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

Green, M.A.; Yang, S.Q.; Cobb, J.H.; Lau, W.; Witte, Holger; Baynham, D.E.; Bradshaw, T.

doi:10.1109/tasc.2008.921273

Cited by 9 publications

(11 citation statements)

References 7 publications

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“…For the MICE coupling magnet, the performances of the pulse tube cooler rotary valve motor, the HTS leads and the quench cold diodes are affected by the magnetic field and the magnetic flux line direction [8][9]. The magnetic field of the coil at 210 A is shown in Fig.3.…”

Section: The Magnetic Fieldmentioning

confidence: 99%

Magnetic and Cryogenic Design of MICE Coupling Solenoid Magnet System

Wang

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-The Muon Ionization Cooling Experiment (MICE)will demonstrate ionization cooling in a short section of a realistic cooling channel using a muon beam at Rutherford Appleton Laboratory in the UK. The coupling magnet is a superconducting solenoid mounted around four 201MHz RF cavities, which produces magnetic field up to 2.6 T on the magnet centerline to keep muons within the iris of RF cavities windows. The coupling coil with inner radius of 750mm, length of 285mm and thickness of 102.5mm will be cooled by a pair of 1.5 W at 4.2 K small coolers. This paper will introduce the updated engineering design of the coupling magnet made by ICST in China. The detailed analyses on magnetic fields, stresses induced during the processes of winding, cool down and charging, and cold mass support assembly are presented as well.

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Section: The Magnetic Fieldmentioning

confidence: 99%

Magnetic and Cryogenic Design of MICE Coupling Solenoid Magnet System

Wang

et al. 2009

IEEE Trans. Appl. Supercond.

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“…The coolers must be located so that the magnet induction at the rotating valve motors and HTS leads is less than 0.3 T [2]. As a result, the coolers must be located some distance (~0.3 to 0.5 meters) from the magnet module being cooled.…”

Section: Introductionmentioning

confidence: 99%

Re-Condensation and Liquefaction of Helium and Hydrogen Using Coolers

Green¹,

Weisend²

2010

AIP Conference Proceedings

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A helium liquefier using three 4 k pulse tube cryocoolers AIP Conference Proceedings 1434, 1640 (2012); 10.1063/1.4707096 RE-CONDENSATION AND LIQUEFACTION OF HELIUM AND HYDROGEN USING COOLERS M. A. GreenLawrence Berkeley National Laboratory Berkeley CA 94720, USA ABSTRACTCoolers are used to cool cryogen free devices at temperatures from 5 to 30 K. Cryogen free cooling involves a temperature drop within the device being cooled and between the device and the cooler cold heads. Liquid cooling with a liquid cryogen distributed over the surface of a device combined with re-condensation can result in a much lower temperature drop between the cooler and the device being cooled. The next logical step beyond simple re-condensation is using a cooler to liquefy the liquid cryogen in the device. A number of tests of helium liquefaction and re-condensation of helium have been run using a pulse tube cooler in the drop-in mode. This report discusses the parameter space over which re-condensation and liquefaction for helium and hydrogen can occur.

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Section: Introductionmentioning

confidence: 99%

“…Pulse tube coolers were selected because the coolers must operate in a magnetic field up 0.3 T [8] [9]. Along with the coolers, the high temperature superconducting (HTS) leads must also be able to operate in a magnetic field [9], [10]. The stray field from the MICE magnets determines the type of cooler used, the position of the cooler, and the type of HTS leads that are connected to the cooler first stage at the upper end and the magnet cold mass at the lower end [10].…”

Section: Introductionmentioning

confidence: 99%

Results from the Cooler and Lead Tests

Green¹

2010

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The report presents the results of testing MICE spectrometer magnet current leads on a test apparatus that combines both the copper leads and the high temperature superconducting (HTS) leads with a single Cryomech PT415 cooler and liquid helium tank. The current is carried through the copper leads from 300 K to the top of the HTS leads. The current is then carried through the HTS leads to a feed-through from the vacuum space to the inside of a liquid helium tank. The experiment allows one to measure the performance of both cooler stages along with the performance of the leads. While the leads were powered we measured the voltage drops through the copper leads, through the HTS leads, through spliced to the feed-through, through the feed-through and through the low-temperature superconducting loop that connects one lead to the other.Measurements were made using the leads that were used in spectrometer magnet 1A and spectrometer magnet 2A. These are the same leads that were used for Superbend and Venus magnets at LBNL. The IL/A for these leads was 5.2x10 6 A m -1 . The leads turned out to be too long. The same measurements were made using the leads that were installed in magnet 2B. The magnet 2B leads had an IL/A of 3.3x10 6 A m -1 . This report discusses the cooler performance and the measured electrical performance of the lead circuit that contains the copper leads and the superconducting leads. All of the HTS leads that were installed in magnet 2B were current tested using this apparatus.

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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

Cited by 9 publications

References 7 publications

Magnetic and Cryogenic Design of MICE Coupling Solenoid Magnet System

Magnetic and Cryogenic Design of MICE Coupling Solenoid Magnet System

Re-Condensation and Liquefaction of Helium and Hydrogen Using Coolers

Results from the Cooler and Lead Tests

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