Analysis of Cavity BPM Data and Experiments by Mikey Davis
Explore the analysis of Cavity BPM data from various experiments conducted by Mikey Davis on 1st June 2012. The experiments include signal matching, phase locking, down mixing, and more, with detailed visual insights provided.
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Presentation Transcript
Analysis of the Cavity BPM Data 1st June 2012 Mikey Davis 1/16
Introduction I did several different experiments over the trip I shall present these along with some analysis of the data 1st June 2012 Mikey Davis 2/16
Standard Signals 1st June 2012 Mikey Davis 3/16
Signal With X Lo Matched 1st June 2012 Mikey Davis 4/16
Phase Locking the X Signal It should be possible to lock the phase of the x LO signal to the beam arrival like the y LO. If we then adjust the frequency to get a homodyne signal we should get a signal we can use I tried to do this 1st June 2012 Mikey Davis 5/16
Signal With X Lo Phase Locked 1st June 2012 Mikey Davis 6/16
Phase Locked Lo Continued This has clearly not worked Glenn has pointed out that I would need to adjust the frequency of the X Lo to be some multiple of the master oscillator frequency 1st June 2012 Mikey Davis 7/16
Stewarts Procedure Stewart first down mixes using a complex Lo ? ??????? ? ?? ?????????? ????(??) ?????? = ?=0 Where g(t) is a Gaussian filter: 2?? exp ?2(2??)2 ? ? = 2 1st June 2012 Mikey Davis 8/16
Amplitude and Phase The Amplitude is then given by: ????(??) ? ? ?? = ???(??) And the Phase by: ??[???? ??] ??[??????] ?? = arctan 1st June 2012 Mikey Davis 9/16
Down Mixed Signal(Amplitude) 1st June 2012 Mikey Davis 10/16
Down Mixed Signal(Phase) 1st June 2012 Mikey Davis 11/16
Lo Frequency 1st June 2012 Mikey Davis 12/16
Optimum Lo Frequency 1st June 2012 Mikey Davis 13/16
Filter Bandwidth 1st June 2012 Mikey Davis 14/16
Ln Amplitude 1st June 2012 Mikey Davis 15/16
Conclusions We can rather unsurprisingly use the FONT V board to record Data from the cavity electronics If we want to go down the DDC route I would think we d need a simpler method If not we could still try Honda s electronics or a correctly phase locked Lo. 1st June 2012 Mikey Davis 16/16
