Permanent Magnets Y. Iwashita Kyoto University. PMQ with saturated iron pole B=2Br (1-r 1 /r 2 ) cos...

AccLab BmSci ICRKyotoUniversity

Permanent Magnets

Y. Iwashita Kyoto University


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)


First prototype (fixed field)

Prototype PMQ Measurement at SLAC


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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


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.


Drawing210

200

80 2010 40

ÇQèdQ-Magnetà íuåàÇflëïíu

ãûìsëÂäwâªäwå§ãÜèäìaå¸

1:2

2003/

12/08

70

ÉEÉHÅ[ÉÄÉMÉAå∏ë¨ã@ïtÇcÇbÉÇÅ[É^Å[

äÓèÄñ

í¥îñå^É{Å[ÉãÉxÉAÉäÉìÉO

(KANDON)

2

1

G03

MK03D

Mechatron

Hisano

ÉZÉâÉ~ÉbÉNÉ{Å[Éã

260

REMARKS

NO.REQUIRED MASS (kg)

å¥éqóÕéñã∆ïî

APPROV.CHECK.DESIG.DRAWNDESCRIPTIONDATENO.

TOTALPER ONETOTALSPAREWORKING

MARK PARTICULARS MATERIAL

3RD ANGLE

PROJECTION

çÇÉGÉlÉãÉMÅ[ÉVÉXÉeÉÄïî

ót êî

Ishikawajima-Harima Heavy Industries Co., Ltd.

PROJECTION

1ST ANGLE

çT

ï™ î‘

DRAWING

NO.

REV

JOB

NO.

SCALE

1

çá åv

îzïzêÊ


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


Photos


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.


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


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.


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.


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.


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


Rotating Coil Stand

AC servo-motor with encoder (up to 600 RPM)


What’s next?

•Finish magnetic field measurement system

•Fabricate third model

•Sextupole?

•Octpole?

•more?


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.

Permanent Magnets Y. Iwashita Kyoto University. PMQ with saturated iron pole B=2Br (1-r 1 /r 2 ) cos...

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