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10.2 The TOF2E_monitor McStas Component
TOF-sensitive monitor, converting to energy
Identification
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Author: Kim Lefmann and Helmuth Schoeber
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Origin: Risoe
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Date: Sept. 13, 2006
Description
A square single monitor that measures the energy of the incoming neutrons from their time-of-flight
Example: TOF2E_monitor(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, Emin=1, Emax=50, nE=20, filename="Output.nrj", L_flight=20, T_zero=0)
Input parameters
Parameters in boldface are required; the others are optional.
|
Name |
Unit |
Description |
Default |
|
|
|||
|
nE |
1 |
Number of energy channels |
20 |
|
filename |
string |
Name of file in which to store the detector image |
0 |
|
nowritefile |
1 |
If set, monitor will skip writing to disk |
0 |
|
xmin |
m |
Lower x bound of detector opening |
-0.05 |
|
xmax |
m |
Upper x bound of detector opening |
0.05 |
|
ymin |
m |
Lower y bound of detector opening |
-0.05 |
|
ymax |
m |
Upper y bound of detector opening |
0.05 |
|
xwidth |
m |
Width of detector. Overrides xmin, xmax |
0 |
|
yheight |
m |
Height of detector. Overrides ymin, ymax |
0 |
|
Emin |
meV |
Minimum energy to detect |
|
|
Emax |
meV |
Maximum energy to detect |
|
|
T_zero |
s |
Zero point in time |
|
|
L_flight |
m |
flight length user in conversion |
|
|
restore_neutron |
1 |
If set, the monitor does not influence the neutron state |
0 |
|
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Links
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Component source code found in file TOF2E_monitor.comp.
A time-of-flight monitor with simple energy analysis
The component TOF2E_monitor resembles TOF_monitor to a very large extent. Only this monitor converts the neutron flight time to energy - as would be done in an experiment. The apparent neutron energy, \(E_\textrm {app}\) is calculated from the apparent velocity, given by \begin {equation} v_\textrm {app} = \frac {L_\textrm {flight}}{t-t_0} , \end {equation} where the time offset, \(t_0\) defaults to zero. \(E_\textrm {app}\) is binned in nchan bins between \(E_\textrm {min}\) and \(E_\textrm {max}\) (in meV).
The output parameters from TOF2E_monitor are the total counts, and a file with 1-dimensional data vs. \(E_\textrm {app}\), similar to TOF_monitor.
