Difference between revisions of "Bubble Chamber Meeting Wednesday August 5, 2015"

Revision as of 11:36, 5 August 2015

We will meet in TL 2221 on Wednesday August 5 at 3:30 pm EST.

Phone number: 1-888-240-2560
Meeting ID: 3528502673#
Moderator Passcode: 5978#
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)

@@ Line 14: / Line 14: @@
 - Laser Shuttering
-* Would like to use a mechanical shutter (100% extinction); John will build a control box that uses TLL signal on BNC cable  (TTL=high=close=beam OFF, TLL=low=open=beam ON)
+* 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)
 ** [http://nmlaser.com/products/laser-shutters/lst400/ LST400]: on-hand, time to open (~30ms), time to close (~30ms), large aperture 8mm
 ** [http://nmlaser.com/products/laser-shutters/lst202/ LST202]: purchase, time to open (~1.3ms), time to close (~1.5ms), small aperture 2.3mm (recommend <1mm beam)