ffag 加速器ビーム増強 現状と今後の展開...2015/01/16 · rats 7 machine parameters...
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FFAG 加速器ビーム増強 現状と今後の展開
1
京大炉 石 禎浩2015.1.16
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目次
2
1. おさらい(施設・装置概要)
2. FFAGビーム利用
3. FFAGビーム増強の現状
4. 将来計画
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FFAG – KUCA ADS system schematic diagram ( original ) 2008 - 2010
Ion source
Injector (ion-beta)
Booster
Main ring
Critical Assembly (KUCA)
125 keV 1.5 MeV 11 MeV 100 MeV
TargetH+
3
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FFAG – KUCA ADS system schematic diagram ( upgraded ) from 2011
Ion source
Main ring
Critical Assembly (KUCA)
30 keV 11 MeV 100 MeV
TargetH-
LINACH-
H+charge
exchange
4
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FFAG – KUCA ADS system schematic diagram ( upgraded ) from 2012
Ion source
Main ring
Critical Assembly (KUCA)
30 keV 11 MeV150 MeV
TargetH-
LINACH-
H+charge
exchange 100 MeV
Irradiation chamber for material experiments
5
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FFAG – KUCA ADS system schematic diagram ( added medical port ) 2014
Ion source
Main ring
Critical Assembly (KUCA)
30 keV 11 MeV150 MeV
TargetH-
LINACH-
H+charge
exchange 100 MeV
Irradiation chamber for material experiments
6
150 MeV
Medical irradiation
Rats
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Machine Parameters
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Beam Line from Linac to MR
Q Magnet ×8*, B Magnet(30deg) × 2
linac
FFAG-ERIT ring
FFAG main ring
charge exchange foil
hori. steer vert. steer hori. or vert. steerH- ion source
* added one QM inMay 2011
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Layout of accelerator complex in the Innovation Research Lab.
accelerator roomirradiation hall
ERIT-FFAG
11MeV Linac
150MeV FFAG Complex
to KUCA
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-1
0
1
2
3
4
5
0 5 10 15 20 25 30
beta
, eta
( m
), B
_z (
T )
azimuthal ( deg )
beta_xbeta_yeta_x
B_z
Beta functions and B field in the main ring
FD D
1
1.1
1.2
1.3
1.4
1.5
3.5 3.6 3.7 3.8 3.9 4
tune variation
Einj 11MeVEext 100/150MeVfrf 1.6 - 5.2MHz
<R> 4.57 - 5.4mBmax 1.6T -6
-4
-2
0
2
4
6
-6-4-2 0 2 4 6
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Beam injection to the main ring
0
1
2
3
4
5
6
0 1 2 3 4 5 6
87mm
0.5°
H-
H+
main magnet
F-mag D-magD-mag
charge stripping foil
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-1
0
1
2
3
4
5
6
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
"fort.52" using ($1/1000):3"fort.52" using ($1/1000):5
"fort.53" using ($1/1000):(-$7)
foil
βx
path length ( m )
βy
Bzβx (
m ),
βy
( m ),
Bz (
T )
injection point
matching point
Beta functions calculated from backward tracking in the main ring
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H- beam line beta functions calculated using SAD
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FFAGを用いたユーザー実験
14
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施設の利用現状と計画
15
1. ADSの基礎研究
2. 材料照射・空気放射化3. 医学利用
• BNCT基礎研究 ( ラットへの照射)
• BNCTに対する相補的な治療照射
4. パルス中性子源
• TOF 実験
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BNCT基礎研究ラットへの照射
to KUCA
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材料照射用チェンバー
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KUCAにおけるADSのための基礎実験
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ADS 実験装置
ターゲット
未臨界燃料体系ビーム輸送系
炉心
- FFAG Accelerator : 100 MeV Protons 20 Hz repetition rate 1nA intensity W and Pb-Bi target
- KUCA A-Core :W / Pb-Biターゲット(電流読出可能)
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20
Fig. Core configuration of 235U-Poly. Cores (100 MeV protons)
Fig. Neutron spectra (W vs. W+Be)
Fig. In reaction rates (W vs. W+Be)
Y. Takahashi et al., Ann. Nucl. Energy, 54, 162 (2013). T. Yagi et al., Appl. Radiat. Isot., 72, 11 (2013). C. H. Pyeon et al., PHYSOR2014, (2014).
