ILC Final Doublet –
PM version
1
AccLab BmSci ICR
KyotoUniversity
Permanent Magnet Study Short
History
2002~2005 First R&D program for
FFQ
Permanent Magnet Quadrupole for Final Focus
Lens in a Linear Collider
2002 Fixed strength PMQ
2003 Adjustable PMQ (double ring)
2004 Measurement and fine tuning
2005 Higher gradient at small bore
2006~2009 Second R&D program
Development and Application of PMQ for Linear
Collider and Neutron optics
2006 Half scale Model of Rapid Cycling
Sextupole
2007~Adjustable PMQ(2nd model)
2008 ...
AccLab BmSci ICR
KyotoUniversity
First prototype (fixed field)
Prototype PMQ
Measurement at SLAC
Bore: ø14, OD ø130, L100, GL=28.5T
(290T/m)
3
AccLab BmSci ICR
KyotoUniversity
The 20mr Variable FFQ Magnet
1cm
Inner ring radii
In 1cm out 3cm
Outer ring radii
In 3.3cm out 5cm
Outer ring section length
Physical length
1cm, 2cm, 4cm, 8cm
23cm
Pole material
Permendur
Magnet material (inner ring)
NEOMAX38AH
Magnet material (outer ring)
NEOMAX44H
Integrated gradient (strongest)
24.2T
Integrated gradient (weakest)
3.47T
Int. gradient step size
1.4T
Extra beam hole
Overview
Inner Ring
Bore radius
Outer Ring
Base plate
Before assembly
4
AccLab BmSci ICR
KyotoUniversity
Magnetic Center Movement
100.0
4cm
90.0
Reproducibility
better than 3 µm!
80.0
15cm
1cm
Y [µm] 70.0
2cm
0cm
60.0
11cm
Only 2 sets, but
reproducibility ~ 0.1 µm!
50.0
8cm
The movements are to be adjusted.
40.0
40
45
50
55
60
-X [µm]
65
70
The cm values show the Switched-On-Length
The center moves several µm for 20% strength change.
See http://accelconf.web.cern.ch/AccelConf/l04/PAPERS/TUP81.PDF (LINAC’04)
5
AccLab BmSci ICR
KyotoUniversity
14mr option needs
smaller OD
Eff.L [m] R [cm]
kG
kG/m
GL [kG]
QF1
2.0
1
8
803
1605
QD0
2.2
1
-14.2
-1416
-3116
QEX1
1.1
1.5
-15.0
-1000
-1060
[email protected]
extraction [email protected]
= 3.5 x 14m rad.
AccLab BmSci ICR
KyotoUniversity
Gluckstern’s skewless variable PMQ
d
d
d
d
M = R • M2 • R-2 • M1 • R2 • M0 • R-2 • M1 • R2 • M2 • R-1
Mxx O 5 
 when d=0.
4x4 matrix: M=  5
Myy
 O
R.L. Gluckstern and R.F. Holsinger: Adjustable Strength REC
Quadrupoles, IEEE Trans. Nucl. Sci., Vol. NS-30, NO. 4, August 1983,
http://epaper.kek.jp/p83/PDF/PAC1983_3326.PDF

AccLab BmSci ICR
KyotoUniversity
Large Bore ATF2 design:
Two Five-Ring-Singlets
Preview
Preliminary Draft
AccLab BmSci ICR
KyotoUniversity
Single Ring Train Configuration
Eff.L [m]
R [cm]
kG
kG/m
GL [kG]
QF1
2.0
1
8
803
1605
QD0
2.2
1
-14.2
-1416
-3116
QEX1
1.1
1.5
-15.0
-1000
-1060
AccLab BmSci ICR
KyotoUniversity
A Possible Configuration with Simple PMQ
The bore should expand 50%?
Use simple PMQ’s (single ring).
20% strength will be achieved by flipping 40% PMQ’s.
The step size can be reduced by subdividing the PMQ’s.
Fine adjustment by electromagnet.
The center shift should be investigated for this config.
ø20mm bore enough all along the 2.2m QD0?
10
AccLab BmSci ICR
KyotoUniversity
Summary of BG
There is no vibration source in PMQ.
1st variable PMQ was based on double-ring
structure (for 20mr) and evaluated.
2nd one (for 14mr) will have 5-ring-singlet
structure whose skew effect can be canceled with
appropriate ratios in lengths.
The strength can be changed continuously.
A prototype will be fabricated in JFY2007.
It will be measured in 2008~2009.
The current project ends JPY2009.
AccLab BmSci ICR
KyotoUniversity
目的:PM0-QD0において可変時の磁場中心の変動幅のビ
ーム実験による計測
必要な施設:ATF2
人員:4人(岩下 + 学生 + KEKstaff + PD1人)
年次計画案:
2007年:ATF2用ボアø50で製作 (ILC用ø20)
2008年:磁場測定 PD¥4M
2009~2012年:EM-QD0と置換してビーム実験 ?
FFTB Mover使用
2012〜2015年?:ビーム実験
AccLab BmSci ICR
KyotoUniversity
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