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 (DRs) and DRs will produce, through synchrotron radiation, ultralow 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 generators for the DR kickers must provide extremely flat, high voltage, pulses. The specifications for the DR extraction kickers call for a 160- or 900-ns duration flat-top pulse of ±12.5 kV, with a combined ripple and droop of not more than ±0.02% (±2.5 V) for each pulse: an inductive adder is a very promising approach to meet the specifications. Recently, the first 20 layer, 12.5 kV, full-scale prototype inductive adder has been assembled at CERN and testing has commenced. This paper presents flat-top stability and repeatability measurements of the output waveforms of this full-scale prototype inductive adder for CLIC DR kicker systems. The pulse waveforms have been recorded with an oscilloscope which has nominally 16-bit resolution and allows measurements of minimum and maximum envelope curves for a large number of consecutive output waveforms. Both passive and active modulation methods have been applied to improve the relative flat-top stability of the prototype inductive adder to meet the specification of ±0.02%.
Highlights
T HE compact linear collider (CLIC) would be a highenergy electron–positron collider [1]
To achieve high luminosity at the interaction point, it is essential that the beams have very low transverse emittance: the pre-damping ring (PDR) and damping ring (DR) damp the beam emittance to extremely low values in all three planes
The prototype inductive adders have been equipped with an analog modulation layer, which can be used to compensate the droop and ripple of the output waveform
Summary
T HE compact linear collider (CLIC) would be a highenergy electron–positron collider [1]. It could provide very clean experimental environments and steady production of all particles within the accessible TeV energy range. Stripline kickers are required to inject beam into and extract beam from the PDRs and DRs [2]. In particular, the DR extraction kicker must have a very small magnitude of jitter: the 2-GHz RF specifications called for 12.5-kV pulses of 160-ns duration flat-top, with a combined ripple and droop of not more than ±0.02% [1]. The flat-top repeatability requirements are extremely tight, ±0.01%, for both RF system designs [1]
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