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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. - PowerPoint PPT Presentation
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UoM activitiesThe Usual (and More) Suspects
New Arrival Time Fit FunctionAAT0002 gas performance
Initial tests with Br doped gases
New Arrival Time Fit Function
6/24/14 UoM activities 2
AAT0001HV=1150V
AAT0002 Voltage Scan (Zoe)
6/24/14 UoM activities 3
Arrival Time AAT0002 at 1000V
6/24/14 UoM activities 4
6/24/14 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.
6/24/14
UoM activities 7
New Gas Mixing Station
6/24/14
MixingVolumeValve
Panel Valve Shutoff
Gauge
Bypass
Vacuum
Gas AGas B
Needle
UoM activities 8
Initial Tests with Br-gases on VPIAr + 0.5% Br (bottle) at 747 Torr1. No pulses observed up to HV=1000V (mV threshold)2. At around 500 V, not null current:
a) onset of current is sharp and repeatable at 495-500 V.b) 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.
3. HV polarity reversal attempt: briefly bipolar pulses, unrelated to source.
Pure Argon at 741 Torr4. 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.
6/24/14
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.6/24/14
