University College London (UCL) has provided seed funding to UCL’s 3DIMPact group for the development of a prototype website which will support the development of portable 3D metrology and related technologies. For the first time this will provide a consolidated, structured resource offering knowledge transfer in these fields.
The website will provide three key elements to achieve this...
The Virgo detector, currently in its 2nd generation configuration “Advanced Virgo”, is a Michelson interferometer aimed at the gravitational waves research and at opening a new window on the study of the Universe. It is made of two orthogonal arms being each 3 kilometers long and is located at the site of the European Gravitational Observatory (EGO), in the countryside near Pisa, Italy.
This...
In the CNAO accelerator for adrontherapy, a new experimental line and a dedicated hall have been added. The main accelerator hall and the experimental hall are separated by a 2 m thickness concrete wall. The only communication between the two hall is a 20 cm hole, normally closed by a concrete plug.
The alignment network of the main hall has to be connected to a new network in the...
An auto-tuning girder system for the Taiwan Light Source(TPS) storage ring had been designed and established to align the girders quickly also precisely with only few manpower. During the installation period, with the survey network data from the lasertrackers, this girder system demonstrated the ability and met the design requirements. Including the testing run, with only 4 times tuning, the...
This presentation outlines some facets of the new Muon Campus under development at Fermilab. Over the next years two experiments utilizing Muons will test the limits of the Standard Model of Particle Physics. The g-2 experiment tries to improve the accuracy of the measured magnetic momentum of Muons, while the Mu2e experiment is searching for Muon–to–Electron conversions predicted by some...
The Advanced Photon Source (APS) at Argonne National Laboratory is a 7GeV third generation light source providing X-ray beams for research to scientific community since 1995. In order to remain the world-leading synchrotron radiation facility in the western hemisphere, delivering X-ray beams of high-brightness and high-energy is critical. In 2013, the Department of Energy (DOE) identified the...
The Virgo detector, currently in its 2nd generation configuration “Advanced Virgo”, is a Michelson interferometer aimed at the gravitational waves research and at opening a new window on the study of the Universe. It is made of two orthogonal arms being each 3 kilometers long and is located at the site of the European Gravitational Observatory (EGO), in the countryside near Pisa, Italy.
Over...
As part of the recently completed LUMINAR project, lead by the UK’s National Physical Laboratory (NPL), the 3DIMPact group at University College London (UCL) was given the task of evaluating and correcting the effects of refraction on photogrammetric metrology applications.
Refraction causes light rays to bend. This results in pointing errors which potentially can be corrected. Simulations...
The Taiwan Light Source(TPS) storage ring has a circumference of 518.4m. The devices are aligned alonge the storage ring with the relative accuracy of ±0.2mm. The Insertion Device(ID) needs higher relative accuracy of ±0.05mm to adjacent magnets in the local area. In order to evaluate the reliability performance of the Laser Tracker we test a series of the stability experiments. The first was...
In the SPARC accelerator the electron beam and the laser beam crosses at an interaction point of really small size. So both the beams has to be precisely and mutually aligned.
As for the laser, scientists use to make manual alignment by means of mirrors and irises, using a low power pointing laser. This is definetely unpractical in the accelerator environment, where the access is forbidden...
Only in recent years of SLS operation the potential of the HLS system with 192 Levelsensors has been fully exploited. A vertical realignment campaign as part of the quest to realize a very small vertical emittance of 1 pm.rad led to an increased interest in the HLS system in 2011. Electron beam-based measurements, alignment survey data and HLS data were compared and found to be consistent over...
Proton Improvement Plan-II (PIP-II) is Fermilab’s plan for upgrading the accelerator complex with the goal of providing proton beam power of 1.2 MW on target at the start of operations of the Long Baseline Neutrino Facility (LBNF). It will also create a platform for long term development to multi MW capabilities to support a broader Fermilab research program.
This paper summarizes the...
Standard 3D measurements showed that it is difficult to align accurately the components of a particle accelerator in a narrow and straight tunnel due to the configuration of the network. When one makes use of a total station or a laser tracker for example, the radial alignment of the components diverges quickly if conventional alignment methods are used.
We propose to add measurements w.r.t...
The EVB2 Magnet is a large vertical bending magnet located in the extraction line of the ISIS synchrotron.
The magnet is over 25 years old and increasingly unreliable.
Therefore a project was initiated to replace the EVB2 magnet; ISIS Survey Section was tasked with pre-aligning this replacement.
The existing magnet was aligned during the construction of the synchrotron, using...
Laser tracking measurement system is widely used in large-scale and high-precision measurement in the fields of particle accelerator positioning, automobile assembly, ship-building and other manufacturing. It obtain 3D coordinates of measured object by measuring the distance from the object to the origin of machine coordinate system as well as the horizontal and vertical angles of object....
Direct measurements through glass windows with a Laser Tracker onto reflectors installed within a cryostat are not readily possible. Nevertheless these kind of measurements were investigated to accomplish the given requirements.
