1 / 17

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

ilya
Télécharger la présentation

Development of Tracking Detector with GEM

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. 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

More Related