Creation of the q-vector list

The first step is to create a list of reflections to be used for the averaging of the powder neutron cross section.

just type: powdermagnon 0.3 2 0.1 80

meaning take file mcphas.j, generate a reflection list and put it to file mcdisp.par. Parameters in the above command are

• 0.3 ....qmin [1/A] minimal q vector
• 2 ....qmax [1/A] maximal q vector
• 0.1 ....deltaq [1/A] step width in q
• 80 ....number of steps in polar coordinate $\Theta$ (steps in polar angle $\phi$ are then calculated in module powdermagnon by $\delta \phi= \delta \Theta*\pi/(4*sin(\Theta))$