Abstract
Fabrication of a thin superconducting solenoid1,2 for the Upgrade Tracking System3 for the DØ Detector4 at the Fermilab Proton-Antiproton Collider has begun. The 2.0 T magnet is 2.75 m long, 1.2 m in diameter and stores 5.6 MJ magnetic energy at full excitation. The magnet is novel in that no thin superconducting solenoid magnet for a particle detector has yet been fabricated which operates at this field level.
The magnet is to be installed in the existing DØ detector which has a thick magnetized steel muon absorber which surrounds the superconducting solenoid. In the event of an unexpected electrical short in the magnet is is desireable that the resulting asymmetric forces generated between the magnet and the muon steel not cause collateral damage to the detector.
Although the magnet is designed to sustain a quench without a protection resistor such a resistor is provided to extract a portion of the stored energy from the magnet during a quench to permit faster recool after the quench. This resistor cannot be used for routine discharging of the magnet as its use at full current would in fact cause a quench. To enable timely routine discharge it can be switched into the circuit at some lower current to speed the discharge without causing a quench. It is necessary to estimate the current at which the protection resistor can be used to safely speed discharge.
Work performed under US DOE Contract No. DE-AC02-76CH03000.
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References
B. Squires et al. Design of the 2 Tesla Superconducting Solenoid For the Fermilab DØ Detector Upgrade, Advances in Cryogenic Engineering 39:301, Plenum, New York (1993).
J. Brzezniak et al. Conceptual Design of a 2 Tesla Superconducting Solenoid for the Fermilab DØ Detector Upgrade, FERMILAB-TM-1886, Fermilab, Batavia (1994).
E823(DØ Upgrade) Magnetic Tracking, FERMILAB-DØ Upgrade E823, Fermilab, Batavia (1993).
S. Abachi, et al., The DØ Detector, Nuclear Instruments and Methods in Physics Research A338:185, (1994).
Private communications from various individuals cognizant of the magnet failure. The incident involved an electrical short from the inner layer of the conventional water cooled coils to ground via a plywood thermal shield that had become water soaked due to leaks from the coils. In this case collateral damage to detector elements followed since the coil package moved violently in response to the unanticipated decentering forces generated by the suddenly asymmetrized currents in the coils.
S. H. Kim, et al.,Effect of Electrical Shorts on Cryostatic Stable Superconducting Magnets, Advances in Cryogenic Engineering 23:214, Plenum, New York (1978).
L. R. Turner, Consequences of Shorted Turns in a Superconducting Magnet, Advances in Cryogenic Engineering 29:255, Plenum, New York (1984).
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© 1996 Plenum Press, New York
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Smith, R.P. et al. (1996). Electrical Safety of a Thin Superconducting Solenoid in an Iron Yoke. In: Kittel, P. (eds) Advances in Cryogenic Engineering. A Cryogenic Engineering Conference Publication, vol 41. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0373-2_239
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