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Results of using permanent magnets to suppress Josephson noise in the KAPPa SIS receiver

Wheeler, Caleb H. and Neric, Marko and Groppi, Christopher E. and Underhill, Matthew and Mani, Hamdi and Weinreb, Sander and Russell, Damon S. and Kooi, Jacob W. and Lichtenberger, Arthur W. and Walker, Christopher K. and Kulesa, Craig (2016) Results of using permanent magnets to suppress Josephson noise in the KAPPa SIS receiver. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII. Proceedings of SPIE. No.9914. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 99141W. ISBN 9781510602076. https://resolver.caltech.edu/CaltechAUTHORS:20180614-161844333

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Abstract

We present the results from the magnetic field generation within the Kilopixel Array Pathfinder Project (KAPPa) instrument. The KAPPa instrument is a terahertz heterodyne receiver using a Superconducting-Insulating- Superconducting (SIS) mixers. To improve performance, SIS mixers require a magnetic field to suppress Josephson noise. The KAPPa test receiver can house a tunable electromagnet used to optimize the applied magnetic field. The receiver is also capable of accommodating a permanent magnet that applies a fixed field. Our permanent magnet design uses off-the-shelf neodymium permanent magnets and then reshapes the magnetic field using machined steel concentrators. These concentrators allow the use of an unmachined permanent magnet in the back of the detector block while two small posts provide the required magnetic field across the SIS junction in the detector cavity. The KAPPa test receiver is uniquely suited to compare the permanent magnet and electromagnet receiver performance. The current work includes our design of a ‘U’ shaped permanent magnet, the testing and calibration procedure for the permanent magnet, and the overall results of the performance comparison between the electromagnet and the permanent magnet counterpart.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2231358DOIArticle
ORCID:
AuthorORCID
Kooi, Jacob W.0000-0002-6610-0384
Additional Information:© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
Subject Keywords:SIS junction, Heterodyne, KAPPa, Array Receivers, THz
Series Name:Proceedings of SPIE
Issue or Number:9914
Record Number:CaltechAUTHORS:20180614-161844333
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180614-161844333
Official Citation:Caleb H. Wheeler, Marko Neric, Christopher E. Groppi, Matthew Underhill, Hamdi Mani, Sander Weinreb, Damon S. Russell, Jacob W. Kooi, Arthur W. Lichtenberger, Christopher K. Walker, Craig Kulesa, "Results of using permanent magnets to suppress Josephson noise in the KAPPa SIS receiver", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99141W (20 July 2016); doi: 10.1117/12.2231358; https://doi.org/10.1117/12.2231358
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87141
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:15 Jun 2018 15:00
Last Modified:03 Oct 2019 19:52

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