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>
</tr>
<tr>
<td align="center">MCP2</th>
<td align="center">mscb008:(1,43)</th>
<td align="center">NHQ 204M</th>
</tr>
<tr>
<td align="center">PHVR400_1</th>
<td align="center">mscb008:(400,1)</th>
<td align="center">pos. NHV400</th>
</tr>
<tr>
<td align="center">PHVR400_2</th>
<td align="center">mscb008:(400,5)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">PHVR400_3</th>
<td align="center">mscb008:(400,9)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">PHVR400_4</th>
<td align="center">mscb008:(400,13)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">PHVR400_5</th>
<td align="center">mscb008:(400,17)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">NHVR400_1</th>
<td align="center">mscb008:(400,21)</th>
<td align="center">neg. NHV400</th>
</tr>
<tr>
<td align="center">NHVR400_2</th>
<td align="center">mscb008:(400,25)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">NHVR400_3</th>
<td align="center">mscb008:(400,29)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">NHVR400_4</th>
<td align="center">mscb008:(400,33)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">NHVR400_5</th>
<td align="center">mscb008:(400,37)</th>
<td align="center">&nbsp;</th>
</tr>
</table>
\section mscb MIDAS Slowcontrol Bus (MSCB)
<p>The MSCB is development at PSI (http://www.psi.ch/) driven by Stefan Ritt (stefan.ritt@psi.ch) and Reinhard Schmidt
(reinhard.schmidt@psi.ch). Their <em>very</em> sparse documentation page is found under http://midas.psi.ch.
<p>This bus is a kind of "poor man's" version of a field bus with less flexibility, but on the other hand it is optimized
for experiment environments and much cheaper (typical 20US$ per node). Although this bus is integrated into the MIDAS
data acquisition system, it can be used independently from Midas.
<p>The MSCB bus uses the RS-485 standard for commication. This standard is similar to the well-known RS-232, but uses
differential signals for superior noise immunity. The bus is controlled from a PC using an parallel port to RS-485
converter. On each bus segment, up to 256 nodes can be connected in parallel. Using one layer of repeaters, 65536
nodes can be operated on a single bus, which makes the MSCB bus suitable for large experiments typically found in
high energy physics. The bus protocol uses an addressing scheme to talk to individual nodes. Multi-master operation
is possible using a token-ring scheme.
\subsection mscb_device_list MSCB Devices used in the Nemu Experiment
<p>Here comes the list of the MSCB modules/devices used in the Nemu experiment:
- \ref scs250
- \ref scs210
- \ref scs400
- \ref scs900
\subsubsection scs250 MSCB USB submaster
<p>The scs250 is a USB computer interface to the MSCB bus. The detailed description how to
get it running under linux is found here http://pc3159:8000/Computing/63. There are two
versions of the scs250 available:
- USB powered, i.e. the scs250 <b>and</b> the MSCB bus are than powered via the USB port.
This is quite limited but nice for testing.
- MSCB powered. There must be somewhere in the MSCB network a power supply feeding the MSCB bus.
<b>Do not try to mix them!</b> If there is a power supply feeding the MSCB network (e.g. SCS crate),
the USB powered scs250 unit needs to be reconfigured (jumper inside the box ... detials to come ...)
in order to be fed by the bus and <b>NOT</b> by the USB port.
\subsubsection scs210 MSCB RS232 interface module
<p>The scs210 is a RS232 interface to the MSCB bus.
\subsubsection scs400 MSCB Thermo Coupler Card
<p>8 channel thermo coupler card with digital output to control a power thyristor box.
