Abstract

The linear accelerator (linac) in the Advanced Light Source (ALS) is designed to provide either single or multiple bunches of 50 MeV electrons for the booster synchrotron. The design and operation of the low power RF system for the ALS linac are presented. Three cavities are used in the linac for electron bunching. The two subharmonic bunching cavities operate at 124.914 MHz and 499.654 MHz, respectively. The S-band buncher operates at 2.997924 GHz. The low level RF system includes a master signal source, RF burst generators, signal phase control, timing trigger generators and a water temperature control system. >

Highlights

  • The Linear Accelerator (Linac)in the Advanced LightSource (ALS) is designed to provide either single or multiple bunehers of 50 MeV electrons for the booster synchrotron

  • The electron gun serves as the source of die electrons

  • Nine signal distribution amplifiers each producing 1 Ware of up to 19 micro electron bunches or a single macroelectron used to distribute the master oscillator signal to wherever it is bunch is initiated by pulsing the cathode or gating the grid of die needed

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Summary

INTRODUCTION

The electron bunches exiting the gun converts the master signal to 124.914 MHz for the first. It is important to keep the phase relationship between the RF signal and the electron bunch(cs) at a proper constant for maxi­ mum bunching effect Besides the manual or ILC adjustable phase shifters, provision for a phase servo loop has been set up to minimize the phase change from pulse to pulse. At the moment when all signal phases have stabilized within the 1.5 \iS S-Band RF burst, a sample of the phase error is taken, digitized and converted to a dc error voltage of the opposite sign. Output of the phase error signal and input for Uic phase correction to and from the ILC have been provided for possible future computer control of die phase loop

TIMING OPERATION OF THE SYSTEM
A Gun prc-rrigger signal from die Tuning Sysicm is present
CONCLUSIONS

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