[ Identification | Description | Input parameters | Links ]

The Elliptic_guide_gravity Component

Identification

• Author: Henrik Bo Hoffmann Carlsen and Mads Bertelsen
• Origin: NBI
• Date: 27 Aug 2012

Description

The Elliptic_guide_gravity component models a true elliptic guide, with separate
ellipses in the vertical (top/bottom) and horizontal (left/right) directions,
allowing gravity to be simulated.

The guide is centered along the z-axis, with entry and exit planes parallel to the
xy-plane. The guide entry is at z=0 (in line with other guide components).
By default, the ellipses are defined by specifying their focal points as
distances from the guide entry (linxw, loutxw, linyh, loutyh). In addition,
it is possible to directly define the ellipse through the parameter set:
majorAxisxw, minorAxisxw, majorAxisyh, minorAxisyh, together with
majorAxisoffsetxw and majorAxisoffsetyh, where the offset parameters place the
ellipse centers respectively.
Further, it is possible to approximate the ellipses through parabolas, or as
half ellipses.

m-values for the guides may be specified independently for each of the four walls,
as a scalar value for the entire wall, or as a vector distributing the m-values
evenly (seglength left unset) or according to the vector seglength.

Example 1, Elliptical definition using focal points:

Elliptic_guide_gravity(
l=50,
linxw=5,linyh=5,loutxw=10,loutyh=10,
xwidth=0.05,yheight=0.05,
R0=0.99,Qc=0.0219,alpha=6.07,m=1.0,W=0.003
)

Example 2: Half elliptical definition:

Elliptic_guide_gravity(
l=50,
linxw=5,linyh=5,loutxw=10,loutyh=10,
xwidth=0.1,yheight=0.1,
R0=0.99,Qc=0.0219,alpha=6.07,m=1.0,W=0.003,
option = "halfEllipse",
dimensionsAt = "entrance"
)

Example 3: Parabolic approximation:

Elliptic_guide_gravity(
l=50,
linxw=5,linyh=5,loutxw=1e6,loutyh=1e6, // values larger than 1e8 may cause erroneous results
xwidth=0.1,yheight=0.1,
R0 = 0.99,Qc=0.0219,alpha=6.07,m=1.0,W=0.003,
dimensionsAt = "exit"
)

Example 4: Elliptical definition with varying m-values:

Elliptic_guide_gravity(
l=50,
linxw=5,linyh=5,loutxw=10,loutyh=10,
xwidth=0.1,yheight=0.1,
R0 = 0.99,Qc=0.0219,alpha=6.07,m=1.0,W=0.003,
mvaluesright=marray,mvaluesleft=marray,mvaluestop=marray,mvaluesbottom=marray
)

where marray is initialized as
for(iter=0; iter < 50; iter++){ marray[iter] = 2; }
And Declared as
double mValues[50];
If you are using the array-based coating-specification, you **must** give nSegments a compatible value.

Input parameters

Links

• Source code for Elliptic_guide_gravity.comp.

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