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--- rt_improvement_by_post-processing [2019/02/06 14:00]
vschaefer [Post-Processing of RT Oscillation Data]
+++ rt_improvement_by_post-processing [2019/02/06 16:11] (current)
vschaefer [Basic Principle]
@@ Line 11: / Line 11: @@
 <color #ed1c24>-> insufficient e.g. for transmission control</color>
+===== Bunch Charge determination =====
+{{:bunch_charge_determination.png?direct&400|}}
+[from: "A High Stability Intensity Monitoring System", M.A. Clarke-Gayther, RAL, Didcot (UK), presented on EPAC, Sitges (E) 1996]
 {{:bild_zu_basic_principle.png?direct&400|}}
+{{:bild_zu_bunch_charge.png?direct&400|}}
+<color #7092be>Courtesy of A. Reiter</color>
+===== Post-Processing of RT Oscillation Data =====
+  * idea: : resonant frequency ω0 and decay time constant λ, are fixed by hardware
+  * omission of inexact peak detector
+  <color #ed1c24>-> improved RT resolution by digitization of oscillation data, FFT filtering and envelope fit </color>
+==== Algorithm for bunch charge determination ====
+  * FFT filtering and offset correction
+  * identification of maxima and minima until preset S/N value crossed
+  * robust estimator of exponential decay curve
+  * evaluation of amplitude ~ total pulse charge
+{{:bild1.png?direct&400|}}

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