Transcript Document 7497066

150 MeV FFAG
T. Adachi, M. Aiba, K. Kikuchi, K. Koba, S. Machida, Y. Mori,
R. Muramatsu, A. Muto, C. Ohomori, T. Sakae, I. Sakai,
Y. Sato, M. Sugaya, T. Shibata, A. Takagi, R. Ueno,
T. Yokoi, Y. Yonemura, M. Yoshii, M. Yoshimoto,
Y. Yuasa and Joe Nakano
- 150MeV FFAG group June 6, 2003
Nu Fact@Columbia Univ. NY
Contents
Present status of 150MeV FFAG Accelerator
–
–
–
–
Introduction of FFAG
Schematic drawing of 150 MeV FFAG
Parameter
Magnet, RF, etc…
Introduction - Characteristics
Fixed Field
of FFAG
flexibility, easy operation, large beam current, low power consumption
FFAG magnetic Field : B=B0(r0/r)k
Satisfying the cardinal condition, “zero–chromaticity” Scaling FFAG
High repetition rate
Super conducting magnet
Alternating Gradient Accelerator
strong focusing, down sizing
Compact size ( cf. Cyclotron)
Large Horizontal acceptance
wide aperture
Large momentum acceptance
FFAG has characteristics becoming to the large intensity proton driver and the
manipulator of secondary beam; PRISM, Muon Accelerator.
The design of Neutrino factory, Japanese group proposes, based on scaling FFAG ring.
Introduction-150 MeV FFAG project
•
•
FFAG was proposed by Ohkawa, Symon and Kolomensky. (~50’s)
An electron FFAG at MURA project in the 50’s
PoP FFAG
the first proton FFAG in the world
In June 2000, Our PoP FFAG accelerated the proton beam successfully.
… confirming the acceleration can be done in 1msec.
150 MeV FFAG project the second proton FFAG
The project to construct a practical machine was started.
feasibility study for scaled-up FFAG Accelerator
ex.) Construction of large FFAG ring
Fabrication of Yoke-Free Magnet and large aperture RF system
Demonstrating the beam acceleration and extraction in high reputation rate
Establishment of injection and (FAST) extraction scheme
150MeV FFAG
– Schematic view
KEK-PS East Counter Hall
FFAG
Control Room
FFAG Schematicview
Beam
Dump
P.S.
FFAG magnet
RF
Ext.
B-Septum
P.S. for Ext.
B-Septum
Straight
Chamber
Beam profile
monitor
Cyclotron
Bump magnet
Beam
transport
B-Septum
FFAG
Magnet
E-Septum
Current Monitor (CT)
Kicker magnet
Kicker power supply
Mag.
Septum
Cyclotron
Bump
Beam
transport
Mag.
Septum
12MeV Proton
Bump
E-Septum
150MeV Proton
Kicker
magnet
150MeV FFAG
Cyclotron Parameters
Energy
: 12MeV
Field
: 1.69T
Current(full)
: 25μA
RF Freq.
: 50Mhz
Dee Voltage pulse width
: 160μsec@250Hz
Extraction Current : 0.5μA
(Current in Cyclotron : 2μA）
（ Deflector loss
:1.5μA)
Dee Voltage with Gate pulse
80μsec
160μsec
4msec
–Parameter
150MeV FFAG Parameters
250Hz (by 2 RF system)
Revolution Freq. : 1.5Mhz-4.6Mhz
Bump Decay time: 6.6μsec
Current
: 40 nA
(limited by shield thickness)
RF peak voltage: 19kV (by 2 RF system)
150 MeV FFAG
– scaling FFAG
• 150 MeV FFAG is a scaling FFAG.
BL-F/D ratio vs. radius
Tune vs. mean radius
excursion
Tune diagram
Design satisfy the zero-chromaticity.
