Improvements in LLRF Control Algorithms and Automation - Desy
Improvements in LLRF Control Algorithms and Automation - Desy
Improvements in LLRF Control Algorithms and Automation - Desy
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<strong>LLRF</strong> FSM: Adaptive Feedforward (Algorithm)<br />
1. It is easy do derive that the cavity (a b<strong>and</strong>pass) acts as a<br />
lowpass on the envelope signal, i.e. . The<br />
<strong>in</strong>version is<br />
i.e. a proportional part <strong>and</strong> a differential part.<br />
2. Apply appropriate signal smooth<strong>in</strong>g (justified by long<br />
timeconstant, 700µs, of the cavities).<br />
3. Apply the algorithm <strong>in</strong> an iterative fashion.<br />
Collect data of 10 Pulses<br />
<strong>and</strong> do some statistics<br />
Apply <strong>in</strong>verted lowpass filter<br />
on error signal (probe-setpo<strong>in</strong>t)<br />
Add result to exist<strong>in</strong>g<br />
Feedforward table<br />
September 7 th 2004 alex<strong>and</strong>er.br<strong>and</strong>t@desy.de 11/14
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