Simulation of the Quenching of the Cyclotron Gas Stopper Magnet at MSU

Chouhan, S.; Green, M. A.; Zeller, A.

doi:10.1109/tasc.2014.2365538

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…The two coils shown in Fig. 4 are strongly coupled inductively, but Figure above shows the charging and discharging circuit for the LTS cyclotron gas-stopper magnet as built [16]. The HTS magnet has the same charging and discharging circuit as above.…”

Section: Power Supply and Quench Protection Systemmentioning

confidence: 99%

A Cyclotron Magnet Case Study: Would Replacing the LTS Coils With HTS Coils Make Sense?

Green

Chouhan

2016

IEEE Trans. Appl. Supercond.

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The cyclotron gas-stopper magnet (CGSM) at Michigan State University (MSU) was used as model for a study for whether HTS conductor is feasible for use in cyclotrons. The outside diameter of the CGSM split warm iron magnet yoke is 4 m, with a pole radius of 1.1 m. The desired field shape is obtained by shaping the iron pole profile. Each superconducting coil is in a separate cryostat. The two coils are connected in series through the warm electrical connection. Each coil is wound and potted within an 80 mm × 80 mm cross section and mounted within a 304 stainless steel helium vessel that is designed to carry magnetic forces to the magnet cold mass supports without excessive deflection. The iron is split, so that the cyclotron chamber and RF extraction system can be mounted between the two poles. This magnet has been successfully cooled down and tested at MSU to its 180-A operating current. One can ask the following question, "If one built a cyclotron magnet the size of the MSU cyclotron gas-stopper magnet, would replacing the existing LTS coils with HTS coils using a standard second generation HTS tape make technical sense or economic sense?" The report will explore the technical and economic issues of replacing an existing LTS coil with an HTS coil of the same size and shape, using 2G YBCO tape conductor commercially available in 2015 in place of the Nb-Ti used in the magnet.

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Section: Power Supply and Quench Protection Systemmentioning

confidence: 99%

A Cyclotron Magnet Case Study: Would Replacing the LTS Coils With HTS Coils Make Sense?

Green

Chouhan

2016

IEEE Trans. Appl. Supercond.

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“…An R7HC1612xx diode was added to the stack, because it appeared to be an ideal diode for the quench protection system for the MSU cyclotron gas stopper magnet [19]. This diode has a forward voltage at 4.2 K of over 10 V at 10 mA.…”

Section: Experimental Measurementsmentioning

confidence: 99%

Voltage Characteristics of Diodes Used for Passive Quench Protection of Low-Current Magnets

Chouhan

Green

Zeller

2015

IEEE Trans. Appl. Supercond.

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Cold diodes and resistors in parallel with the coils are keys components in the passive quench protection system of low-current (high inductance) superconducting magnets. The diodes prevent current from flowing in the circuits that are in parallel with sections of the superconducting coil when the magnet is being charged or discharged. The use of diodes and resistors in parallel with the superconducting coil sections reduce the peak voltages to ground and, in some cases, the hot-spot temperature in the magnet during a quench. This paper presents measurements of the onset (low current) forward voltage of several power diodes as a function of temperature and magnetic field.Index Terms-Cold power diodes, quench protection system, superconducting magnet, varistor discharge system. 1051-8223

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