CI
71 BW
86
76
BS 75
chci
bv
87
bs BX
BV
CN
80 cf
95
74
CB
cb
bu bx
77
72
CI CL
BT
BU
bt
cl
90
73 BY
80
CB
78
cb
7
9
CA
CQ
cj
caCC
BZ
81
by
77
bz cc
ci 92
CC
cq
82 cg
CD
91
88
ck
cd
bu
CM
150 MeV FFAG
dB/B
140 EL
gh
es
EQ
147
DW
DX
133
144
F Sector
dB/B (%)
0.50
0.25
Flat field of F
0.00
-0.25
Flat field of D
-0.50
-0.75
-1.00
145
EO
(measured-TOSCA)/TOSCA
0.75
EU
es
CE ch
ch
87
88
ca
83
74
82
ED
gx
EA
DY
CHCJ
CIcj
ES
151
gz
86ci
ek
149
-140 -120 -100 -80 -60 -40 -20
CA
dy eg
D coil
FD
- Return Yoke Free Magnet
1.00
D Sector
149
CK
CG CJ
EC
83 CJ
127
CE
EN
cm
EM
ce
89cm
CS
EY
cs
ea
155
EC
cj
81
88 CM
143
dx 133
ec
85
EG emeq
97
137
91 cr
155
CR
89
gjEJ
EP
146
EY
88
el 148
EM
EE 141
ey
dv
84
135
cq
CQ
es ey
96
EK
143
150
CF ci
CJ
153
135
eu
CICK
EE ek ES
95
EUey
240
238
137
236
230
EW
232
234
81 cf 87
cp
228
co
en
er
226
ee ei eo
eq151
224
cj cl CP
222
ep
220
DV
149ew
218
94 98
EY
138
CO
216
FA
ew
214
157
CT
BY
212
etER
EQ
cp
210
208
EA EI143 EW
206
CL 93
ck
CP
EG eo 155
204ej
202
ct
CJ
147153fa
200
95
cj 90 CQ
198
EM
92
FA
EO 157
fa
196152
cn cq
96
gl
157
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FA
194
IF
fa
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cq
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ID
126
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IB
85
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HX
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CN
190
em
HV ET
eg em 155
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cf 88CL 95
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cb
CN
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HP
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cr
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HB
123
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w
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205
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HA
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h
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he
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209
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ce
213
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128
215
217
219
fz
DU
221
223
225
227
229
235
231
dy
237
du
233
239
d
v
gt
129
CH
DY
DVDX
gb
dx
gr
126
133
ck
gp
gd
eu
gf
gv
CK
gn
89
gl
153
gh
gj
• “Return Yoke Free Magnet ” The return
yoke of Focusing sector is removed.
Shunt
ew
ES
128
dw ee
ec
78 CD
F coil
BV
x (cm)
Radial end field
hb
ed
hd
eq
FJ
131
hf
hh
79
cd
cd
cg
hj
CG
EQ
hl
Deviation between Measurement
and TOSCA design is within 0.3%
in flat field area.
85
BZ
hn
hp
EG
ΦF: B in F Sector
ΦD: B in D Sector
ΦS: B in Shunt
hr
CD
ht
hv
hx
hz
id
if
ib
83
bv
82
bz
CE
84
CF
cf
147
ce
FL
Alignment of the maget
We aligned the magnets within
the precision of 0.2 mm.
Cyclotron(Injector) and Beam transport
Cyclotron
•10 MeV proton beam
•250Hz pulse operation
• Max. extraction current 0.5μA
Transport
2 sets of steering+triplet Q
mag.
Beam Injection Study
10MeV(137MeV/c) proton Injection Study with Magnetic
and Electric Septum
Electric Septum
Magnetic Septum
60deg
30mm
22mm
450mm
Magnetic field 1T for 10MeV proton
ρ~450mm
E=35kV/cm
Deflecting angle ~80mrad
Distance between electrode 22mm
Beam Injection Study
With Magnetic and Electric Septum
~25nA
60nA
30nA
~25nA
we are studying the
beam orbit in detail, and
installing the bump
magnets for the beam
acceleration
25th April 2003
First circular beam was measured
in 150MeV-FFAG Synchrotron Accelerator.
