频率偏移系统,将射频功率馈送到加速腔,保持场均匀性。

IF 1.7 4区 工程技术 Q3 INSTRUMENTS & INSTRUMENTATION
Takashi Ohshima, Naoyasu Hosoda, Eito Iwai, Kota Ueshima, Shunya Takahashi, Takato Tomai, Takao Asaka, Nobuyuki Nishimori, Takahiro Inagaki
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引用次数: 0

摘要

我们开发了一种新的系统,将射频功率馈送到高阶谐振模式(HOM)阻尼腔中,同时保持场均匀性。HOMs阻尼的TM020腔在加速模式磁场的节点处具有槽以吸收HOMs。为了保持HOMs的阻尼性能,铁氧体吸收器的温度应保持较低。但是,如果TM020场分布的均匀性被破坏,则TM020模式的部分功率会泄漏到槽中,使吸收器受热,从而降低了HOMs的吸收能力。因此,保持磁场均匀性是非常重要的。然而,频率调谐器在启动过程中与腔共振的运动可能会引起场变形。避免这种情况的一种解决方案是制造腔尺寸,使调谐器的插入在标称射频馈电功率下很小。在这种情况下,由于腔体温度较低,冷启动时的谐振频率高于设计值。作为对策,我们在低电平射频系统中增加了一个功能,以在启动时将馈送到腔中的射频信号的频率移位。该系统由一个数模转换器(DAC)和一个同相正交调制器组成,并结合运行在DAC模块的现场可编程门阵列上的专用固件。该系统已在日本同步辐射设施NanoTerasu中引入,并按预期工作。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Frequency offset system to feed RF power to accelerating cavity with keeping field uniformity.

We developed a novel system to feed RF power to a higher-order resonant mode (HOM)-damped cavity while maintaining field uniformity. An HOM-damped TM020 cavity has slots located at the node of the magnetic field of the accelerating mode to absorb the HOMs. The temperature of the ferrite absorbers should be kept low to maintain the damping performance of the HOMs. However, if the uniformity of the TM020 field distribution is broken, part of the power of the TM020 mode leaks into the slots, heats the absorbers, and degrades the absorbing capability of the HOMs. Therefore, it is important to maintain the field uniformity. However, the movement of the frequency tuner to resonate with the cavity during startup may cause field deformation. One solution to avoid this situation is to fabricate cavity dimensions such that the insertion of the tuner is small under the nominal RF feeding power. In this case, the resonant frequency at the cold start was higher than the designed value owing to the low cavity temperature. As a countermeasure, we added a function to the low-level RF system to shift the frequency of the RF signal fed to the cavity during startup. The system consists of a digital-to-analog converter (DAC) and an in-phase and quadrature modulator combined with dedicated firmware running on the field-programable gate array of the DAC module. This system was introduced in NanoTerasu, a Japanese synchrotron radiation facility, and has worked as expected.

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来源期刊
Review of Scientific Instruments
Review of Scientific Instruments 工程技术-物理:应用
CiteScore
3.00
自引率
12.50%
发文量
758
审稿时长
2.6 months
期刊介绍: Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.
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