## 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.