[ Identification | Description | Input parameters | Output parameters | Links ]
Monitor_nD
ComponentThis component is a general Monitor that can output 0/1/2D signals It can produce many 1D signals (one for any variable specified in option list), or a single 2D output (two variables correlation). Also, an additional 'list' of neutron events can be produced. By default, monitor is square (in x/y plane). A disk shape is also possible The 'cylinder' and 'banana' option will change that for a banana shape The 'sphere' option simulates spherical detector. The 'box' is a box. The cylinder, sphere and banana should be centered on the scattering point. The monitored flux may be per monitor unit area, and weighted by a lambda/lambda(2200m/s) factor to obtain standard integrated capture flux. In normal configuration, the Monitor_nD measures the current parameters of the neutron that is beeing detected. But a PreMonitor_nD component can be used in order to study correlations between a neutron being detected in a Monitor_nD place, and given parameters that are monitored elsewhere (at PreMonitor_nD). The monitor can also act as a 3He gas detector, taking into account the detection efficiency. The 'bins' and 'limits' modifiers are to be used after each variable, and 'auto','log' and 'abs' come before it. (eg: auto abs log hdiv bins=10 limits=[-5 5]) When placed after all variables, these two latter modifiers apply to the signal (e.g. intensity). Unknown keywords are ignored. In the case of multiple components at the same position, the 'parallel' keyword must be used in each instance instead of defining a GROUP. Possible options are Variables to record: kx ky kz k wavevector [Angs-1] ( usually axis are vx vy vz v [m/s] x=horz., y=vert., z=on axis) x y z [m] Distance, Position kxy vxy xy radius [m] Radial wavevector, velocity and position t time [s] Time of Flight energy omega [meV] lambda wavelength [Angs] p intensity flux [n/s] or [n/cm^2/s] ncounts [1] sx sy sz [1] Spin vdiv ydiv dy [deg] vertical divergence (y) hdiv divergence xdiv [deg] horizontal divergence (x) angle [deg] divergence fromdirection theta longitude [deg] longitude (x/z) [for sphere and cylinder] phi lattitude [deg] lattitude (y/z) [for sphere and cylinder] user user1 will monitor the [Mon_Name]_Vars.UserVariable{1|2} user2 to be assigned in an other component (see below) Other options keywords are: abs Will monitor the abs of the following variable or of the signal (if used after all variables) auto Automatically set detector limits for one/all all {limits|bins|auto} To set all limits or bins values or auto mode binary {float|double} with 'source' option, saves in compact files bins=[bins=20] Number of bins in the detector along dimension borders To also count off-limits neutrons (X < min or X > max) capture weight by lambda/lambda(2200m/s) capture flux exclusive absorb neutrons out of monitor limits file=string Detector image file name. default is component name, plus date and variable extension. incoming Monitor incoming beam in non flat det intermediate=[5 in %] Save ALL results every n% steps in simulation limits=[min max] Lower/Upper limits for axes (see up for the variable unit) list=[counts=1000] or all For a long file of neutron characteristics with [counts] or all events log Will monitor the log of the following variable or of the signal (if used after all variables) min=[min_value] Same as limits, but only sets the min or max max=[max_value] multiple Create multiple independant 1D monitors files no or not Revert next option outgoing Monitor outgoing beam (default) parallel Use this option when the next component is at the same position (parallel components) per cm2 Intensity will be per cm^2 premonitor Will monitor neutron parameters stored previously with PreMonitor_nD. signal=[var] Will monitor [var] instead of usual intensity slit or absorb Absorb neutrons that are out detector source The monitor will save neutron states unactivate To unactivate detector (0D detector) verbose To display additional informations 3He_pressure=[3 in bars] The 3He gas pressure in detector. 