AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Permanent Magnet Updates

Y. Iwashita, M. Ichikawa, Y. Tajima, M.Kumada, C.M. Spencer

Kyoto University, NIRS, SLAC

Contents:Brief review of PMQ studyLongitudinal distribution14mradOctupole

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

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)

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2006.12.19 3rd ATF2 project meeting

First prototype (fixed field)

Prototype PMQ Measurement at SLAC

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

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

2006.12.19 3rd ATF2 project meeting

Prototype Magnet

PMQ assembling

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Photos

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

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

2006.12.19 3rd ATF2 project meeting

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

2006.12.19 3rd ATF2 project meeting

Demagnetization by Radiation

Continuous 1mo.(2.6Ms) operation may cause about 0.01[%] of (reversible?) demagnetization on NEOMAX 32EH.

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

300.3%32EH

210.7%39SH

161.8%44H

10.2%47

iHc

[Oe]

Demag. ratio

[/1x1013n/cm2]

Magnet

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

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

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.

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Longitudinal Distribution

Vertical component By measured by a

Group3 Tesla meter.

dz = 2mm, z = 0 ~ 380mm

dx, dy = ±2mm

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Longitudinal DistributionAll ON All OFF

Almost flat: Gmax ~ １９０T/m

Gmin ~ ２９ T/m

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SWL = 4cm SWL = 8cm

Gradient is high at ON region.Magnet gaps of the inner ring affects

the distribution.

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Magnetic field centroid

Cases of

only ８ｃｍ (entrance) ONor

only ４ｃｍ (exit) ON

shows the maximum and minimum.

Centroid location as a function of

SWL

mm

50

-50

AccLab BmSci ICRKyotoUniversity SWL

GL value is proportional to the SWL:

GLmax ~ 38 TGLmin ~ 5.9T

GL value

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

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

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2006.12.19 3rd ATF2 project meeting

4m x 14 mrad=56mm

145

145 145 145 145

30 30 30 30 30 30 30 30 30 30 56

56 56 56 56

200

200 200 200 200

Difficult: less

adjustability and stray field at

extraction line

Direct extension

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Side by Side Quad

D for incoming F for outgoing

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

-60

-40

-20

0

20

40

60

0 20 40 60 80 100

By g=30mmBy g=50mm

dBy/dx g=30mmdBy/dx g=50mm

X [mm]

Strength can be reduced by opening the

gap.

C:\LANL\ML\SBSPMQ\SBSPMQT.AM 12-18-2006 22:51:500

20

40

60

80

100

120

140

160

180

200

0 50 100 150 200 250

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Side by Side Quad

Both D

Strength can be reduced by opening the

gap.

C:\LANL\ML\SBSPMQ\SBSPMQTEVENG30.AM 12-19-2006 0:38:02

0

20

40

60

80

100

120

140

160

180

200

0 50 100 150

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

-60

-40

-20

0

20

40

60

0 20 40 60 80 100

By [T] g=40mmBy [T] g=30mm

dBy/dx [T/m] g=40mmdBy/dz [T/m] g=30mm

By [T]

dBy/dx [T/m]

X [mm]

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

70T/m @ ø30mmOctupole components

tolerable?

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

-80

-60

-40

-20

0

20

40

60

80

0 20 40 60 80 100

By [T] g=40mmBy [T] g=30mmBy [T] gap=30mm w/tip

dBy/dx [T/m] g=40mmdBy/dz [T/m] g=30mmdBy/dx [T] gap=30mm w/tip

By [T]

dBy/dx [T/m]

X [mm]

Both D

Strength can be reduced by opening the

gap.

Side by Side Quad

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

PMO (octupole)

iPMO1616segID=2.0OD=10.0CYCLE=90

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

0 0.2 0.4 0.6 0.8 1

By[G]

By[G]

R[cm]

y = m1*m0^3ErrorValue

62.65818171m1 NA1.7769e+05χ2

NA0.9998R

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Two-piece configuration to dismount.

AccLab BmSci ICRKyotoUniversity

2006.12.19 3rd ATF2 project meeting

Summary

•Almost done with the first adjustable model.

•Baseline changed to 14 mrad...

•Fabricate third model — may be tested in ATF2

•Side by Side usable?

•Octupole for halo folding?