Taken from forum postings by Dave Gill, Nov/Dec 2003.
https://twist.phys.ualberta.ca/forum/view.php?bn=twist_software&key=1067729490
https://twist.phys.ualberta.ca/forum/view.php?bn=twist_software&key=1070946559

1 November 2003:

I added the muon beam data files postOct23_950_mu.dat and postOct23_940_mu.dat
to $CAL_DB/

To run GEANT using this data you will need to add
setenv MU_BEAM $CAL_DB/postOct23_950_mu.dat
to your e614.com file.

You will aslo need to change the PGUN and MSOR cards in your ffcards file to
look like:
PGUN 65  2
0. 0. -154.0 0. 0. 0. 0.5 0.5 0. 0.9 0.9 29.6 1.007
0. 0. -134.0 0. 0. 0. 1.15 0.77 0. 0.9 0.9 29.6 1.007
MSOR 4 1
-295.0 0. 13. 15. 0. 0. -0.009 -0.009 1.
-295.0 0. 15. 18. 0. 0. -0.009 -0.009 1.

The MSOR = 4 activates the read_beam_props and tells gukine to use the info
read from the beam properties data files. Modify the IMSOR comments as
follows:
C     IMSOR    = Use-Flag: any positive integer to use [1]
C                    =1 : uniform direction into rectangular aperture, 
C                         gaussian beam spot from PGUN.
C                    =2 : gaussian distributed direction, 
C                         gaussian beam spot from PGUN.
C                    =3 : direction in combo with vertex(not at focus),
C                         position and direction are correlated.
C                    =4 : read in beam properties and employ,
C                         requires z position of Particle Gun == z where 
C                         the measurements were made (see PGUN card).

For IMSOR = 4 all the beam parameters on the corresponding PGUN and MSOR cards
are ignored except for the Particle Gun  z position, the beam momentum and its
resolution, the MSOR z position and the surface muon yse/no definition.

The chamber that determined the beam parameters in the .dat files was at -154
cm from the stopping target.

The new Jaap Doornbos tune calls for the focus to be at ~-134cm so that is why
I set the e+ beam PGUN z at -134.


8 December 2003:

I just put the file,

  surface_tune_03.dat 

in $CAL_DB. It contains the data that charaterizes the 29.6MeV/c
surface muon beam we have just used for the Al stopping target
data. If everything scales as it should this file can also be used to
characterize the 28.9MeV/c surface beam, i.e. it should be used for MC
generation of the any surface beam used this year.

Use it in exactly the same way as those previously posted for the fall
2002 beams, i.e. put the following line in your .com file, setenv
MU_BEAM $CAL_DB/surface_tune_03.dat