The Use of Small Coolers in a Magnetic Field

Green, Michael A.; Witte, Holger

doi:10.1063/1.2908487

Cited by 17 publications

(14 citation statements)

References 3 publications

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“…Running the first stage of the cooler at the lowest possible temperature means that the temperature margin at the top of the HTS leads will be maximized. The helps protect the HTS lead from quenching when the magnet discharges during a power failure [7] V. COOLER SELECTION AND COOLER LOCATION Cooler selection is an important part of the design of the magnet when the cooler must operate in a magnetic field [8]. There are two types of coolers that are commercially available for cooling the magnets in MICE.…”

Section: The Hts Lead and Magnetic Fieldmentioning

confidence: 99%

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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

IEEE Trans. Appl. Supercond.

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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.

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Section: The Hts Lead and Magnetic Fieldmentioning

confidence: 99%

“…Keeping the top of the HTS leads cold while discharging the magnet during a power failure is a critical issue [8]. A rapid discharge system that discharges the AFC magnets in less than 3600 seconds is needed to protect the HTS leads in the magnet, during a power failure.…”

Section: The Location Of the Afc Coolers And Leadsmentioning

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

IEEE Trans. Appl. Supercond.

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“…The field in the motors is between 0.16 T and 0.20 T, perpendicular to the axis of the motor. The motor can be locally shielded for operation in the field up to 0.5 T. If not shielded, it can also be moved to a location up to 1 meter from the rest of the cold head assembly, but the cooler capacity is reduced about 10 percent [11]. The field in the space of 1 meter distance away from the cold head assembly is lower than 0.05T, which is acceptable for the motor.…”

Section: Vacuum Pumpmentioning

confidence: 99%

The Helium Cooling System and Cold Mass Support System for the MICE Coupling Solenoid

Wang

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-The MICE cooling channel consists of alternating three absorber focus coil module (AFC) and two RF coupling coil module (RFCC) where the process of muon cooling and reacceleration occurs. The RFCC module comprises a superconducting coupling solenoid mounted around four conventional conducting 201.25 MHz closed RF cavities and producing up to 2.2T magnetic field on the centerline. The coupling coil magnetic field is to produce a low muon beam beta function in order to keep the beam within the RF cavities. The magnet is to be built using commercial niobium titanium MRI conductors and cooled by pulse tube coolers that produce 1.5 W of cooling capacity at 4.2 K each. A self-centering support system is applied for the coupling magnet cold mass support, which is designed to carry a longitudinal force up to 500 kN. This report will describe the updated design for the MICE coupling magnet. The cold mass support system and helium cooling system are discussed in detail.

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“…This plot shows that the magnet field outside of the long coupling coil is much lower than the field at the same radius for a short coupling coil. The field on the outside of the magnet affects HTS current leads [6] and the 4.2 K coolers [7] that might be used to cool the coupling magnet. For an experiment such as MICE, superconductor represents fifteen to twenty percent of the cost of the coupling coil.…”

Section: Short and Long Coupling Coilsmentioning

confidence: 99%

The Effect of Extending the Length of the Coupling Coils in a Muon Ionization Cooling Channel

Green¹

2008

AIP Conference Proceedings

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Abstract. RF cavities are used to re-accelerate muons that have been cooled by absorbers that are in low beta regions of a muon ionization cooling channel. A superconducting coupling magnet (or magnets) are around or among the RF cavities of a muon ionization-cooling channel. The field from the magnet guides the muons so that they are kept within the iris of the RF cavities that are used to accelerate the muons. This report compares the use of a single short coupling magnet with an extended coupling magnet that has one or more superconducting coils as part of a muon-cooling channel of the same design as the muon ionization cooling experiment (MICE). Whether the superconducting magnet is short and thick or long and this affects the magnet stored energy and the peak field in the winding. The magnetic field distribution also affects is the muon beam optics in the cooling cell of a muon cooling channel.

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The Use of Small Coolers in a Magnetic Field

Cited by 17 publications

References 3 publications

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

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

The Helium Cooling System and Cold Mass Support System for the MICE Coupling Solenoid

The Effect of Extending the Length of the Coupling Coils in a Muon Ionization Cooling Channel

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