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PRODUCTION STATUS OF ACCELERATOR COMPONENTS
N. Shigeoka, M. Kimura, S. Miura, K. Okihira Mitsubishi Heavy Industries, Ltd. (MHI)
Mihara, Hiroshima, 729-0393, Japan
Introductions
Mitsubishi Heavy Industries (MHI) has started manufacturing of accelerator components such as accelerating structures in 1960s. For example, in a field of normal conducting accelerator, in recent years, MHI had handled mass production of C-band choke-mode accelerating structures and SLED for Riken SACLA, production of DTL, SDTL (Separated DTL), ACS (Annular Coupled Structure) for JAEA/KEK J-PARC. In latest years, MHI manufactured over 120 S-band accelerating structures for PAL-XFEL and shipment has completed in March 2015. In addition, MHI has accepted order of C-band waveguide network prototype (CWNP) for SwissFEL project in June 2014 and has been already delivered to PSI in December 2014. MHI also has been accepted order of 26 C-band waveguide network series (CWNS) and the production of them is in progress now.
C-band waveguide network for SwissFEL One waveguide network provides RF power from one klystron to four accelerating structure. Six directional couplers for RF monitor, three RF splitters and nine vacuum ports are included in one unit.In order to precisely fit to input flange of each accelerator structure, dimension accuracy between four interface flanges are 0.2 mm CWNP had been already installed in the test facility and high power test of the CWNP by PSI is planned. Production of CWNS (approximately 500 waveguides) has been started. First 4 units of the CWNS have been already delivered to PSI in
August 2015.
S-band accelerating structures for PAL-XFEL Mass-production of the S-band 3 m long accelerating structure started in June 2012 and finished at March 2015. Totally 120
structures has been delivered to PAL. Results of LLRF measurement after tuning shows excellent performance of production.
Appearance of the structure Frequency 2856 MHzAccelerating Type C.G.Phase Shift per Cavity 2π/3Unloaded Q 13000Attenuation Constant 0.56Input / Output VSWR < 1.05Phase error < 2.5 degreeNumber of Cells 82 + 2 Coupler CellsFilling Time 0.84 μsLength 3 mCoupler Type Quasi-symmetrical type
Main parameters
Schematic of H-plane splitter
Result of LLRF measurement
0
0.5
1
1.5
2
2.5
1
1.01
1.02
1.03
1.04
1.05
1.06
1.07
#000 #020 #040 #060 #080 #100 #120
Cum
ulat
ive
phas
e er
ror [
deg]
VSW
R
Production number
Input VSWROutput VSWRCumulative phase error
Symmetry error of splitters
0
0.5
1
1.5
2
2.5
3
3.5
00.010.020.030.040.050.060.070.080.09
0.1
Sym
met
ry e
rror
(pha
se) [
degr
ee]
Sym
met
ry e
rror
(am
plitu
de) [
dB]
Component
Symmetry error (amplitude) [dB]
Symmetry error (phase) [degree]
threshold of symmetry error (phase)
threshold of symmetry error (amplitude)
CWNP CWNS
Residual gas analysis (RGA)
1 10 20 30 40 50 60 70 80 90 100Mass [amu]
2.2E-10
1.8E-10
1.4E-10
1.0E-10
6.0E-11
2.0E-11
Cur
rent
[A]
H2+ H2O+
N2+
CO2+
Overview of the waveguide network (series production for LINAC 1
~6.1 m
~7.2 m
Dimension accuracy: 0.2mm
Horizontal waveguide
Vertical waveguide
Outgassing rate measurement
2.0E-08
4.0E-08
6.0E-08
8.0E-08
1.0E-07
Vertical(CWNP)
Horizontal 1(CWNP)
Horizontal 2(CWNP)
1st shipment(CWNS)
Out
gass
ing
rate
[Pa
m3 /(
sm
2 )]
Waveguide
threshold of outgassing rate
Main parameters Bandwidth 5712 ± 20 MHzPeak power 320 MW*Average power 15 kWPulse repetition rate 1-100 HzVSWR < 1.04Operating pressure < 1x10-6 PaWaveguide size WR187Flange type C-band A-DESY
Coupling of the RF monitor-60 ± 2 dB(5712 ± 3 MHz)
Directivity of the RF monitor> 25 dB(5712 ± 20 MHz)
RF symmetry error of splitters< 0.1 dB in amplitude< 3° in phase
RF leak to vacuum manifold < -85 dB
Residual gas analysis(RGA)
The RGA spectrum must showno evidence of hydro carbonsand the peaks > 40 Amu(excluding peak 44) should be
0.1%Outgassing rate < 1.0 10-7 Pa m3/( s m2 )*Maximum power in between the pulse compressor and the 1st splitter
WEP038
Schematic of RF monitor
Definition:Coupling: S31 (-60 2 dB) Directivity: S31 - S32 (> 25 dB)
20
25
30
35
40
45
50
55
60
-62
-61.5
-61
-60.5
-60
-59.5
-59
-58.5
-58
0 5 10 15 20 25 30 35
Dir
ectiv
ity [d
B]
Cou
plin
g [d
B]
Monitor No.
Coupling [dB]
Directivity [dB]
threshold of directivity
permissible range of coupling
CWNP CWNS
Coupling and directivity of RF monitors