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

Revision as of 08:41, 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 will build a control box that uses TLL signal on BNC cable (TTL=high=close?, TLL=low=open?)
- LST400: on-hand, delay to open (10ms) + full open (20ms) and delay to close (10ms) + full close (20ms); operates to 3Hz and large aperture 8mm (recommend <6mm beam)
- LST202: need to purchase, delay to open (1ms) + full open (0.3ms) and delay to close (1.2ms) + full close (0.3ms); operates to 150Hz and 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)
+* 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?, TLL=low=open?)
+** [http://nmlaser.com/products/laser-shutters/lst400/ LST400]: on-hand, delay to open (10ms) + full open (20ms) and delay to close (10ms) + full close (20ms); operates to 3Hz and large aperture 8mm (recommend <6mm beam)
+** [http://nmlaser.com/products/laser-shutters/lst202/ LST202]: need to purchase, delay to open (1ms) + full open (0.3ms) and delay to close (1.2ms) + full close (0.3ms); operates to 150Hz and 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)