Title :
Experimental and numerical studies of sheet electron beam propagation through a planar wiggler magnet
Author :
Zhang, Ze-Xiang ; Granatstein, Victor L. ; Destler, W.W. ; Bidwell, Steven W. ; Rodgers, J. ; Chang, Silvia ; Antonsen, T.M., Jr. ; Levush, B. ; Radack, D.J.
Author_Institution :
Maryland Univ., College Park, MD, USA
fDate :
12/1/1993 12:00:00 AM
Abstract :
Detailed experimental studies on sheet relativistic electron beam propagation through a long planar wiggler are reported and compared with numerical simulations. The planar wiggler has 56 periods with a period of 9.6 mm. Typically, the wiggler field peak amplitude is 5 kG. The experimental efforts are focused on controlling the deviation of the beam toward the side edge of the planar wiggler along the wide transverse direction. It is found that a suitably tapered magnetic field configuration at the wiggler entrance can considerably reduce the rate of deviation. The effects of the following techniques on beam transport efficiency are discussed: side focusing, beam transverse velocity tuning at the wiggler entrance, and beam spread limiting. High beam transport efficiency (almost 100%) of a 15-A beam is obtained in some cases
Keywords :
digital simulation; electron beams; particle beam diagnostics; relativistic electron beam tubes; wigglers; 100 percent; 15 A; 5 kG; 9.6 mm; beam spread limiting; beam transport efficiency; beam transverse velocity tuning; deviation; entrance; numerical simulations; periods; planar wiggler magnet; relativistic electron beam; sheet electron beam propagation; side focusing; tapered magnetic field configuration; transverse direction; wiggler field peak amplitude; Electron beams; Free electron lasers; Laser applications; Laser beams; Laser fusion; Laser stability; Laser tuning; Magnetic fields; Numerical simulation; Undulators;
Journal_Title :
Plasma Science, IEEE Transactions on
