Japan was struck by the Great East Japan Earthquake in March 2011.
Both the KEK Tsukuba and Tokai campuses sustained damage, and the accelerators suffered extensive destruction.
Highlights of the situation immediately following the disaster and the process of recovery will be reported.
The introduction of new portable high-precision laser scanners represents a significant advancement in metrology, enabling direct high-accuracy and non-contact measurements.
CERN surveyors are currently evaluating and developing new workflows to integrate the Leica Absolute Tracker ATS800 into measurement campaigns, particularly in highly radioactive environments, where minimising personnel...
Multiple chambers for the cavity-based X-ray free-electron laser (CBXFEL) have been designed, assembled, measured and tested by Argonne National Laboratory (ANL). The fiducialization and the features inspection of all the critical components are performed by mean of both probe-contact articulated arm and non-contact video microscope. All metrological aspects for crystal diamonds and...
Reliable tunnel magnet alignment demands a systematic precheck strategy to decide whether a candidate single-station setup is sufficient, requires additional key points, or should be adjusted before full observation. This work introduces a station precheck and decision-support prototype that integrates uncertainty-aware metrology with structured scene reasoning.
The uncertainty model combines...
The on-site installation of the Alignment of Hefei Advanced Light Facility (HALF) project commenced in March 2026, with all component installations scheduled to be completed by the end of the year. At present, the preliminary installation of the injector and transport line has been finished, entering the precision alignment stage in the measurement hall. Meanwhile, the preliminary installation...
The Hefei Advanced Light Source (HALF) facility requires a high-precision tunnel control network to support accelerator alignment, equipment installation, and long-term geometric stability. This study focuses on the design and data processing optimization of particle accelerator tunnel control networks. An automated simulation workflow based on laser tracker measurement planning is developed...
As a core component of the Hefei Advanced Light Facility (HALF), the storage ring's magnetic element arrangement accuracy and beam optical performance directly affect the device's operating efficiency and beam quality. To address potential geometric deviations during the installation of the HALF storage ring, this paper focuses on smooth adjustment, establishing an analytical framework from...
A major fire on 5 February 2026 in the RF Gallery at GSI almost completely destroyed the installation and equipment parts of the existing facility. This fire had such serious consequences that beam operations at GSI – and consequently the First Beam Event for the new facility FAIR – could not take place. Soon after the fire, initial ideas and discussions emerged on how to enable adequate...
Fermilab’s PIP-II project will result in a new beamline approximately 550 meters long and will require establishing a geodetic control network to align all beamline objects in the tunnel. The first installation stage involves lower-precision alignment of objects such as stands and girders. The second installation stage involves high-precision alignment of beamline components. At Fermilab, a...
In IWAA 2024, we presented an absolute distance meter (ADM) for long-range measurements, achieving uncertainties below 1 mm (k=1) over distances of up to 12 km. This instrument uses two laser wavelengths, one in the visible and the other in the infrared, to measure the difference in optical path length between them. This additional measured quantity corresponds to the accumulated effect of the...
Increasingly stringent alignment requirements in particle accelerators have led to the development of dedicated high-accuracy alignment systems. While qualification procedures exist for standard metrology instruments, no established methodology is available for the qualification of research and development alignment systems and their associated references. This paper presents a generic...
The European Synchrotron Radiation Facility (ESRF) operates a well-established program of comprehensive Storage Ring (SR) and regular machine surveys to maintain the geometric integrity of the accelerator and serve as the primary reference for all beamlines. Over the past three decades, the SR survey has evolved into a highly coordinated activity comprising nearly 10,000 measurements completed...
The Survey and Alignment Group measures its primary network of reference points through a full survey managed every six months. This survey consists of nearly 9,000 measurements acquired using laser tracker-based tacheometry and direct leveling with digital levels. It is carried out during the first week of each semi-annual machine shutdown and involves between one and four teams working...
Beyond existing specification tools: how to specify / request on a drawing an alignment specification using ISO GPS situation features
Prototypes of storage ring magnets for the Siam Photon Source II (SPS-II), Thailand’s next-generation 3 GeV synchrotron light source, have been successfully developed. The prototype magnets achieved a pole profile accuracy within 20 µm and an assembly accuracy better than 40 µm. The original magnet alignment was performed using mechanical adjustment. Initial magnetic field characterization...
