Drive beam stability studies and stabilization algorithms in CLIC Test Facility 3
Artikel i vetenskaplig tidskrift, 2013

In this paper the study of the mechanisms responsible for the time varying beam current losses in CTF3 (CLIC Test Facility 3), together with the feedbacks implemented to mitigate them, is presented. The study shows that the losses were linked mainly to the energy variation induced by the RF (Radio frequency) amplitude fluctuations. The RF-amplitude instability sources were identified. A feedback developed to mitigate this instability, acting on the RF-compression system by controlling the phase program of the klystron, is described in detail. The result is a significant improvement of the overall stability in the machine. The energy variation is reduced further with the use of an energy feedback operating on the RF-amplitude of the last klystron in the CTF3 linac. This feedback loop closes on the energy measured from a dispersive pickup after the linac. With the energy stabilized a beam current stability close to the CLIC (Compact Linear Collider) specification for a factor 4 combined beam was achieved.

CLIC Test Facility

Beam stability

RF-pulse compression



Tobias Persson

Chalmers, Teknisk fysik, Subatomär fysik

P.K. Skowroński

European Organization for Nuclear Research

R. Corsini

European Organization for Nuclear Research

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

0168-9002 (ISSN)

Vol. 735 152-156


Acceleratorfysik och instrumentering


Grundläggande vetenskaper