Magnetic Measurements of MICE Stators & PMs Ben Shepherd MICE Target Workshop RAL, 13 December 2011.

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Presentation transcript:

Magnetic Measurements of MICE Stators & PMs Ben Shepherd MICE Target Workshop RAL, 13 December 2011

Contents Stator – Measurements – Comparison to previous results Permanent magnet measurements – New PMs – T1 PMs

Initial scan Along x=y=0 – to determine peak positions and give us a zero offset B0, B1 are transverse; B2 is longitudinal Arbitrary units since not calibrated in all directions

Centre-finding scan At each peak in B2 Fit a quadratic function in x and y: Solve to find minimum field

Results Good agreement between centres measured by transverse and longitudinal fields Centres all within 200µm in x and y

Comparison with other stators Similar spread to T2 Both worse than T3, which had a near- constant offset all the way through My nomenclature (probably inconsistent – sorry!) First stator I measured Second Third (this one was used in ISIS)

Measurements of new PMs Measured eight new PM assemblies in the lab PM mounted on a rotating stage Hall probe attached to spring-loaded holder to keep it at the same distance from the PMs (about 1mm away) Looking for the smallest change in B r with  z 

New PMs – measurement results troughs Mean field Standard deviation Relative standard deviation4.8%4.4%4.5%2.5%6.9%1.2%2.1%3.8% Normalised (0 = best, 1 = worst) peaks Mean field Standard deviation Relative standard deviation2.0%1.1%1.4%0.8%1.5%1.4%0.7%2.4% Normalised (0 = best, 1 = worst) overallSum of two “normalised” rows In each row, the green cell is the best and the red the worst. Magnet #7 has the lowest relative standard deviation for peaks (0.7%) and the second- lowest for troughs (2.1%). So in terms of field uniformity, this is probably the best, followed by #4 and #6.

Measurements of old PMs Used same technique to measure PMs from T1, just removed from ISIS Variation of radial field: 2.1% for troughs, 2.6% for peaks Compared to the new ones – ‘mid-range’