The Siam Photon Source II (SPS-II) is Thailand's next-generation 3 GeV synchrotron light source currently under construction, comprising a 270 MeV linear accelerator, a 3 GeV booster synchrotron, a 3 GeV storage ring, and beamline facilities. Achieving the designed electron beam emittance below 1 nm·rad requires precise component placement and long-term positional stability, making a robust...
During the Long Shutdown 3 (LS3, from July 2026 to 2030), CERN surveyors will measure and re-align a large fraction of the 60 km accelerator beamline, requiring optimized survey procedures to ensure efficiency while maintaining accuracy and quality levels.
In preparation, CERN ‘s Geodetic Metrology group surveyed a 2.8 km Large Hadron Collider (LHC) arc during the 2024–2025 Year-End...
Future accelerators and fourth-generation storage-ring light sources impose increasingly stringent requirements for component positioning, stability, alignment, and uncertainty control.
Meeting these demands requires not only accurate instrumentation but also reliable and consistent measurement practices throughout the alignment chain.
To address these challenges collectively, an...
The Canadian Light Source has been operating its 2.9GeV storage ring since 2005. Beam-based metrics, primarily radio frequency tuning and orbit correction, provide a continuous, indirect measurement of the beam’s length and indicate a decrease in the storage ring beam circumference over time. The 171m storage ring is equipped with a 155-point wall and floor network to allow location of laser...
This study addresses the core problem of how to achieve high-precision measurement consistency in large-scale engineering metrology under high-noise and multi-disturbance environments.
First, for multi-station laser tracking systems, a GUM-based uncertainty propagation model is established, revealing the evolution laws of measurement accuracy and enabling accuracy optimization.
Second,...
The low-energy accelerator and experimental facilities at RAON are currently in operation following the completion of installation and initial alignment. Maintaining stable beam delivery requires periodic verification of beamline alignment accuracy relative to the facility's survey control network. This poster presents a geodetic alignment assessment of major RAON experimental beamlines,...
The SOLEIL II machine upgrade requires unprecedented alignment tolerances, down to +/- 20 µm for the most critical magnets of the storage ring. This specification demands full control of measurement uncertainties throughout the various steps of the alignment process. One of these steps is the survey, which aims to determine the position of the machine's components and thereby reconstruct its...
To satisfy the strict alignment tolerances of accelerator magnets for the Hefei Advanced Light Facility (HALF), it is essential to accurately fiducialize their magnetic centers. This paper describes a high-precision and efficient fiducialization method developed for HALF, based on a single stretched wire bench combined with a precision surface plate. The system enables the relative coordinates...
This paper presents an integrated three-component software suite developed at SLAC National Accelerator Laboratory for high-precision network measurement and adjustment in accelerator alignment. The system consists of AlignTrackPro for automated laser tracker data acquisition, a modernized version of the legacy LEGO adjustment engine, and LEGO Pipeline, which provides visualization through...
In preparation for the upcoming upgrade of the MAX IV Laboratory 3 GeV storage ring, tighter alignment tolerances are required for the magnet-cells to achieve the lower target beam emittance. We evaluate alignment strategies that ensure both local cell-to-cell smoothness and global alignment relative to the control network. Three candidate strategies are designed and evaluated using tailored...
Opening and reassembly are required in some accelerator magnet units during vacuum chamber installation, maintenance, or internal component adjustment. The reassembly state is commonly evaluated using high-precision top targets measured by laser tracker systems. This procedure provides a reliable engineering criterion for the recovery of the top-target region, but the targets are mainly...
Following previous IWAA presentations regarding progress on FAIR, this report outlines the status for 2025 and 2026. The campaigns over the last two years have included network measurements and their analysis, blue-lining in various machine areas, selective alignments to more complex structures in extremely hard-to-reach areas such as the Super-FRS, and the survey of parts of the machine that...
This poster presents the survey and alignment activities at the SLAC National Accelerator Laboratory since 2024. The major projects during the last two years have been the LCLSII-HE (Linac Coherent Light Source) project.
