Abstract
The Compact Linear Collider (CLIC) study is exploring the scheme for an electron-positron collider with high luminosity and a nominal center-of-mass energy of 3 TeV. The CLIC predamping rings and damping rings (DRs) will produce, through synchrotron radiation, an ultralow emittance beam with high bunch charge. To avoid beam emittance increase, the DR kicker systems must provide extremely flat, high-voltage, pulses. The specifications for the extraction kickers of the DRs are particularly demanding: the flattops of the pulses must be ±12.5 kV with a combined ripple and droop of not more than ±0.02% (±2.5 V). An inductive adder is a very promising approach to meeting the specifications. Recently, a five-layer prototype has been built at CERN. Passive analog modulation has been applied to compensate the voltage droop, for example of the pulse capacitors. The output waveforms of the prototype inductive adder have been compared with predictions of the voltage droop and pulse shape. Conclusions are drawn concerning the design of the full-scale prototype inductive adder.
Highlights
H IGH-ENERGY electron–positron colliders, such as Compact Linear Collider CLIC [1], will be needed to investigate the TeV physics revealed by the LHC
To achieve high luminosity at the interaction point, it is essential that the beams have very low transverse emittance: the predamping rings (PDRs) and damping rings (DRs) damp the beam emittance to extremely low values in all three planes
The prototype adder has been tested with high voltage, up to 300 V per layer, and it has been equipped with an analog modulation layer, which can be used to compensate the droop of the output waveform
Summary
H IGH-ENERGY electron–positron colliders, such as Compact Linear Collider CLIC [1], will be needed to investigate the TeV physics revealed by the LHC. They would provide very clean experimental environments and steady production of all particles within the accessible energy range. Kickers are required to inject the beam into and extract beam from the PDRs and DRs. Jitter in the magnitude of the kick waveform causes beam jitter at the interaction point [2]. Date of publication April 1, 2014; date of current version October 21, 2014. The goals have been to find a suitable pulse power topology for the CLIC PDR and DR kicker systems, to make a proposal for possible means for achieving the required performance and, to design and to build a prototype pulse modulator and verify its operation
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