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High power RF test of C-band rf mass-production components 8 GeV at XFEL/SPring-8
Tatsuyuki Sakurai1,A,B), Takahiro InagakiA,B), Chikara Kondo A,B), Katsutoshi ShirasawaA,B), Shinsuke SuzukiA),
Tsumoru ShintakeB) A) XFEL/JASRI
1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148 B) XFEL/RIKEN
1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148
Abstract
We report the high power rf test results of C-band accelerator system for X-ray free electron laser (XFEL) in SPring-8 site. In XFEL main accelerator, 64 C-band systems will be used in total, whose components have already finished mass production. We performed the high power RF test with three sets of the mass-produced components in XFEL test bunker. We operated the C-band components with the accelerating gradient, as high as 42 MV/m. We measured the high voltage breakdown rate and the dark current emission.
1 E-mail: t-sakura@spring8.or.jp
1 XFEL
!
XFEL
Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (August 4-6, 2010, Himeji, Japan)
-836-
4 C-band
-354kV
4 RF
RF RFRF
RF 48MW
2.5 µsec RF
RF 2 µsecRF RF
RF 280 MW
Filling time(300 nsec)RF 3dB10
RF IQ5
XFEL35 MV/m
42 MV/m
5
1620 mm,
170 mm6
6
10
15
20
25
30
35
40
45
0 10 20 30 40 50
Accelerating Gradient of C-band
Acc
eler
atin
g G
radi
ent [
MV
/m]
Klystron output RF [MW]
��������������35 MV/m
42 MV/m
0
10
20
30
40
50
60
30 32 34 36 38 40 42
110 hours170 hours220 hours330 hours470 hours
Dar
k cu
rren
t em
issi
on [p
C/p
ulse
]
Accelerating gradient[MV/m]
Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (August 4-6, 2010, Himeji, Japan)
-837-
60 Hz110 RF 2.5 µsec
40 MV/m 57 pC/pulse 350
470 40 MV/m 35 pC/pulseXFEL
300 pC/pulse C-band 64
3 GeV 8 GeV2
C-band
7200
50 70
36 MV/m
200 39 MV/m
40
35 MV/m
7 C-band
XFEL/SPring-8 RF
RFQ
2
97 kHz 18 RF
[10]RF
8
RF
8
9 8 RF
3029.7 1RF 8% XFEL 64
RF
9 RF
0
4
8
12
16
20
36 37 38 39 40 41
Fau
lt ra
te [C
ount
/day
]
Accelerating gradient [MV/m]
After 200hours
0
0.1
0.2
0.3
0.4
0.5
0.6
2000 2500 3000 3500 4000 4500 5000
Am
plitu
de [V
]
TIME[nsec]
0.5
0.52
0.54
0.56
4000 4050 4100 4150
180
185
190
195
200
28 28.5 29 29.5 30 30.5 31 31.5
SLE
D p
eak
RF
pow
er [M
W]
Tempurture on the SLED cavity surface [degree Celsius]
Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (August 4-6, 2010, Himeji, Japan)
-838-
XFEL C3
42 MV/mXFEL 35 MV/m
500
201010 RF
XFEL
SES
[1]T.Shintake.et.al, “Status report on Japanese XFEL construction project at SPring-8”, IPAC10, 2010.
[2]T.Shintake et al, “The First Wakefield Test on the C-band Choke-mode accelerating structure.”, PAC’99, 1999.
[3] C
[4]T.Shintake et al, ”Development of C-band RF PulseCompressor System for the e+e- Linear Collider.”, PAC’97, 1997.
[5] C RF
[6]Y.Ohkubo et, al, “The C-band 50 MW Klystron usingTravelling-wave Output Structure”, LINAC’98, 1998.
[7]T.Shintake.et.al, “Compact klystronmodulator for XFEL/SPring-8”, IPAC10, 2010.
[8] XFEL/SPring-8RF
[9]T.Sakurai.et.al, “High power RF test on the mass-produced C-band RF components for XFEL/SPring-8”, IPAC10, 2010.
[10]T.Hasegawa.et.al, ”Status of a precise temperature-regulation system for the C-band accelerator at XFEL/SPring-8” , IPAC10, 2010.
Proceedings of the 7th Annual Meeting of Particle Accelerator Society of Japan (August 4-6, 2010, Himeji, Japan)
-839-
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