Bubble Chamber Meeting Wednesday August 5, 2015
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We will meet in TL 2221 on Wednesday August 5 at 3:30 pm EST.
For those calling in we'll use the Blue Jeans [1] audio conference system.
Phone number: 1-888-240-2560 Meeting ID: 3528502673# Meeting URL: http://bluejeans.com/3528502673
Agenda:
1- Bubble Chamber progress at JLab
2- Laser Shuttering:
- Would like to use a mechanical shutter (100% extinction)
- John Hansknecht will build a control box that uses TLL signal on BNC cable (TTL=high=close=beam OFF, TLL=low=open=beam ON)
- LST400: on-hand, time to open (~30ms), time to close (~30ms), large aperture 8mm
- LST202: purchase, time to open (~1.3ms), time to close (~1.5ms), small aperture 2.3mm (recommend <1mm beam)
- Alternatively use an electro-optic shutter (>1000:1 extinction, but fast rise/fall times <5ns)
- repurposes cell in optical path, so more invasive and more work installing HV driver, control circuit)
3. Beam test of 5D line in the week of August 10 [2]
Notes from this meeting:
- Bubble Chamber:
- Laser Shutter:
- We decided on shutter LST400 ~30ms open/close response time.
- Do we have the LabView TLL plug-in module?