\subsubsection scs900 MSCB ADC/DAC card
<p>8 cannel ADC/DAC card. ADC channels -10 to<00>n="center">&nbsp;</td>
</tr>
<tr>
<td align="center">SCS1001_PUMP</td>
<td align="center">52</td>
<td align="center">mscb007:(1,1)</td>
<td align="center">(Group, Node)</td>
</tr>
<tr>
<td align="center">SCS400</td>
<td align="center">60</td>
<td align="center">mscb006:(1,10)</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">SampleCryo</td>
<td align="center">70</td>
<td align="center">(2)</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">ModCryo</td>
<td align="center">71</td>
<td align="center">(3)</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">HV</td>
<td align="center">72</td>
<td align="center">psts04:4015</td>
<td align="center">FUG's</td>
</tr>
<tr>
<td align="center">HV Detectors</td>
<td align="center">73</td>
<td align="center">(4)</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">Danfysik</td>
<td align="center">81</td>
<td align="center">psts04:4029</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">Bruker</td>
<td align="center">82</td>
<td align="center">psts04:4021</td>
<td align="center">&nbsp;</td>
</tr>
<tr>
<td align="center">LEMVAC</td>
<td align="center">100</td>
<td align="center">lemvacuum:2000</td>
<td align="center">&nbsp;</td>
</tr>
</table>
<p>
<table border="1">
<tr>
<th colspan="3" align="center">(1)</th>
</tr>
<tr>
<th align="center">Name</th>
<th align="center">Port</th>
<th align="center">Comment</th>
</tr>
<tr>
<td align="center">SCS900_1</th>
<td align="center">mscb006:(1,1)</th>
<td align="center">(Group, Node)</th>
</tr>
<tr>
<td align="center">SCS900_2</th>
<td align="center">mscb006:(1,2)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">SCS900_3</th>
<td align="center">mscb006:(1,3)</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">SCS900_4</th>
<td align="center">mscb006:(1,4)</th>
<td align="center">&nbsp;</th>
</tr>
</table>
<table border="1">
<tr>
<th colspan="3" align="center">(2)</th>
</tr>
<tr>
<th align="center">Name</th>
<th align="center">Port</th>
<th align="center">Comment</th>
</tr>
<tr>
<td align="center">LS340_Sample</th>
<td align="center">psts04:4019</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">Bronkhorst</th>
<td align="center">psts04:4022</th>
<td align="center">&nbsp;</th>
</tr>
</table>
<table border="1">
<tr>
<th colspan="3" align="center">(3)</th>
</tr>
<tr>
<th align="center">Name</th>
<th align="center">Port</th>
<th align="center">Comment</th>
</tr>
<tr>
<td align="center">LS340_CF</th>
<td align="center">psts04:4017</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">LS340_Shield</th>
<td align="center">psts04:4018</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">XTC</th>
<td align="center">psts04:4023</th>
<td align="center">&nbsp;</th>
</tr>
<tr>
<td align="center">LN2</th>
<td align="center">psts04:4024</th>
<td align="center">Twickenham</th>
</tr>
<tr>
<td align="center">West6100</th>
<td align="center">psts04:4028</th>
<td align="center">&nbsp;</th>
</tr>
</table>
<table border="1">
<tr>
<th colspan="3" align="center">(4)</th>
</tr>
<tr>
<th align="center">Name</th>
<th align="center">Port</th>
<th align="center">Comment</th>
</tr>
<tr>
<td align="center">TD1</th>
<td align="center">mscb008:(1,41)</th>
<td align="center">(Group, Node)<br>NHQ 205M</th>
</tr>
<tr>
<td align="center">TD2</th>
<td align="center">mscb008:(1,42)</th>
<td align="center">NHQ 205M</th>
</tr>
<tr>
<td align="center">MCP1</th>
<td align="center">mscb008:(1,43)</th>
<td align="center">NHQ 204M</th<00>periments.
\subsection fug High Voltage FUG's
<p>The FUG's are the high volatge source for the low energy muon beamline (tertiary
beamline). There are at the moment 12 such HV devices with different maximal high voltage.
Since these devices have only an analog inputs to control the high voltage and the
current limit, an additional hardware interface is used, in order to enable a computer
controlled operation. This hardware interface consists of field point modules from
'National Instruments'.
\subsection hvr400 MSCB HVR400 High Voltage Modules
<p>To be written yet ...
\subsection k2700 Keithley 2700 Multimeter
<p>The Keithley 2700 multimeter, including a 7700 scanner card, is misused for
multiple purposes. It is measuring the valve positions of the UHV system of the
apparatus, measuring the LN2 level of the 'DeMaCo' LN2 system, measuring the current
sent through the electromagnet via zero flux meter, monitors thermoelements, ...
