Improvements in Iron Dominated Magnets(continued) - Comparison at 0.04 T (400G)

Data from

Bruce Brown, FNAL.

Can one can go to field as low as to 0.04 T for injection (rather than 0.1)?

If yes from field quality point of view, then how about the accelerator physics (AP) issues?

Old main ring dipole

(at 0.04 T)

FNAL Main Ring Dipoles

Aperture: 3 inch X 5 inch

Sextupole at 1 inch

(40% of horizontal aperture)

<b2> ~ 1 ; s(b2) ~1.6

FNAL Main Injector Dipoles

Aperture: 2 inch X 6 inch

Sextupole at 1 inch

(33% of horizontal aperture)

<b2> ~ 1.2 ; s(b2) ~0.08

*Harmonic measurements are reliable up to b6 (14 pole), as per Brown.

New main injector dipole

(at 0.04 T)

Improvements in Iron Dominated Magnets (continued) - Comparison at 0.04 T (400G)