Present status of development of damping ring extraction kicker system for CLIC

TL;DR

This paper reviews the current development status of the damping ring extraction kicker system for CLIC, focusing on the design of high-precision pulse modulators and striplines to meet stringent specifications.

Contribution

It presents the initial design of the inductive adder modulator and the kicker system striplines for CLIC's damping rings.

Findings

Design of an inductive adder for high-voltage, flat pulses

Development of kicker striplines with high field homogeneity

Initial prototypes meet demanding specifications

Abstract

The CLIC damping rings will produce ultra-low emittance beam, with high bunch charge, necessary for the luminosity performance of the collider. To limit the beam emittance blow-up due to oscillations, the pulse power modulators for the damping ring kickers must provide extremely flat, high-voltage pulses: specifications call for a 160 ns duration and a flattop of 12.5 kV, 250 A, with a combined ripple and droop of not more than \pm0.02 %. The stripline design is also extremely challenging: the field for the damping ring kicker system must be homogenous to within \pm0.01 % over a 1 mm radius, and low beam coupling impedance is required. The solid-state modulator, the inductive adder, is a very promising approach to meeting the demanding specifications for the field pulse ripple and droop. This paper describes the initial design of the inductive adder and the striplines of the kicker system.