Abstracts Brochure - CERN

WEPLS — Poster Session 28-Jun-06 16:00 - 18:00
The Dynamic Response of the Parallel Resonant Circuit with the Different Power Excitation
In order to avoid drawing a large reactive
power from the a.c. lines, the "White Circuit" X. Qi, X. Xu, J. Zhang (IHEP Beijing)
type resonant network was adopted widely
as the structure of the magnet power supply system of the rapid cycle synchrotron. Reducing the higher harmonics
of the magnet current in the parallel resonant network is the key technique for the magnet current tracking accuracy.
Based on the dynamic response analysis of a single mesh parallel resonant circuit in this paper, it shows that the
continuous power excitation is of great benefit to reducing the magnet current harmonics. This paper also gives a
description of our experimental studies on the dynamic response with the pulse and continuous power excitation in
a parallel resonant network model.
Programmable Power Supply for Distribution Magnet for 20-MeV PEFP Proton Linac
The distribution magnet is powered by bipolar
switching-mode converter that is em- S.-H. Jeong, J. Choi, H.-S. Kang, K.-H. Park (PAL)
ployed IGBT module and has controlled by
a DSP (Digital Signal Process). This power supply is operated at ?350A, 5 Hz programmable stair output for beam
distribution to 5 beamlines of 20-MeV PEFP proton linac. Various applications for the different power supply are
made simple by software. This paper describes the design and test results of the power supply.
New Magnet Power Supply for PAL Linac
Since the completion of PLS in 1994, PLS
Linac magnet power supply(MPS) has been
operated for 12 years with 12-bit resolution
and 0.1% stability. Improvement in the reso-
S.-C. Kim, J. Choi, K.M. Ha, J.Y. Huang, J.H. Kim, S.H. Kim, I.S. Ko,
S.S. Park (PAL)
lution and the reliability of the Linac MPS is highly required now for the stable beam injection and 4th generation light
source research. To improve MPS, we developed new compact MPS of 16-bit resolution and 20ppm stability using
four-quadrant switching scheme with 50kHz MOSFET switching device. Bipolar MPS for corrector magnet consists
of main power board, control power board, regulator board and CPU board. Size of each board is only 100mm width
and 240mm depth. Unipolar MPS for quadrupoles and solenoid magnets is composed by parallel-operation of two
main power boards, doubling the current output. Output of MPS is 10V, ±10A for the bipolar and 50V, 50A for the
unipolar magnet. In this paper, we report on the development and characteristics of the new MPS for PAL linac.
Stability Study of Superconductor Magnet Power Supplies at TLS
In this paper, performance of three power
supplies schemes driving the newly-devel- Y.-C. Chien, K.-T. Hsu, C.-S. Hwang, C.-Y. Liu, K.-B. Liu (NSRRC)
oped Superconducting Wave Length Shifter
Magnet at TLS is investigated. Due to the inherent structure of the Superconducting Magnet, the main and two accessory
trimming power supplies are physically correlated with each others. Due to the inherent structure, in order to
achieve high performance control of the magnet, slew rate control of the main power supply and the proper operation
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