3D Diamond Detectors: Update on Current Work Steven A. Murphy 16 th July 2014

TRIBICC Analysis – What is it? 2 3D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Time Resolved Ion Beam Induced Charge Collection Fire protons into our sample, and proton produces ionisation path in diamond. Produced charge carriers drift to electrodes Measure signal over time at a specific location Data obtained from Zagreb during December 2013 Aim to determine charge carrier lifetimes in Manchester diamond detector

TRIBICC Analysis – Order of Events 33D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy One data file per position Data file is read, and script tries to apply a fit to the data (signal vs time), finds best fit from varying fit parameters Fit gives a measurement of rise and decay times of signal, and chi squared of fit. Repeat across all positions, and can produce a map of chi squared etc.

TRIBICC Analysis – Data Discrimination 43D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Three data types: a) noise, b) real data (long decay time), c) amplifier “ringing” (short decay time) Eliminate noise by summing the signals from a file. A low sum implies the signals average around zero; of order >1 implies real data Need to isolate b) from c) (currently done using chi squared; around 1 implies good fit, so real data) – will improve in future c) a) b)

TRIBICC Analysis – Fitting 53D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Fitting function is a linear rise, then an exponential decay Potential to fit a damped oscillator to decay side to fit “ringing” from amplifier Other functions to fit the signal rise tried (exponential, sinusoid to match ringing), but proved less successful (from observing chi squared of fits)

TRIBICC Analysis – Results 63D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Can plot high chi squared fits as a function of position Plot gives an indication as to problem areas, or could indicate if fits worsen nearer/ further from electrodes Needs improvement as “ringing” events need to be accounted for

TRIBICC Analysis – Results 73D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Plot average waveform from events to see the “expected” outcome Results can be compared to simulation (from Giulio) Possible to bin areas and see waveform differences – help determine performance nearer/ further from electrodes Including high chi squared plots results in shorter decay times and ringing effect prominent

TRIBICC Analysis – Results 83D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Overlay of plots can be compared to average plots to see if the result is “reasonable” General shape seems reasonable, although some very clear outliers! Aim to identify these high signal scans (masked out from averaging) Investigate whether average signal should be much higher (naively expect averaged signal should be of order 0.15 from overlay)

TRIBICC Analysis – Future Work 93D Diamond Pixel Detectors Update: 3rd June 2014 S. A. Murphy Try and account for ringing events; the short decay times could trigger the amplifier ringing, so must be included Update plot of chi squared against position to see where “trouble areas” are (i.e. where there is noise/ poor fits) Bin data to find average waveform at certain positions