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UoM activities The Usual (and More) Suspects

UoM activities The Usual (and More) Suspects. New Arrival Time Fit Function AAT0002 gas performance Initial tests with Br doped gases. New Arrival Time Fit Function. AAT0001 HV= 1150V. AAT0002 Voltage Scan (Zoe). Arrival Time AAT0002 at 1000V. Arrival Time AAT0002 at 1020V.

irma-cooley
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UoM activities The Usual (and More) Suspects

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  1. UoM activitiesThe Usual (and More) Suspects New Arrival Time Fit Function AAT0002 gas performance Initial tests with Br doped gases

  2. New Arrival Time Fit Function AAT0001 HV=1150V UoM activities

  3. AAT0002 Voltage Scan (Zoe) UoM activities

  4. Arrival Time AAT0002 at 1000V UoM activities

  5. Arrival Time AAT0002 at 1020V UoM activities

  6. Future Microcavity Experiments • Repeat voltage scan for the same pixel (for reproducibility) while extending the HV range • Arrival time at higher HV • Try as AAT0003 Ne + 0.4% Ar + 1% SF6 : replacing CF4 with SF6 in AAT0002 to see if it works at higher HV and so shrinking the arrival time distribution. UoM activities

  7. New Gas Mixing Station Mixing Volume Valve Gas A Gas B Gauge Vacuum Panel Valve Shutoff Bypass Needle UoM activities

  8. Initial Tests with Br-gases on VPI Ar + 0.5% Br (bottle) at 747 Torr • No pulses observed up to HV=1000V (mV threshold) • At around 500 V, not null current: • onset of current is sharp and repeatable at 495-500 V. • The current is at the level of a microamps, but increasing nonlinearly with increasing voltage. At 600 V a ~15% increase in HV leads to about 1.7-1.8 increase in current. • HV polarity reversal attempt: briefly bipolar pulses, unrelated to source. Pure Argon at 741 Torr • Large amplitude pulses (>30V) at ~740 V and above. Some lines are much more active than others, but not visible response to the source. Easily in regeneration. UoM activities

  9. Initial Tests with Br-gases on VPI (2) Ar + 0.05% Br at 734 Torr • Seen a few pulses (~6V amplitude) for a minute or so around -460V, then nothing. • After polarity reversal again a few pulses and then nothing. • Interestingly with HV=+1kV bipolar signal visible. • Also a unipolar signal 5-8 ns wide is observable, although unclear if it was in response to the source. Ar + 0.01% Br at 730 Torr • Still to be tested (filled yesterday) If it does not work, we will move to 3 components gas starting with Ar + 0.5% Br + 0.5% Xe. UoM activities

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