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Design and Construction of Large Size Micromegas Chambers for the ATLAS Upgrade of the Muon Spectrometer
- Source :
- IEEE Trans.Nucl.Sci., IEEE Trans.Nucl.Sci., 2016, 63 (4), pp.2336-2342. ⟨10.1109/TNS.2016.2590601⟩, IEEE Transactions on Nuclear Science, IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2016, 63 (4), pp.2336-2342. ⟨10.1109/TNS.2016.2590601⟩
- Publication Year :
- 2015
-
Abstract
- Large area Micromegas detectors will be employed for the first time in high-energy physics experiments. A total surface of about 150 m2 of the forward regions of the Muon Spectrometer of the ATLAS detector at LHC will be equipped with 8-layer Micromegas modules. Each module extends over a surface from 2 to 3 m2 for a total active area of 1200 m2. Together with the small strip Thin Gap Chambers they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS endcap muon tracking system in the 2018/19 shutdown. In order to achieve a 15% transverse momentum resolution for 1 TeV muons, in addition to an excellent intrinsic resolution, the mechanical precision of each plane of the assembled module must be as good as 30 μm along the precision coordinate and 80 μm perpendicular to the chamber. In the prototyping towards the final configuration two similar quadruplets with dimensions 1.2×0.5 m2 have been built with the same structure as foreseen for the NSW upgrade. It represents the first example of a Micromegas quadruplet ever built, realized using the resistive-strip technology and decoupling the amplification mesh from the readout structure. All readout planes are segmented into strips with a pitch of 400 μm for a total of 4096 strips. In two of the four planes the strips are inclined by 1.5o and provide a measurement of the second coordinate. The design and construction procedure of the Micromegas modules will be presented, as well as the design for the assembly of modules onto the New Small Wheel. Emphasis will be given on the methods developed to achieve the challenging mechanical precision. Measurements of deformation on chamber prototypes as a function of thermal gradients, gas over-pressure and internal stress (mesh tension and module fixation on supports) will be also shown in comparison to simulation. These tests were essential in the development of the final design in order to minimize the effects of deformations. During installation and operation all deformations and relative misalignments will be monitored through an optical alignment system and compensated in the tracking software. The optical alignment concept will also be outlined.
- Subjects :
- Physics::Instrumentation and Detectors
HE Physics
Tracking (particle physics)
01 natural sciences
law.invention
high-energy physics experiment
law
Wheels
Strips
ATLAS upgrade
momentum resolution
optical alignment
mechanical precision
particle tracks
micromegas chamber construction
Physics
Large Hadron Collider
Mesons
Detector
MicroMegas detector
Detectors
NSW
tracking software
spectrometer: upgrade
micromegas chamber design
medicine.anatomical_structure
mechanical engineering
8-layer micromegas module
mesh tension
strip thin gap chamber
Atlas
LHC
Micromegas
Particle Physics - Experiment
muon tracking
Coordinate measuring machines
Nuclear and High Energy Physics
STRIPS
fabrication
innermost station
pseudorapidity coverage
particle spectrometers
Nuclear physics
thermal gradient function
Optics
Atlas (anatomy)
position resolution
Muon spectrometer
0103 physical sciences
medicine
[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Electrical and Electronic Engineering
010306 general physics
numerical calculations
Spatial resolution
Muon
010308 nuclear & particles physics
business.industry
deformation
Order (ring theory)
position sensitive particle detectors
muon detection
micromegas detector
Nuclear Energy and Engineering
MPGD (Micropattern Gaseous detector)
business
muon: spectrometer
Subjects
Details
- Language :
- English
- ISSN :
- 00189499
- Database :
- OpenAIRE
- Journal :
- IEEE Trans.Nucl.Sci., IEEE Trans.Nucl.Sci., 2016, 63 (4), pp.2336-2342. ⟨10.1109/TNS.2016.2590601⟩, IEEE Transactions on Nuclear Science, IEEE Transactions on Nuclear Science, Institute of Electrical and Electronics Engineers, 2016, 63 (4), pp.2336-2342. ⟨10.1109/TNS.2016.2590601⟩
- Accession number :
- edsair.doi.dedup.....85fc7712bd80300b06c0c52819f314aa