The LCLSII-HE project includes an additional 20 Cryomodule and an upgraded Soft X-Ray Undulator line. We re-mapped the existing monument network and monitored the effect of...
This project presents the integration of high-precision 3D scanning data
into the MAX IV spatial metrological network during the construction
of the new TomoWISE beamline.
By registering point cloud data within the facility global coordinate system,
the scanned data can be accurately overlaid with the beamline CAD model,
providing a reliable digital representation of the installation...
The Mu2e experiment at Fermilab will be 10,000 times more sensitive than previous experiments looking for muon-to-electron conversion. This precise and complex apparatus will be able to produce 200 million billion muons per year. The Mu2e experiment layout in the MC-2 Building consists of three superconducting solenoids magnets: Production Solenoid (PS), Transport Solenoid (TS), and Detector...
RAON requires a stable geodetic reference framework to support the precision alignment of accelerator beamlines and experimental devices. This work presents the maintenance of the RAON survey control network, including periodic measurements to evaluate floor monument stability and update alignment reference coordinates. As measurements must be completed within limited shutdown periods, recent...
Structured Laser Beams (SLBs) offer a viable alternative in generating straight reference lines for long-distance alignment systems in particle accelerators. While prior research has utilized quadrant detectors to demonstrate displacement sensitivity for various beam types, this study extends that evaluation to an optical system experimentally verified to diverge by only 0.1 mrad at a...
Achieving and maintaining the alignment tolerances required for the upgraded Advanced Photon Source (APS) is a significant challenge, particularly in the presence of ground motion and settlement. To monitor vertical displacement and transfer elevation over long distances, two hydrostatic leveling systems (HLSs) are being deployed at APS.
The storage ring system consists of 105 HLS sensors...
Since the launch of the Leica Absolute Tracker ATS800 mid of 2025 we have gained a lot of experience regarding customer applications through several demonstrations, benchmarks and test campaigns. These experiences have led to significant improvements in the handling of point clouds produced by the ATS800. The presentation will give an overview about the improvements prepared for an upcoming release.
Duke University Free Electron Laser Laboratory originally started at Stanford University in the Mid 1980's. The entire facility moved to Duke University in the late 1988.
In this presentation, methodology and technic of the survey and alignment of the beamlines in every step from start to present time will be discussed in detail.
The Advanced Photon Source (APS) Upgrade project received its final approval in January 2026, having delivered on its full scope on budget and ahead of schedule. The upgraded facility is now fully operational, and user experiments are underway. During the upgrade project the APS Survey and Alignment team also underwent a major transformation. Along with bringing on new technicians and...
The SOLEIL II machine upgrade requires unprecedented alignment tolerances, down to +/- 20 µm for the most critical magnets of the storage ring. This specification demands full control of measurement uncertainties during the different steps of the alignment process. For this specific purpose, a rigorous metrological approach has been developed and applied throughout the entire alignment...
In 2021 a preliminary design was proposed as the foundational metrology network for the forthcoming Scorpius linear particle accelerator. Located at the Nevada National Security Site’s (NNSS) Primary Underground Laboratory for Subcritical Experimentation (PULSE), the Scorpius metrology network spans a total area of approximately 838m2 and is 140m at its maximum length. Due to some unique...
The operational stability of large-scale particle accelerators—such as synchrotron light sources, and free-electron lasers—is fundamentally dependent on the sub-micron structural integrity and thermal stability of their components. However, the sprawling physical scale and extreme environments (high radiation, cryogenic temperatures, and electromagnetic interference) pose significant...
The 2028 installation phase of CERN's High-Luminosity Large Hadron Collider (HL-LHC) project will require precise positioning of hundreds of accelerator components and accompanying infrastructure within extremely tight integration tolerances. Floor tracing of reference marks is an important prerequisite for installation activities, providing the geometric references used by installation teams...
This study compares the vertical measurement accuracy of two Leica laser trackers: the AT500, which uses Orientation to Gravity (OTG), and the AT403, which provides continuous dual-axis compensation. Laboratory tests using a network of ten stations with a maximum baseline of 18 m showed that OTG correction produces vertical angle uncertainties of up to 0.4 arcsec, making single-instrument...
