Operation of a Sunpower M87 Cryocooler in a Magnetic Field

Breon, Susan; Shirey, Kim; Banks, I. S.; Warner, Brent A.; Boyle, R.E; Mustafi, Shuvo

doi:10.1007/0-306-47919-2_99

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Using their model of the AMs-02 magnet, SCL generated values of the magnetic field along the three axes at 50 grid points specified for each cryocooler (see Figure 1). [2] Before embarking on testing at MIT, the magnetic field values given in AMs-02 coordinates were translated to values in a cryocooler-based coordinate system.…”

Section: Co-ordinate Transformation Of the Ams-02 Field To A Cryocoolmentioning

confidence: 99%

Qualifying the Sunpower M87N cryocooler for operation in the AMS-02 magnetic field

et al. 2004

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The Alpha Magnetic Spectrometer-02 (AMs-02) experiment uses a superfluid helium dewar to cool a large superconducting magnet. The outer vapor-cooled shields of the dewar are to be held at 80 K by four Sunpower M87N cryocoolers. These cryocoolers have magnetic components that might interact with the external applied field generated by the superconducting magnet, thereby degrading the cryocoolers' performance. Engineering models of the Sunpower M87 have been qualified for operation in a magnetic environment similar to the AMs-02 magnetic environment.Although there was no noticeable performance degradation at field levels that were comparable to AMs-02 field levels, there appears to be a small performance degradation at higher field levels. It was theorized that there were three possible issues related to these performance losses at high magnetic fields: i) induced piston rubbing on the cylinder wall due to forces and torques on the linear motor due to the applied magnetic fields; ii) Magnetic hysteretic and/or eddy current damping of the balancer due to its motion in the applied magnetic fields; iii) Inductance losses in motor due to the applied magnetic field.The experiments conducted at the Massachusetts Institute of Technology (MIT) cyclotron facility in June 2002 were designed to test these. Tests were performed over a range of field levels that were lower, comparable, and higher than the field levels that the cryocoolers will experience in the AMs-02 operating environment. This paper describes the experiments and the inferences derived from them.

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Section: Co-ordinate Transformation Of the Ams-02 Field To A Cryocoolmentioning

confidence: 99%

Qualifying the Sunpower M87N cryocooler for operation in the AMS-02 magnetic field

et al. 2004

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“…The coolers are qualified and tested by a team at NASA Goddard Space Flight Center, and are expected to remove a total of approximately 12 W at around 68 K. One of the initial concerns over the cryocoolers was whether their operation or performance would be compromised by the presence of the magnetic field. However, recent testing carried out by NASA [6] has demonstrated that the cryocoolers can be operated without problems or degradation in the stray field generated by the magnet.…”

Section: ) Cryocoolersmentioning

confidence: 99%

Cryogenic system for a large superconducting magnet in space

Harrison

Ettlinger

Kaiser³

et al. 2003

IEEE Trans. Appl. Supercond.

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The Alpha Magnetic Spectrometer (AMS) is a particle physics experiment for use on the International Space Station (ISS). At the heart of the detector will be a large superconducting magnet cooled to a temperature of 1.8 K by 2500 litres of superfluid helium. The magnet and cryogenic system are currently under construction by Space Cryomagnetics Ltd of Culham, England. This paper describes the cryogenic system for the magnet, designed for the unusual challenges of operating a superconducting system in space. Results from experiments demonstrating some of the new techniques and devices developed for the magnet cryogenics are also presented.

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“…The four coolers, each capable of 6 to 7 watts of heat lift at 77 K, will be run at reduced power to provide a total of 20-25 W of cooling on the shield at 77 K. The coolers, operating in the stray field of the magnet system, are being specially qualified for operation in a magnetic field of 750-1000 gauss. 31,32 Gifts. The Geosynchronous Imaging Fourier Transform Spectrometer (GIFTS) instrument is an advanced weather observing instrument originally scheduled to be launched on NASA's New Millennium Earth Observing 3 (EO3) spacecraft in 2005.…”

Section: Cryocooler Development For Future Nasa Missionsmentioning

confidence: 99%

Overview of NASA space cryocooler programs

Boyle¹,

Ross²

2002

AIP Conference Proceedings

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Mechanical cryocoolers represent a significant enabling technology for NASA's Earth and Space Science Enterprises. Many of NASA's space instruments require cryogenic refrigeration to improve dynamic range, extend wavelength coverage, or enable the use of advanced detectors to observe a wide range of phenomena-from crop dynamics to stellar birth. Reflecting the relative maturity of the technology at these temperatures, the largest utilization of coolers over the last fifteen years has been for instruments operating at medium to high cryogenic temperatures (55 to 150 ¶K). For the future, important new developments are focusing on the lower temperature range, from 6 to 20 ¶K, in support of studies of the origin of the Universe and the search for planets around distant stars. NASA's development of a 20 ¶K cryocooler for the European Planck spacecraft and a 6 ¶K cryocooler for the MIRI instrument on the James Webb Space Telescope (JWST) are examples of the thrust to provide low-temperature cooling for this class of future missions. COOLERS ON NEAR-TERM EARTH AND SPACE SCIENCE MISSIONSSince 1991, which included the launch of the Upper Atmospheric Research Satellite (UARS) with the Improved Stratospheric and Mesospheric Sounder (ISAMS) instrument, NASA's Earth and Space Science Program has launched 18 long-life cryocoolers into space, 12 of which are still operating on multi-year missions. 1 By the late 1990s, 5-year-life space cryocoolers built on the Oxford-cooler compressor concept of the original ISAMS instrument were considered flight proven, and many long-life space cryocoolers were developed using this compressor concept together with both Stirling and pulse tube expanders.Starting in December 1999, three large NASA Earth Observing System platforms (Terra, Aqua and Aura) were launched. Together, they included nine long-life cryocoolers in five separate Earthscience instruments. A final category of cryocoolers are those associated with observing space physics and planetary phenomena. These include gamma-ray and infrared instruments to examine the Universe and the surfaces of other planets. Table 1 summarizes the status of long-life cryocoolers used on NASA space science missions. These, together with other short-term NASA cooler flights over the past 15 years, are detailed in the following paragraphs.

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Operation of a Sunpower M87 Cryocooler in a Magnetic Field

Cited by 5 publications

References 6 publications

Qualifying the Sunpower M87N cryocooler for operation in the AMS-02 magnetic field

Qualifying the Sunpower M87N cryocooler for operation in the AMS-02 magnetic field

Cryogenic system for a large superconducting magnet in space

Overview of NASA space cryocooler programs

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