RF system
Large Magnetic Alloy (FINEMET) Cavity
Number of core 4 pieces
Outer (Inner) size 1700x950mm(980x230mm)
Core thickness
25mm
RF frequency
1.5 – 4.6 MHz
RF voltage
9kV
RF output
55kW
Power density
1W/cm3
Cooling water
70 L/min
Cavity Impedance
350
300
Z [Ohm]
250
200
150
100
acceleration
0
freq 5
0
50
10
15
Frequency [MHz]
Measured Impedance
20
Summary
• We finish the construction of 150 MeV FFAG ring, and
starting the beam study.
• We observed the circulating beam of one turn with Faraday
Cup with Magnetic and Electric Septum on.
the next …..
• We are now studying the injection beam orbit in detail, to
confirm the FFAG ring satisfying our design.
• After installing a set of bump magnets, beam acceleration
will be started.
150 MeV FFAG
– The design of
the magnet pole
• The design of the edge of
the F-sector pole
Focusing sector
w/o patch
Defocusing sector
• The final design of the poles
 5400
halfgap 21

r


7.75
9.32
 5400
halfgap 20

r


(r  4500～4900)
11.555
 4900
halfgap 39.9

r


 9.57
(r  4900～5400)
with patch
with patch
w/o patch
Magnetic field in the center of sectors
BL
BL-F/D ratio vs. radius
A comparison of Magnetic field in
the focusing sector
FFAG Magnet alignment
三角測量による設置
精度10秒のトランシットを用いた。
三角一辺の長さ ~2m
10秒=0.000048
∴ 0.1mm程度の設置精度
ビームライン中心線
CODが要求する0.5mmの設
置精度に対し、約0.2mm程度
の精度で設置を完了した。
Measurement of Magnetic field
7000
half cell
Alignment error ~0.2mm
y (mm)
6000
5000
extraction energy
injection energy
4000
3000
-2000
-1000
0
1000
2000
x (mm)
All area of half cell, where the beam pass through, is covered
by moving the measurement bench.
Calibration of FFAG magnet
Measured field with various F & D current
F 883.7A
Measured Bz
@ Defocus (Gauss)
4300
D 1080 A
measure
design
D 880 A
4200
deviation!
4100
4000 D 1042.3A
D 1300 A
D 780A
D 680 A
Design (125MeV mode)
F: 910A / D: 780A
F 910A
3900
F 885 A
F 860 A
3800
6600 6700
6800
6900
7000
Measured Bz
@ Focus (Gauss)
Coil
F: 50 turn
D: 5 turn
7100
Measured field magnitude (not shape) deviates
a little from design value.
Trimmed
F: 883.7A / D: 1042.3
150 MeV FFAG
- Measurements of magnetic field.
Measurements of magnetic field with hole probe.
Discrepancy (ΔB/B)
Magnetic Field (Bz)
20000
ΔB/B　(％)
15000
Bz (Gauss)
10000
5000
0
-5000
-10000
-15000
-120
-100
-80
-60
-40
-20
0
20
X (cm)
Y
Y=-35~+45cm 5cm step
X
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-120 -100 -80
-60 -40
X (cm)
-20
0
20
The discrepancy between any two magnets
is 0.3% at most. The alignment error of
hole probe explained that discrepancy.
