Beam Test of Multi-Bunch Energy Compensation System in the Accelerator Test Facility at KEK

概要

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A beam test of the multi-bunch energy compensation system (ECS) was performed using the $\Delta F$ method with the $2856\pm 4.327$ MHz accelerating structures in the accelerator test facility (ATF) at KEK. The 1.54 GeV S-band linac of the ATF was designed to accelerate a multi-bunch beam that consists of 20 bunches with 2.8 ns spacing. The multi-bunch beam with $2.0\times 10^{10}$ electrons/bunch has an energy deviation of about 8.5% at the end of the linac due to transient beam loading without ECS. The ATF linac is the injector of the ATF damping ring (DR), whose energy acceptance is $\pm 0.5$%. The beam loading compensation system is necessary in the ATF linac for the successful injection of multi-bunch into DR. The rf system of the linac consists of 8 regular rf units with the SLED system and 2 ECS rf units without the SLED system. The accelerating structures of the regular units are driven at 2856 MHz and the 2 ECS structures are operated with slightly different rf frequencies of $2856\pm 4.327$ MHz. In the beam test, we have succeeded in compressing the multi-bunch energy spread within the energy acceptance of the DR using $\Delta F$ ECS. The principle of the beam loading compensation system of KEK-ATF and the experimental results are described in this paper.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-08-15