critically important. The quadrupole and sextupole magnet alignment tolerances were 100 µm in both the horizontal and vertical directions perpendicular to the beam.
The vertical tolerance was achievable with high precision levelling, but in the late 1980’s...
Hefei Advanced Light Facility (HALF), a key mega-science facility, has started civil construction since June 2023 in Hefei, China, and National Synchrotron Radiation Laboratory (NSRL) is responsible for the construction. HALF is a 4th generation diffraction limited synchrotron radiation light source which includes a 192 m injector, a 138.4 m transport line, and a storage ring with a...
Research laboratory engineering departments encourage employees to pursue professional development in their field. Within the accelerator alignment community, limited introductory resources address the unique considerations of this specialized discipline. This paper aims to cover important alignment concepts in an engaging and exploratory manner utilizing a multiple-choice quiz format to help...
The accurate placement of magnets is essential for accurate magnetic field measurements. The current positioning technique employed for harmonic coil measurement is inefficient due to its labor-intensive and time-consuming nature. Therefore, we use four cameras to monitor the position of the magnet due to its non-contact feature, and an electrically driven Stewart platform is utilized to...
Cnam has developed Arpent, a two-wavelength ADM where the distances do not depend on the air refractive index, but only on the dispersion. By simultaneously measuring two optical path lengths at two different wavelengths, it is no longer necessary to determine the air temperature and pressure. Arpent measures distances consistent with the SI-metre definition and achieves uncertainties better...
During IWAA2022 at CERN in Geneva a discussion was raised by laser tracker users about the differences in the handling of orient-to-gravity (OTG) measurements between Leica Absolute Tracker AT403 and AT9x0/AT500.
The talk will present a new approach for AT9x0 and AT500 in Spatial Analyzer to provide gravity referenced coordinates in the instrument frame to overcome this issue.
As part of the study on using structured laser light for alignment, an innovative technique is proposed for generating symmetrical pseudo-non-diffracting layers of caustic optical beams, known as Layer Beams (LB). The state of the art for producing similar beams consists of using spatial light modulators. Our approach is based on the design of a generator with a specific arrangement of...
Alignment of superconducting cavities is a critical concern for the China Spallation Neutron Source Phase II (CSNS II) linac. To measure cavity displacement during the cooling process to liquid helium temperature, a new laser-based Poisson Spot Monitor (PSM) system was introduced. This system utilizes the diffraction spot captured on a CMOS camera when a parallel laser beam passes through a...
The High-Luminosity Large Hadron Collider (HL-LHC) project at CERN aims to enhance the LHC's performance and expand its potential for discoveries beyond 2029. New components will be installed within the 220 meters before the collision points of the ATLAS and CMS experiments, including 16 NB3Sn quadrupoles to focus the beam before collision and 8 radio frequency crab cavities to allow beam...
Accurate alignment of beam components in particle accelerators is crucial to optimize machine performance and enhance precision measurement in the experiments. CERN is developing a new process for calculating beam position offsets directly in the field during the alignment stage.
This process benefits from recent developments within CERN’s adjustment software, LGC (Logiciel Général de...
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to enable continuous operation at instantaneous luminosities over double the current LHC value. To meet this goal, components installed in the Long Straight Sections around the ATLAS and CMS experiments must be aligned to within a tolerance of 0.45 mm vertically and 0.2 mm radially over a length of 420 meters. This precise...
Since 2020, we have been continuing to conduct control surveys of the KEK electron-positron accelerator using a laser tracker and digital level. Since analysis has confirmed a trend in beamline fluctuations, we introduce an attempt to experimentally introduce a crack displacement meter to confirm the trend in fluctuations.
Located in the heart of the Paris-Saclay university and technology park, SOLEIL is preparing a major upgrade of its machine and beamlines. This project known as SOLEIL II aims to provide a 4th generation synchrotron light source by the end of 2030. The new storage ring will have an emittance of 85 pm.rad which will naturally arise challenging questions about the solutions to be chosen for its...
The High Energy Photon Source (HEPS) has been under construction since 2019. It is designed to be the first high-energy diffraction-limited synchrotron light source in China. To achieve an ultra-low emittance of less than 60pm.rad, substantial efforts have been invested in the alignment process of the SR. This involves thousands of elements being arranged in a very tight space. To fulfill such...