DW
DX
82 cg
CD
91
88
ck
cd
bu
EQ
147
133
CM
144
145
EO
CK
CG CJ
EC
83 CJ
127
CE
EN
cm
EM
ce
89cm
CS
EY
cs
ea
155
EC
cj
81
88 CM
143
dx 133
ec
85
EG emeq
137
91 cr97
155
CR
89
gjEJ
EP
146
EY
88
el 148
EM
EE 141
ey
dv
84
135
cq
CQ
es ey
96
EK
143
150
CF ci
CJ
153
135
eu
CICK
EE ek ES
95
EUey
240
238
137
236
230
EW
232
234
81 cf 87
cp
228
co
en
er
226
ee ei eo
eq151
224
cj cl CP
222
ep
220
DV
149ew
218
94 98
EY
138
CO
216
FA
ew157
214
CT
BY
212
ER
et
EQ
cp
210
208
EA EI143 EW
206
CL 93
ck
CP
EG eo 155
204ej
202
ct
CJ
147153fa
200
95
cj 90 CQ
198
EM
92
FA
EO 157
fa
196152
cn cq
96
gl
157
139
94
FA
194
IF
fa
131
cq
90
ch
ID
CQ
126
192
IB
85
HZ
HX
145
CN
190
em
HV
eg em 155
188
EH
HTev ET
cf 88CL 95
186
HR
cb
CN
121
92
CH 91
EYFC
184
HP
85
CR
DQ
FF
159
HN
95
182
96
dp
dy
HL
94CR
dq
ey
97ct99
cl 92
cr
coCQ
180
96
93
141
CS
cs
HJ
cq
EM
86 CMCO
CU
CP96CT
98
178
fc
CT
cu
HH
CU
ct
CC CF
DP
cp
cs
99
CO 98
176
99
HF
fc
CN
159
FC
gnEV
93
CSCU
cu
93 cr
CG
100
cr97ctcu
cv
EK
CR
cm
HDex
ds
cmco CR
FC
174
CV
ds
FE
DS
cg
CV
161
99
HB
123
CG ck cncp CT
100
EK
120
CU
168
cv
136
fc
172
GZ
CM
CW
101
fe
162
fe
ek
141
166
98
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FE
ek
cucw
CB
154
160
GX
ez
CK
DY
170
101
161
fb
CP
164
GV
91CO
by
84
CW
eh
cw
100
158
fd
DS dx
cr
fg
FG
129
GT
163
89
CV
cs cv102
97
eg
124
94 CS
CX
ci
EX
156
GR
cx
cg
EG
141
CW
139
cw
ff
gp
ei
drDT
101
137
GP
co
139
EI
dt
EI
102
163
ei
122
123du ea 139
CX
EF
GN
165
102
du
CX
103
FI
CY
fi
FG
cxcy
DU
GL
DU
cxcz
DR
if
dvDX
CZ
DR125
CI
cc
id
ee
104
125
fh
ib
126
DV
cy
103
fg
GJ
CY
hz
fj
dr
hx
128
EZ
105
80
cl
dw EE
GH
hv
FB
DA
ht
cz
fcfe
fl
CZ
104
135
GF
103
FD
da
122
161167
hr
CL
DW
GD
FK
127
fk
FE
gr
ey
87
hp
143
fm
da
FM
cv CY105
FfoO
fe165
DA
169
171
CV
90
FF
GB
100
cu
hn
FK
167
FC FI
CU
fk
CW
107
101
cw
161fi
ec
fif169
hl
99
db
DC
k
dc
cxcy 106
DB
100
FZ
CX
165
FM
102
FI
fiFK
CY
cz
FG
dDB
fg
dl
CZ
ct 103
daDC
b108
157163
dk
DA
DL
hj
105
FX
dc
116
106
ddd
DK
ew
d110
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fdhdi
EYfa FI
CTCV 104
107
167
DD
DF
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dg
d115
DE
FK
108
109
fkfm173
db
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111
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DH
fn
167
112
113
hh
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DM
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169
171
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FS
fm
FO
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175
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dx
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159
169
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FO
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104
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167
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163
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105
175
FS
128
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109
FG
103
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177
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175
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173
179
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dc
fq
DC
DT dw EC
107
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DN
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118
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175
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FS
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102 106
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FW
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135
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FR
DG
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169
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DH
DJ
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GA
110
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DN
185
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183
114
GE
FG
177
FU
181
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gc
175
FA
GC
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egg
131
fy
dn
DW
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FU
ft
EA
ec
fe
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179
FW
189
119
DO
155
DCDE
DY
113
171
GG
DF
107
do121
ea
fu
104
dh
GE
de
129
191
DB
124
DH
GI
DQ
dy
gg
gi
D
FY
h
159
193
GK
d111
f112
179
hq
181
fy
GA
126
195
GM
GG
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gk
h
239
hb
183
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h
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GO
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199
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HU
201
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203
HS
DG
dq
hss231
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DP
gi
gk
225
HQ
118
DR
185
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H
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GW
223
HO
hq229
DD
117
gt
221
FC163
ga
GI
gm
229
110
fy
ho227
ic
ddc
DS
183
gs205
GY
177
HA
db
HM
dg 114
127 133
108
DM
191
hm
h225
227
107
gk
gu207
w
HC
233
119
HE
HK
IA
g209
hy211
HG
H
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dm
dp
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dv
dc109
d110
120
GE
231
IC
DE
EE
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hc215
DL
187
hk
