mba magnets multibend achromat magnets 9/27/2013 review by mark jaski
TRANSCRIPT
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
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1.000
0.0
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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
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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
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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?
Mark Jaski Accelerator Systems Division Magnetic Devices Group5
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
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Add end shims to pole tips
Mark Jaski Accelerator Systems Division Magnetic Devices Group6
9/2013
Add end shims to pole tips
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9/2013
Add end shims to pole tips
Mark Jaski Accelerator Systems Division Magnetic Devices Group8
9/2013
Add end shims to pole tips
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9/2013
Add end shims to pole tips
Mark Jaski Accelerator Systems Division Magnetic Devices Group10
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
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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
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9/2013
Case 3: Quadrupole and Sextupole 40 mm apartMAX IV style with side cut
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9/2013
Case 4: Quadrupole and Sextupole 40 mm apartMAX IV style with half side cut
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9/2013
MAX IV multipoles
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-100
-50
0
50
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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
Mark Jaski Accelerator Systems Division Magnetic Devices Group16
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
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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)
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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
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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
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