1. Conceptual design of superconducting correctors for Hi-Lumi Project
F. Toral - CIEMAT
CIEMAT, Jan. 28th, 2013

2. Conceptual design: superferric
Due to the moderate requirement on magnet strength, a superferric design is feasible.
The superferric layout has three important advantages:
1) The coils are placed beyond the aperture diameter and wires are concentrated in a slot, compared to the broad extension of a cos-theta type coil. Both features yield higher radiation resistance.
2) The fabrication complexity and cost is lower, because coils are flat and besides the wire positioning tolerance is relaxed.
3) It is very well suited for short magnets with broad aperture.
1.5 T option
Total length (m)
3,03
WP3 proposal
Superferric option
WP2 requirements
Order
Aperture
Int Strenght at 50 mm
Int strength
Length
Strenght
Pole field
ratio
(adim)
(mm)
(T m)
(T/m^(n-2))
(m)
(T/m^(n-1))
(T)
MCQSX
Skew 2
150
1,00
20,0
1,000 20
1,500
MCSX
Normal 3
0,06
24,0
0,090
267
MCSSX
MCOX 4
0,04
320,0
3556
MCOSX
MCDX 5
0,03
4266,7
47407
0,67
MCDSX
0,02
1,33
MCTX 6
0,08
252839,5
0,400
632099
0,12
0,66
MCTSX
56888,9
0,89 2

3. Conceptual design: superferric
Vacuum impregnated coils
Laminated ARMCO iron yoke
Alignment by stainless steel keys
Radiation resistance:
Polyimide insulated NbTi wire
CTD 422B: a blend of cyanate ester and epoxy resin
Stainless steel coil spacers
Duratron 2300 PEI connection plate and ancillary pieces
Insulating sleeves made of polyurethane and glass fiber

4. Conceptual design: superferric4

5. Conceptual design: superferric5

6. First magnetic calculations
Full 3-D simulation has been performed using Roxie.
It is not an optimal solution, it is just a proof of principle.
The separation between mechanical lengths is 40 mm. Connections are made in 20 mm of longitudinal length. Overall length is m.
A nonlinearity of the transfer function up to 5% is assumed as non problematic.
Roxie simulation
Total length (m)
2,958
Superferric option
WP2 requirements
Order
Aperture
Int Strenght at 50 mm
Int strength
Mech length
Strength
Pole field 2-D
Saturation
Coil length
Coil straight length
Block current
Number of turns
Current
Wire bare diameter L
required/given
(mm)
(T m)
(T/m^(n-2))
(m)
(T/m^(n-1))
(T)
(adim)
(A)
(H)
MCQSX
Skew 2
150
1,014
0,914
1,75
1,04
0,896
0,864
53000
346
153,2
0,7
1,99
1,00
1,01
MCSX
Normal 3
0,060
0,136
1,25
0,116
0,092
24000
228
105,3
0,5
0,167
0,06
MCSSX
MCOX 4
0,040
0,140
1,02
0,120
0,096
17400
165
105,5
0,093
0,04
MCOSX
MCDX 5
0,170
1,40
1,05
0,150
0,126
0,138
MCDSX
0,02
2,00
MCTX 6
0,119
0,608
1,65
0,588
0,564
16600
100,6
0,6
0,12
MCTSX
0,020
0,144
0,124
0,100
14000
84,8
0,111 6

7. First magnetic calculations: octupole
The fringe field goes beyond the mechanical length of the magnet.
No significant cross-talk between the magnets is expected, but must be checked. 7

8. Conclusions
A baseline design of superferric magnets complies with the specifications.
Some open points are still pending:
Cross-talk between adjacent magnets.
Maximum allowable non-linearity of the transfer function.
Nominal current (that is, available power supplies and leads).
The framework for this Collaboration needs to be defined. 8