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Single cell standing wave tests data analysis Jiaru Shi Sep 27, 2011 LCWS11, Granada, Spain.
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Transcript of Single cell standing wave tests data analysis Jiaru Shi Sep 27, 2011 LCWS11, Granada, Spain.
LCWS11, Granada, Spain
Introduction
• Many single cell structures were tested at SLAC– Valery Dolgashev– To study RF breakdown with different geometries and different
materials
• Many thanks to Valery Dolgashev, Yasuo Higashi
• Analysis data of single cell SW
LCWS11, Granada, Spain
One-C-SW-A2.75-T2.0-Cu-SLAC-#1
Same surface electric field
Pin Stored energy Max E surface
Eacc
Esurface, max
Eacc
Esurface, max
X Eacc
pi-mode
LCWS11, Granada, Spain
One-C-SW-A3.75-T2.6-Cu-SLAC-#1
one-c-SW-A5.65-T4.6-Cu-Frascati-#2One-C-SW-A5.65-T4.6-Cu-KEK-#2
LCWS11, Granada, Spain
Summary plot
0.3 0.4 0.5 0.6 0.7 0.80.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
alpha
corr
2
One-C-SW-A2.75-T2.0-Cu-SLAC-#1, 19 ptsOne-C-SW-A3.75-T2.6-Cu-SLAC-#1, 28 ptsOne-C-SW-A5.65-T4.6-Cu-KEK-#2, 22 ptsone-c-SW-A5.65-T4.6-Cu-Frascati-#2, 14 ptsE acc
LCWS11, Granada, Spain
Scaling
t flat + 80ns Equiv. t pulse
Eacc (MV/m)
Std Sqrt(Sc6) Eacc (MV/m)
Std Sqrt(Sc6)
A2.75T2.0 SLAC#1 142 4.8% 2.42 139 4.8% 2.36
A3.75T2.6 SLAC#1 111 7.0% 2.3 108 6.8% 2.26
A5.65T4.6 Frascati#2 85.7 3.5% 2.06 84.7 3.8% 2.03
A5.65T4.6 KEK#2 99.1 8.3% 2.38 94.7 5.3% 2.27
Eacc scaled to tp=200ns, bdr=1e-6/pulse/m
tp^(-1/6)BDR^(1/30)