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Fig. Core configuration of 232Th-Poly. Cores (100 MeV protons)
Fig. Results in Th-HEU-PE with 100 MeV protons
Fig. Results in Th-HEU-PE with 14 MeV neutrons
Cal. Exp.
Core MCNPX 100 MeV Protons
14 MeV Neutrons
Th-HEU-PE 0.5876 0.7346 0.6577
Table Results in keff (3He #3; Area ratio method)
βeff = 8.491E-03; SRAC-CITATION 107-G, 3-D
α = 5065 ± 28 (100 MeV Protons) 5288 ± 13 (14 MeV Neutrons)
C. H. Pyeon et al., Nucl. Sci. Eng., 177, 156 (2014).
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KUCAでのADS実験では現状を超えるビーム強度は不要
放射線遮蔽が限界
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23
照射実験
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150 MeV陽子ビームラインに設置された照射チェンバー。冷凍機と引っぱり試験機が装備され陽子ビーム照射中での測定が可能。
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陽電子寿命測定、電気抵抗測定において格子欠陥の生成分布に計算との違いがみられた。電気抵抗測定の追実験により確認を継続中。
100 MeV陽子ビームの照射(240nA-h)により表面ぬれ性の改善 がみられた.
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26
照射実験ではビーム強度は強いほど良い安定性は現状の性能でOK
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27
生物実験
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28
Pre-run for Rat Experiments
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Bragg Peak Measurement
Beam energy and intensity are sufficient for rat experiments
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30
生物実験ではラットの照射野が小さいためビーム強度は十分である安定性も問題なし
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31
ビームスタディー106 時間照射実験
171 時間
ADS. 実験.
77 時間合計354 時間
ビームスタディー109 hr
照射実験288 時間
ADS. 実験 70 時間合計
468 時間
マシンタイムまとめ2013年度 2012年度
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ADS実験中のマシントラブルによるビームトリップ
32
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
12/15/12 12/29/12 01/12/13 01/26/13 02/09/13 02/23/13
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
01/25 02/01 02/08 02/15 02/22 03/01
main rf
LINAC
main rf
LINAC
10 trips / 77h
0 trips / 77h
3 trips / 70h
7trips / 70h
2012
2013
アンプ冷却水流量低下
配管増設
ケーブルノイズ配線補修
真空管トラブル 真空管交換
1分以内の早い
復帰
が要求されて
いる
遅い復帰(10-20分)
早い復帰
遅い復帰(20分)
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ビーム安定性(1ランあたり)
33
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ビーム安定性(1日あたり)
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History of beam intensity and energy upgrade in recent years
year Energy (MeV)
intensity rep.rate ( Hz ) injector notes
extraction @CA target
March 2009 100 50pA ~3 pA 30 ion beta
booster -
March 2010 100 100pA 30pA 30 ion beta
boostertransport efficiency upcavity voltage 2.5 ->4kV
March 2011 100 1nA 100pA 20 H- H- injection
kicker system upgrade
March 2012 100 10nA 100pA 20 H- bad focusing on CA target
March 2013 150 10 nA 1nA 20 H-
energy up (150 MeV for irr. exp.) still 100 MeV for ADS exp.
beam tripped often due to rf trouble ( in both linac and main
ring )
March 2014 150 10 nA 1 nA 20 H- reliable supply based on stable
rf
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ここまでのまとめ
36
1. KURRI FFAGは150 MeV / 10 nAのビーム増強に成功。
2. 放射線規制上、下記のビームをユーザに供給している。 ADS実験:100 MeV / 1nA 照射実験および生物実験:150 MeV / 1nA 3. KUCAでのADS実験について、放射線遮蔽上ビームパワーは 上限に到達した。
4. 材料照射実験では、成果が出ているが、ビーム強度はあれば あるだけよい。
5. 生物実験では、ラットへの照射に関しては、エネルギー、ビーム 強度、安定度、ビームスポットについて要求を満足している。
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空間電荷効果によるチューンシフト
37
Rep. rate:100 ~ 200 HzAverage current:5uA
N 3.12� 1011
r0 1.53� 10�18 protonR0 4.54 m average radius of injection orbit�, � 0.147, 1.011 11 MeV�x, �y (3.7, 1.4)(a, b) ( 20, 15 ) mmBf 1/5F 1.5h 32.5 mm half gap of the vacuum chamberg 37.9 mm half gap of the magnet
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増強計画•下記の要因によるビームロスの低減
