| Paper |
Title |
Other Keywords |
Page |
| TUPMA005 |
Simulation Study on Bunch Lengthening
|
electron, storage-ring, damping, synchrotron |
106 |
| |
- Y. Sun, Z. Y. Guo
PKU/IHIP, Beijing
- J. Gao
IHEP Beijing, Beijing
| |
The bunch lengthening phenomenon is resulted from one of the most severe single bunch instabilities in electron storage rings. As for BEPCII, controlling the bunch length is the most critical task to fulfil the designed luminosity goal. A new code is developed to calculate the single bunch length and energy spread in storage rings using FORTRAN. In this code, the wake field is calculated using an analytical formula. The bunch length and energy spread under different bunch current are calculated for BEPCII. The tracking results clearly show that the microwave instability threshold is around 65 mA for BEPCII storage ring. The tracking results of this code are in good accordance with those from other codes.
|
|
|
|
| TUPMA067 |
New Timing System for the L-band Linear Accelerator at Osaka University
|
linac, laser, gun, electron |
208 |
| |
- S. Kashiwagi, G. Isoyama, R. Kato, S. Suemine
ISIR, Osaka
- T. Asaka, Y. Kawashima
JASRI/SPring-8, Hyogo-ken
| |
A highly precise and flexible timing system has been developed for the L-band linac at ISIR, Osaka University. It provides four RF signals and several timing signals for operation of the linac and for experiments with the linac. In order to realize long-term stability of the timing system and hence operation of the linac, a rubidium atomic clock producing a 10 MHz RF signal with the fractional stability of 10-15 is used as a time base for a synthesizer used as a master oscillator for generating the acceleration frequency of 1.3 GHz. The 1.3 GHz signal from the master oscillator is directly counted to produce the four RF signals and the clock signal of the timing system at 27 MHz. The master timing signals for linac operation is taken from the AC line frequency and it is synchronized with the 27MHz clock signal precisely. To make an arbitrary delayed timing signal, a standard digital delay generator is used to make a gate signal for a GaAs RF switch, with which one of the 27MHz clock pulses is sliced out to generate the delay timing signal. Any timing signal can be made in an interval of 37 ns and the timing jitter of the delayed signal is achieved to be as short as 2 ps.
|
|
|
|
| WEPMA024 |
A General Model of the Resistive Wall Instability in Linear Accelerators
|
focusing, coupling, vacuum, linear-collider |
363 |
| |
|
|
| WEPMA060 |
Measurements using the X-Ray and Optical Diagnostic Beamlines at the Australian Synchrotron
|
diagnostics, storage-ring, synchrotron, emittance |
407 |
| |
- G. LeBlanc, J. C. Bergstrom, M. J. Boland, R. T. Dowd, M. J. Spencer, Y. E. Tan
ASP, Clayton, Victoria
- D. J. Peake, R. P. Rassool
Melbourne, Melbourne
| |
First Light has been achieved on the diagnostic beamlines at the Australian Synchrotron 3 GeV storage ring. The X-ray Diagnostic Beamline (XDB) has been used to measured the beam size, divergence and emittance, while the Optical Diagnostic Beamline (ODB) has been used the measure the bunch length and turn-by-turn stability. Both beamlines receive dipole radiation from a bend magnet and provide continuous diagnostic data to the control room. The beamlines compliment each other with the ODB providing mainly longitudinal (temporal) information, while the XDB measures predominantly transverse (spatial) information. A brief description is given of the equipment on each beamline and the commissioning results are presented.
|
|
|
|