Difference between revisions of "February 11, 2015 - CIS Group Meeting"
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| Line 1: | Line 1: | ||
| − | ==Startup | + | ==CEBAF Startup== |
'''Laser Program''' | '''Laser Program''' | ||
:A = 50uA @ 125 MHz or 100uA @ 250 MHz | :A = 50uA @ 125 MHz or 100uA @ 250 MHz | ||
| Line 25: | Line 25: | ||
==GTS== | ==GTS== | ||
| − | ''' | + | '''Recovering High Voltage''' |
| − | :Bubba repaired leak, pumping now and check | + | :Bubba repaired SF6 leak, pumping now and check |
| + | :Test various insulators | ||
| + | :: black = bulk resistivity = shorty R28 (ordered R30, but too little resistivity so too much current draw) | ||
| + | :: white = coated with black = suffer similar resistively too low, but at least constant | ||
| + | :: white + spiral = coated with black but sand-blasted spiral (16 feet path length, so longer length of resistor) | ||
| + | :: tracking on R350 ceramic in SF6 tank possibly due to low SF6 pressure | ||
Revision as of 11:30, 11 February 2015
CEBAF Startup
Laser Program
- A = 50uA @ 125 MHz or 100uA @ 250 MHz
- B = 499
- C = 250
Laser setup
- No spare amps, 4-6 weeks from IPG for two replacement amps
- Replace 2m (FWHM~1mm) spot lens with 1.5m (FWHM~0.4mm) lens
Phase flip
- Make divider box less sensitive to EMI?
- Phase monitoring to keep phases between 3 lasers
- Analog gain switching at 250 MHz
Change the laser phase
- When we change the frequency use 0I04 viewer to check/set phase
- Command line EPICS control sufficient now, Mike Johnson still working it
- Tomas can provide a ~2ns delay cable
- John can DAC control a phase delay ~2ns
To Do
- We will learn at separators if we can flip A/D or D/A order
- We will decide by summer time a final system configuration
GTS
Recovering High Voltage
- Bubba repaired SF6 leak, pumping now and check
- Test various insulators
- black = bulk resistivity = shorty R28 (ordered R30, but too little resistivity so too much current draw)
- white = coated with black = suffer similar resistively too low, but at least constant
- white + spiral = coated with black but sand-blasted spiral (16 feet path length, so longer length of resistor)
- tracking on R350 ceramic in SF6 tank possibly due to low SF6 pressure