Abstracts Brochure - CERN

THPLS065
THPLS066
THPLS067
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
the impedance of beam ducts; (4) Quantity of flanges and bellows is significantly reduced. Configuration of the
pumps, results of the simulation for the pressure and thermal stress, and the criteria of the design will be discussed.
Optimization for Taiwan Photon Source Electron Beam Position Monitors through Numerical
Simulation
H.P. Hsueh, C.-H. Chang, G.-Y. Hsiung, C.-K. Kuan, T.-S. Ueng
(NSRRC) J.-R. Chen (NTHU)
466
One of the key steps toward successfully
building the newly proposed 3rd generation
synchrotron radiation research facility, Taiwan
Photon Source (TPS), is to optimize the
design of the high resolution electron beam position monitors through numerical simulation. With more advanced
electromagnetic simulation tool like MAFIA tailored specifically for particle accelerator, the design for the high resolution
electron beam position monitors can be tested in such environment before actually fabricated and physically
tested. The design goal of our high resolution electron beam position monitors is to achieve 0.1 micron resolution
if allowed by engineering limitations. The definition and differences of resolution and sensitivity of electron beam
position monitors will be discussed. The design consideration to achieve this 0.1 micron resolution goal will also be
discussed. The first design has been carried out and the correlated simulations were also carried out with MAFIA.
The results are presented and discussed here. Sensitivity as high as 200 has been achieved at 500 MHz. Further study
will also be described.
Improvement on the Single Bunch Operation of the TLS Injector
J.-Y. Hwang, C.-S. Fann, K.-T. Hsu, S.Y. Hsu, K.H. Hu, S.H. Lee,
K.-K. Lin, K.-B. Liu, Y.-C. Liu (NSRRC)
The improvement of the TLS (Taiwan Light
Source) injector on single bunch operation
is presented in this study. Limited by the
existing design of the TLS injector, the single
bunch operation was not optimized in terms of bunch purity for specific users of TLS. A high voltage pulser was
implemented to improve the situation. This pulser has been integrated into the high-voltage-deck electronics of
electron gun for single bunch generation. Both high-voltage pulses and the associated electron bunches are monitored
with a wideband digital oscilloscope. The result shows that the bunch purity can be greatly improved by using the
newly installed pulser. It also greatly eliminates the beam losses while injected into the booster ring.
Vertical Beam Size Control in TLS and TPS
C.-C. Kuo, H.-P. Chang, J.-R. Chen, P.J. Chou, K.-T. Hsu, G.-H. Luo,
H.-J. Tsai, D.-J. Wang, M.-H. Wang (NSRRC) A. Chao (SLAC) W.-T.
Weng (BNL)
Vertical beam size control is an important issue
in the light source operations. The horizontal-vertical
betatron coupling and vertical
dispersion were measured and corrected to
small values in the TLS 1.5 GeV storage ring.
Estimated beam sizes are compared with the measured values. By employing an effective transverse damping system,
the vertical beam blow-up due to transverse coherent instabilities such as the fast-ion beam instability was suppressed
and as a result, the light source is very stable. In NSRRC we are designing an ultra low emittance 3-GeV storage ring
and its designed vertical beam size could be as small as a few microns. The ground and mechanic vibration effects,
and coherent instabilities could spoil the expected photon brightness due to blow-up of the vertical beam size if not