Estimate of the longitudinal and transverse impedances for the superconducting super collider

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We try to estimate the longitudinal impedance per harmonic Z/sub L//n as well as the transverse impedance Z/sub T/ for the 20 TeV Superconducting Super Collider (SSC). Effects due to space charge, wall resistivity, bellows, monitor plates, synchrotron radiation are considered. The resulting Z/sub L//n and Z/sub T/ are plotted. Such a knowledge of Z/sub L//n and Z/sub T/ is necessary in computing the limits of many types of instabilities for the bunched beam. To be more specific, in our estimation, we consider the special case of an injection energy of 1 TeV and assume a maximum field of 5 ... continued below

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Pages: 6

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Ng, K.Y. January 1, 1984.

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Description

We try to estimate the longitudinal impedance per harmonic Z/sub L//n as well as the transverse impedance Z/sub T/ for the 20 TeV Superconducting Super Collider (SSC). Effects due to space charge, wall resistivity, bellows, monitor plates, synchrotron radiation are considered. The resulting Z/sub L//n and Z/sub T/ are plotted. Such a knowledge of Z/sub L//n and Z/sub T/ is necessary in computing the limits of many types of instabilities for the bunched beam. To be more specific, in our estimation, we consider the special case of an injection energy of 1 TeV and assume a maximum field of 5 Tesla in the SSC dipoles. In some cases, we also assume a 60/sup 0/ FODO cell structure consisting of 4 dipoles and 2 quadrupoles each with 2 long straight sections. The beampipe radius and beam radius are chosen as b = 1.0 in. and a = 0.05 cm respectively. Totally, the storage ring consists of 364 cells and has a mean radius of R = 17.38 km. Our results show that when monitor plates matched at both ends (such as the ones used in the Tevatron) are used, their effects dominate both Z/sub L//n and Z/sub T. 7 references, 5 figures.

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Pages: 6

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NTIS, PC A02; 3.

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  • Other Information: Paper copy only, copy does not permit microfiche production

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  • Other: DE84009404
  • Report No.: FERMILAB/TM-1239
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/5246684 | External Link
  • Office of Scientific & Technical Information Report Number: 5246684
  • Archival Resource Key: ark:/67531/metadc1069451

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  • January 1, 1984

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 9, 2018, 4:23 p.m.

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Ng, K.Y. Estimate of the longitudinal and transverse impedances for the superconducting super collider, report, January 1, 1984; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1069451/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.