Bubble Chamber Meeting Wednesday August 5, 2015

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

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Notes from this meeting:

• Bubble Chamber: