mba magnets multibend achromat magnets 9/27/2013 review by mark jaski

MBA MagnetsMultiBend Achromat Magnets

9/27/2013 Review

By Mark Jaski

9/2013

y = 101.9x - 7.0764

y = 79.679x - 5.1832

y = 0.9883x - 0.0425

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

0.900

1.000

0.0

10.0

20.0

30.0

40.0

50.0

60.0

0.150 0.200 0.250 0.300 0.350 0.400 0.450 0.500 0.550 0.600 0.650

Effec

tive

leng

th (m

)

Inte

gral

of q

uadr

upol

e fie

ld (T

)

Overall Length (m)

MBA Quadrupole at 98% Efficiency13 mm half gap

VP quad integral

Steel quad integral

VP Eff length

Steel Eff length

Linear (VP quad integral)

Linear (Steel quad integral)

Linear (VP Eff length)

Avoid OAL less than .150 m

Core length = (OAL-.058)m

Quarupole integral field vs length (updated)

9/2013

y = 7246.1x - 447.45

y = 5408.9x - 325.25

y = 0.9837x - 0.0511

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

0.400

0.450

0.500

0

200

400

600

800

1000

1200

1400

1600

1800

2000

0.150 0.170 0.190 0.210 0.230 0.250 0.270 0.290 0.310

Effec

tive

leng

th (m

)

Inte

gral

of s

extu

pole

fiel

d B'

' (T/

m)

Overall Length (m)

MBA Sextupole at 98% Efficiency13 mm half gap

VP sext integral

steel sext integral

VP Eff length

steel Eff length

Linear (VP sext integral)

Linear (steel sext integral)

Linear (VP Eff length)

Avoid OAL less than .150 m

Core length = (OAL-.061)m

Sextupole integral field vs length (updated)

9/2013

Central field as a function of OAL (VP)

Mark Jaski Accelerator Systems Division Magnetic Devices Group4

6500660067006800690070007100720073007400

0 1 2 3 4 5

Cent

ral fi

eld

(T/m

**2)

OAL (m)

MBA Sextupole at 98% Efficiency13 mm half gap

B2 = (7246.1*OAL - 447.45)/(0.9837*OAL - 0.0511)Peak Field = 7366.2 T/m**2

0

20

40

60

80

100

120

0 0.2 0.4 0.6 0.8 1 1.2

Cent

ral fi

eld

(T/m

)

OAL (m)

MBA Quadrupole at 98% Efficiency13 mm half gap

B1 = (101.9*OAL - 7.0764)/(0.9883*OAL - 0.0425)Peak Field = 103.1 T/m

2D analysis is not effective unless the quadrupole is over 1 m long.

2D analysis is not effective unless the sextupole is over 3 m long.

(Integrated field)/(effective length) = Peak field

9/2013

How close can two magnets get?


0.2% quad

d

213 mm OAL quad186 mm OAL sext

-400-350-300-250-200-150-100

-500

50100

0 50 100 150 200

Inte

grat

ed fi

elds

coeffi

cien

ts c

gs

Distance between magnets (mm)

Sextupole and Quadrupole Turned On

B0

B1

B2

B3

B4

B5

B6

B7

B8

9/2013

Add end shims to pole tips


9/2013



9/2013



360000365000370000375000380000385000390000395000400000405000

0 0.5 1 1.5 2 2.5

Inte

grat

ed fi

eld

(G)

End Shim Length (cm)

Quadrupole 98% efficientAdd end shims to pole tips

9/2013

Case 1: Quadrupole and Sextupole 40 mm apart


coeff value unitB0 32 Gauss-cm**1B1 160291 Gauss-cm**0B2 -48321 Gauss-cm**-1B3 24 Gauss-cm**-2B4 7 Gauss-cm**-3B5 -3033 Gauss-cm**-4B6 -18 Gauss-cm**-5B7 4 Gauss-cm**-6B8 3328 Gauss-cm**-7

Conventional quad-sext

9/2013

Case 2: Quadrupole and Sextupole 40 mm apartMAX IV style


9/2013

Case 3: Quadrupole and Sextupole 40 mm apartMAX IV style with side cut


9/2013

Case 4: Quadrupole and Sextupole 40 mm apartMAX IV style with half side cut


9/2013

MAX IV multipoles


-100

-50

0

50

100

150

200

250

0 1 2 3 4 5

Inte

grat

ed fi

eld

Coeffi

cien

ts in

cgs

case

Compare MAX IV casesonly sext turned on

B0

B1

B2

B3

B4

B5

B6

B7

B8

-100

0

100

200

300

0 1 2 3 4 5

Inte

grat

ed fi

eld

Coeffi

cien

ts in

cgs

case

Compare MAX IV casesquad and sext turned on

B0

B1

B2

B3

B4

B5

B6

B7

B8

-100

-50

0

50

100

150

200

250

0 1 2 3 4 5

Inte

grat

ed fi

eld

Coeffi

cien

ts in

cgs

case

Compare MAX IV casesonly quad turned on

B0

B1

B2

B3

B4

B5

B6

B7

B8

-40

-30

-20

-10

0

10

20

0 1 2 3 4 5

Inte

grat

ed fi

eld

Coeffi

cien

ts in

cgs

case

Compare MAX IV casesquad and sext turned on

A0

A1

A2

A3

A4

A5

A6

A7

A8

Quadrupole12 pole

dipolesextupole 18 pole

Skew dipoleSkew sextupole

Skew 12 pole

Skew quad

9/2013

Much more work to do with the MAX IV style

Results here are preliminary Results here were not intended to match the existing lattice. Results here are just

to take an initial look at the MAX IV style of magnet assembly Initial results appear there is no large issues. A skew quad added to the sextupole will definitely produce a horizontal dipole

when there is a side cut. Need to add the correctors to the quadrupole and sextupole magnets Future models

– quad doublet– straight multiplet


9/2013

Possible future R&D work

Is there any R&D work we feel necessary. Looking for input from all Provide the following by mid-October

– scope/goal– any assumptions made– costs in terms of labor and M&S– justification for doing the work– what determines when the work is complete– major milestones– completion date


9/2013

Ongoing tasks and assignments

Update the Working assumptions document (everyone)– Suk and Vladimir need to update parameters– Mark needs to add trims and update trim parameters for quad and sextupole magnets

Analysis– Longitudinal gradient dipole magnets (Vladimir)

• Confirm the operating current with power supplies (ask Ju Wang if your currents are Okay)– Transverse gradient dipole magnets (Suk)

• Look at possible combined function (quad/dipole) rather than a quadrupole magnet that requires transverse motion

– Quadrupoles (Mark)• Optimize pole tips• Add trims• Transient (ripple current)• Size VP tips• Side chamfers• Tip chamfers (minimize 12 pole)• Size the water cooling hole

– Fast correctors (who)


9/2013

Ongoing tasks and assignments (continued) Analysis (continued)

– Sextupoles (Mark)• Add trims• Size VP tips• Side chamfers• Tip chamfers

– MAX IV type magnet mounting (is this the right way to go?)• quad doublet (Mark)• straight multiplet (Mark)• FODO Section (who)

– Check each others work R&D project

– Engineering, designer, purchasing Costing (TJ and Elmie) Scheduling Documents

– Engineering specification documents– Statement of work


9/2013

Ongoing tasks and assignments (continued) Drawing lattice layout for vacuum group and girder group

– We need to supply box drawings of magnets to APS designers
