Difference: ClicCouplerPosition (2 vs. 3)

Revision 302 Feb 2012 - FrancisCullinan

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META TOPICPARENT name="ClicBpm"

CTF3 Cavity Pick-up to Waveguide Spacing

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Reflection and Transmission

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This time, the separation between all pick-ups and the waveguide walls were varied simultaneously.
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This time, the separation between two opposing pick-ups and the waveguide walls were varied simultaneously with the other ports terminated.
 
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CouplerRefl.png
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refcurves.png
 
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The peak reflection amplitudes seem to vary non-linearly where as the peak transmission amplitudes vary linearly.
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transcurves.png
 
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reflAmp1401.png transAmp1401.png
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The loaded Q was measured at each separation using the transmission curves between opposite ports and exponential curves were fitted to the results. The limits of these curves are printed on the graph and give values for the internal Q. In each case, the first point at a spacing of 0.15mm is ignored because it falls in a region where the behavior is different as suggested by the results below.
 
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There is also variation in the resonant frequency of several MHz.
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qfit.png
 
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reflFreq1401.png
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Combined with Measurements at Finer Spacing

 
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The loaded Q was measured at each separation using the transmission curves between opposite ports and exponential curves were fitted to the results. The limits of these curves are printed on the graph and give values for the internal Q.
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Date Ports
<-- -->
Sorted ascending
Range
23/01/2012 1,2,3,4 0.30-0.40mm in 0.01mm steps
24/01/2012 1,2,3,4 0.15-0.25mm in 0.01mm steps
28/01/2012 1,3 0.15,0.20,0.30,0.40,0.53,0.63,0.73,0.89,0.99,1.09,1.19,1.29mm
23/01/2012 1,2,3,4 0.05-0.15mm in 0.01mm steps
27/01/2012 2,4 0.15,0.20,0.30,0.40,0.53,0.63,0.73,0.89,0.99,1.09,1.19,1.29mm
 
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qmeasJan14.png
 
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Measurements at Finer Spacing

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The reflected and transmitted amplitudes suggest the strongest coupling can be found with a separation of 0.1mm

reflamp.png

 
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transamp.png

qcombined.png

However, the reflection curves also suggest the most resonant frequency is most stable with a separation greater than 0.2mm

fcurve.png

 
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