Status of the CEBAF Energy Upgrade RF Control System

Conference · Fri Apr 01 04:00:00 EDT 2011

OSTI ID:1996919

Hovater, James; Allison, Trent; Bachimanchi, Ramakrishna; Lahti, George; Musson, John; Plawski, Tomasz; Seaton, Chad; Seidman, David

To support the CEBAF energy upgrade from 6 GeV to 12 GeV, the RF control system is being modernized to control the high gradient high QL superconducting cavities. 80 new LLRF systems are being built to support the upgrade. The new system incorporates a heterodyne transceiver along with I&Q sampling to measure and control magnitude and phase. A low-cost Altera FPGA is used to digitally implement the cavity control algorithms. One of the features of the system is a digital self excited loop to track the cavity over large Lorentz detuning (800 Hz) during turn on. The system has successfully completed preliminary development and is now moving into the production stage of the project. This paper discusses the design, modeling, testing and production of the new RF control system and associated peripheral systems (cavity interlocks, and resonance control).

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1996919
• Report Number(s): JLAB-ACE-10-1254; DOE/OR/23177-1317
• Country of Publication: United States
• Language: English