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


Notes from this meeting:


  • Bubble Chamber:
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