Difference between revisions of "GTS meeting 12 06 16"
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* High voltage processing with improved gun started on November 17th | * High voltage processing with improved gun started on November 17th | ||
| + | *[[File:High voltage processing DPP vs Barrel Polished.png]] | ||
** Improvements include: | ** Improvements include: | ||
# Black (doped alumina) R30 insulator | # Black (doped alumina) R30 insulator | ||
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# We are conditioning with SS DPP dummy wafer | # We are conditioning with SS DPP dummy wafer | ||
# Horizontal viewports are now AR coated (both surfaces), measured at <1% reflection at 532 nm | # Horizontal viewports are now AR coated (both surfaces), measured at <1% reflection at 532 nm | ||
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* [https://logbooks.jlab.org/entry/3443978 This is a link to the GTSLOG latest entry at 336kV in vacuum] | * [https://logbooks.jlab.org/entry/3443978 This is a link to the GTSLOG latest entry at 336kV in vacuum] | ||
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# Second Cs effusion source | # Second Cs effusion source | ||
# Additional Thermo Couple to calibrate both heaters | # Additional Thermo Couple to calibrate both heaters | ||
| + | ** Calibrating the top heater [[File:Puck temp cal.jpg]] | ||
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* Beam line | * Beam line | ||
| − | ** The | + | ** The slits have been assembled after Bubba had to "lap" them since the gap was not uniform. Below are the measurements done by S&A. |
| − | ** The components are being | + | ** The components are being laid out on the beam line to establish length of needed spool pieces. |
** The plan is to assemble the beam line up to the second valve, this allows running beam with two slits, two viewers, three solenoids and the insertable Faraday Cup | ** The plan is to assemble the beam line up to the second valve, this allows running beam with two slits, two viewers, three solenoids and the insertable Faraday Cup | ||
| − | ** [[File:Slit assemblies ready 01.jpg]], [[File:Slit assemblies ready 02.jpg]] | + | ** [[Media:Slits S&A gap measurements.pdf]] |
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| + | [[File:Slit assemblies ready 01.jpg]], [[File:Slit assemblies ready 02.jpg]] | ||
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| + | [[File:Slit in cross.jpg]] | ||
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| + | * Cathode solenoid magnet power supply is ready - Today, DC Power group handed it over to us. Will submit OSP by the end of this week. | ||
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| + | * Kevin Jordan is studying the damaged YAG beam line viewer crystals | ||
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| + | ** [[File:Removed damaged YAG side view.jpg]] | ||
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| + | ** [[File:Removed damaged YAG front view is bleached.jpg]] | ||
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| + | ** [[File:YAG ITVGT01.JPG|1000px|]] | ||
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| − | * | + | ** [[File:YAG ITVGT01A.JPG|1000px|]] |
Latest revision as of 16:54, 6 December 2016
- High voltage processing with improved gun started on November 17th
- Improvements include:
- Black (doped alumina) R30 insulator
- All SS electrodes, barrel polished
- Shed: Yan's design for <10 MV/m max field
- NEG modules (6 WP modules on bottom of chamber). Pre-activated in gun chamber, rinsed thoroughly to minimize dust
- Perforated plate to cover NEGs for minimizing field that can potentially lift up dust
- We are conditioning with SS DPP dummy wafer
- Horizontal viewports are now AR coated (both surfaces), measured at <1% reflection at 532 nm
- This is a link to the GTSLOG latest entry at 336kV in vacuum
- Mamun and Yan have made great progress with the photocathode preparation chamber'
- The chamber has many improvements including:
- Spring Puck retainer on top heater for adjusting the puck-efussion source gap freely,
- Ceramic insulator for biasing the puck
- Adjustable height mask
- Second Cs effusion source
- Additional Thermo Couple to calibrate both heaters
- Calibrating the top heater
- Calibrating the top heater
- Beam line
- The slits have been assembled after Bubba had to "lap" them since the gap was not uniform. Below are the measurements done by S&A.
- The components are being laid out on the beam line to establish length of needed spool pieces.
- The plan is to assemble the beam line up to the second valve, this allows running beam with two slits, two viewers, three solenoids and the insertable Faraday Cup
- Media:Slits S&A gap measurements.pdf
, 
- Cathode solenoid magnet power supply is ready - Today, DC Power group handed it over to us. Will submit OSP by the end of this week.
- Kevin Jordan is studying the damaged YAG beam line viewer crystals
