Modulator considerations for the SNS RF system

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The Spallation Neutron Source (SNS) is an intense neutron source for neutron scattering experiments. The project is in the research stage, with construction funding beginning next year. The SNS is comprised of an ion source, a 1,000 MeV, H{sup {minus}} linear accelerator, an accumulator ring, a neutron producing target, and experimental area to utilize the scattering of the neutrons. The linear accelerator is RF driven, and the peak beam current is 27 mA and the beam duty factor is 5.84%. The peak RF power required is 104 MW, and the H{sup {minus}} beam pulse length is 0.97 ms at a ... continued below

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4 p.

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Tallerico, P.J. & Reass, W.A. December 31, 1998.

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The Spallation Neutron Source (SNS) is an intense neutron source for neutron scattering experiments. The project is in the research stage, with construction funding beginning next year. The SNS is comprised of an ion source, a 1,000 MeV, H{sup {minus}} linear accelerator, an accumulator ring, a neutron producing target, and experimental area to utilize the scattering of the neutrons. The linear accelerator is RF driven, and the peak beam current is 27 mA and the beam duty factor is 5.84%. The peak RF power required is 104 MW, and the H{sup {minus}} beam pulse length is 0.97 ms at a 60 Hz repetition rate. The RF pulses must be about 0.1 ms longer than the beam pulses, due to the Q of the accelerating cavities, and the time required to establish control of the cavity fields. The modulators for the klystrons in this accelerator are discussed in this paper. The SNS is designed to be expandable, so the beam power can be doubled or even quadrupled in the future. One of the double-power options is to double the beam pulse length and duty factor. The authors are specifying the klystrons to operate in this twice-duty-factor mode, and the modulator also should be expandable to 2 ms pulses at 60 Hz. Due to the long pulse length and low RF frequency of 805 MHz, the klystron power is specified at 2.5 MW peak, and the RF system will have 56 klystrons at 805 MHz, and three 1.25 MW peak power klystrons at 402.5 MHz for the low energy portion of the accelerator. The low frequency modulators are conventional floating-deck modulation anode control systems.

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4 p.

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INIS; OSTI as DE99001662

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  • 23. international power modulator symposium, Rancho Mirage, CA (United States), 22 Jun 1998

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  • Other: DE99001662
  • Report No.: LA-UR--98-2751
  • Report No.: CONF-980665--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 307948
  • Archival Resource Key: ark:/67531/metadc688714

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 5, 2016, 7:38 p.m.

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Tallerico, P.J. & Reass, W.A. Modulator considerations for the SNS RF system, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc688714/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.