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Development of Silicon Strip Detector for the measurement of Ξ-atom X-rays

Development of Silicon Strip Detector for the measurement of Ξ-atom X-rays. Hitoshi Sugimura Kyoto University (For E03 collaboration). C ollaborators. SNU Kiyoshi Tanida Ryuta Kiuchi Joo Chang Woo JAEA Ken’ichi Imai Hiroyuki Sako Susumu Sato

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Development of Silicon Strip Detector for the measurement of Ξ-atom X-rays

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  1. Development of Silicon Strip Detector for the measurement of Ξ-atom X-rays Hitoshi Sugimura Kyoto University (For E03 collaboration)

  2. Collaborators • SNU Kiyoshi Tanida RyutaKiuchi Joo Chang Woo • JAEA Ken’ichi Imai Hiroyuki Sako Susumu Sato • KyotoU Hitoshi Sugimura Satoshi Adachi Hidemitsu Asano • RCNP TomoakiHotta

  3. J-PARC E03 experiment Strong Interaction makes Energy Shift K+ K- Fe p 1.8GeV/c Ξ- Ξ- Fe Fe X-ray We detect X-ray from Ξ-atom by using Ge-detector for the first time. Energy shift provides information of ΞN interaction. Ge-Detector

  4. J-PARC E03 experiment Strong Interaction makes Energy Shift K+ K- Fe p 1.8GeV/c Ξ- Ξ- Fe Fe 1-step ,We detect X-ray by using Ge-detector. How to detect X-ray from xi atom is first challenge And 2-step make sure that how much energy shift. Make us information to ΞA interaction X-ray Ge-Detector Expected Energy Shift (Simulation)

  5. Detector Set up KURAMA magnet Hyperball-J K- target K+ SSD K- Target SSD measures Ξtrack and dE/dx to select slow Ξ so that better S/N ratio will be obtained for stopping Ξ. SSD

  6. Silicon Strip Detector (SSD) • Thickness ~300um • Effective area 6cmx6cm • Pitch 80um x 768 strips • Read out chip : APV25 • 128ch readout /1chip • Shaping time 50nsec • Serial Data Transfer • Radiation tolerancechecked up to 3x1014protons /cm2 • At 108Hz beam, efficiency is accomplished up to 96%

  7. Beam Test at J-PARC K1.8 beamline K Target (inside of cryostat) SSD SSD SSD 計12面　 768ch

  8. Wave analysis

  9. Time resolution and S/N • Reconstruct Hit Timing σ=3.61ns If 107Hz beam , probability accidental hit is 13.6% Good enough to identify ghost tracks. σ=3.61ns • Reconstruct pulse height by wave form analysis. time MIP signal Noise level S/N= We have achieved SNR>10 =17.0 S/N

  10. Summary • SSD has been developed for E03 which detect X-ray from Xi atom for the first time . • SSD has been tested at J-PARC K1.8 beamline. • We have obtained S/N = 17 and time resolution is 3.61ns which is sufficient for E03 experiment.

  11. Back up

  12. a new Ge detector array Hyperball-J Hyperball2 ( ε ~4 % for 1 MeV) can not be used @J-PARC due to high count rate & radiation damage → Need new Ge detector array Lower half of Hyperball-J PWO counter Ge detector Target • Features • Radiation-hard Ge detector • →Mechanical cooling • Fast background suppressor • → PWO counter • Pulse-shape readout and analysis • Adjustable detector geometry • Large photo-peak efficiency • → ε~6.1 % @1 MeV with 32 Ge detectors • Remotely controlled and monitored Pulse-tube cooler

  13. K1.8 beamline for KURAMA setup

  14. Raw Signal signal

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