Vanadium Sample

[Stephan Roth]

Dear Sir,

I am using McStas for the construction of a disc chopper time-of-flight
spectrometer of IN5-type. Especially I want to simulate angular resolved
time-of-flight spectra at the detector bank. That is I want to see the
influence of the finite diameter of cylinder samples on the spectra at
several scattering angles. So I want to use a focusing option like in
V_sample.comp, but the focusing should be on a rectangular detector.
So I first made a setup of IN5-type with a Ni-guide, a V-sample and a
realistic secondary flight path of 4m, in order to take a look the angular
spectrum at a scattering angle of 90degree (without tof-detector). 
But a detector placed at the focusing point counts no neutrons.
Hence I would like to ask you, if you could help me finding the mistake in
the setup (I have incorporated the in5.instr file in this mail). 

Thank you in advance for your help.

Best regards
Stephan Roth

 
      _/_/_/_/    _/_/  _/_/_/_/ Stephan V. Roth
     _/         _/ _/  _/    _/  Technische Universitaet Muenchen
    _/        _/  _/        _/   Physik-Department Lehrstuhl E13
   _/_/_/        _/     _/_/     James-Franck-Str. 1
  _/            _/        _/     85748 Garching
 _/            _/  _/    _/      Tel.: +49 (0)89-289-12883
_/_/_/_/      _/  _/_/_/_/       Fax : +49 (0)89-289-12473


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DEFINE INSTRUMENT detektest()

TRACE 
COMPONENT arm = Arm() AT (0,0,0) ABSOLUTE

COMPONENT source = Source_div(width=.02,height=.05,hdiv=.702,vdiv=.702,E0=2.2722,dE=.001)
	AT (0,0,0) RELATIVE arm

COMPONENT guide = Guide(w1=.02,h1=0.05,w2=.02,h2=0.05,l=53,R0=0.995,
			Qc=.0214,alpha=5.566,m=1,W=.0033)
	AT (0,0,0.001) RELATIVE source

COMPONENT detector1=Monitor(xmin=-.1,xmax=.1,ymin=-.2,ymax=.2)
	AT (0,0,0.2) RELATIVE guide

COMPONENT sample1=V_sample(radius_i=.0143,radius_o=.0148,h=.05,pack=1,focus_r=.1,
				target_x=4,target_y=0,target_z=0)
 AT (0,0,.205) RELATIVE guide

/*
COMPONENT slit_det=Circular_slit(radius=.1)
 AT (4.000,0,0) RELATIVE sample1
*/

COMPONENT detector1f=Monitor(xmin=-.2,xmax=.2,ymin=-.2,ymax=.2)
 AT (4,0,0) RELATIVE sample1

END