Exercise: Insert a different sample

  1. Next, let us insert something more interesting. Remove the V_sample and PSD_monitor_4PI_log. Insert a PowderN component with the following parameters:
    COMPONENT sample = PowderN(radius=0.01,h=0.01, d_phi0=0.1, pack=0.5, 
       DW=0.9, frac=0.5, focus_r=0.03, reflections="mylist.dat",
       Vc=3.86*3.86*11.82, sigma_abs=0, sigma_inc=2, barns=1)
      AT (0, 0, 0) RELATIVE a4
    
    You should also create a list of reflections, e.g. mylist.dat with the following contents:
    # column_j 3 multiplicity 'j'
    # column_q 1  Scattering vector modulus [Angs^-1]
    # column_F2 2 Scattering factor |F^2| in [barns]
    1 1000 8
    1.3 1000 4
    

    (Adjust placement relative to your component naming etc.). Also insert a banana shaped detector,

    COMPONENT ND = Monitor_nD(xwidth=1, options="banana, theta limits=[-45 45],auto y")
      AT (0,0,0) RELATIVE a5
    
    and take away the previously inserted Beamstop. Test that neutrons reach the detector, then run a long simulation (many neutron rays) and have coffee.


root 2010-07-15