TPC chamber for Medipix2/TimePix David Attié, Paul Colas, Marc Riallot SiTPC brainstorming, Bonn – 27 March 2007 David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
+ Medipix2/TimePix Micromegas Mini-chamber Summary + Medipix2/TimePix Micromegas no ExB effect good for 2-track separation high gain very fast electron signal on the anode plane small ion feedback in the drift space robust and easy to implement only one power supply is needed 55 mm pixels Direct X-ray conversion Low noise 14-bit counter per pixel Mini-chamber SiTPC endplate + Large Prototype For ILC David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
SiTPC brainstorming, Bonn – March 27, 2007 First step First test of a Medipix2 + Micromegas in the gas Improve the gas mixture (“non-sparking” operation) Medipix2 TimePix readout chip LP endplate Metallic box of 24 cm x 14 cm x 6 cm size David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
TPC chamber for the Medipix2/TimePix chip David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
TPC chamber for the Medipix2/TimePix chip Windows for X-rays soure Box Windows for b source Drift frame Field cage Micromegas mesh frame Mesh frame support Flat seal Medipix2/TimePix readout bord HV connectors David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
SiTPC brainstorming, Bonn – March 27, 2007 Kapton for drift cage David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
Kapton for drift cage + drift frame David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
Mesh for TimePix TPC chamber 1 pillar every ~mm with a multiple of 55 um pitch ~ 0.5 mm lost at the photoresist edge David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
SiTPC brainstorming, Bonn – March 27, 2007 Mesh frame David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
SiTPC brainstorming, Bonn – March 27, 2007 Mesh frame support David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007
SiTPC brainstorming, Bonn – March 27, 2007 Status and prospects Design is finished and sent to the factory, expected at the end of april First tests in two months using: Medipix2 with Ingrid or not TimePix protected or not cosmic-rays tests x-ray and b sources tests Time and TOT mode Ionization measurements: single photon counting, … Polarimetry detector capacity David.Attie@cea.fr SiTPC brainstorming, Bonn – March 27, 2007