论文标题
模拟腔模拟器支持LLRF开发
Analog Cavity Emulators to Support LLRF Development
论文作者
论文摘要
LLRF系统的目的是控制带有光束的实际射频腔。尽管数字模拟有一个位置，但要有一个模拟电路来为腔体站立，这对于验证正在开发的硬件+固件+软件非常有帮助。已经与SLAC和LBNL合作开发了广泛的空腔模拟器。腔模拟器通常基于石英晶体和频率转换硬件。晶体频率和耦合机制的选择部分取决于其旨在模拟的腔体的带宽和耦合。带宽范围的示例从800 Hz（SLAC）作为SRF腔的备用范围，到31 kHz（LBNL）的室温蓄能环腔。外部LO用于调整模拟腔频率。如果范围包括模拟反向功率波形，则耦合属性也很感兴趣。 LLRF系统检查诸如闭环带宽以及确定腔功能失调的方法可以交互作用，也可以作为连续集成（CI）过程的一部分进行。本文描述了腔模拟器的设计，实现和性能。
The goal of a LLRF system is to control an actual RF cavity with beam. While digital simulations have a place, having an analog circuit to stand in for the cavity can be tremendously helpful in validating hardware+firmware+software under development. A wide range of cavity emulators have been developed in collaboration with SLAC, and LBNL. Cavity emulators are typically based on quartz crystals and frequency conversion hardware. The choice of crystal frequency and coupling mechanism depends in part on the bandwidth and coupling of the cavity it's intended to emulate. Examples of bandwidth range from 800 Hz (SLAC) as a stand-in for a SRF cavity, to 31 kHz (LBNL) for a room-temperature accumulator ring cavity. An external LO is used to tune the emulated cavity frequency. The coupling properties are also of interest if the scope includes emulating reverse power waveforms. LLRF system checks such as closed-loop bandwidth, and determining cavity detuning can be performed interactively and as part of a Continuous Integration (CI) process. This paper describes the design, implementation, and performance of the cavity emulators.
