Magnetic field of the 30-inch hydrogen bubble chamber at NAL: report on results of fringe-field measurements and central-field measurements

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During the period from December 19, 1972 to January 7, 1973 an extensive program of measurements of the fringe field of the 30-inch HBC magnet at NAL was carried out. Measurements of two components of the field were made at approximately 1900 points in the fringe field down-stream from the bubble chamber at each of two magnet currents (nominal currents were 18,000 and 16,000 amps). An additional 800 measurements were made to determine the effects on the field of iron phototube shields used with a dE/dx counter installed in the downstream magnet slot as part of experiment 2B. Measurements were ... continued below

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60 pages

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Shephard, W.D.; Bishop, J.M.; Fokitis, E. & U., /Notre Dame July 1, 1973.

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During the period from December 19, 1972 to January 7, 1973 an extensive program of measurements of the fringe field of the 30-inch HBC magnet at NAL was carried out. Measurements of two components of the field were made at approximately 1900 points in the fringe field down-stream from the bubble chamber at each of two magnet currents (nominal currents were 18,000 and 16,000 amps). An additional 800 measurements were made to determine the effects on the field of iron phototube shields used with a dE/dx counter installed in the downstream magnet slot as part of experiment 2B. Measurements were also made at about 180 points in the fringe field upstream from the bubble chamber in the region traversed by incident beams of particles. In addition about 200 measurements were made in the visible volume of the chamber to check the calibration of the field, the accuracy of existing field maps, and the variation of the central field with magnet current. This report describes the equipment used in the acquisition of the data and provides estimates of the precision with which the measurements of field and of position could be made. The reduction of the raw data to a form useful for obtaining fits to the fringe field is discussed. Simple plots of the fringe field in regions traversed by beam and secondary particles are provided and a polynomial approximation for the fringe field is discussed. This may be used as an approximation in estimating the effects of the fringe field on secondary particles from interactions in the chamber. Plots are also provided which allow an estimation of the bending of incident particles prior to entering the chamber. They also discuss studies made at Notre Dame on the variation of the central field with magnet current and on the applicability of currently available parameterizations of the field in the visible volume of the chamber. The raw measurements have been transcribed onto magnetic tape. Transformations of the raw data to yield corrected field components and coordinates in either beam-line-based or magnet-based coordinate systems are discussed in detail. If detailed knowledge of the field measurements is needed at this time transcriptions of the data tape can be provided by either the University of Notre Dame or the University of Toronto. A modified polynomial subroutine for the magnetic field in the visible region of the chamber which fits the measurements and includes the observed scaling of the field with magnet current is available from Notre Dame. The preliminary polynomial parameterization of the fringe field described in Section III.E. may be used as an approximation to the upstream and downstream fringe fields.

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60 pages

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  • Report No.: FERMILAB-PUB-73-108-E
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 892466
  • Archival Resource Key: ark:/67531/metadc874237

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  • July 1, 1973

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 4:48 p.m.

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Shephard, W.D.; Bishop, J.M.; Fokitis, E. & U., /Notre Dame. Magnetic field of the 30-inch hydrogen bubble chamber at NAL: report on results of fringe-field measurements and central-field measurements, article, July 1, 1973; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc874237/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.