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Decoupling PI controller design for a normal conducting RF cavity using a recursive LEVENBERG-MARQUARDT algorithm
This paper addresses the system identification and the decoupling PI controller design for a normal conducting RF cavity. Based on the open-loop measurement data of an SNS DTL cavity, the open-loop system's bandwidths and loop time delays are estimated by using batched least square. With the identified system, a PI controller is designed in such a way that it suppresses the time varying klystron d...Show More
Frequency shift observer for an SNS superconducting RF cavity
In contrast to a normal conducting RF cavity, a superconducting RF cavity is very susceptible to shifts in its resonance frequency. The main sources of the shift are Lorentz force detuning and microphonics. In a spallation neutron source, to compensate for the frequency shift, a feedforward control is to be applied. In this paper, as an initiative step, a frequency shift observer is proposed which...Show More
Excess RF power required for RF control of the Spallation Neutron Source (SNS) linac, a pulsed high-intensity superconducting proton accelerator
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (3)
A high-intensity proton linac, such as that being planned for the SNS, requires accurate RF control of cavity fields for the entire pulse in order to avoid beam spill. The current design requirement for the SNS is RF field stability within /spl plusmn/0.5% and /spl plusmn/0.5/spl deg/. This RF control capability is achieved by the control electronics using the excess RF power to correct disturbanc...Show More
System identification of the linac RF system using a wavelet method and its applications in the SNS LLRF control system
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
For a pulsed LINAC such as the SNS, an adaptive feed-forward algorithm plays an important role in reducing the repetitive disturbance caused by the pulsed operation conditions. In most modern feed-forward control algorithms, accurate real time system identification is required to make the algorithm more effective. In this paper, an efficient wavelet method is applied to the system identification i...Show More
Uncertain system modeling of SNS RF control system
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (4)
This paper addresses the modeling problem of the linear accelerator RF system for SNS. The cascade of the klystron and the cavity is modeled as a nominal system. In the real world, high voltage power supply ripple, Lorentz force detuning, microphonics, cavity RF parameter perturbations, distortions in RF components, and loop time delay imperfection exist inevitably, which must be analyzed. The ana...Show More
SNS LLRF control system model design
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
Cited by: Papers (2)
This paper addresses part of the design of the LLRF control system for the Spallation Neutron Source. Based on the Matlab/Simulink model of the Klystron and Cavity, considered as a two input two output (TITO) system, we design a PID controller which achieves the tracking of the set point reference. The PID controller design method modifies a relay-feedback-based PID auto-tuner for a single input s...Show More
Digital LLRF control system design and implementation for APT superconducting cavities
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
With a rapid development of the digital signal processor in recent years, a full digital control system for the superconducting section of APT is designed and implemented by using TI's C6x processor. A digital control system is first modeled and simulated using Matlab/Simulink. Simulation results confirmed the feasibility and flexibility of the digital control system for LLRF feedback system. Due ...Show More
Feedback linearization application for LLRF control system
Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251)
Year: 1999 | Conference Paper |
The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory will serve as the prototype for the low energy section of acceleration production of tritium (APT) accelerator. This paper addresses the problem of the low-level RF (LLRF) control system for LEDA. We propose a control law which is based on exact feedback linearization coupled with gain scheduling wh...Show More
Robust tracking of a nonlinear system with parameter uncertainties
Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)
Year: 1998 | Conference Paper |
We discuss the problem of the robust output tracking of a class of nonlinear systems which has time varying, exogenous signal and slowly-varying parameter uncertainties. The approach is based on the equilibrium manifold, which depends upon continuously both the exogenous signal and the parameter uncertainties. In order to achieve the control objective, we propose a two loop control law. The nonlin...Show More
Interval analysis application for stability margin computation of linear uncertain systems
Proceedings of 28th Southeastern Symposium on System Theory
Year: 1996 | Conference Paper |
Cited by: Papers (2)
This paper presents a numerical method to compute the stability margin of a linear parametric uncertain system. For an admissible uncertainty set in the weighted l/sub /spl infin// norm space, a branch and bound algorithm is proposed to obtain the stability margin. Bisection is performed to generate the nondecreasing sequence of the stability radii and the corresponding stability box. For each ind...Show More
A Numerical Algorithm for Robust Stabilization of A Linear Parametric Uncertain System
Proceedings of 1995 34th IEEE Conference on Decision and Control
Year: 1995 | Conference Paper |
Cited by: Papers (1)
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