[ Identification | Description | Input parameters | Links ]

The `SNS_ARCS` Instrument

Model of the ARCS spectrometer from SNS.

Identification

Site: SNS
Author: G. Granroth
Origin: SNS
Date: Nov 2014

Description

When using this ARCS instrument model, please reference

Granroth, G. E. and Abernathy, D. L., "Performance Comparisons of Four Direct Geometry
Spectrometers Planned for Spallation Neutron Source",  Proceedings of ICANS-XVI, 289 (2003).
D. L. Abernathy,  M. B. Stone,  M. J. Loguillo, M. S. Lucas, O. Delaire, X.Tang, J. Y. Y. Lin, and
B. Fultz,"Design and operation of the wide angular-range chopper spectrometer ARCS at the
Spallation Neutron Source", Review of Scientific Instruments, 83 , 015114 (2012)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
Fermi_nu	Hz	Frequency of the Fermi chopper	420
T0_nu	Hz	Frequency of the T0 chopper	90
nrad	m	Radius of the Fermi chopper blades	0.58
nchans	1	Number of channels in the Fermi chopper	40
Edes	meV	Desired/target energy	50
Et	meV	Energy transfer of the Spot_sample	25
ttheta	deg	Scattering angle of the Spot_sample	25
T0_off			0
sxmin	m	Sample slit horz min value	-0.04
sxmax	m	Sample slit horz max value	0.04
symin	m	Sample slit vert min value	-0.04
symax	m	Sample slit vert max value	0.04
run_num	1	Virtual source run number (unused at present)	1

The SNS_ARCS Instrument

Identification

Description

Input parameters

Links

The `SNS_ARCS` Instrument