The high precise monitoring requirements regarding deformations of the cold mass along with movements vs. cryostat of superconducting components in 3D were initially...
In this presentation we address the problem of precisely aligning 140 two-ton integrated magnet-packets at MAX IV Laboratory. We present the methods and techniques we have used to align these packets with a 6-DOF kinematic arrangement in order to increase precision and to get rid of the stresses induced by the fabrication imperfections and the thermal expansion. The 6-DOF aligning mechanisms...
During a network measurement campaign 2015 the Leica laser tracker AT402 was considered and applied as a centred instrument. Therefore a methodology was developed to use it in such a way.
One aim was to analyse the precision of the centring of this instrument. Another task was the analysis how this method of reciprocal observations influenced the evaluation and especially the adjustment of...
IHEP are taking effort to design the ADS (Accelerator Driven Sub-critical System) injector-I. In order to gain enough experience, a test cryomodule is designed to do all the relevant system joint test. The working temperature is 4K, because the cold mass contraction, it is a great challenge to preserve the alignment precision after such a big range temperature drop. So wire position...
We did some investigations for optimizing our measurement processes. Main points are time saving, error avoidance and quality assurance. The poster shows very different spots of finished and current projects e.g. simultaneously measurements with two laser trackers, using barcodes for point ID encoding, an approach using a Leica AT402 in geodetic network measurements as a centered measurement...
Up to now the linear accelerator (Linac) alignment at SLAC was based on fiducials on the girders of the Linac. These were directly tied to the Linac Laser Alignment System which had a target at every subsector (270 targets for the 3048m length). For the new LCLS II a superconducting Linac will be installed in the first third of the accelerator housing and the Linac light pipe will be removed...
This poster presents the survey and alignment activities at the SLAC National Accelerator Laboratory since 2014. The major projects during the last two years have been a revised coordinate system for the SPEAR3 ring, changing the monumentation in the SLAC Linac from a girder based system to a monument based system and the reconfiguration of the Linac Laser Alignment System in preparation for...
The Straight Line Reference Surveyor is getting installed and comissioned.
The synchrotron Light Source for Experimental Science and Applications in the Middle East (SESAME) is now in its final stage. This paper also presents the alignment strategy for the storage ring of SESAME.
The over 30 years old GANIL laboratory (heavy ions national accelerator) is still delivering beams that interest the nuclear physicist community. That is why AGATA (Advanced GAmma Tracking Array, a European collaboration of 12 countries) settled at GANIL for a 4 years campaign. This ¼ π gamma-ray detector requested a quite strong effort in term of 3D positioning metrology and in term of...
The Advanced Photon Source linear accelerator system utilizes 3-meter long SLAC-type 2856 MHz accelerating structures. Surveys of the APS LINAC indicated distortion in the straightness of the accelerating structures over time, with 7 mm of sag detected in the worst case. A long-term project to straighten the accelerating structures, swapping them out one-by-one and straightening those removed,...
The NOvA experiment is looking to answer fundamental questions about neutrinos and the role they play in the universe. NOvA currently uses two detectors, the near detector located underground at Fermilab and the far detector located 810 km from Fermilab on the US-Canada border in Ash River, Minnesota. The 15 kTon far detector and the 222 ton near detector are composed of several cells of...
Preferably the magnetic center of a magnet is the one to be referred during alignment. This requires cooperation between magnetic measurement and survey group so that the difference between magnetic and mechanical center is taken into account. By establishing local frame of magnetic measurement equipment initially and then aligning magnet or insertion device precisely relative to it, the...
Smoothing technique based on best-fit transformation is further developed during the running of NSLS-II, which is the only way to avoid the conflict between the requirement of good alignment quality and an minimum interruption of the running of beam lines.
Local deviations are generated as a first step for each interested components to avoid the approximation error caused by longitudinal...
This report presents the status alignment of DTL(drift tube linac) at CSNS（China Spallation Neutron Source）.The DTL for CSNS consists of 12 tanks. A unit tank was made up of 3 tanks. The fiducialization of cavity and drift tube of the DTL had already been accomplished.The total of 153 drift tubes had been installed and aligned precisely in the DTL tank. The fisrt and second unit tank had...
TSUNAMI, The Survey Unified Notepad for Alignment and Measurement Interventions is a new software designed to replace two existing software, mainly dedicated to data acquisition and beam component alignment using geodetic instruments at CERN. The use of different programs has been justified historically by the different needs, equipment and types of user. The two main ones have been written...
The High Luminosity LHC (HL-LHC) project aims at upgrading the long straight sections of the LHC on each side of the two main LHC experiments, ATLAS and CMS. One of the innovative key technology is the superconducting cavities for beam rotation. These “crab cavities” are working in vacuum and cryogenic environment under radiation conditions. An alignment of the inner tank of the crab cavities...
