D0 - Chimeny Lead Quench Detection, Beta Solenoid

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The voltage drop across the superconducting chimney lead is sensed to detect a quench. The return sense lead is mounted outside the chimney. The return sense lead and the superconducting chimney wire form a loop with area A {approx} 1.7 m{sup 2} (information from R. Ru. cinski). Changing flux through area A will induce a voltage in the sense loop and could cause false quench detection. Assume that the field through A changes 1 kGauss (0.1 Wb/m{sup 2}) in 10{sup -3} sec. The induced voltage is then: e = d0/dt = dBA/dt and e = 0.1 x 1.7/10{sup -3} = ... continued below

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21 pages

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Visser, A. T. October 1, 1993.

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Description

The voltage drop across the superconducting chimney lead is sensed to detect a quench. The return sense lead is mounted outside the chimney. The return sense lead and the superconducting chimney wire form a loop with area A {approx} 1.7 m{sup 2} (information from R. Ru. cinski). Changing flux through area A will induce a voltage in the sense loop and could cause false quench detection. Assume that the field through A changes 1 kGauss (0.1 Wb/m{sup 2}) in 10{sup -3} sec. The induced voltage is then: e = d0/dt = dBA/dt and e = 0.1 x 1.7/10{sup -3} = 170 V. This is probably a very pessimistic estimate, but it shows that we have to watch out. Changes of 100 Gauss in 100 msec (CDF experience?) are probably more likely and cause: e = 0.01 x 1.7/10{sup -2} {approx} 1.7 V noise. This noise is still too high because trip levels are planned to sit at {approx}50 mV? It is practically impossible to predict what the real noise values would be, but I expect them to be in the order of 1 to 10 V. This is more than we can handle and I would expect nuisance trips.

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21 pages

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  • Report No.: FERMILAB-D0-EN-373
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/1032134 | External Link
  • Office of Scientific & Technical Information Report Number: 1032134
  • Archival Resource Key: ark:/67531/metadc832740

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1993

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

Description Last Updated

  • Aug. 30, 2016, 4:02 p.m.

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Visser, A. T. D0 - Chimeny Lead Quench Detection, Beta Solenoid, report, October 1, 1993; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc832740/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.