Abstract
Understanding the effects of RF breakdown in high-gradient accelerator structures on the accelerated beam is an extremely relevant aspect in the development of the Compact Linear Collider (CLIC) and is one of the main issues addressed at the Two-beam Test Stand at the CLIC Test Facility 3 at CERN. During a RF breakdown large electro-magnetic fields are generated and produce parasitic magnetic fields which interact with the accelerated beam affecting its orbit and energy. We discuss here measurements of such effects observed on an electron beam accelerated in a CLIC prototype structure. Measurements of the trajectory of bunch-trains on a nanosecond time-scale showed fast changes in correspondence of breakdown which we compare with measurements of the relative beam spots on a scintillating screen. We identify different breakdown scenarios for which we offer an explanation based also on measurements of the power at the input and output ports of the accelerator structure. Finally we present the distribution of the magnitude of the observed changes in the beam orbit and we discuss its correlation with RF power and breakdown location in the accelerator structure.
Highlights
Erratum: Effects of rf breakdown on the beam in the Compact Linear Collider prototype accelerator structure [Phys
In the list of parameters of the CLIC prototype accelerator structure given in Table II, the value of the input power should read 64 MW for a CLIC main linac nominal pulse consisting of 312 bunches, each one carrying a charge of 0.6 nC [1]
This corresponds to an accelerating gradient of 100 MV=m averaged over all cells, as in the unloaded case given in the same Table
Summary
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