[ Identification | Description | Input parameters | Output parameters | Links ]

The Pol_mirror Component

Polarising mirror.

Identification

Description

This component models a rectangular infinitely thin mirror.
For an unrotated component, the mirror surface lies in the Y-Z
plane (ie. parallel to the beam).
It relies on similar physics as the Monochromator_pol.
The reflec function (see e.g. share/ref-lib for examples) and parameters 
are passed to this component to give a bigger freedom. 
The up direction is hardcoded to be along the y-axis (0, 1, 0)
For now we assume:
P(Transmit|Q) = 1 - P(Reflect|Q)
i.e. NO ABSORPTION!

There are 3 options:
1) Reflect and transmit (randomly choose) [default]
2) Only reflect (reduce weight)
3) Only transmit (reduce weight)

The parameters can either be 
double pointer initializations (e.g. {1.0, 0.0219, 6.07, 2.0, 0.003}) 
or table names (e.g."supermirror_m2.rfl" AND useTables=1).
NB! This might cause warnings by the compiler that can be ignored.

Examples:
Reflection function parametrization 
Pol_mirror(zw = 0.40, yh = 0.40, option=1,
	     rUpFunc=StdReflecFunc, rUpPar={1.0, 0.0219, 6.07, 2.0, 0.003})

Table function 
Pol_mirror(zw = 0.40, yh = 0.40, option=2, 
	     rUpFunc=TableReflecFunc, rUpPar="supermirror_m2.rfl",
	     rDownFunc=TableReflecFunc, rDownPar="supermirror_m3.rfl", 
	     useTables=1)

See also the example instrument Test_Pol_Mirror (under tests).  

GRAVITY: YES
POLARISATION: YES

%BUGS 
NO ABSORPTION

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
rUpFunc 1 Reflection function for spin up (q, *par, *r) StdReflecFunc
rDownFunc 1 Reflection function for spin down (q, *par, *r) rUpFunc
rUpPar 1 Parameters for rUpFunc {0.99
rDownPar 1 Parameters for rDownFunc rUpPar
useTables 1 Parameters are 0: Values, 1: Table names 0
zw m Width of the mirror  
yh m Height of the mirror  
option 1 1:Reflect/trasmit, 2:Reflect only, 3:Transmit only 1

Output parameters

Name Unit Description Default
rUpParPtr  
rDownParPtr  

Links


[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Thu Mar 15 18:49:41 2012