On Resonant Multi-Bunch Wakefield Effects in Linear Accelerators with Dipole Mode Detuning
نویسندگان
چکیده
منابع مشابه
Studies of Beam Induced Dipole-Mode Signals in Accelerating Structures at the SLC
Beam emittance dilution by self induced transverse elds (wake elds) in accelerating structures is a key problem in linear accelerators. To minimize the wake eld e ects the beam trajectory must be precisely centered within the structures. An e cient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. Th...
متن کاملDipole Mode Detuning in the Nlc Injector Linacs
A major consideration in the design of the accelerator structures in the injector linacs of the JLC/NLC[1] is to keep the wakefield effects within tolerances for both the nominal (2.8 ns) and alternate (1.4 ns) bunch spacings. One important multi-bunch wakefield effect is beam break-up (BBU), where a jitter in injection conditions of a bunch train is amplified in the linac; another is static em...
متن کاملMultibunch Motion with Nearest Neighbor Wakefield Coupling
This paper discusses various aspects of multibunch motion in thepresence of nearest neighbor wakefield coupling. Included are the solution to the problem for smooth focusing with equal bunch energies, an explanation for the apparent &mping of the bunch amplitudes that is observed for weak coupling, and a treatment of the problem for discrete focusing based on the moments of the wakefield distri...
متن کاملWakefield and Beam Centering Measurements of a Damped and Detuned X-band Accelerator Structure
We present wakefield measurements of a prototype Next Linear Collider (NLC) accelerator structure that was built with dipole mode damping and detuning to suppress the long-range transverse wakefield induced by a beam. In addition, we describe beam centering tests that use as a guide the dipole power coupled out of the structure for damping purposes.
متن کاملLong-Range Wakefields and Split-Tune Lattice at the SLC
At the SLC, a train consisting of one positron bunch fo l lowed by two electron bunches is accelerated in the linac, each separated by about 60 ns. Long-range transverse wakef ields from the leading bunch were found to cause up to a factor o f three increase in beam jitter for the trailing bunches. Incoming jitter is efficiently damped by BNS damping, but excitations in the middle of the linac ...
متن کامل