Reflectometry Testing
Wiki > Project overview > Design documents > Reflectometers > Reflectometry Testing
This is a record of some of the things I have tried and done on CRISP in Feb 2019.
Scan in sample and align beam in SECI.
Copy scan.py from LOQ to CRISP to allow in IBEX plotting. Sort out a crisp package and alter the init so that it loads it.
Issue I can not see how to reload my changed code while developing my scan except to restart the scripting window (which is non-ideal).
Ideally, this code should be in crisp_inst.py but I haven't put it there yet this is to load in the scanning library:
from general.Scans.Scans import *
After the final align of the beam you should perform a theta scan to ensure that the beam is aligned.
scan("THETA", -0.05, 0.05, count=21, frames=100, fit=Gaussian)
which produces 
.
After aligning with the laser:
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Perform a shadow scan (this is only possible if your sample absorbs/scatters neutrons silicon does not). I could not do this with the sample I has.
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Perform a shallow bounce scan. Set theta to a small angle (0.25) then tilt phi to find the peak in intensity. Start with widish slits otherwise you will not see anything. Command is
scan("PHI", 0.22, 0.28, count=21, frames=200)