Abstract
The proposed Compact Linear Collider (CLIC) uses a high intensity, low energy drive beam to produce the RF power needed to accelerate a lower intensity main beam with 100 MV/m gradient. This scheme puts stringent requirements on drive beam stability in terms of phase, energy and current. The consequent experimental work was carried out in CLIC Test Facility CTF3. In this paper, we present a novel analysis technique in accelerator physics to find beam drifts and their sources in the vast amount of the continuously gathered signals. The instability sources are identified and adequately mitigated either by hardware improvements or by implementation and commissioning of various feedbacks, mostly beam-based. The resulting drive beam stability is of 0.2°@ 3 GHz in phase, 0.08% in relative beam energy and about 0.2% beam current. Finally, we propose a stabilisation concept for CLIC to guarantee the main beam stability.
Highlights
The compact linear collider (CLIC) [1] is a proposed particle accelerator, which will possibly take over from Large Hadron Collider (LHC) at the high energy physics frontier after its planned shut down around 2035
CLIC Test Facility CTF3 [2] is a test facility, which aims to demonstrate the feasibility of CLIC technology by generation of the high current drive beam used for two-beam acceleration and to develop a variety of different CLIC specific equipment
The main beam has been accelerated by the factor 8 combined drivebeam-generated RF power from the energy of 199 MeV to 242 MeV
Summary
The compact linear collider (CLIC) [1] is a proposed particle accelerator, which will possibly take over from Large Hadron Collider (LHC) at the high energy physics frontier after its planned shut down around 2035. The two-beam acceleration concept imposes strict requirements on the drive beam stability, in terms of current, energy and phase. The CLIC drive beam stability goals (phase translated to CTF3 machine independent of RFfrequency) are following [3]:. Only the locations with a beam presence are shown This allows for quick identification of the origin of a drift, or at least its approximate location, by pointing out the most upstream signal that is diverging. The signal and its time evolution can be verified in detail using the ReferenceMonitor This makes these applications crucial for stabilisation of the machine since operators can more quickly identify a problem, determine the origin and react appropriately
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