| Paper |
Title |
Page |
| MOPCH151 |
Pulsed RF System for the ELBE Superconducting Accelerator
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411 |
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- A. Buechner, F.G. Gabriel
FZR/FWFE, Dresden
- H. Buettig, U. Lehnert, P. Michel, Ch. Schneider, R. Schurig
FZR, Dresden
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The RF system for the ELBE accelerator was originally designed for CW mode. Although this works problem-free tests have shown that it is possible to reach higher gradients in the TESLA cavities with a pulsed RF system. The new RF system will be presented together with measurements of the achievable gradients. Roughly 30% higher gradients could now be used in pulsed mode. As positive side effects the radiation by field emission is reduced by the duty cycle and an easy in situ RF conditioning of cavities and coupler windows is possible.
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| MOPCH152 |
A Pulsed-RF High-power Processing Effect of Superconducting Niobium Cavities observed at the ELBE Linear Accelerator
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413 |
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- U. Lehnert, H. Buettig, P. Michel, Ch. Schneider, R. Schurig
FZR, Dresden
- A. Buechner, F.G. Gabriel
FZR/FWFE, Dresden
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The driver LINAC of the ELBE radiation source is built for cw operation. However, in some cases a pulsed-mode operation was desired to extend the otherwise stringent gradient limits. The main restriction results from field emission that decreases the Q of the cavities which was evaluated from measurements of the liquid helium consumption. After pulsed-mode operation with gradients exceeding the maximum cw accelerating gradients by 30–40\% a significant reduction in the field emission was observed. This in turn allows higher accelerating gradients to be used in cw as well. We attribute this behaviour to an rf-processing of the cavity surface which burns off field emitters.
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