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A Closed-Cycle Refrigerator Based Pulsed Management System

Murthya, OVSN and Venkataraman, V (2009) A Closed-Cycle Refrigerator Based Pulsed Management System. In: International Journal of Modern Physics B, 23 (12-13). pp. 3024-3028.

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A low cost 12 T pulsed magnet system has been integrated with a closed-cycle helium refrigerator. The copper solenoid is directly immersed in liquid nitrogen for reduced electrical resistance and more efficient heat transfer. This ensures a minimal delay of few minutes between pulses. The sample is mounted on the cold finger of the refrigerator and, along with the surrounding vacuum shroud, is inserted into the bore of the solenoid. When combined with software lock-in signal processing to reduce noise, quick but accurate measurements can be performed at temperatures 4 K-300 K up to 12 T. Quantum Hall effect data in a p-channel SiGe/Si heterostructure has been used to calibrate the instrument against a commercial superconducting magnet. Its versatility as a routine characterization tool is demonstrated bymeasuring parallel conduction in Si/SiGe modulation doped heterostructures.

Item Type: Journal Article
Publication: International Journal of Modern Physics B
Publisher: World Scientific Publishing Company
Additional Information: Copyright of this article belongs to World Scientific Publishing Company.
Keywords: Pulsed magnet; closed cycle refrigerator; magnetotransport
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 14 Jul 2009 13:52
Last Modified: 19 Sep 2010 05:37
URI: http://eprints.iisc.ac.in/id/eprint/21339

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