Flatcoil systems for measurements of Fermilab magnets

Magnetic field measurements of Fermilab main injector dipoles

“…The measurements performed at MTF are grouped according to the data acquisition requirements into rotating coil HARMONICS, FLATCOIL [7], and POINTSCAN.…”

Field shape of the accumulator LDA dipoles

“…Additional plots were examined which s h o wed that the mean and RMS of the higher order polynomial coe cients fell exponentially vs. the t width at a xed t order. Thus, in dramatic fashion, we see illustrated a non-convergent series 3 .…”

“…Table 4 presents, as does Table 3, the average and standard deviation of 3 We mean the series of ts, not the series of terms in the t, as normally intended in the mathematical sense of convergence. Table 4: Average and RMS of results from polynomial ts expressed as normal harmonics at a reference radius of 1 inch.…”

Results on Fermilab Main Injector Dipole measurements

“…A rotating coil Harmonics system measures both eld strength and eld shape at selected currents by i n tegrating the changes with angle of the ux generated in suitable coil combinations [4] [6]. A Flatcoil [7] system measures the shape of the eld by i n tegrating ux changes while translating a coil transverse to the beam direction. It determines magnet eld strength by i n tegrating the ux changes during ramping 1 .…”