Title :
Study of a non-intrusive electron beam radius diagnostic
Author :
Kwan, Thomas J T ; DeVolder, Barbara G. ; Goldstein, John C. ; Snell, Charles M.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
Abstract :
We have evaluated the usefulness and limitation of a nonintrusive beam radius diagnostic which is based on the measurement of the magnetic moment of a high-current electron beam in an axisymmetric focusing magnetic field, and relates the beam root-mean-square (RMS) radius to the change in magnetic flux through a diamagnetic loop encircling the beam. An analytic formula that gives the RMS radius of the electron beam at a given axial position and a given time is derived and compared with results from a 2-D particle-in-cell code. Our study has established criteria for its validity and optimal applications
Keywords :
electron beam focusing; electron beams; high energy physics instrumentation computing; magnetic moments; particle beam diagnostics; 2D particle-in-cell code; analytic formula; axisymmetric focusing magnetic field; magnetic moment; nonintrusive electron beam radius diagnostic; Current measurement; Electron beams; Laboratories; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic flux; Magnetic moments; Particle beam measurements; Radiography;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751146
