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BNL report ～ the history of Run7 start up ～

BNL report ～ the history of Run7 start up ～. Yoshihide Nakamiya. BBC hardware work. Interlock test - one ADAM module was not worked -> replace it to a new module - one thermocouple broke ( S2-4 ) -> will fix after run7 External charge scan

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BNL report ～ the history of Run7 start up ～

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  1. BNL report～the history of Run7 start up～ Yoshihide Nakamiya

  2. BBC hardware work • Interlock test • - one ADAM module was not worked -> replace it to a new module • - one thermocouple broke (S2-4) -> will fix after run7 • External charge scan • - Adc conversion factor (BbcCalib.adc) • - find one Adc to lost linearity (Adc[72]) -> replace QVC＋ADC • Internal charge & timing scan • - Tdc conversion factor (BbcCalib.tdc0 & tdc1) • - one of test pulse injector was not worked (Adc[85]) • -> replace discriminator for Tdc0&Tdc1 • - Adc[126] was not worked properly • -> replace QVC＋ADC for Adc[126] • Measurement of noise rate • - a few thousand Hz at most (th = 30 mV)

  3. Interlock test ［結果］ ZOOM 交換した ADAM ⇒Fixed！ 壊れている熱電対 　⇒run7の後に修理

  4. External charge scan ~ After replacement ~ ~ Before replacement ~ We got proper gain curve for Adc[72] after replacement of two daughter cards (QVC+ADC).

  5. Internal charge & timing scan ~ Before replacement ~ ~ After replacement ~ • Adc[85] was fixed after replacement of discriminators Tdc0&Tdc1). • Adc[126] was fixed after replacement of two daughter cards (QVC+ADC).

  6. Calibrations and Time-in • Time-in • - Adjust global timing offset • ⇒position delay : 170 • fine delay (ch 7) : 60 • Pedestal scan • - Adc pedestal (BbcCalib.pedstal) • HV optimization • - magnetic field off • ⇒http://www.hepl.hiroshima-u.ac.jp/phx/bnl/pmt/ • Run7/070323/opHV_run7_bon_070323.pdf • - magnetic field on • ⇒http://www.hepl.hiroshima-u.ac.jp/phx/bnl/pmt/ • Run7/070402/opHV_run7_boff_070402.pdf • Gain calibration • - PMT gain (BbcCalib.pmtgain) • Slewing calibration • - slewing parameter (BbcCalib.slewpar0&slewpar1) • Update LUT&Data Base

  7. Time in V124 Blue Beam Sync -position delay : 170 -fine delay (ch 7) : 60 Global timing offset wasadjusted on v124. Collision events are in the middle of Tdc window.

  8. Pedestal scan run list ========================== Threshold of Tdc0 run # ========================== 5mV run226402 10mv run226403 20mv run226404 30mv run226405 15mv run226406 ========================== pedestal was extrapolated by using gain curve as a function of threshold.

  9. HV optimization <HV optimization criteria> BBC play a role of not only trigger but centrality determination. We have to optimize HV to satisfy both requirements. 1) Trigger : MIP peaks must not be cut off by threshold since BBC play a role as trigger. 2) Centrality : We must assure linearity of Centrality. We need to pay attention to overflow of Adc under high multiplicity environment like Au+Au collision. I consider these criteria, especially about PMTs which belongs to the inner ring.

  10. HV optimization : B ON Run 226332 Run 227016 HV was optimized ~30 V decrease Tdc<2600 Isolation cut Tdc<2600 Isolation cut Tdc<2600 Tdc<2600 overflow We optimized HV for B ON.

  11. HV optimization : B OFF Run 227702 Tdc<2600 Isolation cut Tdc<2600 We optimized HV for B OFF.

  12. Gain calibation Run 227016 (B ON) - tdc0 < 2600 - isolation cut Run 227702 (B OFF) - tdc0 < 2600 - isolation cut gain calibration was done.

  13. Slewing calibarion Run 227016 (B ON) Slewing correction Run 227702 (B OFF) Slewing correction slewing calibration was done.

  14. LUT and DataBase • LUT : We made LUT • ⇒ need z offset from DC guys to finalize it. • DB : version 4001 & 4002 were updated • ⇒ need z offset from DC guys to finalize it. We are waiting for getting z offset calculated by DC&PC.

  15. other problems, solutions, remaining tasks • Laser offset calculation • HV mainframe 16 • - problem 1 : HV module was tripped • - problem 2 : HV mainframe was tripped • ⇒ 1) fix 5 fans since 5 fans were not worked • 2) replace the HV mainframe 16 • Remaining tasks • - LUT will be updated (the final version) • - Data Base will be updated (ver 4001, ver4002) • ⇒We are waiting for getting z offset calculated by DC&PC in order to • finalize calibrations

  16. Laser offset calculation The special connector were attached in laser fiber of North-bottom. -Laser signal could get delayed. -Laser intensity could decrease.

  17. Laser offset calculation Affter correction Before correction - Delay depended on laser intensity were automatically fixed by slewing correction - Delay by connection of the connector were fixed by manually as shown above.

  18. Laser offset calculation Black : before correction Red : after correction We calculated Zvertex offset by laser after corrected systematical delay of North-Bottom.

  19. HV mainframe 16 : problem 1 <Symptom 2> 1) HV became Disable. for HV_BB_N-1 & HV_BB_N-1 2) Status indicator shows.. HV_BB_N-1 : 10 HV_BB_N-2 : 40 **status 10 means “Trip -- Violation of supply limits” I'm not sure for status 40

  20. HV mainframe 16 : problem 2 <Symptom 1> 1) HV mainframe looks like OFF but actually ON. 2) Measured voltage went to 0V. But HV is “Enable” for HV_BB_N-1 & HV_BB_N-1

  21. Slot 11 Slot 1 Slot 0 N1 N3 0 0 . . . . N4 N2 1 1 HV mainframe 16 : Solutions? • Cable N1 and N2 are separated. ⇒problem 1 was disappeared • Fix fans on the HV crate since 5 fans (total 12 fans) broke • HV mainframe 16 was replaced ⇒ problem 2 is not seen so far

  22. Remaining tasks <Remaining tasks> • LUT will be updated as the final version • Data Base will be updated (ver 4001, ver4002) We are waiting that DC guy’s work has finished for the final update.

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