Single-side electron multipacting at the photocathode in rf guns

Clicks: 277
ID: 99842
2008
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Abstract
Multiple electron impacting (multipacting) can take place in rf fields when the rf components are composed of materials with a secondary electron yield greater than one. In rf gun cavities, multipacting may change the properties of the vacuum components or even damage them. First systematic measurements of the multipacting occurring in a photocathode rf gun were made at the Fermilab/NICADD Photoinjector Laboratory in 2000. The multipacting properties were found to depend on the cathode material and the solenoid field configuration. In this study, we measure the multipacting properties in more detail and model the secondary electron generation for numerical simulation. Measurements and simulations for the photoinjectors at Fermilab and DESY are compared. The multipacting takes place at the photocathode in rf guns and is categorized as single-side multipacting. In a low rf field, the electrons emitted from the cathode area do not leave the gun cavity within one rf cycle and have an opportunity to travel back and hit the cathode. The solenoid field distribution in the vicinity of the cathode changes the probability of electron bombardment of the cathode and makes a major contribution to the multipacting behavior.
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han2008singlesidephysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Han, Jang-Hui;Flöttmann, Klaus;Hartung, Walter;
Journal physical review special topics accelerators and beams
Year 2008
DOI
DOI not found
URL
http://doi.org/10.1103/PhysRevSTAB.11.013501
Keywords
Biology (General) Science physics education (general) mathematics nuclear and particle physics. atomic energy. radioactivity astrophysics

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