First operation of GridPix in double phase Liquid Argon Patrick Decowski Gijs Hemink Mattheo Alfonsi Rolf Schon Niels van Bakel Maarten van Dijk Harry.

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Presentation transcript:

First operation of GridPix in double phase Liquid Argon Patrick Decowski Gijs Hemink Mattheo Alfonsi Rolf Schon Niels van Bakel Maarten van Dijk Harry van der Graaf Nikhef, Amsterdam 6 th Workshop RD-51, Bari, Oct 8, 2010

4th RD51 Collaboration Meeting - Maarten van Dijk WIMP search, bi-phase Xenon GridPix TPC as WIMP / DBD detector Source: Direct Searches for Dark Matter, Elena Aprile, EPS - HEP, July , Krakow, Poland

XENON DARWIN: European R&D project for bi-phase missing mass/energy detectors With InGrid TPC: - detection of single, individual electrons essential: granularity and the very small source capacitance at pixel input - high (95 %) single electron efficiency - accurate X, Y and Z (timing) precision - potentially: (UV) photon detector With GridPix, a detector is superimposed onto the (PM/QPID) detection system

4th RD51 Collaboration Meeting - Maarten van Dijk Gridpix in Xenon: Test setup Collaboration DARWIN/XENON Columbia Univ., N.Y.

55Fe in pure argon, HVgrid = 350 V P = 1 bar T = -70 C at NLR cryostat gain: ~ 200 !

- TimePix chip: proved to work at – 100 C - confirmed – 83 C in our work - Would TimePix work at -160 C (LAr temperature?) - Gas gain in pure Ar, pure Xe: measured G = ~ 200. Purity? - Special pixel chip (TPX-?) may have noise < 20 e- - Discharge stability: influence protection layer? UV photon propagation? - Required HV: 350 V. Steep gain/HV relation. Pure Ar proportinal wire tube: 600 V! - Max reachable gain with Micromegas versus single GEM

4th RD51 Collaboration Meeting - Maarten van Dijk Expanding GridPix? Photoelectric effect Future possibility: CsI layer on grid