AES 001 summary 84m height bump 60m height

AES 001 summary 84µm height bump 60µm height bump ~21 mm 43µm height bump AES 01 has hard quench at 15 MV/m, its location was identified by Cernox at FNAL. 5 4 8 1 7 6 2 Kyoto-camera found 3 spots in their exact location 3

AES 001 (1) a=~100 um (height) b=250 um (HWHM) As received 15 MV/m No. 3 cell Equator θ = 168 deg after STF EP 20 um a=~70 um b=350 um 22 MV/m No. 3 cell Equator θ = 168 deg

AES 001 (2) a=~65 um (height) b=325 um (HWHM) As received 15 MV/m No. 3 cell Equator θ = 169 deg after STF EP 20 um a=~85 um b=325 um 22 MV/m No. 3 cell Equator θ = 169 deg

AES 001 (3) a=~45 um (height) b=200 um (HWHM) As received 15 MV/m No. 3 cell Equator θ = 176 deg after STF EP 20 um a=~45 um b=200 um 22 MV/m No. 3 cell Equator θ = 176 deg

AES 003 (1) 1 -cell equator, t=200 degree 96 Plotted line Z-axis a=~70 um (height) b=400 um (HWHM)

AES 003 (2) 4 -cell equator, t=306 degree 96 Plotted line Z-axis a=~80 um (height) b=~200 um (HWHM) Heating Spot (No. 4 cell) 20 MV/m

AES 003 (3) 5 -cell equator, t=187 degree 100 Plotted line Z-axis a=~60 um (height) b=~400 um (HWHM)

AES 003 T-map @JLAB ~600µm size, bump Bump location by Optical inspection AES 3 cell#4 T-map at Jlab 20 MV/m Heating spot by T-map at Jlab

Z 110: #8 cell equator #8 equator, t=288 ~ 299 deg T-map data in test 2, 14. 2 MV/m t=292 deg Quench location #8 equator 250 ~ 300 deg 10 mm t=297 deg 1 mm group of beads(? ) with 10 mm wide were observed. Similar beads group were also observed in several places. see following slides. 18

Inspection of Z 111: #6 cell equator #6 equator, t=193 ~ 204 deg T-map data in test 2, 16. 0 MV/m t=198 deg 1. 5 mm Quench location t=199 deg #6 equator 175 ~ 225 deg 1 mm group of beads(? ) with 1. 5 mm wide were observed.

ピット部分の凹凸解析 Niobium side Z 111 #6 cell equator z=734, t=199, heating spot identified by T-map vacuum side

Recent DESY SEM analysis of cut-out from Z 111 空洞からピット部分を切り出し、電子顕微鏡にかけて解析 30 um edge r = ~2 um? ? W. Singer. ILC Cavity Group 9 th Meeting. January 27 th 2009 SEM. Quench location Cell #6 199 degree

Vertical Test of #1, #2, #3, #4 Cavities 14 tests for 1 year (Feb. 2006 ~Feb. 2007) E. KAKO (KEK) 2009' June 10

Eacc, max in each cell of 4 cavities MHI-01 Cavity Quench MHI-03 Cavity Quench ? p mode; Eacc, max = 20. 8 MV/m p mode; Eacc, max = 20. 5 MV/m MHI-02 Cavity MHI-04 Cavity Quench p mode; Eacc, max = 29. 4 MV/m * p mode; Eacc, max =17. 1 MV/m E. KAKO (KEK) 2009' June 10