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The preliminary results of MPGD-based TPC performance at KEK beam test

The preliminary results of MPGD-based TPC performance at KEK beam test. Yukihiro Kato Kinki University (ILC-TPC Collaboration). Motivation. Understand the basic performance of MPGD-based TPC.

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The preliminary results of MPGD-based TPC performance at KEK beam test

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  1. The preliminary results of MPGD-based TPC performance at KEK beam test Yukihiro Kato Kinki University (ILC-TPC Collaboration) 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  2. Motivation Understand the basic performance of MPGD-based TPC Comparison of several readout scheme (gas amplifiers) using same Field Cage, Electronics, analysis procedure, MWPC: beam test in Jun. 2004 GEM: beam test in Apr. 2005, Oct. 2005 MicroMEGAS: beam test in Jun. 2005, Oct 2005 Results are updated from ACFA05 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  3. ILC-TPC collaboration • Asia Japan (KEK, Saga, Tokyo A&M, Tsukuba, Kogakuin, Kinki, Hiroshima) Philippines (MSU-Iligan) • Europe Germany (DESY, MPI) France (CEA Saclay, LAL Orsay, IPN Orsay) • North America Canada (Carlton, Montreal) 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  4. KEK PS beam line π2 beam line: π+, π‐, p(P = 0.6～4 GeV/c) 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  5. π2 beam line 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  6. PC-MAG • known as JACCEE magnet for BESS-II • B field ：　1～1.2T@ center, No Return Yoke inner diameter: 850 mm, effective length: 1000 mm • Transported to DESY for EUDET at Dec. 2006 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  7. MP-TPC Field Cage Preamplifiers • Pad plane: effective area 75×75 mm2 • Maximal drift length: 260 mm • Detachable endplate MWPC and MPGD (GEM, MicroMEGAS) Readout plane 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  8. GEM(Gas Electron Multiplier) • Two copper foils separated by kapton (polymide), multiplication takes place in holes, uses 2 or stages for safer operation. • High electric field inside the holes • CERN GEM geometry • Copper electrodes (5μm thick) • Kapton insulator (50μm thick) • Bi-conical holes due to chemical etching • Hole size D ～ 60 μm, pitch p ～140μm • Using 3 stages induction gap: 1.0mm, transfer gap: 1.5mm 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  9. MicroMEGAS 50μm • Mesh size: 50μm • Micromesh sustained by 50 μm pillars, multiplication between anode and mesh, one stage • Self-suppression of positive ion feedback line of electric force pillar 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  10. Readout scheme and Gas • DAQ electronics: ALEPH TPC electronics ・ Charge sensitive pre-amp+shaper amp (500ns) ・ 8-bit FADC with 12.5MHz sampling rate • B field: 0, 0.5, 1.0 Tesla 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  11. Typical event(MicroMEGAS, B=0.5T) 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  12. Pad-response per region z = 0 mm MicroMEGAS, Ar-isobutane (5%), B=0.5T, E = 220 V/cm the avalanche charge spread for single electron z = 260 mm 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  13. Pad-response per region z = 0 mm z = 260 mm GEM, TDR, B = 1T, E = 100V/cm 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  14. Transverse diffusion properties preliminary result diffusion in readout MicroMEGAS 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  15. Transverse diffusion properties GEM B=1T TDR preliminary result P5 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  16. Spatial resolution vs. drift distance • CD : diffusion constant from data • σ0 : resolution without diffusion • Neff : effective number of electrons diffusion other effects 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  17. Spatial resolution MicroMEGAS preliminary result 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  18. Spatial resolution TDR Neff = 21.4±0.3 GEM preliminary result P5 Neff = 23.0±0.7 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  19. Analytic formula for spatial resolution [A] Finite pad pitch: rapidly disappears as z increases. N independent. [B] Diffusion, gas gain fluctuation, finite pad pitch term: scales as 1/Neff, for δ function like PRF asymptotically: [C] Electronic noise: z independent 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  20. Comparison with measurements Formulation can explain the MicroMEGAS data. 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  21. diffusion and resolution preliminary results B = 1T data 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  22. Summary • The values of diffusion constant (CD) are consistent with Magboltz simulation. • In the case of MicroMEGAS, σPR0 has a large error. It is much smaller than the pad pitch. Need to spread the avalanche size by resistive foil, etc. • Spatial resolution can be described with the simple analytic formula. 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  23. Backup slide 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  24. K.Fujii 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  25. K.Fujii 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

  26. K.Fujii 9th ACFA ILC Physics and Detector Workshop & ILC GDE Meeting

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