Abstract
We discuss beam deceleration through a series of 12 power extraction and transfer structures, at the CLIC test facility 3 at CERN, as a proof-of-principle of the CLIC deceleration scheme. Up to 36% of the kinetic energy of an electron drive beam is extracted and converted to 12 GHz rf power. We look at the average and maximum energy loss of the particles, and compare them with simulations performed with the placet tracking code. The measured final energy is also compared to predictions based on the measured beam current and rf power in the structures. In the analysis we make use of the charge distribution form factor, taking into account the bunch length and the bunch phase. Finally, we look at the evolution of the transverse emittance with deceleration and compare the measured emittance with simulations.
Highlights
The proposed future eþe− collider CLIC [1] will use a two-beam scheme, in which an electron drive beam running in decelerators parallel to the main beam acts as a power source for accelerating the main beam to the final energy of 3 TeV
We demonstrate that all aspects of the CLIC drive beam deceleration and rf power production are well understood
We have studied beam deceleration through a line of 12 power extraction and transfer structures (PETS) structures
Summary
The proposed future eþe− collider CLIC [1] will use a two-beam scheme, in which an electron drive beam running in decelerators parallel to the main beam acts as a power source for accelerating the main beam to the final energy of 3 TeV. This allows a very high accelerating gradient for the main beam of 100 MV=m using normal conducting technology with a high efficiency. Energy is extracted from the drive beam using power extraction and transfer structures (PETS), which are passive, periodically loaded microwave structures with a preferred synchronous mode at ωrf=2π 1⁄4 12 GHz [1].
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