Ultrafast High-Voltage Kicker System for Ion-Clearing Gaps

Alexander Yu Smirnov,Adam Moro,Sergey V Kutsaev,Shukui Zhang,Ronald Agustsson,Haipeng Wang,Gunn Tae Park,Dmitry Gavryushkin,Alexei V Smirnov,Jiquan Guo,Stephen V Benson

doi:10.3390/photonics8110507

Abstract

Ionization scattering of electron beams with residual gas molecules causes ion trapping in electron rings, both in a collider and electron cooling system. These trapped ions may cause emittance growth, tune shift, halo formation, and coherent coupled bunch instabilities. In order to clear the ions and prevent them from accumulating turn after turn, the gaps in a temporal structure of the beam are typically used. Typically, the gap in the bunch train has a length of a few percent of the ring circumference. In those regions, the extraction electrodes with high pulsed voltages are introduced. In this paper, we present the design consideration and initial test results of the high-voltage pulsed kicker hardware that includes vacuum device and pulsed voltage driver, capable of achieving over 3 kV of deflecting voltage amplitude, rise and fall times of less than 10 ns, 100 ns flat-top duration at 1.4 MHz repetition rate.

Highlights

A polarized electron-ion collider (EIC) is a planned tool for gluon microscopy to explore the frontiers of quantum chromo-dynamics [1]
In order to deliver such high luminosities, a scheme to use multi-stage electron cooling of the ion beam has been developed by the Thomas Jefferson National Accelerator Facility (JLAB) [3]
In this approach the ion beam is first electron-cooled at low energy to reduce the emittance, and is accelerated to the collision energy where electron cooling is again continuously reapplied to maintain luminosity during collisions, by suppressing emittance degradation due to non-linear collective effects plus intra-beam and residual gas scattering processes

Summary

Introduction

A polarized electron-ion collider (EIC) is a planned tool for gluon microscopy to explore the frontiers of quantum chromo-dynamics [1]. In order to deliver such high luminosities, a scheme to use multi-stage electron cooling of the ion beam has been developed by the Thomas Jefferson National Accelerator Facility (JLAB) [3]. In this approach the ion beam is first electron-cooled at low energy to reduce the emittance, and is accelerated to the collision energy where electron cooling is again continuously reapplied to maintain luminosity during collisions, by suppressing emittance degradation due to non-linear collective effects plus intra-beam and residual gas scattering processes.

M7 MeVeV

High-1V506o0ltage Te1s1t0s75