Observation of dark-current signals from the S-band structures of the SLAC linac

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It is well known that the electro-magnetic fields in high-gradient RF structures can cause electron emission from the metallic structure walls. If the emitted electrons are captured and accelerated by the accelerating fields so-called dark-current is induced. Dark-currents have been measured and studied for various RF-structures. In this paper the authors present measurements of RF induced signals for the SLC S-band structures. For nominal gradients of 17 MV/m it is shown that the dark-current can be strong enough to significantly reduce the signal-to-noise ratio of the SLC beam wire scanners. They also show results from RF measurements in the dipole ... continued below

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5 p.

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Assmann, R.; Decker, F.J.; Seidel, M.; Siemann, R.H. & Whittum, D. July 1, 1997.

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It is well known that the electro-magnetic fields in high-gradient RF structures can cause electron emission from the metallic structure walls. If the emitted electrons are captured and accelerated by the accelerating fields so-called dark-current is induced. Dark-currents have been measured and studied for various RF-structures. In this paper the authors present measurements of RF induced signals for the SLC S-band structures. For nominal gradients of 17 MV/m it is shown that the dark-current can be strong enough to significantly reduce the signal-to-noise ratio of the SLC beam wire scanners. They also show results from RF measurements in the dipole band. The measurements are compared to more direct observations of dark-current and it is tried to connect the results to possible effects on the accelerated particle beam.

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5 p.

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INIS; OSTI as DE97008414

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97008414
  • Report No.: SLAC-PUB--7579
  • Report No.: CONF-970503--207
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 521627
  • Archival Resource Key: ark:/67531/metadc694972

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 5, 2016, 7:05 p.m.

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Assmann, R.; Decker, F.J.; Seidel, M.; Siemann, R.H. & Whittum, D. Observation of dark-current signals from the S-band structures of the SLAC linac, article, July 1, 1997; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc694972/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.