adjustable strong permanent magnet for final focus quadrupole
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ADJUSTABLE STRONG PERMANENT MAGNET FOR FINAL FOCUS QUADRUPOLE. T. MIHARA, Y.IWASHITA Kyoto University M. KUMADA N.I.R.S. C.M.Spencer S.L.A.C. The first prototype of “superstrong” Permanent Magnet Quad. Soft iron. PM. Axial view. Cut plane view. PHOTO.

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adjustable strong permanent magnet for final focus quadrupole
ADJUSTABLE STRONG PERMANENT MAGNET FOR FINAL FOCUS QUADRUPOLE

T. MIHARA, Y.IWASHITA Kyoto University

M. KUMADA N.I.R.S.

C.M.Spencer S.L.A.C.

the first prototype of superstrong permanent magnet quad
The first prototype of “superstrong” Permanent Magnet Quad.

Soft iron

PM

Axial view

Cut plane view

PHOTO

Integrated strength GL=28.5T (29.7T by calc.)

magnet size. f10cm

bore f1.4cm

Field gradient is about 300T/m

slide3

Double Ring Structure –Adjustable PMQ-

First Quadrant shows the flux plot.

Pole material

OFF

ON

Permanent magnet

The double ring structure

PMQ is split into inner ring and outer ring. Only the outer ring is rotated 90around the beam axis to vary the focal strength.

slide4

Definition of “Switched-On” Length

16 series of outer ring switching

ON

Cut PlaneView

slide5

Design Parameter of the Adjustable PMQ

material

dimensions

strength

an adjustable pmq
An adjustable PMQ

Outgoing beam line is 7cm distant from incoming beam line.

Outer ring is rotated by DC motors.

slide7

Measurement with Rotation Coil @SLAC

Rotating Coil

  • Temperature21.7±0.2C.
  • Preliminary data:
  • integrated strength
  • center shift by changing strength
  • skew rotation angle by changing strength
slide8

Strength variability

Integrated strength is proportional to the “switched-on ” length

It allows us simple adjustment

This PMQ can generates GL 1/5 of the maximum GL.

magnetic center shift when integrated gradient is changed
Magnetic Center Shift when Integrated Gradient is Changed

X center and Y center shift when GL is changed. Mechanical adjustment may reduce shift.

skew rotation angle by changing strength
Skew rotation angle by changing strength

Fig. shows the skew rotation angle as the function of switched-on length.

This will be reduced by adjustment.

Y=0.0085x+1.365

8cm_on

4cm_on

1cm_on

weakest

2cm_on

1,2,8cm_on

Y=0.01x

strongest

options for various l x ing angles
Options for Various L* & X’ing Angles

NBS (For Head on)

SBS (For 2mrad)

MBS (For 7mrad)

LBS(2nd prototype)(For 20mrad)

NBS=No Beam Separation, SBS=Small Beam SeparationMBS=Medium Beam Separation, LBS=Large Beam Separation

summary
Summary
  • “Double ring ” Adjustable PMQ was fabricated. This PMQ generates GL from 3.48T to 24.2T by 1.4T step.
  • Magnetic center shift was measured; good reproducibility was observed.
  • Measurement of Skew rotation angle shows the relative rotations of the rings.
  • Shifts and rotations will be adjusted.
  • Configurations can be changed to meet with various beam separations .
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