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Define the transverse mesh size ,
number of bins, etc, for luminosity
calculation. One luminosity command is needed for each combination
of particles , e, e, right-going and left-going.
Thus, there can be at most 9 LUMINOSITY commands.
LUMINOSITY
KIND=(,),
[FREP=,]
[W=(,[,]),]
[E1=(,[,]),
E2=(,[,]),]
WX=([,]),
WY=([,]),
[HELICITY,]
;
- ,
- Particle species of right and left-going beams.
-
- Repetition frequency (Hz). Used for the luminosity
scale only. Default=1Hz.
- ,,
-
Parameters for differential luminosity
with respect
to the center-of-mass energy W.
(,) is the range in eV and
is the number of bins.
If (,) is not given, the
center-of-mass spectrum is not calculated.
Default for is 50.
- ,,,,,
-
2-D differential luminosity .
(, ) is the range in eV and
is the number of bins. (j=1 for
right-going beam and j=2 for left-going beam.)
Both or none of E1 and E2 have to be
specified. If none is specified, 2-D luminosity
is not calculated.
Default for is 50.
- ,
- Full horizontal/vertical width of the
mesh region (m). The origin is adjusted
automatically from time to time.
- ,
- Maximum width of the mesh region (m). If not given,
is used throughout. If given,
an increased size upto
is used when a significant particle fraction gets
out of the mesh region defined by .
The number of mesh points
is determined automatically.
- HELICITY
- Calculate luminosity for every combination of
helicity, (++), (-+), (+-), (-).
All the LUMINOSITY commands must have
the same value of ,,,,
and .
(Specify them at the first LUMINOSITY command.)
Note that the longitudinal mesh size, which is common to beam-beam
field and luminosity calculations, has to be defined by the
parameter Smesh by the SET command.
The luminosity is actually computed by the PUSH-ENDPUSH loop.
The calculated luminosity can be referred to by the following functions.
(If during the loop, the accumulated luminosity upto that moment is
returned.)
- Lum(,)
-
Luminosity of KIND=(,)
in units of cmsec.
- LumH(,,h)
-
Helicity luminosity :
helicity combination
(++) (h=1), (-+) (h=2), (+-) (h=3),
(-) (h=4). h=0 will give the total
luminosity Lum(,).
(cmsec)
- LumW(,,n)
-
Differential luminosity in the n-th bin.
(cmsec/bin)
- LumWbin(,,n)
-
Bin center (eV) of the n-th bin. If n=0,
the number
of bins is returned. (Error if n<0 or n is
larger than the number of bins.)
- LumWH(,,n,h)
-
Differential helicity luminosity.
(cmsec/bin)
- LumEE(,,,)
-
2-D differential luminosity
for the bin (,).
(cmsec/bin)
- LumEEbin(,,l,n)
-
Bin center (eV) of the n-th bin of (l=1)
or (l=2). If n=0, the number
of bins is returned. (Error if n<0 or n is
larger than the number of bins.)
- LumEEH(,,,,h)
-
2-D differential helicity luminosity
These functions can be included in expressions.
Thus, you can write the computed luminosity on a file.
In particular, the only way to retrieve the 2-D luminosity
is to use the above functions because
PLOT LUMINOSITY command cannot plot it (KEK TopDrawer
cannot draw 3-D plot). So, for example, to write ee
luminosity,
S ET m1=LumEEbin(2,3,1,0), m2=LumEEbin(2,3,2,0);
W RITE ((LumEE(2,3,n1,n2),n1=1,m1),n2=1,m2),
F ORMAT=();
Next: PPINT
Up: Commands
Previous: EXTERNALFIELD
Toshiaki Tauchi
Thu Dec 3 17:27:26 JST 1998