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X 核スペクトロスコピー ー K1.8 B.S. & SKS ー

X 核スペクトロスコピー ー K1.8 B.S. & SKS ー. 高橋　俊行 KEK J-PARC Online/DAQ W.S. Contents. X 核スペクトロスコピー 装置　 K1.8 Beamline と SKS High rate での Chamber の考察 必要な回路のチャンネル数 まとめ. X Hypernuclear Spectroscopy. X potential in nuclei X -N interaction (S= - 2 Baryon-Baryon Int.)

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X 核スペクトロスコピー ー K1.8 B.S. & SKS ー

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  1. X核スペクトロスコピーー K1.8 B.S. & SKS ー 高橋　俊行 KEK J-PARC Online/DAQ W.S.

  2. Contents • X核スペクトロスコピー • 装置　K1.8 Beamlineと SKS • High rateでのChamberの考察 • 必要な回路のチャンネル数 • まとめ

  3. X Hypernuclear Spectroscopy • X potential in nuclei • X-N interaction (S=-2 Baryon-Baryon Int.) • E.O.S. of Neutron Star Core • XN-LL(-H) Mixing • ~28MeV difference XN-LL • ~75MeV for L-S • ~300MeV for N-D

  4. 実験方法 • (K-,K+) reaction spectroscopy • p + K-->X- + K+ • P(K-) = 1.8GeV/c measured by B.S. • P(K+) = ~1.3GeV/c measured by SKS • 2-3 MeV/c2(FWHM) resolution • Target mass dependence • CH2, 12C, 28Si, 51V, ..., 208Pb

  5. Theretical Prediction 2MeV FWHM Resolution 58Ni(K-,K+) 208Pb(K-,K+) Folding Folding Wood-Saxon Wood-Saxon V0=-24MeV V0=-24MeV V0=-16MeV V0=-16MeV X- bound region X- bound region MHY-MA [MeV] MHY-MA [MeV]

  6. Hadron Hall Layout Ref. Cntrl. Hat Elec. Hat Upgraded SKS K1.8 K1.1BR FF ES2 MS2 Beam Spectrometer ES1 T1 KL K1.1

  7. K1.8 Beamline K- + p- K decay x 3 pの混入 x 2 Beam Spectrometer上流側

  8. Wire Chamberでどこまで測れるか？ • 現在のK6/SKSの状況 • 5mm cell size DC • 3.6Mp+/Spill (Spill=1.4sec) • p/p+ ~0.1 • BeamSize@DC ~10cm • drift time ~50ns • t ~ 75ns Singles Rateは？ Total / wire 200kHz/wire を目標にすると 3mm cell size 10cm beam size ext. time ~0.6 sec B.S.の下流側はOK

  9. MWPCでは？ 1mm MWPC 10cm beam size cluster sizeが１となれば、rate的にも 位置分解能的にも問題はない。 実際には、斜め入射やAccidentalでCSが大きくなるかも？ • ノイズを落とすため、時間情報も欲しい。 • Trigger前後100ns程度のON/OFF情報 • １０ns程度の分解能で • Multi-hit TDCでL.E./T.E.をWire毎に記録する。

  10. Beam Spectrometer @ K1.8BL FF BAC1,2 • QQDQQ Spectrometer • VI->VO point to point optics • <X|q> = 0 • <X|X> = -0.44 • <X|d> = 1.57cm/% BH2 VO BC3,4 Q Q Dp/p ~1.4x10-4 sx~0.2mm D BC1,2 Q MS2 Q VI BH1

  11. Detectors of Beam Spectrometer Multi-timingのMWPC encoding systemかDrift Chamber的な読出し HR-TDCのほかに Multi-hit TDCでの 読出しも行いたい。 （Rateの高いCounter）

  12. K1.8 Spectrometer (SKS) SKS (395A,2.7T) New Dipole Magnet ~1.5T 30cm gap 950 mm Total Bend Angle 85 degree DC4 DC5X DC5Y r=1325mm DC3 DC2 DC1 TOF AC1 LC AC2

  13. Detectors of SKS (wire chambers ) read by multi-hit TDC both Leading Edge & Trailing Edge Dt~0.5ns, F.S. 2-5msec, 16depths

  14. Detectors of SKS (PMTs) Read by ADC & HR-TDC (25ps/ch)

  15. まとめ • X Hypernuclear Spectroscopy @ K1.8 • Beam Spectrometer & Upgraded SKS Spectrometer • Rateに強く、物質量の少ない位置検出器が重要 • 1mm MWPC • 3mm DC • Max 200kHzに耐えうる回路（Amp-Shaper-Discri.) • 必要なチャンネル数 • 6000 ch. for wire chamber (Multi-hit) • 2500 for MWPC • 200 ch. for PMTs (ADC, HR-TDC)

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