•フォイルでの多重散乱(速い加速)• RF捕獲からのこぼれ落ち(RFパターン最適化)•ベータトロン共鳴( COD補正、補正磁極、速い加速 )
→ X 10 •繰り返しをあげる20 Hz → 100 Hz
• 2台目の空洞の組込み(2015年)→ X 5
•イオン源増強→ X 2
2015年度終わりまでに1uAのめどをたてる
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パルス中性子源に向けた取り出しエネルギーでのRF Stacking
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大強度ビーム
ピーク電流アップ
高繰り返し
空間電荷効果大
ビームロス
頻度が高すぎて使えない
e.g. TOF困難
RFスタッキングによりパルス毎のビーム強度を上げると同時に頻度を落とす
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加速
入射
加速したビームを 外周軌道に積み上げる
取出し
固定磁場なので加速とともに軌道が外に移動
まばらだが一つ一つが大強度のパルス構造を持つビームが取出される
繰り返し頻度の高いパスルビームを入射
時間
ビーム強度
時間
ビーム強度
小 大空間電荷効果 {
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flat top
RF stackingの可能性
previous batch
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これからのこと•近い将来 ビーム強度増強 1 - ( 5 )uA
• 2台目の空洞インストール (2015)•中期計画
•ビーム強度増強 5 - 10 uA• LINACエネルギー増強 11MeV → 20 ( 30 )MeV• 30 MeV サイクロトロン(BNCT機相当)入射器の可能性検討
•エネルギー増強150 MeV → 700 MeV•中性子発生量激増•リング新設
https://indico.bnl.gov/getFile.py/access?contribId=26&sessionId=4&resId=0&materialId=slides&confId=686
H.Okita FFAG14 BNL NY sep 21 2014
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700MeV FFAG
Wednesday, November 19, 14
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これからのこと•近い将来 ビーム強度増強 1 - ( 5 )uA
• 2台目の空洞インストール (2015)•中期計画
•ビーム強度増強 5 - 10 uA• LINACエネルギー増強 11MeV → 20 ( 30 )MeV
•エネルギー増強150 MeV → 300 MeV•電磁石の改造 → 電源、冷却水はそのまま使える• 30 MeV サイクロトロン(BNCT機相当)入射器の可能性検討• pion生成/muon生成 → 核変換• ADS の新展開( JAEA 400 MeV )•陽子線がん治療(BNCTでは届かない患部への照射)
https://indico.bnl.gov/getFile.py/access?contribId=26&sessionId=4&resId=0&materialId=slides&confId=686H.Okita FFAG14 BNL NY sep 21 2014
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back up
47
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Background
3
150 MeV FFAG
・Beam commissioning・Development of components
・Proton beam12 MeV ⇒ 150 MeV
・Prototype of proton FFAG for various applications
at Kyushu University
150 MeV FFAG
Hidefumi Okita
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Motivation
Compact Accelerator Spiral FFAG
・Particle physics ・Medical (BNCT)・Material science 300 MeV
4
A 300 MeV or more over proton beam
※1
※1 : N. J. DiGiacomo, et ai., Phy. Rev. C 33 988 (1986)
150 MeV FFAG ⇒ 300 MeV FFAG
Hidefumi Okita
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Requirements for the accelerator
・Magnetic field : B < 1.6 [T]
・Injection momentum:151 [MeV/c] (proton 12 MeV)
・Size of accelerator Maximum beam radius = 5.30 [m]
・Excursion < 1.40 [m]
・Extraction momentum:808 [MeV/c] (proton 300 MeV)
・Cell Number : 12 (the same number as 150 MeV FFAG)
150 MeV FFAG
6.4 [m]
5.3 [m]
Hidefumi Okita
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Requirements for the accelerator
Center of Accelerator
・Magnetic field : B < 1.6 [T]
・Injection momentum :151 [MeV/c] (proton 12 MeV)
・Size of accelerator Maximum beam radius = 5.30 [m]
・Excursion < 1.40 [m]
・Extraction momentum :808 [MeV/c] (proton 300 MeV)
・Cell Number : 12 (the same number as 150 MeV FFAG)
Hidefumi Okita
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Field clamp
Geometry of spiral magnet with field clamp
24
yoke
Pole
Coil
The figure in the lower half of magnetic
Hidefumi Okita
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まとめ• FFAG現状
•ビーム仕様 150 MeV / 1 nA ( 10 nA ) 20Hz• KUCAでのADS実験、材料(飼料)照射、BNCT基礎研究• 2013年度以降マシン側の事情で実験キャンセルは無し•ビーム強度安定性が向上•ビームトリップ回数減少、回復時間短縮
•今後• 150 MeV 1 - 5uAを目指す• 300 MeV増強も視野に入れる
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ビームスタディー
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F1 radial probe
