Difference between revisions of "Qweak Inelastic FFTfile PMTLED"
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(Created page with 'An attempt to use Richard Jone's FFT algorithm to filter out helicity events. Below is a histogram of an LED shining onto a PMT in Qweak. Notice the multiple peaks in the asymm…') |
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| − | An attempt to use Richard | + | An attempt to use Richard Jones' FFT algorithm on helicity. |
Below is a histogram of an LED shining onto a PMT in Qweak. Notice the multiple peaks in the asymmetry distribution. | Below is a histogram of an LED shining onto a PMT in Qweak. Notice the multiple peaks in the asymmetry distribution. | ||
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| − | Using Richard's FFT code | + | Using Richard's FFT code [[File:FFTseries.cc_RJ.txt]] |
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| − | [[File:FFTseries.cc_RJ.txt]] | ||
and the root commands | and the root commands | ||
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[[File:11498_000_PMTLedAsymFFT.png | 200 px]] | [[File:11498_000_PMTLedAsymFFT.png | 200 px]] | ||
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| + | The following frequencies appear : 10,60,120,180, 240, 300 | ||
Latest revision as of 01:29, 8 November 2011
An attempt to use Richard Jones' FFT algorithm on helicity.
Below is a histogram of an LED shining onto a PMT in Qweak. Notice the multiple peaks in the asymmetry distribution.
Using Richard's FFT code File:FFTseries.cc RJ.txt
and the root commands
.L FFTseries.cc TH1* fft=FFTseries(Mps_Tree,"qwk_pmtled","hw_sum");
The following frequencies appear : 10,60,120,180, 240, 300