Inspection of STF Baseline cavity #5 and #6

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Presentation transcript:

Inspection of STF Baseline cavity #5 and #6 2008/9/3　K.Watanabe Note：These cavities are still no Vertical Test yet !!!!

History of the STF Baseline cavities #5 and #6 2008/6 : STF Baseline cavities #5 and #6 are fabricated by MHI. First inspection by using Kyoto camera was done after fabrication. 2008/7 : Pre-EP (5 um) and EP-1 (20 um), Total removed about 25 um. Second inspection by using Kyoto camera was done after Pre-EP and EP-1) 2008/8 : EP-1 (100 um), Total removed about 25 um + 100 um. Third inspection by using Kyoto camera was done after 2nd-EP-1(100um). Measurement and Analysis of the cat eye pits for STF Baseline #6 cavity. Five cat eyes were found at equator, and Three cat eyes found at iris of STF Baseline #6 cavity. STF Baseline #5 cavity will be in inspection from Sept. 15.

STF Baseline #6 cavity : #3 cell equator, Z=402mm, t=10 deg Measured line 1500 um 1mm

Comparison with each treatment #3 cell equator, Z=402mm, t=10 deg EP-1 (25 + 100 um removed) After Fabrication EP-1 (25 um removed)

STF Baseline #6 cavity : #4 cell equator, Z=516mm, t=103 deg Measured line 1500 um 1mm

Comparison with each treatment #4 cell equator, Z=516mm, t=103 deg EP-1 (25 + 100 um removed) EP-1 (25 um removed) After Fabrication

TESLA cavity Z110 and Z111 surface gradient analysis for heated spot identified by T-map

TESLA cavity Z110: #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 10mm t=297 deg group of spot for 10mm width is correspond to T-map heating location. However, other several group of spot were found in other places. 1mm 8

Z110 #8 cell equator Z=977、t=290 (2) heating point Nb metal side vac. side

surface analysis along several horizontal lines. 1 2 100 Nb metal side 199 vac. side Pixel　 200 Z-axis surface analysis along several horizontal lines.

TESLA cavity Z111: #6 cell equator #6 equator, t=193 ~ 204 deg T-map data in test 2, 16.0 MV/m t=198 deg 1.5mm Quench location #6 equator 175 ~ 225 deg t=199 deg group of spot for 1.5mm width is correspond to T-map heating location. However, other several group of spot were found in other places. 1mm 11

Z111 #6cell equator z=734,t=199, heating spot Nb metal side vac. side

surface analysis along several horizontal lines. 1 2 Nb metal side 100 vac. side 199 200 Z-axis surface analysis along several horizontal lines.

End