Difference between revisions of "200 kV Polarized Gun"

Revision as of 11:29, 16 January 2024

The 200 kV gun (R30-3 with spherical electrode and 18" gun HVC) was installed in CEBAF during SAD 2023.

This gun performed as designed in terms of vacuum, and high voltage: no field emission at 200 kV after conditioning with Kr to ~240 kV.
It has two problems:
- The beam waist is ~ 6 cm downstream of the GaAs wafer, compared to ~ 40 cm from the Tee electrode 14" HVC R28-2 gun operated in CEBAF for years at 130 kV.
- It was a not possible to obtain the laser retro-reflection.
The gun was then removed from the injector and replaced with the R28-2 gun.
The SAD 2024 links below capture the planning for fixing these problems in the R30-3 gun (which will be version R30-4) and for installing it in May 2024.

@@ Line 10: / Line 10: @@
 ==R30-4 200 kV Gun SAD 2024 Planning Meetings==
-* [https://jeffersonlab-my.sharepoint.com/:x:/r/personal/chgarcia_jlab_org/Documents/R30-4_CEBAF 200 kV gun ME and beam parameter space.xlsx?d=w359aaf33ac794bf282d6dc5570e99814&csf=1&web=1&e=NBBwXW R30-4 electrostatics and beam optics parameter table]
+* [https://jeffersonlab-my.sharepoint.com/:x:/r/personal/chgarcia_jlab_org/Documents/R30-4_CEBAF R30-4 ME and beam parameters space table]
 * >[https://wiki.jlab.org/ciswiki/index.php/Jan_05_2024 Jan 05, 2024]
 * >[https://wiki.jlab.org/ciswiki/index.php/Jan_10_2024 Jan 10,2024]