Strength and shape of the magnetic field of the Fermilab Main Injector dipoles

Abstract

MAGNET STRENGTHMeasurements of 230 6-meter and 136 4-meter dipoles constructed for the Fermilab Main Injector were carried out as part of the magnet production effort. An automated measurement system provided data on magnetic field strength and shape using several partially redundant systems. Results of these measurements are available for each individual magnet for use in accelerator modelling. In this report we will summarise the results on all of the magnets to characterise the properties which will govern accelerator operation.Groups 4 and 5 define our nominal magnet strength at each current.The mean strength, including me 4-m magnets weighted at 2/3 of the 6-m magnets, was calculated for each current. Deviations from that strength (for the 6-m magnets) or from 2/3 of that strength (for the 4-m magnets) are normalized to the nominal strength of the 6-m magnets.These deviations are quoted here in "units" of parts in 104.

Magnetic field measurements of Fermilab main injector dipoles

“…These efforts were supported by magnet measurements with existing [2] and newly commissioned [3][4] [5] systems at the Fermilab Magnet Test Facility (MTF) 1 . A summary of these efforts with complete references was recently presented [6] which covers most magnet production and accelerator operation issues. We will concentrate on issues of magnet properties and measurement system characterization which have not been previously reported.…”