Title :
Adiabatic invariance for spatially dependent accelerating structures
Author :
Cary, John R. ; Bruhwiler, David L.
Author_Institution :
Dept. of Astrophys., Planetary & Atmos. Sci., Colorado Univ., Boulder, CO, USA
Abstract :
The adiabatic dynamics of charged particles in accelerating structures is significantly altered if these structures vary in space rather than in time. Spatial variation occurs in, for example, free-electron lasers and radio-frequency quadrupoles. The adiabatic invariants for slow temporal and slow spatial variations differ. This causes the longitudinal emittance of adiabatically trapped beams to differ in the two cases. The number of particles trapped in each accelerating bucket also differs. Analytic and numerical results are presented to clarify these ideas.<>
Keywords :
particle beam diagnostics; accelerating bucket; adiabatic dynamics; adiabatic invariants; adiabatically trapped beams; charged particles; free-electron lasers; longitudinal emittance; radio-frequency quadrupoles; slow spatial variations; slow temporal variations; spatially dependent accelerating structures; Acceleration; Free electron lasers; Heating; Laser beams; Laser theory; Particle beams; Plasma accelerators; Plasma waves; Space charge; Tokamaks;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164732