\subsection ls340 LakeShore Temperature Controller (Type 340)
<p>The temperature controller are used to monitor and control the temperature of
the sample cryostates as well as to monitor the temperature of the moderation
cryostate.
\subsection lemvacDD Vacuum Control Interface
<p>The vacuum controller device driver (lemvac) handles the communication between the
Nemu Siemens SPS vacuum control unit and MIDAS.
There is a Qt GUI (\ref lemvac) available which presents the informations in an user
friendly way.
\subsection ltc21 Neocera LTC-21 Temperature Controller
<p>We use this temperature controller for our moderation cryostat. It is mainly used
as a monitor device.
\subsection mirror Mirror Controller
<p>The mirror controller can change/read the angular setting of the mirror of the
tertiary beamline. The mirror is used to separate the low energy muons from the high
energy ones. The mirror controller is a home build <em>MONSTER</em> with an RS232
interface programmed in some BASIC dialect, which is slow and errorsome.
\subsection scs400DD MSCB SCS400 Thermo Coupler Card
<p>8 channel thermo coupler card with digital output to control a power thyristor box.
\subsection scs900DD MSCB SCS900 ADC/DAC Card
<p>8 cannel ADC/DAC card. ADC channels -10 to 10V, 16 bit. DAC -10 to 10V, 12bit.
\subsection twickenham LN2 Level Meter, Twickenham
<p>The twickenham LN2 level meter is used to monitor the LN2 level in one of our 200l
LN2 dewars.
\subsection west6100 Needle Valve Controller 'West 6100' for the moderation cryostat 'Moddy'
<p>The multi purpose PID controller 'West 6100' is used in our experiment as a needle valve
controller for the moderation cryostate (called 'Moddy'). The needle valve is tuning the amount
of LHe the cold finger region of Moddy can enter.
\subsection xtc Microbalance Controller, XTC
<p>The XTC is a microbalance controller connect to a crystal oscillator which is used
to measure the deposition rate/thickness of the Van der Waals gases used to grow the
moderator.
\section nemu_midas_event_ids Nemu MIDAS Event ID's List
<p>MIDAS handles events via envent id's (EID). The EID are used to handle the events also
in the history system (mlogger).
<p>In order to put some logic into the system we decided that the EID will have the following
general structure.
<table border="1">
<tr>
<td>EID</td>
<td>Purpose</td>
</tr>
<tr>
<td>&lt;50</td>
<td>Fast hardware related events
</tr>
<tr>
<td>&gt;50</td>
<td>Slow controll related events</td>
</tr>
</table>
<p>Here is the table of the Nemu experiment EID.
<table border="1">
<tr>
<th align="center">Name</th>
<th align="center">Event ID</th>
<th align="center">Port Info</th>
<th align="center">Comment</th>
</tr>
<tr>
<td align="center">SCS900</td>
<td align="center">51</td>
<td align="center">(1)</td>
<td alig<00> the following purpose: At startup this routine is called and allows to send
the <b>class driver</b> default names for the labels in the ODB of the different chanels.
\subsection cmd_get CMD_GET
<p>Linked to this tag, an get routine of the DD is called. This get routine
has the following purpose: It reads a measured value from the device with the help of
the <b>bus driver</b>. The <b>bus driver</b> binding is done via macros (which is not
the most beautiful approach.)
\subsection cmd_set CMD_SET
<p>Linked to this tag, an set routine of the DD is called. This set routine
has the following purpose: It sends a demand value to the device with the help of
the <b>bus driver</b>. The <b>bus driver</b> binding is done via macros (which is
not the most beautiful approach.)
\subsection cmd_set_label CMD_SET_LABEL
<p>Linked to this tag, an set label routine of the DD is called. <em>Have no idea
what the meaning of this label is. It is not used in any of our DD.</em>
\subsection cmd_get_demand CMD_GET_DEMAND (gerneric, hv)
<p>Linked to this tag, an get demand routine of the DD is called. This get demand routine
has the following purpose: It reads the demand value from the device back, this with
the help of the <b>bus driver</b>. The <b>bus driver</b> binding is done via macros
(which is not the most beautiful approach.)
