Design and construction of the photocathode electron gun cavity

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A 1300-MHz, two-cell rf accelerator cavity has been constructed for the high-brightness photocathode electron source program. Each cell has an rf drive. Cell one has a replacement photocathode plug on the back wall and has a shape designed for linear radial fields. Cell two has a more standard high-shunt-impedance shape. SUPERFISH values for shunt impedances are, respectively, 29.5 and 45.8 M/Omega//m. Peak surface field maximums are 58.9 and 32.1 MV/m for an electron acceleration of 0.9 and 1.0 MeV. Drive coupling is matched for 55 and 86% beam loading at 1-A average current. The system has vacuum pumping ports, into ... continued below

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Pages: 4

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Gray, E.R. & Fraser, J.S. January 1, 1988.

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Description

A 1300-MHz, two-cell rf accelerator cavity has been constructed for the high-brightness photocathode electron source program. Each cell has an rf drive. Cell one has a replacement photocathode plug on the back wall and has a shape designed for linear radial fields. Cell two has a more standard high-shunt-impedance shape. SUPERFISH values for shunt impedances are, respectively, 29.5 and 45.8 M/Omega//m. Peak surface field maximums are 58.9 and 32.1 MV/m for an electron acceleration of 0.9 and 1.0 MeV. Drive coupling is matched for 55 and 86% beam loading at 1-A average current. The system has vacuum pumping ports, into both cells and is baked at 300/degree/C. Typical operating pressures are in low 10/sup /minus/10//-torr range. Cell frequencies are fine tuned by a combination of operating temperature and cell nose pulling. Cell-to-cell coupling was intended to be low (K = 0.0002); however, because of the high Qs (13,300 and 20,000), substantial coupling effects are seen. Cutting the vacuum-port slots shifted the frequencies by 1.5 MHz and gave an apparent 10% increase in the cavity Qs. Construction of the cavity required a series of four brazes with several annealing cycles. All joints are flat, and the sequence is such that each joint is brazed horizontally; as a result, all joints were successfully brazed on the first attempt. The latest experiment measurements are given in another paper at this conference. 2 refs., 3 figs.

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Pages: 4

Notes

NTIS, PC A02/MF A01; 1.

Source

  • Linear accelerator conference, Williamsburg, VA, USA, 3 Oct 1988

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  • Other: DE89000339
  • Report No.: LA-UR-88-3258
  • Report No.: CONF-881049-18
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6867320
  • Archival Resource Key: ark:/67531/metadc1191026

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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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  • January 1, 1988

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Sept. 17, 2018, 12:02 p.m.

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Gray, E.R. & Fraser, J.S. Design and construction of the photocathode electron gun cavity, article, January 1, 1988; United States. (digital.library.unt.edu/ark:/67531/metadc1191026/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.