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2010.05.18: Hayano. Cavity status; recent KEK activities. S0 cavities; MHI010, MHI011 are on a way of EP-VT , result will be later this week. (1) KEK-Hitachi collabration , KEK-Toshiba collaboration on cavity development;

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slide1

2010.05.18: Hayano

Cavity status; recent KEK activities

S0 cavities; MHI010, MHI011 are on a way of EP-VT , result will be later this week.

(1)KEK-Hitachi collabration, KEK-Toshiba collaboration on cavity development;

9-cell cavity with no HOM couplers, but Input-port and monitor-port.

Inspection was done, RF measurement are on-going

Welding seam; Hitachi is fairly good,

Toshiba has pits and bumps mainly on cell#1.

(2)KEK-FNAL collaboration; on molding

Bumps replica of AES001 taken at FNAL during TTC were analyzed

by using profiler micro-scope. (bumps are heating spot at 22MV/m)

(3) KEK-JLAB collaboration; JLAB LG-01 for local grinding

local grinding and 50um EP finish were over.

Then molding again and found grinding edge has still little bit sharp.

We will have more grinding on edge.

(4) KEK-Saclay collaboration; on 1DE1 single cell sponge-wipe possibility

STF-EP system create brown stains on iris, source of field emission maybe.

we tried 7 times of EP with different water-rinse condition, not yet solved.

slide2

Toshiba 9-cell cavity

Hitachi 9-cell cavity

aes 001 3 cell equator t 169 1 deg
AES#001 3-cell Equator, t=169-1 deg.

Z-axis

H-field

H-field

EBW seam

To 0deg

aes 001 3 cell equator t 169 1 deg profile
AES#001 3-cell Equator, t=169-1 deg.:Profile

Z-axis

Theta

H-field of TM010

Surface gradient:41 degree. and 33 degree

Kyoto-camera could only measure surface gradient less than 22degree. So it could not measure.

aes 001 3 cell equator t 169 2 deg
AES#001 3-cell Equator, t=169-2 deg.

this is fake measurement

Z-axis

H-field

H-field

EBW seam

To 0deg

STF

aes 001 3 cell equator t 169 2 deg profile
AES#001 3-cell Equator, t=169-2 deg.:Profile

Z-axis

Theta

H-field of TM010

Surface gradient: 27 degree. and 34 degree

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