Changeset 5784


Ignore:
Timestamp:
01/10/05 18:46:12 (20 years ago)
Author:
gaug
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*** empty log message ***
Location:
trunk/MagicSoft/TDAS-Extractor
Files:
2 edited

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  • trunk/MagicSoft/TDAS-Extractor/23LedsBlue_Pulse_Inner.eps

    r5643 r5784  
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  • trunk/MagicSoft/TDAS-Extractor/Performance.tex

    r5721 r5784  
    44
    55In this section, we describe the tests performed using light pulses of different colour,
    6 pulse shapes and intensities with the MAGIC calibration pulser box.
     6pulse shapes and intensities with the MAGIC LED Calibration Pulser Box \cite{hardware-manual}.
    77\par
    88The LED pulser system is able to provide fast light pulses of 3--4\,ns FWHM
     
    1212\begin{table}[htp]
    1313\centering
    14 \begin{tabular}{|c|c|c|c|c|c|}
    15 \hline
    16 \hline
    17 \multicolumn{6}{|c|}{The possible pulsed light colours} \\
    18 \hline
    19 \hline
    20 Colour &  Wavelength & Spectral Width & Min. Nr. &  Max. Nr. & Secondary \\
    21       & [nm]         & [nm]           &  Phe's   &  Phe's    & Pulses  \\
    22 \hline
    23 Green &  520      & 40      & 6          &  120      & yes  \\
    24 \hline
    25 Blue &  460       & 30      & 6          &  500      & yes  \\
    26 \hline
    27 UV   &  375       & 12      & 3          &  50       & no  \\
     14\begin{tabular}{|c|c|c|c|c|c|c|}
     15\hline
     16\hline
     17\multicolumn{7}{|c|}{The possible pulsed light colours} \\
     18\hline
     19\hline
     20Colour &  Wavelength & Spectral Width & Min. Nr. &  Max. Nr. & Secondary & FWHM \\
     21      & [nm]         & [nm]           &  Phe's   &  Phe's    & Pulses  &  Pulse [ns]\\
     22\hline
     23Green &  520      & 40      & 6          &  120      & yes  & 3--4 \\
     24\hline
     25Blue &  460       & 30      & 6          &  500      & yes  & 3--4 \\
     26\hline
     27UV   &  375       & 12      & 3          &  50       & no   & 2--3 \\
    2828\hline
    2929\hline
     
    4040One can see that the very stable UV-pulses are unfortunately only available in such intensities as to
    4141not saturate the high-gain readout channel. However, the brightest combination of light pulses easily
    42 saturates all channels in the camera, but does not reach a saturation of the low-gain channel.
     42saturates all channels in the camera, but does not reach a saturation of the low-gain readout.
    4343\par
    4444Our tests can be classified into three subsections:
     
    4949of the expected Gaussian distribution.
    5050\item Number of photo-electrons: These tests measure the reconstructed numbers of photo-electrons, their
    51 spread over the camera and the ratio of the obtained mean value for outer and inner pixels.
    52 \item Linearity tests: These test the linearity of the extractor with respect to pulses of different intensity
    53 and colour.
     51spread over the camera and the ratio of the obtained mean values for outer and inner pixels, respectively.
     52\item Linearity tests: These tests measure the linearity of the extractor with respect to pulses of
     53different intensity and colour.
    5454\item Time resolution: These tests show the time resolution and stability obtained with different
    5555intensities and colours.
     