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gh219
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109
DN
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hm
185
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237
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223
110
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124
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118
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117
DP
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115
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193
DG
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105
GM
191
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111
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187
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ge
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195
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221
di
193
hc
HW
H
Y
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233
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187
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GO
229
231
134
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he
235
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GM
127131
237
DJ
195
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227
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HS
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hk
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gg
da 108
114
GG
197
hm
225
239
191
HQ
GO
ho
hw
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hq
hu
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199
hs
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dt
DK
HO
dk
GQ
223
dg
DL
DR
cz
d
l
120
ds
183
dl
HK
125
dm
GS
203
119
201
221
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113
185
191
GI
gi
GU
114
d
DO
n
DP
GW
do
h
w
GY
219
gw
HU
231
112
dh
d
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HK
207
229
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HW
233
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217
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239
203
227
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DU 129 137
GW
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213
HC
225
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EG
116
193
GY
HQ
ha
117
DM
195
w
GM
gm
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h
118
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DN121
h
dq
dr
HA
HG
223
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DQ
ho
HO
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207
197
go
hc
H
IIHM
DR
GO
HI
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he217
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DT DW
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HK
HM
199
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HC
HO
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209
h
122
221
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201
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ggu
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205
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w
123
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205
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HC
H
213
207
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HG
he
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hc215
gv
211
ce
213
125
128
215
217
219
fz
DU
221
223
225
227
229
235
231
dy
237
du
233
239gt
dv 129
CH
DY
DVDX
gb
dx
gr
126
133
ck
gp
gd
eu
gf
gv
CK
gn
89
gl
153
gh
gj
“Simple” Comparison to TOSCA
(after current trimming)
dB/B
(measured-TOSCA)/TOSCA
1.00
0.75
dB/B (%)
0.50
0.25
Flat field of F
0.00
-0.25
Flat field of D
-0.50
-0.75
-1.00
EU
es
CE ch
ch
87
88
ca
83
74
82
ED
gx
EA
DY
CHCJ
CIcj
ES
151
gz
86ci
ek
149
-140 -120 -100 -80 -60 -40 -20
CA
dy eg
78 CD
BV
x (cm)
Radial end field
hb
ed
hd
eq
FJ
131
hf
hh
Deviation between Measurement and TOSCA
is within 0.3% in flat field area.
79
cd
cd
cg
hj
CG
EQ
hl
85
BZ
hn
hp
EG
CD
83
hr
ht
hv
hx
hz
id
if
ib
Discrepancy between any Magnets
1.00
0.75
0.50
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0.25
0.00
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43
3 45
cd
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ba
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ch
CH
54
AH
ah
bb
BB
55
85
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657
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cg
BC
bc
D
B
bd
E
35
8
5
F
B
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b
9
5
AI
84
bf
0
6
CF
16bBK
BG
gbH
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26bj B
h6BI
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5bn
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83
bm
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07bB
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2
2T
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8C
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bt B
8CC
B
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36
AJ
aj
37
AK
ak
AL
38
al
39
AM
am
40
AN
an
41
AO
ao
-0.50
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AP
-100
-80
-60
42
-40
x (cm)
-20
0
150MeV FFAG – Schedule
fiscal 2003
4
FFA G C om m issioning
入射コミッショニング
5
バンプ調整
R F システム、ビーム加速調整
6
7
inspection by the government
Starting Experim ent
取り出し調整