High Precision RF Pulse Shaping with Direct RF Sampling for Future Linear Accelerators

2025/05/28 by Chao Liu, Ankur Dhar, Liu, Chao +5 · 4 citations
Engineering · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics

paper · pdf · doi:10.48550/arxiv.2505.22872

openalex publication_date 2025/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In various of particle accelerator designs, amplitude and phase modulation methods are commonly applied to shape the RF pulses for implementing pulse compressors or compensating for the fluctuations introduced by the high-power RF components and beam loading effects. Phase modulations are typically implemented with additional phase shifters that require drive or control electronics. With our recent next-generation LLRF (NG-LLRF) platform developed based on direct RF sampling technology of RF system-on-chip (RFSoC) devices, RF pulse shaping can be realized without the analogue phase shifters, which can significantly simplify the system architecture. We performed a range of high-power experiments in the C-band to evaluate the RF pulse-shaping capabilities of the NG-LLRF system at different stages of the RF circuits. In this paper, the high-power characterization results with the Cool Copper Collider (C3) structure driven by RF pulses with different modulation schemes will be described. With the pulse modulation and demodulation completely implemented in the digital domain, the RF pulse shaping schemes can be rapidly adapted for X-band structures simply by adding analogue mixers.

Cited by

• Low Level RF and Timing System Design for the Cool Copper Collider
• High Power Arbitrary RF Pulse Shaping Tests with NG-LLRF and Cool Copper Collider Prototype Structure
• Nanosecond Radio-Frequency Pulse Driven Photogun for Very Hard X-ray Free-electron Laser
• Next generation direct RF sampling LLRF control and monitoring system for linear accelerators

Related

• High Power Arbitrary RF Pulse Shaping Tests with NG-LLRF and Cool Copper Collider Prototype Structure
• High-Power Test of a C-band Linear Accelerating Structure with an RFSoC-based LLRF System
• Low Level RF and Timing System Design for the Cool Copper Collider
• Next generation direct RF sampling LLRF control and monitoring system for linear accelerators
• Direct RF Sampling based LLRF Control System for C-band Linear Accelerator