Versatile Low Level RF System For Linear Accelerators

Journal Article · Wed Jun 01 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3586061· OSTI ID:21513464

Potter, James M ^[1]

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1. JP Accelerator Works, Inc., 2245 47th Street, Los Alamos, NM 87544 (United States)

The Low Level RF (LLRF) system is the source of all of the rf signals required for an rf linear accelerator. These signals are amplified to drive accelerator and buncher cavities. It can even provide the synchronizing signal for the rf power for a synchrotron. The use of Direct Digital Synthesis (DDS) techniques results in a versatile system that can provide multiple coherent signals at the same or different frequencies with adjustable amplitudes and phase relations. Pulsing the DDS allows rf switching with an essentially infinite on/off ratio. The LLRF system includes a versatile phase detector that allows phase-locking the rf frequency to a cavity at any phase angle over the full 360 deg. range. With the use of stepper motor driven slug tuners multiple cavity resonant frequencies can be phase locked to the rf source frequency. No external phase shifters are required and there is no feedback loop phase setup required. All that is needed is to turn the frequency feedback on. The use of Digital Signal Processing (DSP) allows amplitude and phase control over the entire rf pulse. This paper describes the basic principles of a LLRF system that has been used for both proton accelerators and electron accelerators, including multiple tank accelerators, sub-harmonic and fundamental bunchers, and synchrotrons.

• OSTI ID: 21513464
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1336; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
AMPLITUDES
BARYONS
CAVITIES
CYCLIC ACCELERATORS
ELECTRONS
ELEMENTARY PARTICLES
FEEDBACK
FERMIONS
HADRONS
INTERFACES
LEPTONS
LINEAR ACCELERATORS
NUCLEONS
PHASE SHIFT
PROTONS
PULSES
RESONANCE
RF SYSTEMS
SYNCHROTRONS
SYNTHESIS