The intense beams to be accelerated by SIS18 for FAIR will be affected by collective effects. Due to the low energy in SIS18 the beams will be particularly prone to space charge effects. Since the dynamics of such beams is not fully understood collective effects are subject to our investigation. Here we present transverse Schottky and beam transfer function (BTF) measurements that were performe...

Medical synchrotrons for radiation therapy require a very stable extraction of the beam over a period of about one second. The techniques for applying resonant extraction to achieve this long spill can be classified into two groups, those that move the resonance and those that move the beam. The latter has the great advantage of keeping all lattice functions, and hence the resonance conditions,...

The paper describes a new beam dynamics code for simulation of space charge effects in isochronous cyclotrons. The program assumes that the beam consists of many point macro-particles. The code uses a set of simplified equations of motion. It adopts continuous and slow acceleration approximation that allows one to separate betatron motion from slower energy-phase motion. Thus, the particle radi...

Beam position monitors are the primary diagnostic in the Proton Storage Ring (PSR) at Los Alamos National Laboratory (LANL). Injecting into a circular accelerator for one turn can be approximated transversely as single-­‐particle injection with initial betatron amplitude and angle, x0 and x0’ respectively, also known as the injection offset. The turn-­‐by-­‐turn beam position data of the single...

Although LEP was designed to allow both betatron and synchrotron injection, only betatron accumulation has been used up to now. During 1994 tests were made of injection in synchrotron phase space. Results are presented from these machine studies which show that for both 4 bunch and 8 bunch pretzel injection, this form of injection is a more efficient way of accumulating LEP beams. The use of sy...

Laser-plasma particle accelerators could provide more compact sources of high-energy radiation than conventional accelerators. Moreover, because they deliver radiation in femtosecond pulses, they could improve the time resolution of X-ray absorption techniques. Here we show that we can measure and control the polarization of ultra-short, broad-band keV photon pulses emitted from a laser-plasma-...

A two dimensional simulation study of the beam-beam interaction at SPEAR indicates that quantum fluctuations affecting the horizontal betatron oscillation play a critical role in the vertical beam blowup.

An optimal design of a low energy ~300 MeV! proton synchrotron for medical applications is addressed. The machine has the following properties: ~1! The transition energy is higher than the targets final proton beam energy of 300 MeV; ~2! the betatron tunes are chosen such that the machine is free of systematic resonances; ~3! the machine can accommodate both slow and fast extraction systems; an...

We have measured xy coupling of the interaction point(I.P.) at KEKB. When a normal mode is excited by a shaker with tune frequency, the horizontal or vertical betatron oscillations can be measured by a turn-by-turn BPM in the laboratory coordinate system. A harmonic analysis has been performed to extract the xy coupling parameters at I.P. from the detected betatron oscillations. 1 IDEA AND FORM...