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Present Status of GEM Detector Development for Position Counter
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Present Status of GEM Detector Development for Position Counter

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  1. Present Status of GEM Detector Development for Position Counter Introduction GEM Readout Board Fabrication Test Large GEM Readout Electronics Summary Kunihiro Fujita Research Center for Nuclear Physics, Osaka University

  2. trigger tracking Sci 2 Sci 1 position 2 charged particle position 1 GEM detector Introduction • Application to Nuclear Physics Experiment • Coherent Pion Production • Requirements • high position resolution (< 100um) • radiation tolerance (> 1Mcps) • Concept • GEM • Readout Board with Micro Pattern Strips overview of the detector system

  3. E aramid carbon (6μm) 100mm Drift (3 kV/cm) GEM 1 ΔV ~400V GEM 2 GEM 3 140μm Readout Board (GND) GEM • Fabrication procedure • Wet etching (supplied by CERN) ⇒ high quality and low cost ~ 700,000yen/10sheet • Plasma etching ( by Fuchigami Micro Co., Ltd.) ⇒ large size is difficult • Laser etching ( by Fuchigami Micro Co., Ltd.) ⇒ larger size needs higher cost ~ 3,700,000yen/20sheet lowest cost and stable operation ⇒ We decide to use CERN-GEM

  4. 100mm 100mm Kapton (50um) Cu (4um) 80um Flexible Printed Circuit 340um 500 channel Cu (4um) 400um G10 (100um) Readout Board (ROB) • Readout Board • high position resolution • 2 dimensional readout • components • double layers of perpendicular copper strips • fabrication procedure • close to one of used for GEM • wet etching ~ Raytech, CERN • laser etching ~ Raytech prototype electron microscope image and schematic image

  5. Fabrication procedure of ROB • Raytech • Wet etching • Laser etching • CERN • Cost • 1,000,000/3sheet • Problem • Over etching • Mountain shape • only 50um kapton

  6. Fabrication test • Components • 3GEM electrode • 128ch bundled Micro Strip • test procedure • 55Fe source • Charge amp. → Camac ADC • calibration for gain • result is consistent with CERN & CNS prototype chamber the measured amplification factor in each gas. [1] S. Bachmann et al., NIM A 438 (1999) 376. [2] M. Inuzuka et al., NIM A 525 (2004) 529. pulse height distribution.

  7. soldering pattern 1 pattern 2 pattern 3 divide H.V. GEM holes (standard) triangular pattern size: 70um pitch: 140um 200um separation cross section Large Size GEM • Active area • 307.2x 50.2 mm2 • What should be solved • discharge propagation • over 80cm2 • H.V. terminal • Solution • 2-segmented • protection resistance • 3 patterns of H.V. terminal 50.2 307.2 10M discharge signals on anodes S. Bachmann et al., NIMA 479(2002)294

  8. Analog-LSI Connection Readout Board half-pitch connector • Propose • charge transfer from ROB to Readout electronics • Components • Flexible Printed Circuit Board • its connector • Advantages • low noise transfer • wire bonding less FPC connector Readout Electronics FPC Front-end Card

  9. high speed data taking ADCs for each channel? Computer GEM detector analog digital digital radiation hard environment Development of Readout System • Requirements • huge number of readout channel → ~2000ch • high counting rate → ~1M count s-1 (detector total) • high trigger rate → ~100 kcps • small space → installed in the magnet multi channel readout small number of modules and signal lines easy to debug • Concept • multi channel processing • high speed digitization and data transfer • small number of modules and low cost • easy to debug and connect to other devices

  10. Components multi channel processing analog LSI ← sampling/hold, shaping, and multiplex Flash ADC ← high speed digitization Space Wire Protocol (IEEE 1355) ← simple and high speed data transfer protocol Complex Programmable Logic Device ← reconfigurable logic unit analog LSI GEM detector Flash ADC CPLD single line Va32_Rich2 ~2000ch 4 lane 1 lane Readout Electronics (Space Wire) sample & hold block diagram Space Wire host Connector Board (hub) Computer sequential read control / data Space Wire protocol (LVDS) • Advantages • multi channel LSI and serial data transfer ← small number of modules and cables • high speed data transfer ← MAX 400Mbps • easy to fit to other detectors ← by reconfigure CPLD only • low cost/channel ← small number of module • Space Wire is simple protocol ← performed by only one CPLD chip

  11. GEM Example and Application • multi channel readout • silicon strip detector [3] • CdTe detector [3,4] • multi-anode phototube [5] • easy to fit other detector • replacement the detector • performed by reconfiguring FPGA FADC & CPLD board reconfigure CPLD energy distribution measured by the M-PMT. readout system for M-PMT [3] T. Mitani et al., IEEE Trans. Nucl. Sci., 50 (2003) No.4 1048 [4] H. Tajima et al., IEEE Trans. Nucl. Sci., 51 (2004) No.3 842 [5] H. Nakamura, NDM03 poster session.

  12. Summary • We develop GEM Position detector for tracking of charged particle • Stable operation with high gain • High resolution will be performed by Micro Pattern Readout Board • Readout Electronics is consist of Multi-Channel LSI and Serial data link system • Now, Hardware is almost ready • Experiment ~ will be performed in next April