[ Identification | Description | Input parameters | Links ]

The ISIS_moderator Component

ISIS Moderators

Identification

• Site:
• Author: S. Ansell and D. Champion
• Origin: ISIS
• Date: AUGUST 2005

Description

Produces a TS1 or TS2 ISIS moderator distribution.  The Face argument determines which moderator
is to be sampled. Each face uses a different Etable file (the location of which is determined by
the MCTABLES environment variable).  Neutrons are created having a range of energies
determined by the Emin and Emax arguments.  Trajectories are produced such that they pass
through the moderator face (defined by modXsixe and yheight) and a focusing rectangle
(defined by xh,focus_yh and dist).  Please download the documentation for precise instructions for use.

Example:   ISIS_moderator(Face ="water", Emin = 49.0,Emax = 51.0, dist = 1.0, focus_xw = 0.01,
focus_yh = 0.01, xwidth = 0.074, yheight = 0.074, CAngle = 0.0,SAC= 1)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
Face	word	Name of the face - TS2=groove,hydrogen,narrow,broad -	"hydrogen"
Emin	meV	Lower edge of energy distribution	49.0
Emax	meV	Upper edge of energy distribution	51.0
dist	m	Distance from source to the focusing rectangle	1.0
focus_xw	m	Width of focusing rectangle	0.01
focus_yh	m	Height of focusing rectangle	0.01
xwidth	m	Moderator vertical size	0.074
yheight	m	Moderator Horizontal size	0.074
CAngle	radians	Angle from the centre line	0.0
SAC	boolean	Apply solid angle correction or not (1/0)	1
Lmin	meV	Lower edge of wavelength distribution	0
Lmax	meV	Upper edge of wavelength distribution	0
target_index	1	relative index of component to focus at, e.g. next is +1	+1
verbose	boolean	Echo status information at everu 1e5'th neutron	0

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for ISIS_moderator.comp.
• Further information should be
• downloaded from the ISIS MC website.
• *******************************************************************************/

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[ Identification | Description | Input parameters | Links ]

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST