Multi-Bend-Achromat (MBA) Magnets · MBA/SCU Present. The APS Upgrade will produce the world’s...

Multi-Bend-Achromat (MBA)Magnets

Mark JaskiMechanical EngineerAccelerator Systems Division/Magnetic Devices Group

12/2014

Outline

Multi-Bend-Achromat (MBA) Functional Requirements Document

– Sector Layout– Types of Magnets– Magnet requirements– Design Parameters

Magnet Designs Coil Designs Assembly concepts

Mark Jaski Accelerator Systems Division Magnetic Devices Group2

12/2014

The APS Upgrade: The world’s leading high-brightness hard x-ray storage ring


MBA/SCU

Present

The APS Upgrade will produce the world’s leading high-brightness hard x-ray storage ring

2-3 order-of-magnitude increase in: BrightnessCoherent fluxNano-focused flux

Operation with round beams

APS-U ushers in a generational leap in storage ring performance

X (µm)-400 -200 0 200 400

400

200

0

-200

-400

Y (µ

m)

-400 -200 0 200 400

400

200

0

-200

-400

X (µm)

Y (µ

m)

APS Today APS Upgrade

This slide copied from J. Kerby’s presentation

12/2014

Multi-Bend-Achromat (MBA)


two dipole magnets – double-bend-achromat

Seven dipole magnets – multi-bend-achromat (MBA)

These images copied from J. Kerby’s presentation

12/2014

Multi-Bend-Achromat (MBA)

To go to lower emmitance. Requires stronger magnets Smaller magnet gaps. Tighter tolerances. Small gaps between vacuum

chamber and magnet poles and magnet coils.


1 mm gaps

APS MBA

Dipole gap 57.20 26.00Quadrupole pole tip radius 39.96 13.00Sextupole pole tip radius 49.00 14.00

mm

16 mm

10 mm

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Functional Requirements DocumentSector Layoutwith block diagram showing major components


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Functional Requirements Document9 Magnet Types1320 Total Storage Ring Magnets


L-Bend magnetsQ-Bend magnets

Not PresentedHere

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Functional Requirements DocumentDipole magnet requirements


M1

M2

M3

M4

Provided by M. Borland

12/2014

Functional Requirements DocumentQuadrupole magnet requirements


Provided by M. Borland

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Functional Requirements DocumentSextupole magnet requirements


The strengths of the sextupole magnets repeats every other sector.Provided by M. Borland

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Functional Requirements DocumentField Quality


Magnet Field QualityB0 is the dipole

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MBA V6 Quadrupole Magnets


Q1 Quadrupole MagnetVanadium permendur pole tips

Q2 through Q6 Quadrupole MagnetsSteel pole tips

238 mm long

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Field Quality in a Quadrupole Magnet


Hyperbolic curve y=r2/(2x) for an ideal quadrupole magnet

x

y

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Field Quality in a Quadrupole Magnet


Magnet shims for quadrupolemagnet to improve field quality

Hyperbolic curve y=r2/(2x) for an ideal quadrupole magnet

10 mm

x

y

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MBA V6 Quadrupole MagnetsSaturation curve – steel only holds so much field


0.00

5.00

10.00

15.00

20.00

25.00

0 50 100 150 200 250 300

B' (T

)

CURRENT (A)

Q1 Current ScanQuad_int Max Operating Current

80.7% magnet efficiencyB1 B5 B9 B13

10000.0 3.2 -4.2 -2.5

12/2014



Q1 Quadrupole Magnet at maximum current

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Q7 and Q8 quadrupole magnets. Use vanadium permendur pole tips

because of high field (98.9 T/m) Do not use long pole tips. This is because it is a combined

function magnet producing both a vertical and horizontal dipole field as well as a quadrupole field.

Magnet efficiency must be kept to a maximum.

The shorter pole tip produces a larger field at high efficiency than a long pole tip at the same efficiency. Q8 Quadrupole Magnet

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MBA V6 Sextupole Magnets


S2 Sextupole MagnetVanadium permendur pole tips

S1, S3 Sextupole MagnetSteel pole tips

256 mm longHas both vertical and horizontal corrector coils

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MBA V6 Sextupole Magnetswhole coil shown


How does a six pole magnet produce a dipole field?

