1 / 26

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.

shiela
Télécharger la présentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related