Abstract
The CLIC Test Facility 3 (CTF3) is being built and commissioned by an international collaboration to test the feasibility of the proposed Compact Linear Collider (CLIC) drive beam generation scheme. Central to this scheme is the use of RF deflectors to inject bunches into a delay loop and a combiner ring, in order to transform the initial bunch frequency of 1.5 GHz from the linac to a final bunch frequency of 12 GHz. To do so, the machine's transverse optics must be tuned to ensure beam isochronicity and each ring's length can finally be adjusted with wiggler magnets to a sub millimeter path length accuracy. Diagnostics based on optical streak camera and RF power measurements, in particular frequency bands, have been designed to measure the longitudinal behaviour of the beam during the combination. This paper presents the diagnostics and recent commissioning measurements.
Highlights
The CLIC Test Facility 3 (CTF3) is being built and commissioned by an international collaboration to test the feasibility of the proposed Compact Linear Collider (CLIC) drive beam generation scheme
To optimise the bunch combination scheme, optical diagnostics based on a streak camera and RF diagnostics based on frequency dependent power measurements using the phase monitor have been developed
These diagnostics are located in and after the delay loop and in the combiner ring, see figure 2, in order to monitor the beam during the combination process
Summary
To optimise the bunch combination scheme, optical diagnostics based on a streak camera and RF diagnostics based on frequency dependent power measurements using the phase monitor have been developed. These diagnostics are located in and after the delay loop and in the combiner ring, see figure 2, in order to monitor the beam during the combination process. The streak camera provides a phase measurement within a 200 ps - 10 ns time window of the beam pulse train, while the phase monitor provides a time resolved measurement along the 1.2 μs pulse train, with a 10.4 ns time resolution, limited by the sampling rate of the ADC In addition to these two diagnostics for bunch frequency monitoring, two other diagnostics were needed for normalisation purposes. The errors due to the calibration factor measured for the streak camera and goodness of the fit of the streak profile, using the function in equation (2.1), were taken into account in the bunch length and bunch spacing analysis and corresponding error estimation
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