Difference between revisions of "Apr 17 2024"
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(Created page with "==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 C...") |
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==Updates== | ==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 vacuum degassed | + | * 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 Thursday. |
| − | * 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. | ||
| + | * Puck engagement was tested on R28-4 and found to set the puck more firmly than the R30-3 assembly. The puck retainer roller springs are straight, and were removed to replace those in R30-3. These will bee mounted and tested today. | ||
| + | * 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]] | ||
==Schedule Discussion== | ==Schedule Discussion== | ||
| + | |||
* [https://jeffersonlab.sharepoint.com/:f:/s/CIS/Ejp9S0WdeXtPgFm_bwwkuEAB0gEzYKg7Ci0UfKK8qQnPfQ?e=1tfGAH R30-4 200 kV SharePoint site] | * [https://jeffersonlab.sharepoint.com/:f:/s/CIS/Ejp9S0WdeXtPgFm_bwwkuEAB0gEzYKg7Ci0UfKK8qQnPfQ?e=1tfGAH R30-4 200 kV SharePoint site] | ||
| + | * ATLis/ePAS one encompassing ATLis or break down in major jobs? | ||
| + | |||
| + | ==Pictures== | ||
| + | |||
| + | * [[File:R30-4 gun elecctrode front end pieces after barrel polishing top view.jpg]] | ||
| + | * [[File:R30-4 gun elecctrode front end pieces after barrel polishing iso view.jpg]] | ||
=<br />= | =<br />= | ||
[https://wiki.jlab.org/ciswiki/index.php/200_kV_Polarized_Gun Return to 200 kV Gun page] | [https://wiki.jlab.org/ciswiki/index.php/200_kV_Polarized_Gun Return to 200 kV Gun page] | ||
Latest revision as of 08:37, 17 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 Thursday.
- 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.
- Puck engagement was tested on R28-4 and found to set the puck more firmly than the R30-3 assembly. The puck retainer roller springs are straight, and were removed to replace those in R30-3. These will bee mounted and tested today.
- Gun layout drawings comparing z position of R28-2 and R30-3File:Haysg SKETCH -JL0091130-0100-SECTION 01-PHOTO-GUN TO VBV2102.pdf
Schedule Discussion
- R30-4 200 kV SharePoint site
- ATLis/ePAS one encompassing ATLis or break down in major jobs?
