Abstracts Brochure - CERN

WEPLS — Poster Session 28-Jun-06 16:00 - 18:00
The 3Hz Power Supplies of the SOLEIL Booster
SOLEIL is a 2.75 GeV new third generation
synchrotron radiation facility under con- P. Gros, S. Bobault, A. Loulergue (SOLEIL)
struction near Paris. The injector system is
composed of a 100 MeV electron Linac pre-accelerator followed by a full energy (2.75 GeV) booster synchrotron.
A repetition rate of 3Hz is required for the booster for the filling of the Storage Ring together with the need for
discontinuous operation for top-up filling mode. Based on digital regulation loop, the four power supplies (2 for the
dipoles 600 A x 1000 V and 2 for the quadrupoles 250 A x 450 V) reach the current tracking tolerance specification
of 10 -3 . The aim of this paper is to describe the main issues from the loads to the mains network through the power
converters that are essential to reach the required performances.
Power Supply Converters for the 10Hz ISIS Second Target Station Project (TS-2)
The Extract Proton Beamline to the ISIS second
target station will require magnets to be S.L. Birch, A. Morris (CCLRC/RAL/ISIS)
powered by ac/dc power converters. A total
of 50 magnets, quadrupole and dipole, require high stability dc current converters over a large dynamic range from
several kW to 600kW. There is also a requirement for two 10Hz pulsed magnets to extract the proton beam from the
present 50Hz target beamline, and hence specially designed power supplies are necessary. This paper describes the
selection process, types of topology considerations and final selections.
Reactive Power Compensation for the ISIS Main Magnet Power Supply
ISIS sited at the Rutherford Appleton Laboratory
(RAL) is the world’s most powerful M.C. Hughes, J.W. Gray, J. Ranner (CCLRC/RAL/ISIS)
pulsed neutron source. Intense pulses of
neutrons are produced at 50 Hz when a heavy metal target is bombarded with a beam of high energy (800MeV)
protons accelerated in a synchrotron. The magnets of the synchrotron are connected in a configuration known as a
"White Circuit"*, which consists of series connected magnets with parallel banks of capacitance forming a resonant
circuit tuned to 50 Hz. In order for the ISIS Main Magnet Power Supply to work efficiently it is important that this
resonant White Circuit remains in resonance at exactly 50 Hz. However it has been found that both the values of
capacitance and inductance are temperature dependent and hence vary over time. This introduces large reactive
power variations for the make-up power supply. Conventional methods of controlling power factor have proved
ineffective, resulting in unacceptable beam loss. This paper addresses the power factor issues faced by the ISIS White
Circuit, the solution currently in place, and the proposed introduction of Static VAr technology to further improve
the efficiency of the circuit.
*M. G. White et al. “A 3-BeV High Intensity Proton Synchrotron”, The Princeton-Pennsylvania Accelerator, CERN
Symp.1956 Proc., p525.
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