[mcstas-users] uservars to reconstruct former PreMonitor_nD / Monitor_nD

[Andreas Ostermann]

Dear colleagues,

In the past, I have often used the "PreMonitor_nD / Monitor_nD" pair to 
investigate the origin of neutrons which reach the sample in a upstream 
positon. For example:

*******

COMPONENT PreMon_CS_area_mon = PreMonitor_nD(monitor_comp = CS_area_mon)
   AT (0,0,0.0001)    RELATIVE ColdSource
   ROTATED (0,0,0)  RELATIVE ColdSource

COMPONENT CS_area_mon = Monitor_nD(xmin=-0.01, xmax=0.01, ymin=-0.01, 
ymax=0.01,
                                    filename="CS_area_pre.psd",
                                    options= "x,y, all bins=50, all 
limits=[-0.12 0.12], use premonitor")
   AT (0,0,0.0008)   RELATIVE Arm_SAM_pos
   ROTATED (0,0,0) RELATIVE Arm_SAM_pos

*******

In the current versions of McStas, I am supposed to use the "uservars" 
concept to investigate or plot the status of neutrons earlier in the 
instrument. Unfortunately, after reading the manuals, it is not entirely 
clear to me how I can use the "uservars" concept to reconstruct the 
"PreMonitor_nD / Monitor_nD" bundle.

I would be grateful for any help.

Best wishes from the MLZ,

Andreas Ostermann


-- 
*Dr. Andreas Ostermann*
Instrument BIODIFF
Technical University of Munich
Forschungs-Neutronenquelle
Heinz Maier-Leibnitz (FRM II)
Lichtenbergstr. 1
85748 Garching
Germany
Tel.: +49 (0)89 289-14702


andreas.ostermann at frm2.tum.de
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