Alignment errors are defined by the statement
SELECT,FLAG=ERROR,RANGE=range,CLASS=name,PATTERN=string;
EALIGN, DX=real,DY=real,DS=real,
DPHI=real,DTHETA=real,DPSI=real,
MREX=real,MREY=real,
MSCALX=real,MSCALY=real,
AREX=real,AREY=real;
and elements are now selected by the SELECT command.
The attributes are:
DX:
The misalignment in the x-direction
for the entry of the beam element (default: 0 m).
DX>0 displaces the element in the positive x-direction
DY:
The misalignment in the y-direction
for the entry of the beam element (default: 0 m).
DY>0 displaces the element in the positive y-direction
DS:
The misalignment in the s-direction
for the entry of the beam element (default: 0 m).
DS>0 displaces the element in the positive s-direction
DPHI:
The rotation around the x-axis.
A positive angle gives a greater x-coordinate for the exit
than for the entry (default: 0 rad).
DTHETA: The rotation around the y-axis according to the right hand rule (default: 0 rad).
DPSI: The rotation around the s-axis according to the right hand rule (default: 0 rad).
MREX:
The horizontal read error for a monitor.
This is ignored if the element is not a monitor
If MREX>0 the reading for x is too high (default: 0 m).
MREY:
The vertical read error for a monitor.
This is ignored if the element is not a monitor
If MREY>0, the reading for y is too high (default: 0 m).
AREX:
The misalignment in the x-direction
for the entry of an aperture limit (default: 0 m).
AREX>0 displaces the element in the positive x-direction
AREY:
The misalignment in the y-direction
for the entry of an aperture limit (default: 0 m).
AREY>0 displaces the element in the positive y-direction
MSCALX:
The relative horizontal scaling error for a monitor.
This is ignored if the element is not a monitor.
If MSCALX>0 the reading for x is too high (default: 0).
A value of 0.5 implies the actual reading is multiplied by 1.5.
MSCALY:
The relative vertical scaling error for a monitor.
This is ignored if the element is not a monitor.
If MSCALY>0 the reading for y is too high (default: 0).
A value of -0.3 implies the actual reading is multiplied by 0.7.
Example:
SELECT,FLAG=ERROR,CLASS=MQ;
EALIGN,DX=0.002,DY=0.0004*RANF(),DPHI=0.0002*GAUSS();
Assigns alignment errors to all elements of class MQ.
SELECT,FLAG=ERROR,PATTERN="QF.*";
EALIGN,DX=0.001*TGAUSS(2.5),DY=0.0001*RANF();
Assigns alignment errors to all elements starting with "QF".
TGAUSS(2.5) means a Gaussian distribution cut at 2.5 sigma.
Figure 1: Example of Misplacement in the (x, s)-plane.
Figure 2: Example of Misplacement in the (x, y)-plane.
Figure 3: Example of Misplacement in the (y, s)-plane.
Figure 4: Example of Read Errors in a monitor