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Ckov status

Ckov status. David Lange, Doug Wright LLNL May 4, 2004. Hardware status. All PMTs installed, cabled, under HV for ~2 months now. Recently increased HV to nominal running value: 2100V. No problems with HV. One remaining system: LED pulser.

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Ckov status

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  1. Ckov status David Lange, Doug Wright LLNL May 4, 2004

  2. Hardware status • All PMTs installed, cabled, under HV for ~2 months now. • Recently increased HV to nominal running value: 2100V. No problems with HV. • One remaining system: LED pulser. • Patch panel box on B. Jones’ desk – in line behind other MIPP work. • Should be ready this week. • Chamber filled with C02 • p/K/p radiatate at 40 GeV

  3. CAMAC status • Problems at time of last collaboration meeting now solved. • Seem to have robust branch highway to and between our crates. • We do see problems most likely due to heat. • ADC/TDC modules don’t always give lams • Problems gone this week • Added fans, cooler weather • Much of DC electronics off • Racks+crates no longer (very) hot to touch. • Need to monitor temperature near RR12 closely

  4. “Online” software status • CKOVDetector code written and debugged • Code to decode raw data written and debugged. • In recent versions of MippIo/raw2root • Online monitoring code recently committed • Mirror by mirror adc and tdc plots • Cabling map in the database. • Success using anamipp to make histos • Until rewrite of EventDataModel/IoModules etc. • (Is it time for a ‘prelim bugs software mailing list so that fewer people independantly discover the same problem?)

  5. Timing concerns.. • TDC signals arrive ~240ns before gate from 2323 module: • Time for TDC signals from T00 ~ 110 ns • My understanding of trigger delays: • 30ns T00 to trigger rack • 150ns to leave trigger rack • 90ns on cables to rack • 10ns in 2323 (?) =280ns • Estimate off by 70ns … is 280ns verified?

  6. Evidence of beam: • One mirror on beam axis sees > pedestal in essentially all events. • Evidence for hits > pedestal in most other mirrors. In process of evaluating how many do/don’t work properly.

  7. Many TDCs work too Thresholds need to be lowered…

  8. Gas : Crisis du jour • C4F10 Saga: • Planned to wait ‘as long as possible’ to order gas given $$ issues. • Vendor and rough quote in hand (3M) • In ~Feb found out that 3M stopped C4F10 production • Terry quickly found new vendor but at 2x $. • Planned delivery date = April 1 • Actual ~ April 20 • Whoops: vendor delivered the wrong gas.

  9. C4F10 situation (II) • Vendor looking at alternative suppliers • 1 so far: another 3x $$ and 4 weeks • Also straightening out with 1st vendor…. • Terry looking at alternative vendors • Looking again at gas alternatives • Not many if any that will have similar physics performance.

  10. Conclusion • PMTs look to be working • Concerns: • Gas • Heat • Pulser system to be completed. • Need to think about event display.. • Current problems in io classes

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