DocumentCode :
1967624
Title :
The preservation of low emittance flat beams
Author :
Raubenheimer, T.O.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
fYear :
1993
fDate :
17-20 May 1993
Firstpage :
11
Abstract :
Many future linear collider designs require beams with very small transverse emittances and large emittance ratios εx≫εy. We discuss issues associated with the preservation of these small emittances during the acceleration of the beams. The primary sources of transverse emittance dilution in a high energy linear accelerator are the transverse wakefields, the dispersive errors, RF deflections, and betatron coupling. We discuss the estimation of these effects and the calculation of tolerances that will limit the emittance dilution with a high degree of confidence. Since the six-dimensional emittance is conserved and only the projected emittances are increased, these dilutions can be corrected if the beam has not filamented (phase mixed). We discuss methods of correcting the dilutions and easing the tolerances with beam-based alignment and steering techniques, and non-local trajectory bumps. Finally, we discuss another important source of luminosity degradation, namely, pulse-to-pulse jitter
Keywords :
beam handling techniques; electron accelerators; linear accelerators; particle beam diagnostics; RF deflections; beam-based alignment; betatron coupling; dispersive errors; emittance ratios; linear collider designs; low emittance flat beams; luminosity degradation; nonlocal trajectory bumps; pulse-to-pulse jitter; six-dimensional emittance; steering techniques; transverse emittance dilution; transverse emittances; transverse wakefields; Acceleration; Colliding beam accelerators; Colliding beam devices; Damping; Degradation; Dispersion; Jitter; Linear accelerators; Particle beams; Radio frequency;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
Type :
conf
DOI :
10.1109/PAC.1993.309033
Filename :
309033
Link To Document :
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