Developments and directions in 200 MHz very high power RF at LAMPF

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The Los Alamos Meson Physics Facility (LAMPF), is a linear particle accelerator a half-mile long. It produces an 800 million electron- volt hydrogen-ion beam at an average current of more than one milliamp. The first RF section of the accelerator consists of four Alvarez drift-tube structures. Each of these structures is excited by an amplifier module at a frequency of 201.25 MHz. These amplifiers operate at a duty of 13 percent or more and at peak pulsed power levels of about 2.5 million watts. The second RF accelerator section consists of forty-four side-coupled-cavity structures. Each of these is excited by ... continued below

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Pages: (33 p)

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Cliff, R.; Bush, E.D.; DeHaven, R.A.; Harris, H.W. & Parsons, M. January 1, 1991.

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The Los Alamos Meson Physics Facility (LAMPF), is a linear particle accelerator a half-mile long. It produces an 800 million electron- volt hydrogen-ion beam at an average current of more than one milliamp. The first RF section of the accelerator consists of four Alvarez drift-tube structures. Each of these structures is excited by an amplifier module at a frequency of 201.25 MHz. These amplifiers operate at a duty of 13 percent or more and at peak pulsed power levels of about 2.5 million watts. The second RF accelerator section consists of forty-four side-coupled-cavity structures. Each of these is excited by an amplifier module at a frequency of 805 MHz. These amplifiers operate at a duty of up to 12 percent and at peak pulsed power levels of about 1.2 million watts. The relatively high average beam current in the accelerator places a heavy demand upon components in the RF systems. The 201-MHz modules have always required a large share of maintenance efforts. In recent years, the four 201.25 MHz modules have been responsible for more than twice as much accelerator down-time as have the forty-four 805 MHz modules. This paper reviews recent, ongoing, and planned improvements in the 201-MHz systems. The Burle Industries 7835 super power triode is used in the final power amplifiers of each of the 201-MHz modules. This tube has been modified for operation at LAMPF by the addition of Penning ion vacuum pumps.'' This has enabled more effective tube conditioning and restarting. A calorimetry system of high accuracy is in development to monitor tube plate-power dissipation.

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Pages: (33 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • RF Expo 91, Orlando, FL (United States), 29 Oct 1991

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  • Other: DE92000175
  • Report No.: LA-UR-91-3102
  • Report No.: CONF-9110221--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5333626
  • Archival Resource Key: ark:/67531/metadc1063568

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  • January 1, 1991

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 21, 2018, 3:48 p.m.

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Cliff, R.; Bush, E.D.; DeHaven, R.A.; Harris, H.W. & Parsons, M. Developments and directions in 200 MHz very high power RF at LAMPF, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1063568/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.