    7171\includegraphics[height=0.25\textheight]{23LedsBlue_Pulse_Inner.eps}
    7272\includegraphics[height=0.25\textheight]{23LedsBlue_Pulse_Outer.eps}
    73 \caption{Example of a calibration pulse from the highest available intensity (23\,Leds Blue).
     73\caption{Example of a calibration pulse from the highest available mono-chromatic intensity (23\,Leds Blue).
    7474The left plot shows the signal obtained in an inner pixel, the right one the signal in an outer pixel.
    75 One the left side, the (saturated) high-gain channel is visible, on the right side, the delayed low-gain
    76 pulse appears. Note that on the left side, there is a secondary pulses visible in the tail of the
     75One the left side of both plots, the (saturated) high-gain channel is visible,
     76on the right side from FADC slice 18 on,
     77the delayed low-gain
     78pulse appears. Note that in the left plot, there is a secondary pulses visible in the tail of the
    7779high-gain pulse. }
    7880\label{fig:pulseexample23ledblue}
     
    8183We used data taken on the 7$^{th}$ of June, 2004 with different pulser LED combinations, each taken with
    828416384 events. The corresponding run numbers range from nr. 31741 to 31772. This data was taken before the
    83 latest camera repair access which replaced about 2\% of the pixels known to be mal-functionning at that time.
    84 Thus, there is a lower limit to the number of un-calibrated pixels of about 1.5--2\%.
    85 \par
    86 Although, we had looked at and tested all colour and extractor combinations resulting from these data,
     85latest camera repair access which resulted in a replacement of about 2\% of the pixels known to be
     86mal-functionning at that time.
     87Thus, there is a lower limit to the number of un-calibrated pixels of about 1.5--2\% known
     88mal-functionning pixels.
     89\par
     90Although we had looked at and tested all colour and extractor combinations resulting from these data,
    8791we refrain ourselves to show here only exemplary behaviour and results of extractors.
    8892All plots, including those which are not displayed in this TDAS, can be retrieved from the following
     
    103107\begin{enumerate}
    104108\item The reconstructed mean signal is less than 2.5 times the extractor resolution $R$ from zero.
    105 (2.5 Pedestal RMS in the case of the simple fixed window extractors). This criterium cuts out
     109(2.5 Pedestal RMS in the case of the simple fixed window extractors, see section~\ref{sec:pedestals}).
     110This criterium essentially cuts out
    106111dead pixels.
    107112\item The reconstructed mean signal error is smaller than its value. This criterium cuts out
     
    109114criterium cuts out ``ringing'' pixels or mal-functionning extractors.
    110115\item The reconstructed mean number of photo-electrons lies 4.5 sigma outside
    111 the distribution of photo-electrons obtained with the inner or outer pixels in the camera.
    112 \item All reconstructed negative mean signal, signal sigma's and mean numbers of photo-electrons
    113 smaller than one.
     116the distribution of photo-electrons obtained with the inner or outer pixels in the camera, respectively.
     117This criterium cuts out pixels channels with apparently deviating (hardware) behaviour compared to
     118the rest of the camera readout.
     119\item All pixels with reconstructed negative mean signal or with a
     120mean numbers of photo-electrons smaller than one. Pixels with a negative pedestal RMS subtracted
     121sigma occur, especially when stars are focussed onto that pixel during the pedestal taking (resulting
     122in a large pedestal RMS), but have moved to another pixel during the calibration run. In this case, the
     123number of photo-electrons would result artificially negative. If these
     124channels do not show any other deviating behaviour, their number of photo-electrons gets replaced by the
     125mean number of photo-electrons in the camera, and the channel is further calibrated as normal.
    114126\end{enumerate}
    115127
    116128Moreover, the number of events are counted which have been reconstructed outside a 5 sigma region
    117129from the mean signal. These events are called ``outliers''. Figure~\ref{fig:outlier} shows a typical
    118 outlier obtained with the digital filter.
     130outlier obtained with the digital filter applied to a low-gain signal.
    119131
    120132\begin{figure}[htp]
     
    166178One can see that in general, big extraction windows raise the
    167179number of un-calibrated pixels and are thus less stable. Especially for the very low-intensity
    168 $1LedUV$-pulse, the big extraction windows summing 8 or more slices, cannot calibrate more than 50\%
     180$1Led\,UV$-pulse, the big extraction windows summing 8 or more slices, cannot calibrate more than 50\%
    169181of the inner pixels (fig.~\ref{fig:unsuited:1leduv}). This is an expected behavior since big windows
    170182add up more noise which in turn makes the for the small signal more difficult.
     
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