D. Attié, P. Colas, M. Lupberger, M. Riallot

LCTPC WP Phone meeting 109 July 15, 2010

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News from “Octopuce”News from “Octopuce”

•Gas: ArIso (95:5)

•VIngrids = 290 V ! (275 V before)

•Gain ~550

•Stable conditions (no spark) except hot spots (~8 nA)

•No trigger on cosmics

•Acquisition time: 0.5 s

•Efficiency to single e- 25 %

News data at higher gainNews data at higher gainNews data at higher gainNews data at higher gain

2July15, 2010 LCTPC WP phone meeting #109

•VIngrids = 290V up to 300 V

•Unstable conditions

Weak pointsWeak pointsWeak pointsWeak points

3July15, 2010 LCTPC WP phone meeting #109

•Are we ready to go to DESY?

•Any idea how to fix the weak spots?

•First, we can make a long run at VIngrids = 290V in Saclay to check the stability and robustness

•We could have a dedicated beam test of three days in October

Beam test in Large Prototype ?Beam test in Large Prototype ?Beam test in Large Prototype ?Beam test in Large Prototype ?

4July15, 2010 LCTPC WP phone meeting #109