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東京大学におけるＭＳＧＣの開発

東京大学におけるＭＳＧＣの開発. 東京大学 二河久子 niko@sophie.q.t.u-tokyo.ac.jp 藤田薫、高田夕佳、高橋浩之. 2007/01/27 MPGD@ 佐賀大学. Outline. Introduction 1) Global-Local Grouping 1-Dimensional MSGC 2) Global-Local Grouping 2-Dimensional MSGC 3) Fine-pitch MSGC Conclusions. Introduction.

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東京大学におけるＭＳＧＣの開発

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  1. 東京大学におけるＭＳＧＣの開発 東京大学 二河久子 niko@sophie.q.t.u-tokyo.ac.jp 藤田薫、高田夕佳、高橋浩之 2007/01/27 MPGD@佐賀大学

  2. Outline Introduction 1) Global-Local Grouping 1-Dimensional MSGC 2) Global-Local Grouping 2-Dimensional MSGC 3) Fine-pitch MSGC Conclusions

  3. Introduction Multi-grid-type MSGC(M-MSGC) is being developed for • 1)Large sensitive area (1~1.5m2)@low cost • 2)High position resolution @low cost ~0.6mm for normal size: 10cm2 1.5mm~2mm for large area, ~0.6mm • 3)High counting rate ~20kHz/module, ~1MHz possible with 4 anode readout Why MSGC? - Uniformity of plate pattern = realize uniform gas gain - Low cost - We can develop MSGC design and its plate by ourselves with Electron Beam lithography (ADVANTEST F5112) at our univ. 1)&2): especially for Neutron scattering experiment (it needs quantitative data : detection of the position)

  4. 0) Multi-grid type MSGC anode strip grid electrode G4 G3 C G2 G1 400mm A Cathode strip M-MSGC Multi Wire Proportional counter Microfablication technology photolithography EB lithography MSGC Narrow pitch of electrodes ⇒High-counting Rate 100 ~ 400 mm Anode pitch ⇒High position resolution MSGC Problem Discharges due to surface streamers favorable electric field with intermediate grid electrodes M-MSGC

  5. 1)Global-Local Grouping 1-Dimensional MSGC 700mm For Large sensitive 2 designs are arranged on one plate. M-MSGC:Original design The longest MSGC: 64cm Global Local Method High position resolution 1-3mm FWHM Low cost Signals are read from cathodes： no necessity of decoupling condensers

  6. 1)Global-Local Grouping 1-Dimensional MSGC Conventional M-MSGC Local Anode Global Conceptual drawing:top view What is Global-Local Grouping Method? (top view) ⇒Position = Global:2 and Local1

  7. 1)Global-Local Grouping 1-Dimensional MSGC Cathode Anode L L’ + Local “Position resolution” and “Signal to noise ratio” Conventional type L Position resolution Signal to Noise ratio L/40 40 20 L/20 with GLG method Cathode Local L/400 20 Cathode Global L S/N worsens, but L becomes smaller!!

  8. 1)Global-Local Grouping 1-Dimensional MSGC Comparison of GLG and usual charge division Advantage of use GLG For total length 640mm Position resolution (mm) Simple Charge division 10mm GLG method 1mm １０ １００ Signal to Noise ratio

  9. 1)Global-Local Grouping 1-Dimensional MSGC 14 keV X-rays @KEK PF Ar(70%)+CH4(30%)＠１atm Gas gain3500 Position resolution for 14 keV X-rays FWHM：　Global: 13mm, Local: 1.6mm

  10. 1)Global-Local Grouping 1-Dimensional MSGC Beam Scan Results for 32cm along Gas gain 4000

  11. 1)Global-Local Grouping 1-Dimensional MSGC X-ray Beam scan result

  12. 2) Global-Local Grouping 2-Dimensional MSGC For High position resolution Multi layer 64mm2 0.8mm pitch Position resolution：0.8mm Split anode and GLG Method for cathode simpler electronics (1/5)： Read out :36 channels + amps ⇒0.8mm pitch, 2D individual readout (usually as the same design,160 channels + amps are needed for individual readout) Concept & Design :University of Tokyo Plate manufacture : TOSHIBA

  13. 2) Global-Local Grouping 2-Dimensional MSGC Quick reports with test plate (G2 and G4 are open.) Bias Voltage: anode@630V G1 and G2@280V G3 and G4@45V Source: Sr-90

  14. 2) Global-Local Grouping 2-Dimensional MSGC X-ray Beam scan result (anode) Position resolution ~0.8mm Global position Local position

  15. 3) Fine-pitch MSGC For High Counting Rate Previous work (i) Dynamic range measured in a charge-integrating mode Gas Gain: 100 Linear response　～ 108 cps/mm2

  16. 3) Fine-pitch MSGC Previous work (ii) Dynamic range measurement using a beam parallel to anode strip For higher counting rate, fine-pitch M-MSGC is considered Gas Gain: 100 Linear response　～ 1011 cps/mm2 3 digits improved

  17. 3) Fine-pitch MSGC radiation radiation Charge Charge Towards Fine-pitch M-MSGC Fine pitch MSGC can enhance the counting rate characteristics Fine pitch Coarse pitch Anode Anode cathode Glass substrate Glass substrate side view Plate without grids Design : Fine-pitch<Electron mean pass in gas 300~400mm

  18. 3) Fine-pitch MSGC Anode Grid1 Grid 2 Cathode 50 um 50 um pitch : Nano strip Gas Counter (NSGC） Metal Chromium Anode pitch 50 um Anode width 800 nm Gap Anode-Grid 6um others5 um Effective area 2mm x 20 mm Gaps 6,5,5,5,6,=32 Width 3,3,5,2,3,3=18

  19. 3) Fine-pitch MSGC Charge-sensitive preamplifier output signal Amplitude[a.u.] Time[sec] Measured using 16 CH Preamp U-Tokyo ASIC

  20. 3) Fine-pitch MSGC Anode Amplitude[a.u.] 1msec Cathode Time[sec]

  21. 3) Fine-pitch MSGC Pulse height spectrum for 8keV X-rays 8 keV X-rays φ100 mm @KEK PF Ar(70%)+CH4(30%)＠１atm Gas gain280 Counts/Channel FWHM 15% Ar escape peak Channel number

  22. Conclusions 1) Global-Local Grouping 1-Dimensional MSGC Confirmed basic characteristics.Next step, build up several plates array alignment. 2) Global-Local Grouping 2-Dimensional MSGC Under manufacturing of the Plate… 3) Fine-pitch MSGC We have made a very fine-pitch M-MSGC as the first trial of nano-strip gas counter Fabricated detector was successfully operated at a gas gain 280

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