Progress on the Design and Fabrication of the MICE Focusing Magnets

Abstract

Abstract-The Muon Ionization Cooling Experiment (MICE) focusing solenoid magnets focus the muon beam within the MICE cooling channel on a liquid or solid absorber that is within the warm bore of solenoid. The focusing magnet has a warm bore of 470 mm. This magnet consists of two coils 210-mm long that is separated by an aluminum mandrel that is 200 mm long. Each of the coils has its own leads. The coils may be operated in either the non-flip mode (solenoid mode with both coils at the same polarity) or the flip mode (quadrupole focusing mode where both coils are at opposite polarity). This report describes the focusing solenoid magnet design that will be built by the vendor. The progress on the construction of the first of the focusing magnets will also be discussed in this report. Ultimately three of these magnets will be built. These magnets will be cooled using a pair 1.5 W (at 4.2 K) pulse tube coolers.

The Resistance and Strength of Soft Solder Splices Between Conductors in MICE Coils

“…1 shows the three types of normal splices were studied; cold welded butt splices, soldered up-down lap splices, and soldered side-by-side lap splices [3], [4]. The fabricators for the coupling magnet [5] and the AFC magnet [6] have chosen to make their splices at the ends of a layer, so that the splice is a transition from one layer to the next. Therefore, the measurements presented here are for up-down soldered lap splices, which can be used at the ends of a coil layer.…”

Results from the Cooler and Lead Tests

“…The first of the channel magnets to be installed at MICE will be the spectrometer solenoids [3]. The second magnet type to be installed at MICE is absorber focus coil (AFC) module [4]. The third type of magnet to be installed at MICE will be the RF coupling coil modules [5], [6].…”