\subsection cmd_get_default_threshold CMD_GET_DEFAULT_THRESHOLD (gerneric)
<p><em>This command tag is not used in any of our DD.</em>
\subsection cmd_get_all CMD_GET_ALL (hv)
<p>Linked to this tag is a routine which reads back all the high voltage values
of all the channels of the HV device.
\subsection cmd_get_current CMD_GET_CURRENT (hv)
<p>Linked to this tag is a routine which reads back all the measured current value
of a specific channel of the HV device.
\subsection cmd_get_current_all CMD_GET_CURRENT_ALL (hv)
<p>Linked to this tag is a routine which reads back all the measured current values
of all the channels of the HV device.
\subsection cmd_set_all CMD_SET_ALL (hv)
<p>Linked to this tag is a routine which sets all the demand high voltage values
of all the channels of the HV device.
\subsection cmd_set_current_limit CMD_SET_CURRENT_LIMIT (hv)
<p>Linked to this tag is a routine which sets the current limit
of a specific channel of the HV device.
\subsection cmd_set_current_limit_all CMD_SET_CURRENT_LIMIT_ALL (hv)
<p>Linked to this tag is a routine which sets the current limits
of all the channels of the HV device.
\section list List of the device drivers (DD) used in the LE-uSR experiment
- \ref bronkhorst Mass Flow Meter (bronkhorst.h, bronkhorst.c)
- \ref bruker (bruker.h, bruker.c)
- \ref fug (hv_fug.h, hv_fug.c)
- \ref hvr400 (hvr400.h, hvr400.c)
- \ref ls340 LakeShore 340 (LakeShore340.h, LakeShore340.c)
- \ref lemvacDD (lemvac.h, lemvac.c)
- \ref mirror (mirror.h, mirror.c)
- \ref scs400DD (scs400.h, scs400.c)
- \ref scs900DD (scs900.h, scs900.c)
- \ref twickenham (twickenham.h, twickenham.c)
- \ref west6100 (west6100.h, west6100.c)
- \ref xtc (xtc.h, xtc.c)
\subsection bronkhorst Bronkhorst
<p>The bronkhorst mass flow meter for He gas is used together with the
'BS Cryovac' (temperature range 4.5K - 300K) and the 'Mango Cryo' (temperature
range 2K - 300K). For the 'BS Cryovac' it is placed between the cryo and the
alcatel try pump and is regulating the He gas flow (for details regarding the
operatrion of the bronkhorst flow meter see the operation manual for the 'BS Cryovac').
In case of the 'Mango Cryo' the bronkhorst is regulating the He gas flow at
the phase separator.
\subsection bruker Bruker Power Supply
<p>The bruker power supply (0..500A, max. 75V) is used as the current source for the
electromagnets generating the magnetic field for TF-uSR ex<00>p>Every DD has an entry function which looks something like:
<pre>
INT bruker(INT cmd, ...)
{
va_list argptr;
HNDLE hKey;
INT channel, status;
float value, *pvalue;
void *info, *bd;
char *name;
DWORD flags;
va_start(argptr, cmd);
status = FE_SUCCESS;
switch (cmd) {
case CMD_INIT:
hKey = va_arg(argptr, HNDLE);
info = va_arg(argptr, void *);
channel = va_arg(argptr, INT);
flags = va_arg(argptr, DWORD);
bd = va_arg(argptr, void *);
status = bruker_init(hKey, info, channel, bd);
break;
case CMD_EXIT:
info = va_arg(argptr, void *);
status = bruker_exit(info);
break;
case CMD_GET:
info = va_arg(argptr, void *);
channel = va_arg(argptr, INT);
pvalue = va_arg(argptr, float*);
status = bruker_get(info, channel, pvalue);
break;
case CMD_GET_DEFAULT_NAME:
info = va_arg(argptr, void *);
channel = va_arg(argptr, INT);
name = va_arg(argptr, char *);
status = bruker_get_default_name(info, channel, name);
break;
case CMD_SET:
info = va_arg(argptr, void *);
channel = va_arg(argptr, INT);
value = (float) va_arg(argptr, double);
status = bruker_set(info, channel, value);
break
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