Transcript 150 MeV FFAG

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 May 16, 2003
Nufact-j@東京都立大
Contents
150MeV FFAG Accelerator
–
–
–
–
–
Introduction
Schematic drawing
Parameter
Injection and Extruction
Schedule
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 manipulator of secondary
beam; PRISM, Muon Accelerator.
The design of Nutrino factory, Japanese group proposes, based on scaling FFAG ring.
Introduction – 150MeV
•
FFAG Synchrotron
FFAG was proposed by Ohkawa, Symon and Kolomensky. (~50’s)
•
An electron FFAG at MURA project.
PoP FFAG
We have no proton FFAG before the PoP (proof of principle) FFAG.
In June 2000, Our PoP FFAG accelerated the proton beam successfully.
… confirming the acceleration can be done in 1msec.
150 MeV FFAG project
The project to construct a practical machine was started.
…establishing the beam extraction in high reputation rate
The main issues in a five-year plan …
1. Extraction of the beam high repetition rate in 250Hz
2. Development of the 3dimmensional spot scanning
Feasibility Study for scaled-up FFAG Accelerator,
ex.) Construction of large FFAG ring, Fabrication of Yoke-Free Magnet and large aperture RF
system, Establishment of injection and (FAST) extraction scheme …
150MeV FFAG
– Overview
KEK-PS East Counter Hall
FFAG実験室概要図
150MeV FFAG 実験室概要図
12MeV Proton
150MeV Proton
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
Revolution Freq. : 1.7Mhz-4.6Mhz
Bump Decay time: 6.6μsec
Current
: 40 nA
(limited by shield thickness)
RF peak voltage: 19kV
150 MeV FFAG
– Beam simulation
• A beam simulation with final design of the magnet.
Tune vs. mean radius
Tune diagram
150 MeV FFAG
- Return Yoke Free Magnet
• “Return Yoke Free Magnet ”
The return yoke of Focusing
sector is removed.
D coil
F coil
F Sector
Shunt
D Sector
ΦF: B in F Sector
ΦD: B in D Sector
ΦS: B in Shunt
150 MeV FFAG
– The design of
• The design of the edge of
the F-sector pole
the magnet pole
• The final design of the poles
Focusing sector
halfgap
 5400
 21 
r




7 . 75
Defocusing sector
w/o patch
halfgap
 5400
 20 
r




halfgap
 4900
 39 . 9 
r

9 . 32
( r  4500 ～ 4900 )



