81 lines
2.3 KiB
HTML
81 lines
2.3 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>AMOR in TOF Mode</TITLE>
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</HEAD>
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<BODY>
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<H1>AMOR in Time Of Flight Mode</H1>
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<P>
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AMOR can be operated in time of flight mode with a large position
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sensitive detector. Measuring in this mode involves:
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<ul>
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<li>Aligning the instrument.
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<li>Configuring the histogram memory.
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<li>Configuring the chopper.
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<li>count for some time.
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</ul>
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</P>
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<h2><a name="conf">Configuring the Histogram Memory</a></h2>
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<p>
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In order to use the histogram memory, it has to be configured. Two
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things have to be taken care of:
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<ul>
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<li>Configuring the resolution.
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<li>Configuring the time binning.
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</ul>
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See also the general <a href="histogram.htm"> histogram memory</a>
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section.
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</p>
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<p>
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The resolution of the PSD in pixels can be tailored to the experiment
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at hand. To this purpose the command psdconfigure is available:
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<dl>
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<dt>psdconfigure hm <var>xsize ysize</var>
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<DD>xsize and ysize are the resolution of the detector in x
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direction (beam width) and y direction (two theta).
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</dl>
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Usually this should already have been set up for you.
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</p>
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<p>
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Configuring the time binning is a two step process:
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<ul>
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<li>Generate the time binning in SICS with the command:
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<dl>
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<dt>hm genbin <var>start step nBins</var>
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<DD>This generates an equidistant time binning starting at time start,
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with stepwidth step and nBins time bins.
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</dl>
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<li>Configure the histogram memory to use the new time binning with:
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<ul>
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<li>hm init
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</ul>
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</ul>
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Please note, that non equidistant time binnings are possible as
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well. See the main <a href="histogram.htm">histogram memory</a>
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documentation for details.
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</p>
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<h2><a name="chop">Configuring the Chopper</a></h2>
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<p>
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The most important thing about the chopper, its rotation speed, can
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not be controlled from the instrument control system. It has to be
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adjusted <strong>MANUALLY</strong> at the chopper control PC at the
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hall floor. There are two other parameters, however, which are needed
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by the detector electronics in order to process the chopper
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synchronisation signal properly. The commands are:
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<dl>
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<dt>aw
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<dd>Read the current value of the acceptance window.
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<dt>aw <var>val</var>
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<DD>Set the acceptance window to val.
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<dt>td
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<dd>Read the current value of the time to delay to start.
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<dt>td <var>val</var>
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<dd>Set the time delay to start to val.
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</dl>
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</p>
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</BODY>
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</HTML>
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