Difference between revisions of "GTS meeting 5 31 16"
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(Created page with "* We ran beam for RadCon Surveys ** 300 kV beam on the dump! ** File:GTS 1p6 uA 300keV beam at Dump.jpg ** The laser variable attenuator is not working, so we started to...") |
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* We ran beam for RadCon Surveys | * We ran beam for RadCon Surveys | ||
| − | ** | + | ** [https://logbooks.jlab.org/entry/3407216 300keV DC beam 1.6 uA on the Dump] |
** [[File:GTS 1p6 uA 300keV beam at Dump.jpg]] | ** [[File:GTS 1p6 uA 300keV beam at Dump.jpg]] | ||
** The laser variable attenuator is not working, so we started to steer beam through the viewers, but seems the beam is too intense. | ** The laser variable attenuator is not working, so we started to steer beam through the viewers, but seems the beam is too intense. | ||
** Yan steered the beam to the dump, which reportes 1.6 micro-Amps! This made the vacuum increase from 1E-11 Amps, to about 1E-6 Amps when the beam was at each viewer. | ** Yan steered the beam to the dump, which reportes 1.6 micro-Amps! This made the vacuum increase from 1E-11 Amps, to about 1E-6 Amps when the beam was at each viewer. | ||
** Shukui has a plan to have full control of the laser output power and variable attenuator. It involves setting up a PC in the GTS, and a new ThorLabs variable attenuator wheel. | ** Shukui has a plan to have full control of the laser output power and variable attenuator. It involves setting up a PC in the GTS, and a new ThorLabs variable attenuator wheel. | ||
| + | ** William Lu is working on getting the beam dump Kethley signal to EPICS | ||
** First we ran at 275kV, then at 300kV, stable! | ** First we ran at 275kV, then at 300kV, stable! | ||
**See this link for the Log entry | **See this link for the Log entry | ||
| + | ** Oh! The electricians wired up a GTS enclosure light switch! it works! | ||
| + | |||
| + | * What do we do next! | ||
| + | ** Yan points out that emittance measurements will be very difficult, if not impossible, because the solenoid is not counter wound. | ||
| + | ** Want a camera on top viewport to look at laser spot on the cathode | ||
| + | ** Align beam on solenoids, perhaps need to physical adjust the first solenoid mount. | ||
| + | ** Need to write a beam measurements and cathode lifetime studies plan. | ||
| + | |||
| + | * Before going to higher beam current, Need to short out the conditioning resistor. | ||
| + | ** At 1 micro-Amps beam current, the voltage drop on the cathode is already 0.3 kV, at 100 micro-Amps it will be 30 kV!!! because the resistor is 300 Mega-Ohms. | ||
| + | ** We should let Shukui take the time to give us full control of the laser power and attenuator. | ||
| + | |||
| + | * What else?.... | ||
Revision as of 11:53, 31 May 2016
- We ran beam for RadCon Surveys
- 300keV DC beam 1.6 uA on the Dump
- The laser variable attenuator is not working, so we started to steer beam through the viewers, but seems the beam is too intense.
- Yan steered the beam to the dump, which reportes 1.6 micro-Amps! This made the vacuum increase from 1E-11 Amps, to about 1E-6 Amps when the beam was at each viewer.
- Shukui has a plan to have full control of the laser output power and variable attenuator. It involves setting up a PC in the GTS, and a new ThorLabs variable attenuator wheel.
- William Lu is working on getting the beam dump Kethley signal to EPICS
- First we ran at 275kV, then at 300kV, stable!
- See this link for the Log entry
- Oh! The electricians wired up a GTS enclosure light switch! it works!
- What do we do next!
- Yan points out that emittance measurements will be very difficult, if not impossible, because the solenoid is not counter wound.
- Want a camera on top viewport to look at laser spot on the cathode
- Align beam on solenoids, perhaps need to physical adjust the first solenoid mount.
- Need to write a beam measurements and cathode lifetime studies plan.
- Before going to higher beam current, Need to short out the conditioning resistor.
- At 1 micro-Amps beam current, the voltage drop on the cathode is already 0.3 kV, at 100 micro-Amps it will be 30 kV!!! because the resistor is 300 Mega-Ohms.
- We should let Shukui take the time to give us full control of the laser power and attenuator.
- What else?....