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<TITLE>Which detector settings should I choose?</TITLE>
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<H1><A NAME="SECTION00410000000000000000">
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Which detector settings should I choose?</A>
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</H1>
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<P>
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The choice of the operation settings is very important in order to obtain good quality data.
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<BR>
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Normally slower settings will reduce the electronics noise and therefore it is possible to work at lower energies, but will saturate for high photon fluxes.
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<BR>
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On the other hand, faster settings will allow to work with higher photon intensities without pileup, but not to access lower energies because of an higher electronics noise.
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<BR>
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Therefore it is extremely important to chose adequate settings for the detector depending on the X-ray energy and expected maximum count rate.
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In the following is a description of the energy and intensity range coverd by the different settings for each detector.
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<P>
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<H2><A NAME="SECTION00411000000000000000">
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MYTHEN</A>
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</H2>
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<P>
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Normally the user can follow these rules:
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<OL>
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<LI>If the X-ray energy is lower than 8 keV the <I>High gain</I> setting should be used. Since it is a slow mode of operation it is necessary to take care that the maximum count rate is lower than 100 kcounts/s for all channels (use filters to reduce the beam intensisty).
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</LI>
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<LI>For energies higher than 8 keV, the <I>Standard</I> setting is normally fine if the count rate can be kept lower than 300 kcounts/s for all channels (use filters to reduce the beam intensisty).
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<P>
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</LI>
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<LI>In case a larger count rate is required in order to keep the acquisition time shorter, the <I>Fast</I> setting must be selected. However the maximum count rate should never exceed 1 Mcounts/s for all channels.
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</LI>
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</OL>
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:settings"></A><A NAME="1148"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 3.1:</STRONG>
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Plot indicating the reccomended choice of detector settings as a function of the X-ray energy and maximum count rate per channel..</CAPTION>
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<ADDRESS>
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Thattil Dhanya
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2017-09-27
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