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HLab meeting

HLab meeting. 1/13/09 K. Shirotori. Contents. SksMinus status Drift chambers Timing counters Veto counters Others. Drift chambers. Drift chambers for SksMinus. SDC3&4 : BD chamber ×2 Large DC camber : 2 m×1 m (x,x,u,u,v,v) SDC2 : Old SKS chamber Repair in Tohoku.

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HLab meeting

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  1. HLab meeting 1/13/09 K. Shirotori

  2. Contents • SksMinus status • Drift chambers • Timing counters • Veto counters • Others

  3. Drift chambers

  4. Drift chambers for SksMinus • SDC3&4 : BD chamber ×2 • Large DC camber : 2 m×1 m (x,x,u,u,v,v) • SDC2 : Old SKS chamber • Repair in Tohoku • SDC1 : New construction • Not completely finish the design work…

  5. Drift chambers status • BD chambers are almost ready. • ~300 mm(rms) position resolution • 99% efficiency ⇒To design and product frame • Broken wires of SDC2 are finished to be repaired. • Signal check and TDC data taking • Frame design • SDC1 is under construction… • Discharge problem on liquid gasket ⇒Replace the rubber gasket • How about design ?⇒Frame confliction to Hyperball-J frame

  6. Timing counters

  7. Timing counters for SksMinus • STOF : Using SKS TOF scintillation counter • 2 m×1 m TOF wall • Present 15 segments + new 17 segments • Bought by KEK fund • BH2 : Time zero counter • ~1 MHz counting rate ⇒1 segment counter

  8. Timing counters status • STOF • New segments : Need 34 PMTs • PMT check Finished : 71 PMTs (78 PMTs from BNL⇒7 are used for open campus) • Frame design • BH2 • Scintillator : Available one • PMTs : Booster PMT (old SKS BH2 PMT)

  9. Veto counters

  10. Veto counters for SksMinus • SAC & BAC : (K-, p-) trigger • Aerogel cherenkov counter • M. Sato working • SP0 : K-→p-p0 event veto • T. Otani working • SMF : K-→m-n event veto • Iron shield

  11. Veto counters status • Aerogel cherenkov counters • Radiator (Aerogel) are bought by Kyoto Univ. fund. • Fine mesh PMTs are bought by Osaka RCNP fund. ⇒Production stage + Fiber readout test parallel ⇒Scintillation board (ITA) test @ LNS • SP0 • Scintillation counters : For E559 range counter • Lead plates are ordered. • Frame design in progress • To check by prototype (one layer) ⇒ Production stage • SMF • Scintillation counters : For BNL BT ⇒Need to cut : 2 m ⇒1.2 m • Iron shield ⇒Request for support of KEK

  12. SMF iron block shield Block-A 100 cm×50 cm×50 cm Assemble Block-B 200 cm×100 cm×70 cm wall (Image) 100 cm×50 cm×20 cm

  13. Iron block design ・Block-A 100 cm×50 cm×50 cm×5 ・Block-B 100 cm×50 cm×20 cm×3 Borrow from KEK parts Type-1 In the experiment, we use Type-1 (1.1 GeV/c beam) or Type-2 (1.3, 1.5, 1.8 GeV/c beam) configuration. Type-2

  14. Others

  15. Other components status • Targets • 4He target was ordered. : ~\4,000,000 • Li2O : Company was found. • 10B and 11B : modified old target used in BNL-E930 for the beam profile at K1.8 • 19F : Teflon ((CF2)n) + Design of target stage with BAC and SAC • He bag • Design and order (SKS group)

  16. Summary ○ SDC3&4 : Repair finished ⇒ Frame ○ SDC2 : Repair almost finished ⇒ Frame × SDC1 : ?? ○ STOF : Design and construction (by KEK ?) ○ BH2 : Construction (scintillator + booster PMT) ○ SAC&BAC : Construction ○ SP0 : Design finalize ⇒construction × SMF : Iron shield borrow, frame, scintillation counter cutting △ Targets : under construction あとは人手。。。Hyperball-Jもあるので。。。

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