Difference between revisions of "Apr 17 2024"
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* The electrode front end pieces 16-30 deg and 16-60 deg, two pieces each manufactured from 316 VAR SS have been polished in the SRF tumbler, UHV cleaned in the Chem room, and are being vacuum degassed in the vacuum furnace room. They will be ready for assembly this Friday. | * The electrode front end pieces 16-30 deg and 16-60 deg, two pieces each manufactured from 316 VAR SS have been polished in the SRF tumbler, UHV cleaned in the Chem room, and are being vacuum degassed in the vacuum furnace room. They will be ready for assembly this Friday. | ||
* Gun layout drawings comparing z position of R28-2 and R30-3[[File:Haysg SKETCH -JL0091130-0100-SECTION 01-PHOTO-GUN TO VBV2102.pdf|right|middle|thumb]] | * Gun layout drawings comparing z position of R28-2 and R30-3[[File:Haysg SKETCH -JL0091130-0100-SECTION 01-PHOTO-GUN TO VBV2102.pdf|right|middle|thumb]] | ||
| − | * The electrode | + | * The electrode has been removed from the high voltage chamber, and Moly puck with GaAs bulk wafer engagement checked. Compared to the spare Tee electrode small shield (R28-4), the puck engagement feels and sounds weaker. The puck retainer roller spring push the puck against the back of the Pierce electrode piece. :[https://logbooks.jlab.org/entry/4278817 R30-gun laser retro-reflection checks in LERF clean room performed April 12 2024] |
| + | * The electrode has been disassembled. One puck retainer roller spring was found to be bent slightly outwards near the sapphire roller, one other retainer was found to be bent also slightly outwards near its base, and only one retainer was found to be straight. | ||
==Schedule Discussion== | ==Schedule Discussion== | ||
Revision as of 12:42, 16 April 2024
Updates
- The electrode front end pieces 16-30 deg and 16-60 deg, two pieces each manufactured from 316 VAR SS have been polished in the SRF tumbler, UHV cleaned in the Chem room, and are being vacuum degassed in the vacuum furnace room. They will be ready for assembly this Friday.
- Gun layout drawings comparing z position of R28-2 and R30-3File:Haysg SKETCH -JL0091130-0100-SECTION 01-PHOTO-GUN TO VBV2102.pdf
- The electrode has been removed from the high voltage chamber, and Moly puck with GaAs bulk wafer engagement checked. Compared to the spare Tee electrode small shield (R28-4), the puck engagement feels and sounds weaker. The puck retainer roller spring push the puck against the back of the Pierce electrode piece. :R30-gun laser retro-reflection checks in LERF clean room performed April 12 2024
- The electrode has been disassembled. One puck retainer roller spring was found to be bent slightly outwards near the sapphire roller, one other retainer was found to be bent also slightly outwards near its base, and only one retainer was found to be straight.
Schedule Discussion
- R30-4 200 kV SharePoint site
- ATLis/ePAS one encompassing ATLis or break down in major jobs?
