The `Pol_bender` Component

Polarising bender.

Identification

Author: Peter Christiansen
Origin: RISOE
Date: August 2006
Version: 1.2

Description

Based on Guide_curved written by Ross Stewart.
Models a rectangular curved guide tube with entrance centered on the Z axis.
The entrance lies in the X-Y plane.  Draws a true depiction
of the guide with multiple slits (but without spacers), and trajectories.
It relies on similar physics as the Monochromator_pol.
The reflec function 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)

The guide is asummed to have half a spacer on each side:
   slit1  slit2  slit3 
 |+     ++     ++     +|
 |+     ++     ++     +|  
 <---------------------> xw
 <------> xw/nslits (nslits=3)
        <> wspacer

The reflection functions and parameters defaults as follows:
Bot defaults to Top, Left defaults to Top, Right defaults to left.
Down defaults to down and up defaults to up for all functions and 
Top(Up and Down) defaults to StdReflecFunc and  {0.99,0.0219,6.07,2.0,0.003}

Example: 
Pol_bender(xw = 0.08, yh = 0.08, length = 1.0, radius= 10.0, 
	     nslits=5, wspacer=0.0, endFlat=0, drawOption=2,
	     rTopUpPar={0.99, 0.0219, 6.07, 3.0, 0.003},
	     rTopDownPar={0.99, 0.0219, 6.07, 1.0, 0.003})

See also the example instruments Test_Pol_Bender and 
Test_Pol_Bender_Vs_Guide_Curved (under tests).

%BUGS 
This component has been against tested Guide_curved and found to
give the same intensities. Gravity option has not been tested.

GRAVITY: YES (when gravity is along y-axis)
POLARISATION: YES

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
xw	m	Width at the guide entry
yh	m	Height at the guide entry
length	m	length of guide along center
radius	m	Radius of curvature of the guide (+:curve left/-:right)
G			9.8
rTopUpFunc	1	Top reflection function for spin up (q, par, reflecProb)	StdReflecFunc
rTopDownFunc	1	Top reflection function for spin down (q, par, reflecProb)	StdReflecFunc
rBotUpFunc			rTopUpFunc
rBotDownFunc			rTopDownFunc
rLeftUpFunc			rTopUpFunc
rLeftDownFunc			rTopDownFunc
rRightUpFunc			rLeftUpFunc
rRightDownFunc			rLeftDownFunc
rTopUpPar	1	Parameters for rTopUpFunc	{0.99
rTopDownPar	1	Parameters for rTopDownFunc	{0.99
rBotUpPar			rTopUpPar
rBotDownPar			rTopDownPar
rLeftUpPar			rTopUpPar
rLeftDownPar			rTopDownPar
rRightUpPar			rLeftUpPar
rRightDownPar			rLeftDownPar
nslits	1	Number of slits	1
wspacer	m	Width of spacers.	0.0
debug	1	if debug > 0 print out some internal parameters	0
endFlat	1	If endflat>0 then entrance and exit planes are parallel.	0
drawOption	1	1: fine(all slits/90 points per arc), 2: normal (max 20/40), 3: rough (max 5/10)	1

Output parameters

Name	Unit	Description
localG	m/s/s	Gravity vector in guide reference system
normTopBot
normIn
normOut
pointTop
pointBot
pointIn
pointOut
rTopUpParPtr
rTopDownParPtr
rBotUpParPtr
rBotDownParPtr
rLeftUpParPtr
rLeftDownParPtr
rRightUpParPtr
rRightDownParPtr

The Pol_bender Component

Identification

Description

Input parameters

Output parameters

Links

The `Pol_bender` Component