Re: IGBT's, pulsed power (was Re: Waveguide TC)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "W.R. Langston by way of Terry Fritz <twftesla-at-qwest-dot-net>" <blangsto-at-iwvisp-dot-com>

"8000 (or so) 75 MW..." plus significant losses I presume; so, whose what 
is powering this set up?

Bill L.

Tesla list wrote:

>Original poster: "Greg Leyh by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><lod-at-pacbell-dot-net>
>
>
>>Original poster: "David Sharpe <sccr4us-at-erols-dot-com>
>>
>>[snip]
>>Stanford Linear Accelerator (SLAC) is one of the highest power
>>pulsed linear accelerators in this area, Greg Leyh may have some additional
>>comments concerning that system.  I'be been watching their ground breaking
>>work with IGBT's and pulsed power klystron drivers with great interest... and
>>hoping for several technical breakthroughs that can be utilized at our end
>>of the power spectrum.
>
>
>SLAC is engaged in the machine design of many subsystems
>for the Next Linear Collider, including the pulsed power
>modulators that will feed the 8000 or so 75MW x-band klystrons.
>
>Each of the 1000 or so modulator stations needs to generate a
>500kV, 2000A, 3uS pulse, at 120BPS.  Originally based on hydrogen
>thyratrons, the current modulator design now incorporates a
>novel 'fractional turn' transformer geometry driven by an array
>of 156 3300V, 2000A IGBT's.
>
>The IGBT's have been somewhat problematic, given that they are
>being operated in a very un-spec'd area of their parameter space.
>
>Here's a summary of the IGBT development that's been done to date:
>http://www-group.slac.stanford.edu/esd/default.htm
>
>IGBT's hold a great deal of promise for other pulsed power
>applications, as well.  They might be the right answer for
>medium-scale coils; it will depend largely on the requirements
>for dI/dt and the primary voltage.  For larger coils, where dI/dt
>is not an issue and where primary voltage and RMS current
>capability is critical, it appears that laser-triggered silicon
>might very well be the answer.
>
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