The Mechanical and Thermal Design for the MICE Focusing Solenoid Magnet System

Self Cite

Abstract-The first superconducting magnets to be installed in the muon ionization cooling experiment (MICE) will be the tracker solenoids. The tracker solenoid module is a five coil superconducting solenoid with a 400 mm diameter warm bore that is used to provide a 4 T magnetic field for the experiment tracker module. Three of the coils are used to produce a uniform field (up to 4 T with better than 1 percent uniformity) in a region that is 300 mm in diameter and 1000 mm long. The other two coils are used to match the muon beam into the MICE cooling channel. Two 2.94-meter long superconducting tracker solenoid modules have been ordered for MICE. The tracker solenoid will be cooled using two-coolers that produce 1.5 W each at 4.2 K. The magnet system is described. The decisions that drive the magnet design will be discussed in this report.

Section: The Muon Ionization Cooling Experimentsmentioning

confidence: 99%

The Design Parameters for the MICE Tracker Solenoid

Green

Chen

Juang

et al. 2007

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“…The cooling channel for MICE consists of three types of solenoid magnets; 1) the three focusing magnets that are around the liquid hydrogen absorbers [3], 2) the two coupling magnets that surround the RF cavities that re-accelerate the muons to restore their longitudinal momentum [4], and 3) the two spectrometer magnets that are used to analyze the muon beams entering and leaving the cooling channel [5].…”

Section: Introductionmentioning

confidence: 99%

The Design and Construction of the MICE Spectrometer Solenoids

Wang

Wahrer

Taylor

et al. 2009

Abstract-The purpose of the MICE spectrometer solenoid is to provide a uniform field for a scintillating fiber tracker. The uniform field is produced by a long center coil and two short end coils. Together, they produce 4T field with a uniformity of better than 1% over a detector region of 1000 mm long and 300 mm in diameter. Throughout most of the detector region, the field uniformity is better than 0.3%. In addition to the uniform field coils, we have two match coils. These two coils can be independently adjusted to match uniform field region to the focusing coil field. The coil package length is 2544 mm. We present the spectrometer solenoid cold mass design, the powering and quench protection circuits, and the cryogenic cooling system based on using three cryocoolers with re-condensers.

“…The place where the reduction of muon momentum occurs is the absorber focus coil (AFC) module [2]. The AFC module consists of a two-coil superconducting magnet that surrounds an absorber [3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Magnetic Field on the Position of HTS Leads and the Cooler in the Services Tower of the MICE Focusing Magnet

Green

Yang

Cobb

et al. 2008

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Abstract-The MICE focusing solenoids have three 4 K coolers (two for the superconducting magnet and one for the liquid absorber) and four HTS leads that feed the current to the focusing coils. The focusing solenoids produce large radial external fields when they operate with the polarity of the two coils in opposition (the gradient or flip mode). When the MICE focusing coils operate at the same polarity (the solenoid or nonflip mode), the fields are much smaller and parallel to the axis of the solenoid. The worst-case magnetic field affects the selection of the cooler and the HTS leads. This magnetic field can also determine the height of the service towers that house the three coolers and the four HTS leads. This paper shows the criteria used for Cooler selection, HTS lead selection, and the position of both the cooler and leads with respect to the solenoid axis of rotation.