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MBA V6 Sextupole MagnetsSextupole coil removed exposing dipole coils



12/2014

MBA V6 Sextupole MagnetsSextupole Dipole coils


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MBA V6 Sextupole MagnetsSextupole Vertical Dipole coils



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MBA V6 Sextupole MagnetsSextupole Horizontal Dipole coils



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0.0000

0.0020

0.0040

0.0060

0.0080

0.0100

0.0120

0.0

200.0

400.0

600.0

800.0

1000.0

1200.0

1400.0

1600.0

1800.0

0 20 40 60 80 100 120 140

B (T

-M)

B'' (

T/M

)

CURRENT (A)

MBA V6 Sextupole S2 (VP tips) with corrector currents onB(2)_int Max Operating Current B(0)_int A(0)_int

Look-up tables will be required for both vertical and horizontal correctors

Corrector coils turned on at 10 ampers

98% magnet efficiency

12/2014



S2 sextupole magnet at maximum current

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L-Bend Magnets

Longitudinal gradient dipole magnets. Called L-bend dipole magnets. Field varies along the length


0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.0 0.5 1.0 1.5 2.0 2.5

Dipo

le F

ield

(T)

Length (m)

M1 L-Bend Field Plot

B

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L-Bend MagnetsTapered Pole Gap - Magnet Model


Courtesy of Vladimir Kashikhin of Fermilab

12/2014

L-Bend MagnetsTapered Pole Gap - Field Plot



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L-Bend MagnetsTapered Pole Gap - Selected Parameters



12/2014

L-Bend MagnetsTapered Pole Gap - 3D Model


Created from SAT file from Alexander Makarov of Fermilab

A prototype of this magnet is being built by Fermilab

12/2014

Alternative L-Bend


7 pancakes5 lengths4 turns each

2nd integral trim coils(optional)

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Alternative L-BendField Plot


0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

-1.5 -1 -0.5 0 0.5 1 1.5

B (T

)

z (m)

Alternative L-bend

BSpecified

Adjust lengths to control the integrated field in each section

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Alternative L-BendSelected Parametersand field quality


Optimizing the pole tip will reduce the sextupolecomponent

D_current -236.60 AB0_int -486319 Gauss-cmD_power 1200 WConductor square 8.0 mmConductor hole 5.0 mmFlow rate (@ 90 psi) 0.036 (0.58) l/s (gpm)Temp. rise 8.0 °C

B0_int 10000B1_int 9B2_int -13B3_int 3B4_int -3B5_int 1B6_int 0B7_int 0B8_int 0B9_int 0B10_int 0B11_int 0B12_int 0B13_int 0B14_int 0B15_int 0B16_int 0B17_int 0

Units

12/2014

Alternative L-BendSaturation Curve


93.0

94.0

95.0

96.0

97.0

98.0

99.0

100.0

101.0

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0

Mag

net e

ffic

ienc

y (%

)

Inte

grat

ed D

ipol

e (T

-m)

Current (A)

Alternative L-bend Saturation Curve

dipole_intOperating currentefficiency

98.5% Magnet efficiency

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Alternative L-BendPosition


cm

cm

Insertion length

Minimum good field region (~6 mm)

Electron trajectory

vertex

D_current bend_angle vertex_x vertex_z US_angleA ° mm mm °

-236.6 1.392 8.68 -359.36 0.925

US_angle

The length of the beam path is significant

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Q-Bend

It is a dipole magnet that looks like a quadrupolemagnet.

Produces both dipole and quadrupole fields.

The beam is offset from center.

It has curved pole tips. Pole tips are made of

vanadium permendur.


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Q-BendM4


Vanadium PermendurPole tips

90.6 % magnet efficiency

current_Q 236.48 Acurrent_VD -18.80 AB1_central 56.16 T/mB0_central -0.6708 TQ_power 7884 W#VD_power 660 Wx_offset -12.53 mmsagitta 1.412 mmbend_angle 1.126 degreesvertex -1.037 mm

Electron Trajectory

Curved tips

12/2014

Q-BendM4


0

0.02

0.04

0.06

0.08

0.1

0.12

0

10

20

30

40

50

60

70

0 50 100 150 200 250 300

Dip

ole

field

(T)

Qua

drup

ole

Fiel

d (T

/m)

current (A)

M4 Saturation Curve (VP pole tips)

Quadmax operatingdipole

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Q-BendM4


90.6 % magnet efficiency

2.46 T max

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Q-Bend

M4. Field quality. At maximum field.


Vanadium Permendur90.6 % magnet efficiency

B0_int 10000.0B1_int -8374.2B2_int -144.7B3_int -7.5B4_int 5.4B5_int -0.1B6_int 1.1B7_int -0.9B8_int -3.9B9_int 0.3B10_int 6.6B11_int -1.8B12_int -10.2B13_int 12.3B14_int -2.5B15_int -5.1B16_int 2.1B17_int 4.5

Units

Rre

f = 1

0mm

12/2014

Quadrupole CoilWater cooled


Coils are epoxy impregnated in an enclosed potting mold to obtain high dimensional accuracy.

Model created by Aric Donnelly

12/2014

Quadrupole CoilModel of copper only


Model created by Aric Donnelly

12/2014

Quadrupole CoilModels of winding and potting tooling


Winding Tooling Potting Tooling

12/2014

Demo-Modular-Multiplet (DMM)


12/2014

Quadrupole Magnet Assemblyfor DMM


12/2014

Quadrupole Sextupole Quadrupole (QSQ)


12/2014

DMM mounted on a granite plinth


Rendering by Bill Turner

Multi-Bend-Achromat (MBA) Magnets · MBA/SCU Present. The APS Upgrade will produce the world’s...

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