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SLAC-PUB-14420
THE ILC P2 MARX AND APPLICATION OF THE MARX TOPOLOGY TO
FUTURE ACCELERATORS*
M.A. Kemp#, A. Benwell, C. Burkhart, J. Hugyik, R. Larsen, K. Macken, D. MacNair, M. Nguyen,
J. Olsen, SLAC National Accelerator Laboratory, Menlo Park, CA, USAAbstract
The SLAC P2 Marx is under development as the linac
klystron modulator for the ILC. This modulator builds
upon the success of the P1 Marx, which is currently
undergoing lifetime evaluation. While the SLAC P2
Marx's (henceforth, "P2 Marx") target application is the
ILC, characteristics of the Marx topology make it equally
well-suited for operation at different parameter ranges; for
example, increased pulse repetition frequency, increased
output current, longer pulse width, etc. Marx parameters
such as the number of cells, cell capacitance, and
component selection can be optimized for the application.
This paper provides an overview of the P2 Marx
development. In addition, the scalability of the Marx
topology to other long-pulse parameter ranges is
discussed.
SLAC LONG-PULSE MARX TOPOLOGY
SLAC Topology
Stated simply, the Marx topology charges energy
storage elements in parallel, and discharges them in
series. The output voltage is N*Vcarge where N is the
number of cells. The circuit diagram of the P2 Marx cell
is shown in Fig. 1. The design and operation of this cell is
more completely detailed elsewhere [1-3]. There are
many different variants to the Marx topology, several of
which have been adopted to drive a klystron load. Each
topology has advantages and disadvantages [4, 5].
In the P2 Marx, all switching is accomplished by solid--4kV -1kV
Out Out875 NF
4kV -1kV
in Instate devices. To simplify control and protection, the
Marx cell voltage is derived from the blocking voltage of
presently available IGBT dies. In addition, the modulator
is built with N+2 redundancy. Up to two of the thirty-two
cells can fail and the modulator can still provide the full
specified output. Regulation is achieved at the cell level;
each cell provides a square output pulse. Specifications
for the modulator are shown in Table 1.
There are several features of the P2 Marx topology.
There is no large output transformer in the modulator.
This increasingly is a cost savings as pulse lengths
increase. There is active correction of the output. A flat
pulse is easily achieved for different impedance loads.
The modulator is oil-free, inherently modular in
implementation, and is single-sided accessible. This aids
in serviceability. There is significant real-time diagnostic
access to the transient waveforms within the cells. This
enables quick diagnosis of problems and prognostication
of future required maintenance.
Table 1: ILC Klystron Modulator Specifications
Output Voltage 120 kV
Output Current 140 A
Pulse Width 1.6 ms
Pulse Repetition Frequency 5 Hz
Voltage Flat-top +1- 0.5%Cell
Out
01 - Q2
50pHQ3
04
VCC1
350 uiF'1
TfCell
InFigure 1: Simplified cell schematic.
*Work supported by the US Department of Energy under contract
DEAC02- 76SF00515.
"mkemp(slac.stanford.eduFigure 2: Single cell test results. (brown) output
voltage, (blue) PWM current, (green) output current.4
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Kemp, M. A.; Benwell, A.; Burkhart, C.; Hugyik, J.; Larsen, R.; Macken, K. et al. The ILC P2 Marx and Application of the Marx Topology to Future Accelerators, article, August 19, 2011; United States. (https://digital.library.unt.edu/ark:/67531/metadc837759/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.