The Fermi_chop2a McStas Component

SNS Fermi Chopper as used in SNS_ARCS

Models an SNS Fermi Chopper, used in the SNS_ARCS instrument model.

Parameters in boldface are required; the others are optional.


Name	Unit	Description	Default



len	m	slit package length
w	m	slit package width
nu	Hz	frequency
delta	sec	time from edge of chopper to center Phase angle
tc	sec	time when desired neutron is at the center of the chopper
ymin	m	Lower y bound
ymax	m	Upper y bound
nchan	1	number of channels in chopper
bw	m	blade width
blader	m	blade radius