The TESLA Klystron and Modulator

by Stefan Choroba (DESY)

Thursday 18 May 2000, 16:00 → 16:30 Europe/Zurich

SL Auditorium (CERN)

The Tesla Linear Collider is a 500 to 800GeV centre of mass linear collider with included FEL facility. In order to achieve accelerating gradients up to 35MV/m at 1.3GHz in the superconducting cavities 1200 pulse klystrons and high voltage modulators are required. Each klystron has to generate an RF power up to 10MW at a pulse duration of 1.38ms and a repetition rate of 5Hz. For the FEL part of the linac 10Hz repetition rate is required. In order to achieve high power efficiency the multibeam klystron was chosen as RF power source. A prototype developed and built by Thomson TE was already tested at the manufacturers factory up to pulse duration of 0.5ms and a repetition rate of 30Hz. A test at full pulse width will start in May 2000 at DESY. High voltage modulators are required to pulse the klyston cathodes. The multibeam klystron needs rectangular high voltage pulses up to 117kV at currents up to 139A. The flat top pulse duration must be 1.4ms and the repetition rate 10Hz. Modulators based on the bouncer principle produce these pulses. Three modulators are in operation at the Tesla test facility at DESY. They supply 5MW single beam klystrons with pulses of similar voltage and current as for the multibeam klystron. Two of them can also be used for the operation together with 10MW multibeam klystrons. In this talk the parameters and the layout of the modulators and klystrons for the Tesla linear collider will be presented. It will be reported on the operation experience and future plans with the modulators and klystrons at the Tesla test facility at DESY. Test results will be shown.

Organiser(s): Werner Herr / SL Division

Note: Tea and coffee will be served at 15:30 in front of the Auditorium.

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