Abstracts Brochure - CERN

THPCH147
THPCH148
THPCH149
29-Jun-06 16:00 - 18:00 THPCH — Poster Session
which must provide 25 kJ per pulse at very tight voltage regulation over the 1.5 millisecond pulse. DTI’s design uses a
quasi-resonant bouncer (with a small auxiliary power supply and switch) to maintain the voltage flattop, eliminating
the need for massive capacitor banks. The second design builds upon earlier DTI work for the 500 kV, 500 A NLC
modulators. It uses a solid-state Marx bank, with ∼10 kV stages, to drive the ILC klystron. Staggered turn-on of the
Marx stages provides voltage regulation without the need for large capacitor banks.
Solid-state HV Pulse Power in the 10 -100 Nanosecond Regime
M.A. Kempkes, F.O. Arntz, N. Butler, J.A. Casey, M.P.J. Gaudreau
(Diversified Technologies, Inc.)
430
New particle accelerators, with voltages exceeding
50 kV and currents exceeding 1,000
A, require kicker magnet drivers to deliver
pulsed power with durations in the 10 -100 ns
range. Similar levels of pulse performance are needed for state-of-the-art eximer laser systems, impulse radar transmitters,
and particle accelerators for medical therapy. In addition, the processing of food using pulsed electric fields
(PEF processing) has similar requirements. In this paper, DTI will review solid-state pulse power technologies capable
of delivering high-voltage, high-current pulses with 10-to-100 nanosecond pulse duration. IGBTs, MOSFETs,
snap-off diodes, and magnetic pulse compression will be discussed. Current research at Diversified Technologies, Inc.
is exploring the impact of these switching devices and circuits on pulse wave shape, pulse repeatability, adjustability
of pulse voltage, current and timing, maximum pulse rate (PRF), jitter, and robustness.
Tests of a High Voltage Pulser for ILC Damping Ring Kickers
M.A. Palmer, G. Dugan, D. L. Rubin (Cornell University, Laboratory
for Elementary-Particle Physics) R. Meller (Cornell University,
Department of Physics)
The baseline configuration for the International
Linear Collider (ILC) damping rings
specifies a single 6 km damping ring for
electrons and two 6 km rings for positrons.
Kicker requirements are determined by the
damping ring circumference and the train structure in the main linac. The nominal bunch train parameters in the
ILC main linac are trains of 2820 bunches with 308 ns spacing and a train repetition rate of 5 Hz. This means that the
pulsers for the damping ring kickers must have rise and fall times suitable for bunch spacings of ∼6 ns, must be able
to operate with 3.25 Mhz bursts, and must support an average pulse rate of 14.1 kHz. We describe bench and beam
tests of a pulser based on fast ionization dynistor technology whose specifications roughly meet these requirements.
We then discuss the implications of our results for the ILC damping ring kickers.
An Ultrafast Solidstate X-band RF Switch and its Application on Active Pulse Compression
In this paper, we present the recent results
J. Guo, S.G. Tantawi (SLAC)
of our research on the ultra-high power fast
silicon RF switch and its application on active
X-Band RF pulse compression systems. This switch is composed of a group of PIN diodes on a high purity silicon
wafer. The wafer is inserted into a cylindrical waveguide operating in the T·10 01 mode. Switching is performed by
injecting carriers into the bulk silicon through a high current pulse. Our current design uses a CMOS compatible
process and the fabrication is accomplished at SNF (Stanford Nanofabrication Facility). The RF energy is stored in