3Q120 Low Gradient Behaviour

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Three 3Q120 magnets--representative of those in the AP 1 line--have been measured with a harmonics probe at MDTF at both low (0-48 A) and high (to >= 400 A). The intent of the measurements was to learn their behavior at the low gradients necessary to transport 8 Gev antiprotons back through the AP 1 line for injection into the Main Ring (and subsequently the superconducting ring--see Ref. 1). Many of the measurements have been preceded by remnant field biasing ramps to 148, 270, 295, or 405 amps to set the remnant field to a standard value. The measurement sequence is ... continued below

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Wehmann, A. October 1, 1985.

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Description

Three 3Q120 magnets--representative of those in the AP 1 line--have been measured with a harmonics probe at MDTF at both low (0-48 A) and high (to >= 400 A). The intent of the measurements was to learn their behavior at the low gradients necessary to transport 8 Gev antiprotons back through the AP 1 line for injection into the Main Ring (and subsequently the superconducting ring--see Ref. 1). Many of the measurements have been preceded by remnant field biasing ramps to 148, 270, 295, or 405 amps to set the remnant field to a standard value. The measurement sequence is then 0,4,8,... 48 amperes (in 4 A steps). The amplitude vs current graph for 0-48 A is visually a straight line and can be fitted via linear regression to a straight line--obtaining a slope and intercept. The residual differences from a straight line can again be plotted vs current and can be reasonably well fit to a second degree polynomial. The smallest set of information that is necessary to tabulate for the operation of AP 1 quadrupoles is the set of currents that correspond to the desired focusing strengths as stipulated by the beam design. Given the parametrization described above, it is straightforward to extract a current corresponding to a given gradient strength for either of the two types of 3Q120.

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  • Report No.: FERMILAB-PBAR-NOTE-430
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/948911 | External Link
  • Office of Scientific & Technical Information Report Number: 948911
  • Archival Resource Key: ark:/67531/metadc933728

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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, 1985

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Dec. 2, 2016, 6:59 p.m.

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Wehmann, A. 3Q120 Low Gradient Behaviour, report, October 1, 1985; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc933728/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.