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Screen printing MM test,current status and plans
Atsuhiko OchiKobe University
6, November 2012 ATLAS MicroMEGAS meeting
Screen printing – MM has already been assembled with gas package.◦ Readout : 1-Dimensional, 400um pitch◦ Gas gap : ~ 100 um (estimated)◦ Drift length : ~ 1cm
Operation test◦ Gas: Ar:C2H6 (7:3)◦ Signal of beta source (90Sr) were observed◦ No HV current found (<10nA)
At first, in the burn-in stage, we found steady current of a few micro ampere.
◦ Estimated gain … a few thousand Vstrip = +520V, Vdrift = -1kV
◦ We need to reduce the nise.
2012/11/6A. Ochi, Kobe Univ. 2
Status of chamber preparation
Site of the test◦ H6 test bench, using parasite beam
Schedule◦ Because of administration work, we will be ready to enter the test
beam site from 14th November.◦ We will check position/timing resolution for various voltages of strips
and drift plane. We will take a data for comparing to existing MMs.
◦ Estimated test term is one week Maximum, 2 weeks.
◦ Ochi and Edo will join from Kobe.◦ We need helps from test beam experts.
Materials to be need◦ Readout: Two APV25 cards and their readout system◦ HV supplies (Positive and Negative)◦ Gas system
2012/11/6A. Ochi, Kobe Univ. 3
Test plan at CERN