3He_pressure=0 is perfect detector (default) Detector shape options (specified as xwidth,yheight,zthick or x/y/z/min/max) box Box of size xwidth, yheight, zthick cylinder To get a cylindrical monitor (diameter is xwidth, height is yheight). banana Same as cylinder, without top/bottom, on restricted angular area; use theta variable with limits to define arc. (diameter is xwidth, height is yheight). disk Disk flat xy monitor. radius is xwidth. sphere To get a spherical monitor (e.g. a 4PI) (diameter is xwidth). square Square flat xy monitor (xwidth, yheight) EXAMPLES: MyMon = Monitor_nD( xwidth = 0.1, yheight = 0.1, zthick = 0, options = "intensity per cm2 angle,limits=[-5 5] bins=10,with borders, file = mon1"); will monitor neutron angle from [z] axis, between -5 and 5 degrees, in 10 bins, into "mon1.A" output 1D file options = "sphere theta phi outgoing" for a sphere PSD detector (out beam) and saves into file "MyMon_[Date_ID].th_ph" options = "banana, theta limits=[10,130], bins=120, y" a theta/height banana detector options = "angle radius all auto" is a 2D monitor with automatic limits options = "list=1000 kx ky kz energy" records 1000 neutron event in a file options = "multiple kx ky kz, auto abs log t, and list all neutrons" makes 4 output 1D files and produces a complete list for all neutrons and monitor log(abs(tof)) within automatic limits (for t) How to monitor any instrument/component variable into a Monitor_nD Suppose the Monitor_nD instance is named 'MyMonitor'. 1) put in your instrument DECLARE: %include "monitor_nd-lib" MONND_DECLARE(MyMonitor); // will monitor custom things in MyMonitor 2) put in your instrument INITIALIZE (optional, to set monitor name): MONND_USER_TITLE(MyMonitor, 1, "Log(age of the Captain)"); This will set 'user1' title (because of the '1', could be '2' as well). 3) put just after the component where you want to monitor (to set the value) EXTEND %{ // attach a value to user1 in MyMonitor MONND_USER_VALUE(MyMonitor, 1, log(fabs(x*y+1))); %} This will set 'user1' (because of the '1', could be '2' as well) value. The value to store in user1 may be obtained from local component variables (this requires to look into the comp code, to extract a variable name) or neutron coordinates or any instrument variable, or any other component variable (using MC_GETPAR). 4) put further in the instrument (to monitor the user1 value defined before) COMPONENT MyMonitor = Monitor_nD( xwidth = 0.1, yheight = 0.1, options="user1, auto") AT ... See also the example in PreMonitor_nD to monitor neutron parameters cross-correlations.
Name | Unit | Description | Default |
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options | str | String that specifies the configuration of the monitor The general syntax is "[x] options..." (see Descr.). | 0 |
filename | str | Output file name (overrides file=XX option). | 0 |
xwidth | m | Width/diameter of detector (x). Default is 10 cm. | 0.1 |
yheight | m | Height of detector (y). Default is 10 cm. | 0.1 |
zthick | m | Thichness of detector (z). | 0 |
xmin | m | Lower x bound of opening | 0 |
xmax | m | Upper x bound of opening | 0 |
ymin | m | Lower y bound of opening | 0 |
ymax | m | Upper y bound of opening | 0 |
zmin | m | Lower z bound of opening | 0 |
zmax | m | Upper z bound of opening | 0 |
bins | 1 | Number of bins to force for all variables. Use 'bins' keyword in 'options' for heterogeneous bins | 0 |
min | u | Minimum range value to force for all variables Use 'min' or 'limits' keyword in 'options' for other limits | -1e40 |
max | u | Maximum range value to force for all variables Use 'max' or 'limits' keyword in 'options' for other limits | 1e40 |
Name | Unit | Description | Default |
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DEFS | struct | structure containing Monitor_nD Defines | |
Vars | struct | structure containing Monitor_nD variables |
Monitor_nD.comp
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[ Identification | Description | Input parameters | Output parameters | Links ]
Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri Mar 12 17:53:43 2010