Forced Two-Phase Helium Cooling of Large Superconducting Magnets

Green, M. A.; Burns, William A.; Taylor, J. D.

doi:10.1007/978-1-4613-9856-1_51

Cited by 22 publications

(12 citation statements)

References 3 publications

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“…The MICE focusing magnets will be cooled using a 4.4 K refrigerator. Cooling the magnet using forced two-phase helium in tubes attached to the coil package makes sense as long as there is a refrigerator and control cryostat (with its heat exchanger) available to do the cooling [8]. The problem of using a pure tubular cooling system for the focusing magnet system is the initial 4.2 K testing of the magnet in a location that does not have a helium refrigeration system.…”

Section: Two Approaches For Building the Mice Focusing Coilsmentioning

confidence: 99%

Focusing Solenoids for the Mice Cooling Channel

Green

Baynham²,

Barr

et al. 2004

AIP Conference Proceedings

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This report describes a design for focusing solenoids for the low beta sections for the proposed Muon Ionization Cooling Experiment (MICE). There are three focusing solenoid pairs that will be around the muon absorbers for MICE. The two solenoid coils have an inside diameter of 510 mm, a length of 180 mm, and a thickness of 100 mm. A distance of 260 mm separates the two coils in the pair. The coils are designed to operate at opposite polarity, in order to create a gradient field in the low beta sections of the MICE cooling channel. As result, the force pushing the coil pair apart approaches 270 metric tons when the coils operate close to the short sample current for the superconductor. The forces between the coils will be carried by a support structure that is both on the inside and the outside the coils. During some modes of operation for MICE, the coils may operate at the same polarity, which means that the force between the coils pushes them together. The focusing magnet must be designed for both modes of operation. This support structure for the coils will be part of the focusing magnet quench protection system.

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Section: Two Approaches For Building the Mice Focusing Coilsmentioning

confidence: 99%

Focusing Solenoids for the Mice Cooling Channel

Green

Baynham²,

Barr

et al. 2004

AIP Conference Proceedings

Self Cite

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show abstract

“…This alternative is shown in Figure 18. The approach shown in Figure 18 is cooling the magnet using forced two-phase helium in tubes (there is very little liquid helium near the magnet) [29]. In this case liquid helium is stored in a separate storage cryostat.…”

Section: Cooling Connection To the Insertion Device From A Conventionmentioning

confidence: 99%

“…As the helium goes through the magnet it is warmed up and evaporated. The role of the storage dewar and heat exchanger is move the position of the two-phase helium flowing through the tubes in the magnet from the gas side of the two-phase dome to the liquid side of the two-phase dome [29] [30]. While force two phase cooling has been widely used for detector magnets, it has some disadvantages because the magnet typically runs about 0.1 K warmer than the helium in the control dewar.…”

Section: Cooling Connection To the Insertion Device From A Conventionmentioning

confidence: 99%

Cryogenic refrigeration requirements for superconducting insertion devices in a light source

Green¹

2003

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This report discusses cryogenic cooling superconducting insertion devices for modern light sources. The introductory part of the report discusses the difference between wiggler and undulators and how the bore temperature may affect the performance of the magnets. The steps one would take to reduce the gap between the cold magnet pole are discussed.One section of the report is devoted to showing how one would calculate the heat that enters the device. Source of heat include, heat entering through the vacuum chamber, heating due to stray electrons and synchrotron radiation, heating due to image current on the bore, heat flow by conduction and radiation, and heat transfer into the cryostat through the magnet leads.A section of the report is devoted to cooling options such as small cryo-cooler and larger conventional helium refrigerators. This section contains a discussion as to when it is appropriate to use small coolers that do not have J-T circuits. Candidate small cryo-coolers are discussed in this section of the report. Cooling circuits for cooling with a conventional refrigerator are also discussed.A section of the report is devoted to vibration isolation and how this may affect how the cooling is attached to the device. Vibration isolation using straps is compared to vibration isolation using helium heat pipes. The vibration isolation of a conventional refrigeration system is also discussed.Finally, the cool down of an insertion device is discussed. The device can either be cooled down using liquid cryogenic nitrogen and liquid helium or by using the cooler used to keep the devices cold over the long haul.

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“…This pump had a maximum pressure rating of 0. 4 MPa and it was used to cool down the PEP4 solenoid from 90 K to 4.4 K [2]. The PEP-4 pump was driven by an external variable speed drive.…”

Section: Positive Displacement Bellows Pumpmentioning

confidence: 99%

A superconducting linear motor drive for a positive displacement bellows pump for use in the g-2 cryogenics system

Green

1995

IEEE Trans. Appl. Supercond.

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Forced Two-Phase Helium Cooling of Large Superconducting Magnets

Cited by 22 publications

References 3 publications

Focusing Solenoids for the Mice Cooling Channel

Focusing Solenoids for the Mice Cooling Channel

Cryogenic refrigeration requirements for superconducting insertion devices in a light source

A superconducting linear motor drive for a positive displacement bellows pump for use in the g-2 cryogenics system

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