Closed Loop Testing of Microphonics Algorithms Using a Cavity Emulator

2023/11/01 by Siva P. Raman, Raman, S., Philip L. Varghese +11
Engineering · #Accelerator Physics (physics.acc-ph) #Acoustic Wave Resonator Technologies #Advanced MEMS and NEMS Technologies #FOS: Physical sciences #Microfluidic and Bio-sensing Technologies

paper · pdf · doi:10.48550/arxiv.2311.00901

openalex publication_date 2023/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

An analog crystal filter based cavity emulator is modified with reverse biased varactor diodes to provide a tuning range of around 160 Hz. The piezo drive voltage of the resonance controller is used to detune the cavity through the bias voltage. A signal conditioning and summing circuit allows the introduction of microphonics disturbance from a signal source or using real microphonics data from cavity testing. This setup is used in closed loop with a cavity controller and resonance controller to study the effectiveness of resonance control algorithms suitable for superconducting cavities.

Related

• Analog Cavity Emulators to Support LLRF Development
• Narrow bandwidth active noise control for microphonics rejection in superconducting cavities at LCLS-II
• Control algorithm tests using a virtual CW SRF cavity
• Simulation of microphonic effects in high Q_L TESLA cavities during CW operations
• SRF Cavity Emulator for PIP-II LLRF Lab and Field Testing