data analysis Jiaru Shi Sep 27 2011 LCWS11 Granada Spain Introduction Many single cell structures were tested at SLAC Valery Dolgashev To study RF breakdown with different geometries and different materials ID: 376302
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Slide1
Single cell standing wave testsdata analysis
Jiaru ShiSep 27, 2011
LCWS11, Granada, SpainSlide2
Introduction
Many single cell structures were tested at SLACValery DolgashevTo study RF breakdown with different geometries and different materialsMany thanks to Valery Dolgashev,
Yasuo
Higashi
Analysis data of single cell SW
LCWS11, Granada, SpainSlide3
Note:
To calculate field from recorded input power
LCWS11, Granada, SpainSlide4
Note:
[SLAC-R-577]
Pulsed surface heating, 1D solution
New quantity:
LCWS11, Granada, SpainSlide5
One-C-SW-A2.75-T2.0-Cu-SLAC-#1
Same surface
electric field
Pin
Stored energy
Max E surface
E
acc
E
surface
, max
E
acc
E
surface
, max
X
Eacc
pi-mode
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Equivalent pulse width
Equivalent square pulse: same max
(I
α
)
LCWS11, Granada, SpainSlide8
600ns
flat
200ns
flat
400ns
flat
150ns
flat
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Plot corr^2
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One-C-SW-A3.75-T2.6-Cu-SLAC-#1
one-c-SW-A5.65-T4.6-Cu-Frascati-#2
One-C-SW-A5.65-T4.6-Cu-KEK-#2
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Summary plot
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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%
2.0684.73.8%2.03A5.65T4.6 KEK#2
99.18.3%2.38
94.75.3%
2.27Eacc scaled to tp=200ns, bdr=1e-6/pulse/m
tp^(-1/6)
BDR^(1/30)LCWS11, Granada, SpainSlide17
Summary
BDR .v.s. (W --- stored energy)Best alpha between 0.5 ~ 0.7 for this four structure. (0.5 for pulsed surface heating)
Equivalent pulse width calculated for standing wave structure with relatively long rising time
More structures.
New function?
LCWS11, Granada, Spain