1. RESISTIVE MAGNETS Maintenance, Upgrades

2. Jim O’Reilly:
RES/MAG
Maintenance
POWERED: Magnet Cells
J. Chen, Jim O’Reilly, J. Toth, S.T.Bole, S. Gundlach, Chris Ray, Nicole Walsh
Chris Ray Nicole Walsh
7 Resistive Magnets & 1 Hybrid presently. 4 Upgrades, 1 Series-Connected Hybrid and a Split are planned.
Cell 2
 SPLIT
2010
Cell 4
195mm 
19.5 T
Cell 6
52mm 
25T
12ppm
Cell 8
35T
36T
~2010
Cell 10   
Cell 12
33T
2009
Cell 14
36T SCH
2012
Cell 16
Cell 1
Cell 3
Cell 5
50mm 
31T
32 T
Cell 7 
28T
50ppm
Cell 9
50 mm 31T
32T
~2011
Cell 11
Cell 13 
Test Stand I
Test Stand II
Cell 15
Hybrid
45T
3 PS
Maintenance past year
11 coils stacked, 6 coils installed.
Complete set of spare coils on-hand.!
Magnet bores are 32 mm unless noted otherwise.

3. Resistive Magnet Solenoids Worldwide
Black = Tallahassee
Red = Nijmegen
Blue = Grenoble
= 3 cm bore
= 5 cm bore

4. Upgrades Planned for Grenoble and Nijmegen
Grenoble: using 24 MW expect to attain higher field than our 20 MW magnets.
Nijmegen: By building 800 mm OD magnets expect to attain higher field than our 600 mm OD magnets

5. Proposed NHMFL Upgrades
28 MW New Magnet
28 MW New Magnet
Short-Term: Improved stacking pattern using existing disks and housings will keep us competitive.
Long -Term: Utilizing available power, building larger housings and new magnets will keep us ahead of the competition. Need Funding

6. Total field increases from 35T to 36T.
32 mm Bore Magnet Upgrade A1 A2
Existing
Planned
Disks/turn 6
5.54 7
6.53
Current Density (A/mm2)
714
770
412
440
Power Density (W/mm3) 14
16.5
4.59
5.25
Stress (MPa)
668
647
642
621
Field Contribution (T)
10.0
10.7
10.1
Total field increases from 35T to 36T.
More complicated stating pattern attains fractional disks per turn and higher efficiency magnets. This approach has already been employed in the 45 T hybrid insert.
32-mm and 50-mm magnets will be upgraded by ~1 T in coming years as the existing magnet wear out.
This will enable us to keep up with other labs at minimal cost.

7. Total field increases from 31T to 32T.
50 mm Bore Magnet Upgrade A1 A2
Existing
Planned
Disks/turn 6
4.62 8
6.59
Current Density (A/mm2)
534
592
402
423
Power Density (W/mm3)
7.73
9.49
4.27
4.72
Stress (MPa)
623
635
648
646
Field Contribution (T)
7.1
7.8
9.1 10
Total field increases from 31T to 32T.

8. 28 MW New Magnet Concept 400mm 575mm 600mm OD 1000mm OD 20MW – 35T
Requires Funding

9. Summary MagLab resistive magnets unmatched worldwide!
Competition Is Gaining! (24 MW vs 20 MW)
Short Term Plan – More efficient stacking using existing disks, housings, etc. to stay competitive
Long Term Proposal – New housings and 28 MW to stay ahead.