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T: Fachverband Teilchenphysik
T 29: TPC und Micromegas
T 29.7: Vortrag
Montag, 9. März 2015, 18:15–18:30, I.12.02 (HS 31)
Performance of Laser Distance Sensors for Atlas Micromegas Production — •Ralph Müller1, Otmar Biebel1, Jonathan Bortfeldt1, Bernhard Flierl1, Ralf Hertenberger1, Philipp Lösel1, Elias Pree1, and Andre Zibell2 — 1LMU München — 2JMU Würzburg
During the second long LHC shutdown, 2018/19, the precision tracking
detectors of the ATLAS muon spectrometer in the inner end caps
will be replaced using Micromegas, a planar gas-detector technology.
Modules of 2 m2 area are built in quadruplets
from five precisely planar sandwich panels that define the anodes and the cathodes of the
four active detector planes.
Single plane spatial resolutions below 100 µ m are achievable when
the deviation from planarity of the strip-anodes does not exceed
80 µ m RMS over the whole active area and
the parallelism of the readout strips is within 30 µ m.
In order to measure the dimensional accuracy of each panel,
laser distance sensors to be combined with a coordinate measurement system
have been investigated.
One of them turned out to be capable to measure the planarity of the panels.
It has a resolution of 0.3 µ m and
a beam spot diameter of ≈ 50 µ m, which is well below 100 µ m the
size of the smallest structures.
For monitoring purposes during the construction process a less accurate
but cheaper sensor turned out to be sufficient.
We report on the performance of the sensors and their applicability
to our tasks.