Recent progress of the SHINE(Shanghai Hard X-ray FEL Facility)
The ongoing feasibility study for the Future Circular Collider (FCC-ee) planned to be built at CERN raises survey and geodetic challenges. Developing an alignment strategy for the 8832 magnets within the 91.2 km circular tunnel, associated transfer lines, and the 2 or 4 experiments is critical. A robust geodetic infrastructure, including the definition of coordinate reference systems and the...
The objective of the Shenzhen Superconducting Soft-X-ray Free Electron Laser (S³FEL) is to develop a free electron laser source utilizing a superconducting linear accelerator operating at an electron energy of 2.5GeV. The facility has a length of approximately 1.8km and features a wavelength range of 1 to 30nm for its Free Electron Laser, aimed at advancing cutting-edge scientific research and...
At the European Spallation Source (ESS), we extensively use Spatial Analyzer (SA) for a variety of applications, including network calculations. A significant challenge has been to involve local gravity observations during the network calculation in SA. To address this, we have developed a solution to represent the local geoid within SA. In this poster we will present our methodology and...
LGC (Logiciel Général de Compensation) is a software that computes position estimates and associated statistics based on observations obtained by CERN surveyors. Since the mid-1980s, LGC has been a crucial tool to perform geodetic computations in various contexts - from simple levelling campaigns to advanced monitoring projects. The CERN Geodetic Metrology group continues to maintain, improve,...
ToLiP, or minimum set of situation features made of (at most) a poinT On a Line In a Plane, has been introduced as an intermediate object between any integral feature's geometry and the coordinate system representing its situation (location and orientation). CoToLiP is the tool to deal with the composition of two ToLiPs. The paper gives background on how this is built and used to encode...
The High Luminosity Large Hadron Collider (HL-LHC) project is an upgrade of the LHC to enable continuous operation at instantaneous luminosities over double that of the current LHC value. To do so, nearly 1.2 km of accelerator components of the present LHC machine will be replaced, applying new, innovative technologies. This includes a Full Remote Alignment System (FRAS) to continuously and...
The High Energy Photon Source(HEPS) was a first fourth-generation synchrotron light source in China, it has an energy of 6 GeV and a circumference of 1360m. Construction began in 2019, and beam commissioning started on July 23,2024. The first beam circulation was achieved on the first day, proving the success of the alignment. This report will introduce the alignment strategy, and the method...
CERN surveyors have been performing the smoothing of beamlines for decades using the 2D + 1 measurement and calculation process, where computing the planimetric (XY) and altimetric (H) data is performed independently and separately. Direct leveling (1D) is still recognized today as the most efficient method to allows accurate vertical determination over long distances.
CERN practices are...
Located in the heart of the Paris-Saclay university and technology park, SOLEIL is preparing a major upgrade of its machine and beamlines. This project known as SOLEIL II aims to provide a 4th generation synchrotron light source by the end of 2030. The new storage ring will have an emittance of 85 pm.rad which will naturally arise challenging questions about the solutions to be chosen for its...
The Advanced Light Source (ALS) achieved first light in 1993. 30 years later, a major effort is taking place to upgrade it to 4th generation light source. There will be two accelerators reside in the same tunnel, one is Accumulator Ring which is hung on the inner wall, another one is Storage Ring which will replace the current ALS Storage Ring. RF system will be shared by the two Accelerators....
Monitor the changes of accelerator components and tunnels are one of the major efforts when the machine is running. Several recent monitoring efforts will be discussed.
Long term measurements above truck tunnel will be updated. Besides, a new wire position system is installed. The system, data processing and results will be shown.
The circumference changes of storage ring in one year are...
The Advanced Photon Source (APS) is a synchrotron X-ray facility located at Argonne National Laboratory, in operation since 1996. The APS recently completed an extensive upgrade, replacing the original APS electron storage ring with a state-of-the-art multi-bend achromat machine. The upgraded storage ring generates X-rays up to 500 times brighter than the original ring.
After more than 25...
The ALS-U project is upgrading the existing Lawrence Berkeley National Laboratory Advanced Light Source to a diffraction-limited soft x-ray light source. There will be two accelerators residing in the existing tunnel, the Accumulator Ring (AR) and the Storage Ring (SR). AR pre-staging (assembly of magnets on rafts) and their installation in the tunnel are currently taking place. This talk will...
