Notes on undulator presentation:
HTS undulator:
- Current in superconducting disks is induced by lowering field of solenoid around the undulator. Operation takes about 10 hours.
- Faster change of K possible by changing solenoid field - this requires compensating solenoids up- and downstream. Then would may take 10-15 min. (still not suitable for quick scans).
- The limit is given by heat dissipation, about 1 T per hour (therefore about 10% field change possible in 15 min.)
- All in all not very practical for Porthos!
Cryo-Apple-X:
- The "elefant". Very powerful, but hard to realize, very complex, likely to be failure-prone in operation (lots of movable parts in a tiny space). Higher complexity with respect to Athos ("factor 2-3").
- Looks like too complex and too difficult to operate for routing operation in Porthos.
SCAPE
- Pursued by Argonne and Berkeley.
- Argonne version (Material?, 15 mm period, 5.3 mm aperture) gives K value of 1.70 (comparable to Aramis, but you have polarization control!)
- Berkeley version (NbTi, 15 mm period, 5.3 mm aperture) gives K value of 1.72.
- By going to NbSb we could easily double the field / K value (at the cost of higher manufacturing complexity).
Helical SCU
- Simplest design. Helicity is given, no way to change it (cannot flip between C+/C-)
- A period of 12 mm and a gap of 6 mm are realistic assumptions.
- APS also does NbSb planar design - with this configuration we could in principle go to smaller gaps! (But suffer from a longer gain length).
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