Microwave Instability across the Transition Energy
نویسندگان
چکیده
منابع مشابه
Measurement of the effect of transition energy changes on microwave instability thresholds
The longitudinal emittance budget for the LHC beams in the SPS is very tight, 0:4 eVs at injection and 0:7 eVs at extraction. One possible cause of emittance growth comes at injection into the SPS from the microwave instability, a single bunch effect whereby the machine impedance renders the high intensity LHC bunches unstable. One way of raising the threshold of this instability is to increase...
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. Longitudinal stability of a bunch is studied above the threshold of microwave instability using a moment expansion approach. We derive a system of nonlinear equations describing bunch dynamics and study it in computer simulations. Contributed to ICFA Workshop, Nonlinear and Collective Phenomena in Beam Physics, Arcidosso, Italy September 2-September 6, 1996 *Work supported by ~epartment of En...
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Stability of the Haissinski solution is studied above the threshold of microwave instability. It is shown that instability may lead to a new self-consistent state corresponding to particles trapped in a separat rix of an unstable mode. The free energies of the two solutions are compared. The relaxation oscillations between the new and Haissinski solutions are possible and may be related to the ...
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Tracking simulations, with the aim of studying the microwave regime with short and intense bunches, suggest different instability mechanisms, according to the impedance model. In order to get a better insight of the source of the instability, i.e. azimuthal or radial mode coupling, we chose to follow the Vlasov-Sacherer approach to investigate the stability of the stationnary solution. The gene...
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Using a streak camera, we measured the longitudinal profiles of a positron bunch in the Low Energy Ring (LER) of KEKB at various currents. The measured charge densities were used to construct a simple Q=1 broadband impedance model. The model, with three parameters, not only gave an excellent description of longitudinal dynamics for positive momentum compaction factor but also for the negative o...
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ژورنال
عنوان ژورنال: IEEE Transactions on Nuclear Science
سال: 1985
ISSN: 0018-9499,1558-1578
DOI: 10.1109/tns.1985.4333900