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HBD Update: DC Meeting June 2006

HBD Update: DC Meeting June 2006. Thomas K Hemmick for the HBD Crew…. Overview of HBD Progress:. HBD Prototype Tests: Excellent Experience; many lessons learned: Install; Cabling; HV; LV; Noise; Gas QA; Gain; Elect; DAQ; LVL-2; Offline; One Mystery in Data:

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HBD Update: DC Meeting June 2006

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  1. HBD Update: DC Meeting June 2006 Thomas K Hemmickfor the HBD Crew…

  2. Overview of HBD Progress: • HBD Prototype Tests: • Excellent Experience; many lessons learned: • Install; Cabling; HV; LV; Noise; Gas QA; Gain; Elect; DAQ; LVL-2;Offline; • One Mystery in Data: • MIP apparently seen (Forward Bias). • Electrons give larger signals (great). • All Signals too low…Factor of 6 Mystery. • Learning the surprises now is the PURPOSE of the test… • HBD Construction: • HBD #1 nearly complete…Ship next week. • Glove Box installed & Running at Stony Brook.

  3. Quick Comments: • Installation: smooth…but detector should have “handles” instead of gas pipes for lifting. • Cabling: Final cabling plans excellent. (D. Lynch) • HV: Continuously at full voltage…never tripped. • LV: Fool-proof…low noise means good grounds. • Noise: pedestal sigma < 0.5 photo-electrons. • Gas QA: Plumbing perfect; detector is ONLY source of contamination…prototype leaks/outgasses some: • 20-25 ppm water, 15-20 ppm oxygen; ONLY 3-4 p.e. loss. • Gain:55Fe source shows published gain. • Electronics: Works through Full DAQ. Maybe fastest turn on of new system in PHENIX history?? • A few channels died (while cabling?). Must investigate. • DAQ: Reliable. System occasionally needed feeds. • LVL-2: SUPERB!! The LVL-2 stream = high purity electrons. • Offline: HBD data smoothly included in CNT files…

  4. PadId4 PadId1 50mV 100mV 250mV PadId5 PadId8 1500mV 1000mV 500mV Calibration: • Calibration uses test pulser input of pre-amps read through full electronics chain. • Each channel gets gain curve. • Online determination shows 0.1 fC/ch. • Exactly the same as design value.

  5. 430mVGain=1x104 Pulser Gain of Detector (Hutch Test): • 55Fe source (6 keV X-rays, 109-e’s). Clear peak. • Absolute gain can be determined by comparing the signal from pulser (known charge) to 55Fe. • Gain = 1 x 104…exactly consistent with publication. • Same pulser that propagated through full chain.

  6. Hadrons and Electrons in Forward Bias • Forward bias allows hadrons to make reference signal. • MIP apparently seen…electrons give bigger signal. • Factor-of-6 Mystery: Calibration says MIP peak should be channel 600 instead of channel 90.

  7. Row-Column Correlation • “Rows” in phi, “Columns” in Zed. • Offline determines predicted location of track. • Clear correlation of track projection with struck pad.

  8. Forward-1X Gain Reverse-1X Gain Forward-2X Gain Reverse-2X Gain Electron Hit Finding Forward • Electrons are produced in the collision and in the HBD back plane. • Should be ~2X as many from behind HBS as in front. • In forward and reverse mode electron efficiency roughly right and independent of gain. Reverse

  9. HBD In Beam Tests • Extremely valuable experience. • Detector seems operational and responds differently to hadrons & electrons. • Need to complete all data analysis for N0. • Factor-of-6 Mystery might be most important discovery (why we did this now). • Request for getting HBD “out”: • Return detector to floor (dead turtle position). • Restore to hutch tests. • Main Electronics  Chi.

  10. Main HBD • 10 days to finish 1st vessel after PCB. • 2nd PCB shipping to WIS now. • First Vessel Ships Middle of Next Week. • Second Vessel Ships End of June.

  11. Glove Box is here and installed. • 0.6 ppm water!! • Equipping unit for production now. • Dry run next week…production after… • <1 month per HBD (factor of 2 contingency)

  12. Summary • Need to finish analysis of all data. • Need to understand Factor-of-6. • On track for vessel delivery 1st August (tight but can be done). • Pre-amp board needs to be farmed out. • FEM Electronics need 3 months after final design (3 weeks from now following post-mortem of dead channels) • End of September… • Not a delay of vessel installation… • “May you live in interesting times”.--RFK Chinese Curse(??)

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