AC Losses in the MICE Channel Magnets -- Is This a Curse or aBlessing?

Green, Douglas R.; Wu, Hong; Wang, L.; Li, Kai; Jia, L. X.; Yang, S.Q.

doi:10.2172/928730

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…The behavior of the power supplies and their controllers was not fully understood. A rapid discharge varistor (diode) system was built to allow the spectrometer magnets to be discharged in the event of a power failure that would put the coolers out of commission [9], [10]. This would allow the magnet to be discharged fast enough to keep the HTS leads from burning out.…”

Section: The Results Of the Second Magnet Testmentioning

confidence: 99%

The Results of Tests of the MICE Spectrometer Solenoids

Virostek

Green

2010

IEEE Trans. Appl. Supercond.

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Abstract-The Muon Ionization Cooling Experiment (MICE) spectrometer solenoid magnets will be the first magnets to be installed within the MICE cooling channel. The spectrometer magnets are the largest magnets in both mass and surface area within the MICE cooling channel. Like all of the other magnets in MICE, the spectrometer solenoids are kept cold using 1.5 W (at 4.2 K) pulse tube coolers. The MICE spectrometer solenoid is quite possibly the largest magnet that has been cooled using small coolers. Two spectrometer magnets have been built and tested. This report discusses the results of current and cooler tests of both magnets.

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Section: The Results Of the Second Magnet Testmentioning

confidence: 99%

The Results of Tests of the MICE Spectrometer Solenoids

Virostek

Green

2010

IEEE Trans. Appl. Supercond.

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“…If the copper plate doesn't have enough mass to provide the cooling for the HTS leads, this cooling must be provided by boil-off gas from the magnet [17].…”

Section: Some Concluding Comments "What Was Learned From These Tests?"mentioning

confidence: 99%

“…The temperature drops in the copper plates that connect the tops of the HTS leads to the cooler first stage are very important, if one wants to maintain a large temperature margin for the HTS leads [17]. The temperature drop from the cold mass intercept points on the shield is also.…”

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 times needed for charge, discharge, and rapid discharge the magnet are 13950 s (~3.9 hours), 13790 s (~3.8 hours) and 5400 s (~1.5 hours) respectively [5] [6]. T * the worst case design based on p = 240 MeV/c and β= 420 mm The coupling coil is fabricated from standard MRI magnet conductor with a cooper to superconductor ratio of four.…”

Section: The Mice Coupling Magnet and Its Ac Lossesmentioning

confidence: 99%

Thermal Stability Analysis for Superconducting Coupling Coil in MICE

Wang²,

Green

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-The superconducting coupling coil to be used in the Muon Ionization Cooling Experiment (MICE) with inner radius of 750 mm, length of 285 mm and thickness of 110.4 mm will be cooled by a pair of 1.5 W at 4.2 K cryo-coolers. When the coupling coil is powered to 210 A, it will produce about 7.3 T peak magnetic field at the conductor and it will have a stored energy of 13 MJ. A key issue for safe operation of the coupling coil is the thermal stability of the coil during a charge and discharge. The magnet and its cooling system are designed for a rapid discharge where the magnet is to be discharged in 5400 seconds. The numerical simulation for the thermal stability of the MICE coupling coil has been done using ANSYS. The analysis results show that the superconducting coupling coil has a good stability and can be charged and discharged safely.

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AC Losses in the MICE Channel Magnets -- Is This a Curse or aBlessing?

Cited by 8 publications

References 11 publications

The Results of Tests of the MICE Spectrometer Solenoids

The Results of Tests of the MICE Spectrometer Solenoids

Results from the Cooler and Lead Tests

Thermal Stability Analysis for Superconducting Coupling Coil in MICE

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