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Development of Tracking Detector with GEM

Development of Tracking Detector with GEM. Kunihiro Fujita RCNP, Osaka Univ. Yasuhiro Sakemi CYRIC, Tohoku Univ. Masaharu Nomachi Dep. of Phys. , Osaka Univ. Physics Motivation. Short range component of Nuclear force: g’ DD p + r +g’ model

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Development of Tracking Detector with GEM

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  1. Development of Tracking Detector with GEM Kunihiro Fujita RCNP, Osaka Univ. Yasuhiro SakemiCYRIC, Tohoku Univ. Masaharu Nomachi Dep. of Phys. , Osaka Univ.

  2. Physics Motivation • Short range component of Nuclear force: g’DD • p+r+g’ model • Landau-Migdal parameters:g’ (g’NN, g’ND, g’DD) • g’DD: Few experimental information • Coherent pion production is sensitive tog’DD g’ affect • Critical Density of Pion Condensation • property of high density nuclear matter universality (gNN=gND=gDD) g’DD

  3. Detector Requirement • Motivation • Tracking of low energy (< few hundred MeV) charged particle • Requirements ( why GEM? ) • high position and angle resolution • spatial : <100mm & angle: < 2 mrad • rate capability : >100kcps • can be operated under high magnetic field: < 1 Tesla • boundary condition ~ narrow space 400 MeV proton from Ring cyclo. 70m TOF neutron pion, charged particle B~1.5T Swinger Magnet (proton is bent by 90 deg) 10 cm 80 cm TOF counter (NPOL2) Magnet & Counter Box

  4. Size : 1×1×0.1 m3 4 liquid, 2 plastic scintillators with charged particle catcher Energy resolution : 500 keV Detection efficiency : 15 % Flight Path was set to 70m Developed by Tokyo Univ. group Gas Electron Multiplier (GEM) detector~ Tracking newly developed for this experiment Plastic Scintillator ~ Trigger Size : 320×50×10 mm3 2 plastic scintillators Fine Mesh PMT ~ gain is 105 at 1 Tesla Detectors Neutron Counter (NPOL2) Pion Counter Trigger counter Tracking counter typical

  5. Detector specification • To Get position information for Two layers • Component • Cascade GEM structure ~ Three layers • Two dimensional Readout Board • Charge Information : Multi channel ADC • Specification • high position resolution : 100mm (designed value) • radiation tolerance • tolerance for magnetic field: ~1 Tesla cathode 3mm GEM1 1mm GEM2 1mm GEM3 1st Plane Cable (analog sig.) 1.5mm 110mm Readout Board H.V. 2nd Plane 452mm 77mm Electronics

  6. GEM • CERN-GEM (supplied by GDD group) • Active Area: 307.2x50 mm • Segmented by two area • protection from discharge • Standard Material & Size • Cu-PI-Cu 5-50-5mm • hole 70mm, pitch 140mm 50 307.2 H.V. GEM holes (standard) triangular pattern size: 70um pitch: 140um 200mm separation cross section the measured amplification factor in each gas.

  7. Readout Board and Connector • Readout Board • Same size with GEM • Base : G10 50mm • Cu-PI-Cu : 5-25-5 mm • Strip width • horizontal (x) : 80 mm • vertical (y) : 340 mm • pitch: 400 mm • Connection • Flexible Cable • Sandwiched Structure : GND-Signal-GND 768ch 120ch 340mm 80mm connect 400mm Readout Board (supplied by ‘RAYTECH, INC.’) Flex Cable (supplied by ‘TAIYO Ind. CO., LTD’)

  8. Readout Electronics Space Wire Protocol Analog-LSI boards Analog MUX Flash ADC to VME module data CPLD Readout Board I/O Board ~2000ch FPC (one of 14) Trig/Ctrl Va32_Rich2 Readout Electronics • Analog • VA: amp, sample/hold, serialize • TA: shaper, discriminator  trigger • Dynamic range : ~ 140 fC • 256ch outputs are multiplexed • Digital • ADC: 12-bit • Serial Data Transfer (LVDS) • Sparse Data Scan : Skip un-triggered chip • Data Transfer Rate • ≳ 2kHz  limited by FADC to VME

  9. 2ch Trigger Sci. SW-VME x4 in x2 out x2 FPGA Trigger CPLD GDG x8 to/from neutron DAQ memory VME bus Data Acquisition • SW-VME module • transceiver ( ADC data, control commands) • decoder • memory control • Trigger module • decide coincidence level GEM, Trigger SCI, and neutron counter trig hold from GEM data / control

  10. Experiment (1) Spectrometer (Grand Raiden) GEM • Date: July 2006 • Reaction: 12C(p,p’), faint beam (direct) • Beam: • particle: proton • energy: 392MeV • rate : <2k count / sec • Detector Setting • Gas : Ar/CO2 (7:3) • DVgem : ~ 410V (gain ~12k) proton

  11. trigger counter GEM proton

  12. Result(1) • Position Dependence of GAIN • uniformity was was 2%(RMS) for x1, and x2 3~5% for y1, and y2 • Angle Dependence of Cluster Size (CLS) • at 0 deg.  cls ~ 3, 4 • at 40 deg.  cls > 10 q=0 deg. q=40 deg. Fig1. position dependence of gain

  13. Tracking Result • Tracking information was observed • ~ peak width was 2mm (include beam size) FWHM:~2mm (= 200 keV) [mm] beam position with three magnetic field settings.

  14. Experiment(2) • Date: October and November 2007 • Reaction: 12C(p,np+)12C(g.s.) • Beam: • particle: proton • energy: 20MeV, 392MeV • rate : <2k count/sec (pion counter) • Detector Setting • installed in the high Magnetic field ~1 Tesla • GEM + trigger SCI + neutron counter neutron p+ proton

  15. 50cm Swinger Magnet 12C Target pion counter neutron proton beam

  16. Result(2) ADC • Gain dependence in Magnetic field • measured with 3 settings 1.1, 0.98, and 0.75T • fluctuations was less than 3% • position resolution • 2.3mm (FWHM) FWHM:~2.3mm peak position for each B

  17. SUMMARY • We developed GEM detector for nuclear experiment. • Large size GEM and Two dimensional Readout Board is made. • Readout Electronics was developed with VA/TA chip, FADC board, SW-VME and CPLD module. • Beam test was performed and specification was estimated. • Data run was performed and position information was acquired successfully in the high magnetic field. Next Plan • improve DAQ system for the high counting rate • Data analysis with GEM + neutron counter  Missing Mass Spectrum

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