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First TimePix tests at CERN

First TimePix tests at CERN. David Attié ECFA Meeting – Valencia – 8 November 2006. Introduction. TimePix Proposal: November 2004 develop produce Medipix2  TimePix test. TimePix test at CERN ~ November 2006. Medipix2. TimePix. TimePix measurements.

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First TimePix tests at CERN

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  1. First TimePix tests at CERN David Attié ECFA Meeting – Valencia – 8 November 2006 ECFA Meeting, Valencia – November 8, 2006

  2. Introduction • TimePix Proposal: November 2004 • develop • produce Medipix2  TimePix • test • TimePix test at CERN ~ November 2006 Medipix2 TimePix ECFA Meeting, Valencia – November 8, 2006

  3. TimePix measurements • Chip design was submitted to foundry on the beginning of July • 12 wafers arrived at CERN 2nd week of September • Modifications in the Medipix readout system (~1 week): • “Timepix-Medisoft” version of the software • MUROS2 firmware updated (thanks to Hans Verkoojen, Nikhef) • Preliminary TimePix characterization has been done on-wafer • using the Medipix2 probing card in the DSF clean room facility at CERN ECFA Meeting, Valencia – November 8, 2006

  4. Test procedures for TimePix * Alignment monitor (moving platform + microscope) to position the chip * Readout using probing bench + MUROS2 * Check the current supply (~200 mA/chip) and ID chip • * Software used : Medisoft 4.x • Analogic tests (ANIN) • TOT mode • MEDIPIX mode • Digital tests using calibration of DACs  Classification (A, B, C, …) ECFA Meeting, Valencia – November 8, 2006

  5. Test procedures for TimePix * Alignment monitor (moving platform + microscope) to position the chip * Readout using probing card of Medipix2 + MUROS2 * Check the current supply (~200 mA/chip) and ID chip • * Software used : Medisoft 4.x • Analogic tests (ANIN) • TOT mode • MEDIPIX mode • Digital tests using calibration of DACs  Classification (A, B, C, …) ECFA Meeting, Valencia – November 8, 2006

  6. Pixel measurement • From 2 special pixels at the bottom of the matrix • we can measure: • preampOut • discOut • internal Ref_Clk • counter clock • State Machine of • the counter Modes (P0, P1) • Medipix (0, 0) • TOT (0, 1) • TimePix-1hit (1, 0) • TimePix (1, 1) • work as expected in simulations • No visible coupling of • the Ref_Clk signal • into the analog signals • (preampOut and discOut) TOT mode (P0=1; P1=0) TimePix mode (P0=1; P1=0) TimePix-1hit mode (P0=0; P1=1) ―Shutter ―PreampOut ―Thr ―discOut ―CounterClk ECFA Meeting, Valencia – November 8, 2006

  7. TimePix DACs • Some DACs show a non-monotonic curve • Non- Monotonic DACs are: • Preamp • Disc • BufferA • BufferB • Problem may be related • to the latching of the DACs register • The midrange value (code 01111111=127) • is always stable (1 complete wafer) • These DACs are unchanged • under normal operating conditions ECFA Meeting, Valencia – November 8, 2006

  8. TimePix chip classification 14 mm • Classification of a tested chip: • Class A: no dead column • Class B: 1 dead column • Class C: 2 dead columns • Class D: more than 2 dead columns • Class E: bad DACs • Class F: bad digital test, no communication, etc… •  dead chip ECFA Meeting, Valencia – November 8, 2006

  9. First TimePix test Wafer #14: A5FWQTX Tested by Xavier Llopart (CERN) ECFA Meeting, Valencia – November 8, 2006

  10. First TimePix test Wafer #15: AQFWTPX Tested by: - David Attié (CEA/Saclay) - Uwe Renz (Freiburg) ECFA Meeting, Valencia – November 8, 2006

  11. Future development + Medipix2/TimePix Micromegas • no ExB effect • good for 2-track separation • high gain • very fast electron signal on the • anode plane • very small ion feedback in the • space cheap • robust and easy to implement • 55 mm pixels • Direct X-ray conversion • selection of window in energy • 13-bit counter per pixel Mini-chamber SiTPC endplate+Large Prototype ECFA Meeting, Valencia – November 8, 2006

  12. Next steps • First test of a Medipix2 + Micromegas in the gas • Improve the gas mixture (“non-sparking” state) • Medipix2  TimePix readout chip  LP endplate M. RIALLOT (DAPNIA/SEDI) ECFA Meeting, Valencia – November 8, 2006

  13. Box design Metallic box of 24 cm x 14 cm x 6 cm size M. RIALLOT (DAPNIA/SEDI) ECFA Meeting, Valencia – November 8, 2006

  14. Mini-chamber for the Medipix2/TimePix chip Design plan: Windows for X-rays source Box 2.5 cm 6 cm Windows for b source Field cage Micromegas mesh M. RIALLOT (DAPNIA/SEDI) Medipix2 readout chip ECFA Meeting, Valencia – November 8, 2006

  15. Conclusions * 2 wafers and half have been tested at CERN * ~ 50 % of class A ~ 20 % of class B ~ 30 % of class C/D/E/F * Test to be continued in the next weeks * First test beam in DESY right now with Medipix/TimePix * CEA/Nikhef: test in gas chamber in the next months with Medipix/TimePix NIKHEFMaximilien Chefdeville, Martin Fransen, Harry van der Graaf, Jan Timmermans, Jan Visschers CEA/Saclay/David Attié, Dan Burke DAPNIAPaul Colas, Arnoud Giganon, Yannis Giomataris Univ. Twente/Jurriaan Schmitz, Cora Salm, Mesa+Victor Blanco Carballo, Sander Smits CERNMichael Campbell, Erik Heine Xavi Llopart Thanks to: Wim Gotink Joop Rovenkamp Marc Riallot ECFA Meeting, Valencia – November 8, 2006

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