Abstract
Beam injection and extraction in the delay loop of the CLIC Test Facility 3 (CTF3) for recombination of adjacent bunch trains, is performed by a specially designed rf deflector. A standing wave structure has been chosen for this purpose. Three possible solutions have been investigated, and a comparative analysis is presented. All of them satisfy the essential requirements of the system up to the maximum foreseen energy with the existing klystron. The final design of the rf deflector consists of two identical cavities connected to the rf power source through a hybrid junction that equally splits the power and isolates the klystron from reflections. The rf deflector design, the results of electromagnetic simulations, and the low level rf measurements are illustrated. The impact of beam loading in the rf deflectors on the transverse beam dynamics is also analyzed. The general expression of the single passage transverse wakefield is obtained and a dedicated tracking code has been written to study the multibunch multiturn effects. A complete analysis for different machine parameters and injection errors is presented and discussed. These numerical simulations indicate a tolerable beam emittance growth due to the transverse wakefield in the rf deflectors.
Highlights
CLIC Test Facility 3 (CTF3) [1] is the third test facility of the CLIC (Compact Linear Collider) project [2,3]
II E) and high power tests [5], which have confirmed the predictions of the electromagnetic simulations and the feasibility of such new scheme
To optimize the isolation of the klystron from the reflected power, all components connected to the two lower branches of the hybrid junction (HJ) must be as identical as possible, so that the impedance seen from those ports of the HJ is identical
Summary
CTF3 [1] is the third test facility of the CLIC (Compact Linear Collider) project [2,3]. The beam coming from the LINAC is an alternate sequence of socalled ‘‘even’’ and ‘‘odd’’ trains, which have a phase difference of 180 with respect to the 1.499 GHz of the RFD. This sequence of 140 ns long trains is realized by a prebunching system. Both the RFD design and the study of its interaction with the beam have been crucial points in the DL project.
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