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Readiness of Forward Muon Arms for W Detection

Readiness of Forward Muon Arms for W Detection. Itaru Nakagawa For the PHENIX Muon Trigger Upgrade Collaboration. Muon Tracking Chambers 3 stations of Cathode strip chambers Each station has multiple planes for redundancy Slow read out -> No trigger Muon Identifier

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Readiness of Forward Muon Arms for W Detection

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  1. Readiness of Forward Muon Arms for W Detection Itaru Nakagawa For the PHENIX Muon Trigger Upgrade Collaboration

  2. Muon Tracking Chambers 3 stations of Cathode strip chambers Each station has multiple planes for redundancy Slow read out -> No trigger Muon Identifier 5 layers of Iarocci tubes in x and y 80 cm of steel plate absorber (total) Provides trigger p > 2 GeV Current Muon System B   MuID MuTr St#1 St#2 St#3 Same configuration in South 2

  3. B Observed in Run9 pp n fake High PT m m p,k Study done by Yoshinori Fukao (RIKEN)

  4. Efficiency Measurement with Cosmic Ray cosmic High Efficiency under Clean Circumstance! Study done by Yoshinori Fukao (RIKEN)

  5. MuTRG System Run09 performance Study done by Yoshinori Fukao (RIKEN) • MuID Algorithm • Track Matching w/ MuID • Timing cut w/ RPC • Track Matching w/ RPC • Neutron Backgrounds • YoshimitsuImazu’s Talk • etc ..  5 MuTrg-FEE xMuID

  6. Rate Dependence of MuID Rejection Power • Can RPC substitute MuID? • Does RPC give better Rejection Power?

  7. MuTRG Road Map to Run11 Production Run RPC3 RPC3 absorber MuTRG Run11

  8. Completed Installation of Absorbers North Station-1 North South 35cm thick SUS310 (2 interaction Length) New Hadron Absorber

  9. MuTRG Final Muon Trigger Configuration RPC3 RPC3 absorber MuTRG RPC1 Run12

  10. MuTr X-Talk

  11. MuTr Cross Talk HV (1800 V) Rise time of anode signal ~ 10 nsec Serious Issue for Big Pulse 100mV 1 MW Anode wire 3V Removed to reduce HV trips .... 100 pF ~0.1 pF/strip 1 MW Cathode strips (96 strip) Decap Doesn’t exist. Anode Readout Pointed out by Tsutomu Mibe@KEK

  12. Event Display of ADC Distribution Gap 1 Stereo Gap 2 Stereo Gap 3 Stereo ADC MIP Gap 1 NonStereo Gap 2 NonStereo Gap 3 NonStereo MIP Strip Origin of Big Pulse -> Neutrons?

  13. Can be serious issue at high rate 10ms Pileup at 100kHz Run 9, 500 GeV data Current set up Rate per strip (kHz) Recap (1/10? cross talk) x2 (Run 11?) x5 (design) Luminosity

  14. Solution HV (1800 V) Rise time of anode signal ~ 10 nsec 1 MW Anode wire .... 100 pF ~0.1 pF/strip 1 MW R<<1M W Cathode strips (96 strip) Additional Circuit to let anode current escape to ground.

  15. MuTr Station-3 Anode Card To Anode Wire Pads for surface mount capacitors Left over Solder + Coating Capacitor (Removed)

  16. North Station-3 Anode Gap Geometrical Constraint 25mm 28mm Anode cards are only accessible from their back. Front pattern can only be visible using an inspection mirror.

  17. Recap Clamp Prototypes R&D by Yoshinori Fukao (RIKEN) YoshimitsuImazu (RIKEN) Kentaro Watanabe (Rikkyo)

  18. Effect of Recap

  19. Test Bench Setup 90Sr Source Strip#22 Anode wire w/ and w/o Clamp

  20. Strip# Comparison w/ .vs w/o Terminator w/o Clamp w/o Clamp 17 27 22 Trigger w/ Clamp w/ Clamp 17 27 22 Trigger

  21. Comparison w/ .vs w/o Clamp Conductive Rubber Average ADC [channel] With Clamp Strip Number w/o Clamp

  22. Neutron Absorber

  23. The full muon arm again • Neutrons in St1 • Current setup • SS310 absorber • +SWX207HD5 • Only SWX207 • Only 1/20 of all PYTHIA events • Only MuTr St1 • Y-scale is from old macro • Only neutrons from upstream of St1

  24. Thermal Neutron • Origin of Big Pulse • Thermal Neutron Absorber 478keV (e,g) 25meV neutron B 25mm Pb 1cm MuTr Fe 1cm

  25. Summary • High Momentum Muon Trigger (MuTrig-FEE & RPC3) is to be commissioned in Run11 • Sufficient Rejection Power can be achieved, but trade off of efficiency. • 99% Efficiency with Cosmic at High PT • Thermal Neutron is suspect degrades MuTr performance • Neutron Absorber Partial Install • Recapacitation Clamp Prototypes to be tested in Run11

  26. Backup Slides

  27. Towards Successful Installation

  28. Alignment Spacer determines Transverse direction within ~ 300mm. Fiber scope shot Possible misalignment can be found by visual inspection using a fiber scope Fiber Scope

  29. Electrical Contact Readout socket Electrical Contact will be confirmed by measuring Voltage using temporary readout tool. Readout Board To be removed after the measurement.

  30. Installation Proposal To be installed North Bottom Octants

  31. Extreme Breathing Test HV=1900V Duration 2min

  32. MuTr Station-3

  33. Recapacitation (Station-3) Capacitorはすべて取り外し済み。 Station-3 Chamberを取り出すの実質的に難しい。 簡易的に取り付けられるクリップでグラウンドに落とす。

  34. Coating Takes time, but removable remover 化学的に溶かすには175℃でクロロナフタレンに反応して溶解（１時間以上）。 Print Kote Parylene C 事実上ムリ。 Anode Card De-Capacitation(コンデンサーの取り外し）の際にパリレンが溶けてるのでは？

  35. DAQによる測定 90Sr線源 ADC>1000ch以上の事象 ADC [channel] …21,22,23… ストリップ番号 …,13,14 31,32,… ストリップ番号 ADC [channel] ADC>1000以上の大きなパルスを 観測したとき、周辺のストリップに は逆電価のシグナルが観測される。 Anode wire を共有して いない Anode wire を共有して いない 線源直下のストリップ ストリップ番号

  36. Low energy neutrons • Low energies • Fluctuation before SWX needs investigation • Suppression of very low energies might depend on input neutrons before SWX207HD5 behind SWX207HD5

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