Cavity status; recent KEK activities MHI-06, MHI-7, MHI-8 were vertical tested on June, July.  EP acid (1000l) was re-newed on May 15. These cavity was.

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Presentation transcript:

Cavity status; recent KEK activities MHI-06, MHI-7, MHI-8 were vertical tested on June, July.  EP acid (1000l) was re-newed on May 15. These cavity was processed by this new EP acid. (MHI-05 was 27MV/m using aged EP acid. Nb~8g/l)  MHI-06 22MV/m stopped by RF cable trouble. (stain)  MHI-07 16MV/m stopped by field emission. (stain)  MHI-08 16MV/m stopped by cell heating. (black object at equator weld edge) The EP procedure test using old MHI 9 cell cavity (MHI-#0) : Hayano *MHI-05,06,07,08,09 are S1G candidates.

BL#6 1-cell equator, t = 306 deg. Downstream : Outside weld area BL#6 #9-BP, t = 241 deg. -1 BL#6 #9-BP, t = 241 deg. -2 Brown spot and traces; MHI-06 ： spot or traces on BP-#1 、 #1 、 #2 、 #3 、 #4 、 #8 、 #9 、 #9-BP (red indicate bad) MHI-07 ： BP-#1 、 #1 、 #2 、 #3 、 #4 、 #5 、 #6 、 #7 、 #8 、 #9 、 #9-BP Kyoto-camera picture examples using new LED illumination

BL#6 9-cell equator, t = 034 deg. Upstream : Outside weld area BL#6 3-cell equator, t = 291 deg. BL#6 3-4 iris, t = 055 deg. BL#6 8-9 iris, t = 053 deg. BL#6 9 equator, t = 037 deg. BL#6 9-cell equator, t = 184 deg. Upstream : Outside weld area

heating spot

Tested EP Parameter using MHI-#0 (9cell cavity) (1) Nominal STF-EP Parameter for check -> stain exist (2) Idling rotation after EP current stop, 5min ->30min ->stain exist (3) Low voltage EP ~15V(half current density EP) -> stain exist (4) 1 rotation/min -> 3 rotation/min ->stain exist (5) 15litter/min -> 20litter/min acid flow rate ->stain exist (6) more fast acid dump out from cavity will be tried, next.