Damping spurious harmonic resonances in the APS storage ring beam chamber

Y. Kang, G. Decker, J. Song
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引用次数: 17

Abstract

The APS storage ring beam chamber has been storing the beam up to 100 mA successfully. However, in some beam chambers, spurious signals corrupted the BPM outputs. The cause of the unwanted signals was investigated, and it was found that transverse electric (TE) longitudinal harmonic resonances of the beam chamber were responsible. The beam chambers have small height in the area between the oval beam chamber and the antechamber. The structure behaves like a ridge waveguide so that the cut-off frequency of the waveguide mode becomes lower. The pass-band then includes the frequency around 350 MHz that is important to the beam position monitors (BPMs). The spurious harmonic resonances are damped with two types of dampers to restore the useful signals of the BPMs; coaxial loop dampers and lossy ceramic slab loading are used.
APS存储环波束室中杂散谐波的阻尼
APS存储环形束流室已经成功地存储了高达100毫安的束流。然而,在一些波束室中,杂散信号会破坏BPM输出。研究了不需要信号产生的原因,发现光束室的横向电(TE)纵向谐波共振是主要原因。在椭圆形梁室和前厅之间的区域,梁室的高度很小。该结构表现为脊状波导,使得波导模式的截止频率降低。然后,通频带包括350 MHz左右的频率,这对波束位置监视器(bpm)很重要。采用两种类型的阻尼器对假谐共振进行阻尼,以恢复bpm的有用信号;采用同轴回路阻尼器和有损陶瓷板加载。
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