Pulser development for MBE-4

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The Multiple Beam Experiment MBE4 is designed to accelerate four cesium ion beams from 200 kV to about 1 MV using an induction linac and to demonstrate the process of current amplification simultaneously with acceleration. The injected beam is obtained from a source using a Marx generator providing typically 10 mA/beam with a length of 1.6 meters. This is equivalent to a beam duration time of about 3 ..mu..sec. Twenty four acceleration gaps in groups of four are distributed along the length of the machine which will be some 16 meters long when completed. Each group of four acceleration gaps ... continued below

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Pages: 9

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Gough, D.E. & Brodzik, D.A. June 1, 1986.

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The Multiple Beam Experiment MBE4 is designed to accelerate four cesium ion beams from 200 kV to about 1 MV using an induction linac and to demonstrate the process of current amplification simultaneously with acceleration. The injected beam is obtained from a source using a Marx generator providing typically 10 mA/beam with a length of 1.6 meters. This is equivalent to a beam duration time of about 3 ..mu..sec. Twenty four acceleration gaps in groups of four are distributed along the length of the machine which will be some 16 meters long when completed. Each group of four acceleration gaps with appropriate quadrupoles form one section of the machine, identified as A through F. Careful tailoring of the acceleration voltage waveforms at each gap is required to accelerate the beam, amplify the current and provide longitudinal focusing. Ideal voltage waveforms for each gap were generated for a gap voltage limit initially set at 30 kV. These waveforms are shown in Fig. 1. The waveforms for the first 4 gaps are triangular with an approximate width of 3 ..mu..sec, becoming flatter and shorter at subsequent gaps as the beam bunch velocity increases. Ninety two nickel-iron tape wound cores capable of 6.8 mVsec/core and twenty six silicon steel tape wound cores capable of 24 mVsec/core were available. Groups of cores at the first eight gaps have been used in conjunction with an appropriate number of pulsers to provide the necessary accelerating voltage waveforms together with the pulser waveforms at every fourth acceleration gap which provides the longitudinal focusing of the beam. This paper will deal with the performance of the pulsers for the first eight gaps of acceleration and expectations for the next four, currently under construction.

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Pages: 9

Notes

NTIS, PC A02/MF A01; 1.

Source

  • 17. power modulator symposium, Seattle, WA, USA, 23 Jun 1986

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  • Other: DE87003547
  • Report No.: LBL-21758
  • Report No.: CONF-860674-11
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 6968110
  • Archival Resource Key: ark:/67531/metadc1181258

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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.

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  • June 1, 1986

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Oct. 30, 2018, 12:23 p.m.

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Gough, D.E. & Brodzik, D.A. Pulser development for MBE-4, article, June 1, 1986; California. (https://digital.library.unt.edu/ark:/67531/metadc1181258/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.