Difference between revisions of "200 kV Polarized Gun"

Revision as of 15:38, 9 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:
a) 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.
b) 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 2023 links below capture the planning for fixing these problems in thee R30-3 gun (which will then be version R30-4) and for installing it in May 2024.

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-* The 200 kV gun (R30-3 with spherical electrode and 18" gun HVC) was installed in CEBAD during SAD 2023.
+* The 200 kV gun (R30-3 with spherical electrode and 18" gun HVC) was installed in CEBAF during SAD 2023.
-* This gun performed was designed din terms of vacuum, and no field emission at 200 kV.
+* 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 had two problems:
+* It has two problems:
 * a) 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.
 * b) 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 2023 links below capture the planning for fixing these problems in thee R30-3 gun (which will then be version R30-4) and for installing it in May 2024.
+==SAD 2024 Planning Meetings==
+* Jan 05, 2024
+* Jan 10, 2024
 ==200 kV Gun SAD 2023 Installation Links==