Title :
Radio frequency measurements and analysis codes
Author :
Billen, James H.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
This paper describes a comprehensive set of computer codes for measuring, analyzing, and displaying field distributions in RF cavities. Development work began in 1984 for 8086-based computers. The codes now run on 486 and 386 PCs and include extensive on-line documentation. BEADPULL and QUADPULL collect frequency shifts as a metal or dielectric bead traverses a resonant cavity at constant speed. QUADPULL measures fields in all four quadrants of radiofrequency quadrupole (RFQ) cavities. Analysis codes apply the Slater perturbation theory to convert frequency shifts to fields. BEADPLOT plots the field distributions and calculates field integrals. DTLPLOT analyzes and plots BEADPULL measurements in drift-tube or coupled-cavity linacs. QUADPLOT does the same for QUADPULL data in RFQs. Supporting programs prepare design data for comparison with the measurements and compute averages of multiple measurements. COUPLING extends the accuracy of an impedance analyzer for Q and VSWR measurements. The code plots reflection coefficients on a Smith chart and analyzes the resonance circle to get β
Keywords :
beam handling equipment; cavity resonators; linear accelerators; physics computing; 386 PCs; 486 PCs; 8086-based computers; BEADPULL frequency shifts; COUPLING; DTLPLOT; Q measurements; QUADPULL frequency shifts; RF cavities; Slater perturbation theory; Smith chart; VSWR measurements; analysis codes; computer codes; coupled-cavity linacs; drift-tube linacs; field distributions; field integrals; frequency shifts; impedance analyzer; radio frequency measurements; reflection coefficients; Computer displays; Dielectric measurements; Distributed computing; Documentation; Frequency conversion; Frequency measurement; Linear accelerators; Personal communication networks; Radio frequency; Resonance;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308772
