cbcd98c10c
This directory was accidentally omitted from the merge-release branch during the PSI code merge.
74 lines
3.7 KiB
XML
74 lines
3.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<?oxygen RNGSchema="http://www.oasis-open.org/docbook/xml/5.0/rng/docbook.rng" type="xml"?>
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<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0">
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<info><title>11 Tesla Magnet</title><author>
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<personname>Ferdi Franceschini</personname>
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</author>
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<date>2008-08-29 16:47</date>
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</info>
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<sect1>
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<title>Configuration</title>
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<para>The driver is loaded into SICS by adding the following line in the
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<literal>/usr/local/sics/extraconfig.tcl</literal> file </para>
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<para><command>select_environment_controller "11TMagnet"</command></para>
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<para>Make sure that the other entries are commented out, save the file and restart SICS.</para>
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<para>This will set up the lakeshore temperature controller as well as the magnet power
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supply control. They will appear as <varname>tc1</varname> and <varname>ips120</varname>
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under the <varname>sample</varname> group in GumTree.</para>
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</sect1>
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<sect1>
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<title>Commands</title>
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<para>When the magnet power supply is switched on it sets itself to "clamped" mode. This
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means that the output is short-circuited. </para>
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<para><emphasis> You must unclamp it to set the magnetic field.</emphasis></para>
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<variablelist>
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<varlistentry>
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<term><command>hset /sample/ips120/Control/A 0</command></term>
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<listitem>
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<para>Unclamps the magnet</para>
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<para><emphasis>It will show that it's at zero already, set it
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anyway</emphasis></para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><command>drive ips120_driveable </command><replaceable>n</replaceable></term>
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<listitem>
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<para>Drive the magnet to <replaceable>n</replaceable> Tesla</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect1>
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<sect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><command>/sample/ips120/sensor/value </command></term>
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<listitem>
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<para>This reading is taken from the power supply leads while the magnet is
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ramping up. </para>
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<para>After the setpoint has been reached and the magnet is "holding" the field
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then SICS will read the field from the magnet status register of the power
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supply.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect1>
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<sect1>
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<title>Description</title>
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<para>The magnet is normally in persistent mode (switch heater off) with the power supply at
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zero amps. The <command>drive</command> command drives the power supply to the magnet
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current, takes the magnet out of persistent mode (turns the switch heater on), drives
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the magnet to the new field, returns the magnet to persistent mode (turns the switch
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heater off) and ramps the power supply current back to zero. </para>
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<para>There are time delays to allow the switch to operate. </para>
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</sect1>
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<sect1>
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<title>Known Issues</title>
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<para>If you set the limits to run at maximum magnet field, but do not run the lambda plate,
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<emphasis>you will quench the magnet. </emphasis> This driver does not check to see
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if the magnet temperature when driving maximum field. The SICS anticollider should be
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used to set allowed values.</para>
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</sect1>
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</chapter>
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