Cold Test Measurements on the GTF Prototype RF Gun
Author(s) -
S.M. Gierman
Publication year - 2010
Language(s) - English
Resource type - Reports
DOI - 10.2172/993721
Subject(s) - electron gun , spectrum analyzer , calibration , radio frequency , optics , rf power amplifier , power (physics) , injector , field emission gun , brightness , physics , materials science , nuclear engineering , electrical engineering , electron , optoelectronics , engineering , cathode ray , nuclear physics , diffraction , amplifier , cmos , quantum mechanics , thermodynamics
The SSRL Gun Test Facility (GTF) was built to develop a high brightness electron injector for the LCLS and has been operational since 1996. Based on longitudinal phase space measurements showing a correlated energy spread the gun was removed and re-characterized in 2002. The low power RF measurements performed on the gun are described below. Perturbative bead measurements were performed to determine the field ratio in the two-cell gun, and network analyzer measurements were made to characterize the mode structure. A second probe was installed to monitor the RF field in the first cell, and a diagnostic was developed to monitor the high-power field ratio. Calibration of the RF probes, a model for analyzing RF measurements, and Superfish simulations of bead and RF measurements are described.
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