AccLab BmSci ICRKyotoUniversity
Permanent Magnets
Y. Iwashita Kyoto University
AccLab BmSci ICRKyotoUniversity
PMQ with saturated iron pole
0.0
0.5
1.0
1.5
2.0
2.5
0 0.2 0.4 0.6 0.8 1
By (iPMQ1 w/Permendur)By (iPMQ w/Fe) [T]By (PMQ16) [T]
X
PM only2.2 [T/cm]
with Permendur2.5 [T/cm]
with Fe 2.4 [T/cm]
iPMQ1616segID=6OD=24 CYCLE=7
F e
1 0 1 2 00
I D : ø 2 0
O D : ø 2 4 0
B=2Br (1-r1/r2) cos2(π/M) sin(2π/M) /(2π/M)
AccLab BmSci ICRKyotoUniversity
First prototype (fixed field)
Prototype PMQ Measurement at SLAC
AccLab BmSci ICRKyotoUniversity
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Double Ring Structure
The double ring structure
PMQ is split into inner ring and outer ring. Only the outer ring isrotated 90° .around the beam axis to vary the focal strength
ON
Permanentmagnet
Pole material QuickTime˛ Ç∆ ÉOÉâÉtÉBÉbÉNÉX êLí£ÉvÉçÉOÉâÉÄ
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.First Quadrant shows the flux plot
AccLab BmSci ICRKyotoUniversity
Adjustable Permanent Magnet Quadrupole
s
ss ttt rrr ooo nnn ggg p pp ooo sss iii ttt iii ooo nnn w
ww eee aaa kkk p pp ooo sss iii ttt i ii ooo nnn
r
rr ooo ttt aaa ttt iii ooo nnn p
pp e ee rrr m mm a aa n nn e ee n nn t tt m mm aaa g gg n nn eee t tt p pp o oo l ll e ee m mm a aa t tt e ee r rr i ii a aa l ll
M
MM S SS - -- 1 11 e ee n nn ddd p pp l ll aaa t tt e ee s ss 1
11 c cc m mm p pp i ii eee c cc e ee s ss o oo f ff M MM SSS - -- 1 11
outer ring
inner ring
Permanent Magnet (NEOMAX38AH)
The PMQ is composed of an inner ring andfour outer rings (Double Ring Structure).Only the outer rings are rotated in order tochange the integrated gradient. The fixedinner ring suppresses any errors caused byrotation of outer rings.
AccLab BmSci ICRKyotoUniversity
Drawing210
200
80 2010 40
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(KANDON)
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260
REMARKS
NO.REQUIRED MASS (kg)
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APPROV.CHECK.DESIG.DRAWNDESCRIPTIONDATENO.
TOTALPER ONETOTALSPAREWORKING
MARK PARTICULARS MATERIAL
3RD ANGLE
PROJECTION
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PROJECTION
1ST ANGLE
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DRAWING
NO.
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NO.
SCALE
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AccLab BmSci ICRKyotoUniversity
Prototype Magnet
1.4TInt. gradient step size3.47TIntegrated gradient (weakest)
24.2TIntegrated gradient(strongest)NEOMAX44HMagnet material (outer ring)NEOMAX38AHMagnet material (inner ring)PermendurPole material23cmPhysical length1cm, 2cm, 4cm, 8cmOuter ring section lengthIn 3.3cm out 5cmOuter ring radiiIn 1cm out 3cmInner ring radii1cmBore radius
Making of the PMQ
AccLab BmSci ICRKyotoUniversity
Photos
AccLab BmSci ICRKyotoUniversity
Magnetic Center Movement
Magnetic Center moves by tens of micron when the strength was changed.
40.0
50.0
60.0
70.0
80.0
90.0
100.0
40 45 50 55 60 65 70
Y [µm]
-X [µm]
4cm
2cm
15cm1cm
11cm
8cm
0cm
Reproducibility better than 3 µm!
Only 2 sets, but reproducibility ~ 0.1 µm!
The movements are to be adjusted.
AccLab BmSci ICRKyotoUniversity
Configurations for Various Crossing Angles
0 mrad.(Head-On)
2 mrad.L*=3.5m
20 mrad.L*=3.5m Outgoing Beam
Incoming Beam Table II PMQ parameters for various crossing angles.
