Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 8: Myondetektoren I
T 8.5: Vortrag
Montag, 29. Februar 2016, 12:00–12:15, VMP6 HS E
Planarity Certification of ATLAS Micromegas Detector Panels — •Ralph Müller1, Otmar Biebel1, Jonathan Bortfeldt1, Bernhard Flierl1, Ralf Hertenberger1, Philipp Lösel1, Maximilian Herrmann1, and Andre Zibell2 — 1LMU München — 2JMU Würzburg
During the second long LHC shutdown, 2019/20, 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. A panel is composed of three consecutive layers FR4 - aluminum honeycomb - FR4.
Single plane spatial particle resolution below 100 µ m is achievable when
the deviations from planarity of the strip-anodes do 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 combined with a coordinate measurement system
have been investigated.
The sensor requirements to measure the planarity of the panels are a resolution of 0.3 µ m and
a beam spot diameter of ≈ 20 µ m, well below 100 µ m the
size of the smallest structures.
We report on achieved planarities of the panels and the performance of the laser sensor system. A panel with an RMS better than 30 µ m was build and the evolution of its planarity due to humidity and temperature effects is shown.