The `ISIS_moderator` Component

ISIS Moderators

Identification

Author: S. Ansell and D. Champion
Origin: ISIS
Date: AUGUST 2005
Version: 1.11

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 E0 and E1 arguments.  Trajectories are produced such that they pass
through the moderator face (defined by modXsixe and modYsize) and a focusing rectangle
(defined by xh,yh and dist).  Please download the documentation for precise instructions for use.

Example:   ISIS_moderator(Face ="water", E0 = 49.0,E1 = 51.0, dist = 1.0, xw = 0.01,
   yh = 0.01, modXsize = 0.074, modYsize = 0.074, CAngle = 0.0,SAC= 1)

WARNING: This is a contributed Component.

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 - - TS1:Water,ch4,h2,merlin or instrument name eg maps, crisp etc. - TS2: W1-9 E1-9	"hydrogen"
E0	meV	Lower edge of energy distribution	49.0
E1	meV	Upper edge of energy distribution	51.0
dist	m	Distance from source to the focusing rectangle	1.0
xw	m	Width of focusing rectangle	0.01
yh	m	Height of focusing rectangle	0.01
modXsize	m	Moderator vertical size	0.074
modYsize	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 this is used to compute 'dist' automatically.	+1

The ISIS_moderator Component

Identification

Description

Input parameters

Links

The `ISIS_moderator` Component