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MCP Delay Line (Version 6.2.90.5)
acquired or re-sorted from a list-mode file, the value of the coordinate for each event will be attributed to the closest bin’s
value and the histogram content in this bin will be incremented by one unit (along the Y-axis of the graph). For example such
a histogram (spectrum) could show the distribution of time sum values for a number of acquired events.
Likewise it is possible to display two-dimensional spectra, i.e. the coincident occurrence of values in two coordinates within
the corresponding bin widths (for example the 2d position distribution of the detected particles). To visualize such a
histogram the two coordinates span a plane (X/Y), the value in each bin (Z) is displayed as gray or color code, or contour
lines are used for the display. The range of the displayed spectra in X, Y (and Z), the bin size and the “unit” of incrementing
can be defined for optimal visualization and manipulation.
To analyze higher dimensional coordinate correlations it is possible to “gate” the sorting process into a histogram (spectrum)
by defining a
condition
for this spectrum. Such a condition can be a “window” on the occurrence of a certain range of
values in a third coordinate for the events. For example one needs to visualize the (2d) position spectra of particles as
function of their time-of-flight (TOF)
. Then one can define several conditions (gates) on the TOF coordinate (e.g. time sum
peaks) and several 2d position spectra with the different conditions. It is possible to link different conditions (e.g. by an
“AND”) to allow the analysis of even higher dimensional coordinate correlations.
For details about the definition of spectra and conditions, for spectrum manipulation options and data I/O to other
programs please refer to the
CoboldPC
manual. In the “spectra.ccf” you find some pre-defined conditions (as an example)
and spectra that will allow you to view the most important coordinates. For example, you will immediately be able to see a
position spectrum.
You may now edit the “xxx Standard.ccf” and all subprograms (especially the “spectra.ccf”) to adjust them to your needs, e.g.
setting the right condition gates on the time sum peak(s), omitting spectra that you do not need, adjust parameters (for
shifting or rotating the spectra, calibrating position and time), changing or adding spectrum definitions.
Please note that these functions are only “first level” modifications of the data acquisition and analysis option provided by
CoboldPC
. More advanced data treatments like defining new (computed) coordinates to the analysis can be done by
additionally modifying the DAN.dll using a MS C++ or Fortran compiler. Please refer to the
CoboldPC
manual for details.
Also, there is a “zero-level” of operating for the recent
CoboldPC
2002
versions, allowing to address the
CoboldPC
commands by a scripting language. Again, for details refer to the
CoboldPC
manual.
If you are ready to run a session with the hardware now, you may execute the “xxx Standard.ccf” file again and click the
hardware button. But before make sure to follow the steps lined out in the chapter 5.
*
In order to allow for such a measurement one needs to use a different TDC connection scheme than the proposed start-up
configuration in section 5.3
Summary of Contents for DLD120
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