11 . 555
 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
Measurement of Magnetic field
7000
h alf cell
Alignment error ~0.2mm
y (m m )
6000
5000
extraction en ergy
in jection en ergy
4000
3000
-2000
-1000
0
1000
2000
x (m m )
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 8 8 3 .7 A
4300
D 1300 A
D 1080 A
m e a su re
@ D e fo cu s (G a u ss)
M e a su re d B z
d e sig n
D 880 A
4200
D 780A
d e v ia tio n !
4100
D 680 A
4 0 0 0 D 1 0 4 2 .3 A
Design (125MeV mode)
F: 910A / D: 780A
F 910A
3900
F 885 A
F 860 A
3800
6600
6700
6800
6900
7000
Coil
F: 50 turn
D: 5 turn
7100
M e a su re d B z
@ F o cu s (G a u ss)
Measured field magnitude (not shape) deviates
a little from design value.
Trimmed
F: 883.7A / D: 1042.3
DW
DX
C8 2D c g
8 c8 k 9 1
cd
bu
C G CCJK
83
CJ
CE
cm
ce
8 9c m
cj
81
88 C M
85
91
89
88
EQ
147
133
CM
144
1E4O5
EC
127
“Simple” Comparison to TOSCA
(after current trimming)
84
dB/B
97
cr
CR
q6
Cc 9Q
EJ
gj
el
1 4 81E4P6
150
C F cCi J
C IC K
95
22 43 08
22 33 6420
81 cf 87
228
c co p
eern
22 22 46
cj cl C P
ep
2 2 02
122311868
C 9O4 9 8
214
CT
BY
212
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cp
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204
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gb
gr
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ck
gp
gd
eu
gf
gv
CK
gn
89
gl
153
gh
gj
(measured-TOSCA)/TOSCA
1 .0 0
0 .7 5
0 .5 0
d B /B (% )
EN
EM
eEaC
1E5Y5
143
d x 1e3c3
eq
1E3G7 e m
155
EY
E E 1 4E1M
ey
dv
135
es ey
E1K4 3
135
e1u5 3
E E e k EESUe y
137
EW
e e e i e eo q1 5 1
DV
1 4 9e w
EY
e w1F5A7
EQ
E A E I1 4 3 E W
EG eo 155
Cc sS
0 .2 5
F la t field of F
0 .0 0
-0 .2 5
F la t field of D
EU
es
C E ch
ch
-0 .5 0
87
ED
gx
EA
88
-0 .7 5
ca
83
74
82
-1 .0 0
DY
C HC J
CcI j
E1S5 1
gz
8 6c i
R a d ia l en d field
ek
149
-1 4 0 -1 2 0 -1 0 0 -8 0
CA
-6 0
dy
-4 0
ed
eq
x (cm )
BV
hb
hd
eg
78 C D
-2 0
FJ
131
hf
hh
Deviation between Measurement and TOSCA
is within 0.3% in flat field area.
79
cg
cd
hj
CG
cd
EQ
hl
85
BZ
hn
hp
EG
hr
CD
83
ht
hv
hx
hz
id
if
ib
Discrepancy between any Magnets
1 .0 0
0 .7 5
0 .5 0
d B /B (% )
0 .2 5
3 d4 5
c
1a CD
A
E
e
b2
B
0 .0 0
-0 .2 5
43
aq
6
F
f
AQ
7
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gH
8
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r
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c
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Q
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aw
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W
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o
c
n
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C
3c
9C
1c
M
9l m
c0L
72aA
2N
9C
ax
V
74av
93a A
2ac
A
y52zaa
9kKcC
8cC
A
C
C
A
1E
3ae
auU
b8B
2F
3af
d0D
6T
4A
5az2Z
A
S
AA
3
3agG
A
78ic
8C
I 8Jj
cC
A
3A
arasat
4
a5
B5bB
6H
8h
Cc
4
A3ahH
bB
bB
5
5g
C8c G
6
C
cb B
b5B
D
7
5
d
E
5
3A
8
5
F
B
e
b
9gb6 H
8c4F
bB5fbB
0
f
16iIbB
G
2J
h6B
aiI
3K
6bj B
bB
5b6B
6l m
k6bB
6
7
8
M
3E
8C
O
b4L
N
B
9
nb B
e
c
Q
0r7bB
ob6B
R
1S
pP
q7bB
b6B
2
2T
3
57bB
6X
dD
cC
18
8C
U
7yY
9aA
7cC
W
s7bB
t7
8zZ
u7bB
bB
8C
B
v7w
b4V
c
c
x7b B
bC
b0B
c
3 6J
A
aj
A3ak7K
A
3al8L
9
3M
A
am
0
A4anN
1
A4 O
ao
-0 .5 0
-0 .7 5
AP
-1 .0 0
-1 0 0
-8 0
-6 0
42
-4 0
x (cm )
-2 0
0
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.
FFAG Magnet 設置
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。
サイクロトロン&トランスポート
サイクロトロン
•250Hzパルス運転の成功
•最大取り出し電流0.5μA
•（サイクロ内部1.5μA）
トランスポート
（ステアリング+トリプレット四十極電磁
石）*2 のシステム
ビームトランスポートの調整中
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
~25nA
60nA
30nA
~25nA
With Magnetic and Electric
Septum
Momentum ~137MeV/c particle
25th April 2003
First circular beam was measured
in 150MeV-FFAG Synchrotron Accelerator.
150MeV FFAG
fiscal 2003
4
– Schedule
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
Summary
• We finish the construction of 150 MeV FFAG
Accelerator, and starting the beam study.
• We observed the circulating beam of one turn with
Faraday Cup with Magnetic and Electric Septum.
For 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.