The longitudinal phase space distribution of the SLC beams is affected by many different machine parameters and constraints. By using a technique of over-compression [1] in the ring to linac transfer line, a small energy spread of 0.12 % can be achieved at the end of the linac for a bunch length of 1.2 mm (σ). In the final focus a small energy spread is desirable to reduce emittance dilution du...

The problem of bunch lengthening in electron storage rings has been treated by many people, and there have been many experiments. In the typical experiment, the theory is used to determine the impedance of the ring. What has been lacking thus far, however, is a calculation of bunch lengthening that uses a carefully calculated ring impedance (or wakefield). In this paper we begin by finding the ...

Existing theories of coherent synchrotron radiation (CSR) are related to the motion of an electron bunch on a circular orbit and do not describe the case of nite magnet length. In this paper we present the CSR theory for a bunch of any length moving in an arc of a nite angle. The radiative interaction of the electrons in the bunch is analyzed for a line charge distribution using ultrarelativist...

1 Abstract Interaction of external monochromatic, linearly polorized plane EM-wave with nonlinear one-dimensional wake wave, generated by relativistic electron bunch moving in cold plasma, is considered. At definite conditions on parameters of plasma and bunch, nonlinear wake wave can have a pronounced spikes, where plasma electron density has its maximum value and plasma electron velocities ar...

_~ Figure 1: Conceptual diagram of bunch-by-bunch feedback. The phase-of each bunch is detected and a feedback signal particular to that bunch is produced by the filter and is applied via the kicker. _~ The phase is.. dejected, filtered, and the feedback correction signal is applied by the kicker. Since we are damping energy oscillations using measurements of phase, the required feedback signal...

Theoretical examination is made of single bunch collective effects in the collider ring of a 2 Tev 2 Tev Mu-Mu Collider complex. The situation involves an intense bunch, a short bunch, a small momentum compaction, a rather large impedance for the rf system, and luminosity life time limited by muon decay to of the order a thousand turns. The use in rings of techniques such as BNS damping, develo...

At the light source BESSY II new digital bunch-bybunch feedback systems [1] have been put into operation in January 2013, replacing the existing analog as well as the obsolete digital systems. From the first days of operation the new system successfully suppresses transverse and longitudinal beam instabilities in wide range of machine parameters. The system offers also many new diagnostics oppo...

Weak vertical coupled bunch instability with oscillation amplitude at μm level has been observed in SPEAR3. The instability becomes stronger when there is a vacuum pressure rise by partially turning off vacuum pumps and it becomes weaker when the vertical beam emittance is increased by turning off the skew quadrupole magnets. These confirmed that the instability was driven by ions in the vacuum...

We briefly describe the physics goals of the AWAKE experiment proposed at CERN. AWAKE is a plasma wakefield acceleration (PWFA) experiment using the SPS proton bunch as a PWFA driver. These goals include the study of the self-modulation instability of the proton bunch propagating along the plasma, the sampling of the accelerating wakefields by witness electrons, the acceleration of an electron ...