2 mrad.L*=5m
C r o ss in g a n g l e [ m r a d ] 0 2 2 0
O u te r D ia m . [m m ] 1 8 0 1 8 0 1 0 0
M a x . G r a d i e n t [ T /m ] 1 8 0 1 3 0 1 2 0
M in . G r a d i e n t [ T /m ] - 2 0 - 6 0 8
AccLab BmSci ICRKyotoUniversity
Demagnetization by Radiation
300.3%32EH
210.7%39SH
161.8%44H
10.2%47H
iHc
[Oe]
Demag. ratio
[/1x1013n/cm2]
Magnet
very preliminary results by T.Abe (university ofTokyo), in private communication1mW
1mW1mW0.3mW0.3mW0.3mW0.4mW0.4mW0.4mWSF1SF1SF115mW15mW15mW18mW18mW18mW16mW16mW16mWQF1QF1QF111mW11mW11mW11mW11mW11mW11mW11mW11mWSD0SD0SD010
101055
[n/ cm[n/cm22s]s]147mW147mW97mW97mW97mW94mW94mW94mWQD0QD029mW
29mW29mW13mW13mW13mW17mW17mW17mWBeamCALBeamCALBeamCAL neutron
neutronneutronSiDSiDSiD(by(byTakashi)
Takashi)Takashi)SiDSiDSiDGLDGLDGLD
Energy deposit Demagnetization by 14MeV neutron
T. Kawakubo, et al., The 14th Symposium on AcceleratorScience and Technology, Tsukuba, Japan, November 2003,pp. 208-210, in Japanese,http:// conference.kek.jp/ sast03it/ WebPDF/ 1P027.pdf
Continuous 1 mo. operation may cause about 0.01[%] of (reversible?) demagnetization on NEOMAX 32EH.
AccLab BmSci ICRKyotoUniversity
Effect of Solenoidsolenoid coil
back coilmagnetic shield
16
18
20
22
24
26
0.0 0.5 1.0 1.5 2.0 2.5 3.0
External axial field [T]
Integrated strength is reduced by Solenoid field because PMQ has pole (vanadium permendur). Back coil and/or some shield is needed.
AccLab BmSci ICRKyotoUniversity
Recent ModificationDemonstrate a higher field gradient by reducing the bore size from ø20mm down to ø15mm.
Permendur Pole
1mm MS-1
1.6mm MS-1
Temperature compensation of the inner ring; 1 mm (left) and 1.6 mm (right) MS-1 trapezoidal plates are seen in a 2cm space between magnets.
AccLab BmSci ICRKyotoUniversity
Longitudinal Distribution
0
50
100
150
50 100 150 200 250 300 350
4cm
dBy/dx(T/m)
z(mm)
0
50
100
150
200
50 100 150 200 250 300 350
8cm
dBy/dx(T/m)
z(mm)
0
5
10
15
20
25
30
50 100 150 200 250 300 350
0cm
dBy/dx(T/m)
z(mm)
0
50
100
150
200
50 100 150 200 250 300 350
12cm
dBy/dx(T/m)
z(mm)
0
50
100
150
200
50 100 150 200 250 300 350
15cm
dBy/dx(T/m)
z(mm)
with IDø15
AccLab BmSci ICRKyotoUniversity
Rotating Coil Stand
AC servo-motor with encoder (up to 600 RPM)
AccLab BmSci ICRKyotoUniversity
What’s next?
•Finish magnetic field measurement system
•Fabricate third model
•Sextupole?
•Octpole?
•more?
AccLab BmSci ICRKyotoUniversity
Rotating PMSx for cold neutrons
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64 64 64 64 64
94
94 94 94 94 9944 94 ,104
,104
,104 ,104 ,104 ,,110044 ,104
,107
,107 ,107 ,107 ,107
80
80
80 80 80 8800 80 ,100
,100
,100 ,100 ,100 ,,110000 ,100 ,115
,115
,115 ,115 ,115 ,,111155 ,115 35
35
35 35 35 3355 35
22
22 22 22 22 2222 22
SS2-75 (150-154)SS2-25 (50-54) ø14
73
,154
,154
,154 ,154 ,154 ,,115544 ,154
6818 (90-115)
6000 (10-26)6001 (12-37)
ø14 Cold neutron beam can be focused by strong
sextupole.25Hz for ToF.
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