linac 4 – control system design (small)
TRANSCRIPT
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LINAC 4 – Control System and Adaptive Feed‐forward Design
Anirban Krishna BhattacharyyaBE – RF – FB
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Introduction
Total loop delay of 1100 ns.
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Klystron Model
Error: 5.3% and 3.84%
Transfer Function
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Klystron ModelGain
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PIMS Cavity:ZTT = 24.622e6 Ω/mL = 1.298 mQ0 = 20800β = 1.24Φ = ‐20°Z0 = 50 ΩPsat = 1.4 MW
Beam current: 40 mACavity voltage: 4.805 MVPower loss: 5%
Parameters
Controller structure: , where, , and, 1+aτs
KP1+τs
Τ = KP
KI
a = 10
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PIMS Cavity Model
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Notch Filter for PIMS Cavity
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Effect of Notch
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Smith‐Predictor Design
Process model estimation:
1. 10% error in knowledge of cavity parameters and delay.
Requirements:
1. Model for process/plant.2. Estimation of time‐delay
What is this?
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Smith‐Predictor DesignOpen Loop Step Response
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Sensitivity AnalysisSensitivity of the controller parameters to ±20% variation in QL of the cavity (PIMS) is investigated.
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Feed forward
δ δ δ
1ε
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Beam Disturbance
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Results
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Results: Klystron Power
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Comparison of Cavity models
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The End
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Smith Predictor
Controller Plant
Delay
1+GCGe‐sτd
GCGe‐sτdTransfer function =>