S2 radial probe / hor. rf shaker / profile monitor
S3 vert. perturbator
S5 movable triangle bunch monitor
F5 radial probe
S6 radial probe
(F6) Faraday cup / screen monitor
S7 bunch monitor
F7 radial probe
S9 radial probe
S11 bunch mon.( array of triangle plates)
S12 bunch monitor
List of monitors
7 ports for radial probes ( blue arrow, ICF70 )4 portable radial probes remote cntrl’d 2 portable radial probes manual cntrl’d 1 unportable radial probe ( green arrow )3 bunch monitors1 faraday cup / 1 screen monitor1 perturbator
-6
-4
-2
0
2
4
6
-6-4-2 0 2 4 6
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10S11
S12
foil
cavity
ext. kicker2
ext. kicker1
F1
F2
F3
F4F5
F6
F7
F8
F9
F10 F11
F12ext. septum
H- Beam
Available Monitors in ADSR-FFAG Ring
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beam profile on the fluorescent screen
pedestalraw data
after pedestal subtraction
vertical profile
horizontal profile
Beam Profile Measurement
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beam position monitor for tune measurement
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Horizontal RF shaker
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Real time spectrum analyser
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1.1ms
2.7ms4.3ms
20.1ms
short bunch study
acceleration time ( ms )
char
ge /
bunc
h( a
rb. u
nit)
2014.02.27
1e-09
1e-08
1e-07
1e-06
0 5 10 15 20 25
'tom.xy' u ($3+2.2911799900000002E-002)*1000:5
660 ns : 2 turn equivalent bunch length
fast losses : betatron resonances → precise measurement of the tune
slow loss : transverse emittance blow up due to the foil→ emittance growth measurement
longitudinal spill out from the bucket→ test rf pattern considering real k variation
energy struggling
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fast loss : 1. betatron resonances → precise measurement of the tune
slow loss : 1. transverse emittance blow up due to the foil → emittance growth measurement
2. longitudinal spill out from the bucket → test rf pattern considering real k variation
3. energy struggling
4. matter of bunch monitor signal as a function of frequency → precise intensity measurement during acceleration
investigation to determine the cause of beam losses
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1
1.1
1.2
1.3
1.4
1.5
3.5 3.6 3.7 3.8 3.9 4
tune measurement 2014.06.27 - 07.01
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1
1.1
1.2
1.3
1.4
1.5
3.5 3.6 3.7 3.8 3.9 4
0.10.2
0.4
0.80.6
1.0 1.32.0
2.52.93.0
4.0
5.0
6.0
7.08.0
9.010.0
13.016.0
19.0
22.023.0
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もう使っていない
古い機器を取り払う
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4600
4800
5000
5200
5400
0 10 20 30Loss time (ms)
Prob
e ra
dius
(mm
)
COR=750A
INU
NEZTAZ
4600
4800
5000
5200
5400
0 10 20 30Loss time (ms)
Prob
e ra
dius
(mm
)
COR=900A
INU
NEZTAZ
COD after removal of unused magnets
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1
1.1
1.2
1.3
1.4
1.5
3.5 3.6 3.7 3.8 3.9 4
Before removal of mags and probecorrector:450AD:1014A
After removal of mags and probecorrector:750AD:980A
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案 方式 エネルギー(MeV)
平均電流(mA)
ピーク電流(mA)
時間構造ビームパワー(kW)
熱中性子数(n/cm2/s)
装置価格(億円)
1
2
2’
3
4
5
6
LINAC 11 5 50 パルス(10%) 55 1.0E+11 3
LINAC 20 5 50 パルス(10%) 100 4.0E+11 6
LINAC 30 5 50 パルス(10%) 150 7.5E+11 <10
Cyclotron 30 2 -DC
(パルス化も検討中) 60 3.0E+11 5
Cyclotron 100 0.05 -DC
(パルス化も検討中) 5 1.0E+11 35
FFAG 150 0.005 5000パルス
(数100ns, 10 - 100Hz)0.75 2.5E+10 1
FFAG 700 0.005 5000パルス
(数100ns, 10 - 100Hz)3.5 4.8E+11 30