Dear All,
you can find the code to correct for the delayed helicity reporting in
my home directory under helcor_eg6 .
It can be compiled using the Makefile in the directory: the executable
is created locally and named helcor_Linux .
As I mentioned the code was intended to read both bosfiles and ntuples
(nt10) but I checked and it would not work on ntuple because some of the
helicity related variables the code is using are not presently saved in
the eg6 nt10. I tried it on bosfiles and it works. I'm presently
correcting for a delayed reporting of 8 cycles: can someone confirm that
this is correct?
When launched, the code asks for the bosfile names and as outputs it
creates a text file named hel_table.txt where the first 10 columns have
the relevant information. The meaning of these columns is the following:
1) Correction Flag: A.B
A= quartet number
B= state in the quartet (1,2,3,4)
> 0 if good quartet
< 0 if good quartet but missing scaler information
= 0 if bad quartet
2) First Event of Helicity state
3) Last Event of Helicity state
4) True Helicity as determined by this code
5) True Helicity as determined by Sergey code (now set to 2 because
the online code is not running)
6) Reported Helicity
7) Sync signal
8) Quartet signal
9) TGBI helicity Counter
10) Interrupt Time from microsec clock
The other columns are all set to 0 because apparently there are no
helicity scaler banks (HLS and HLB) in the bosfiles. I don't know if
this was meant to be.
Because the helicity scaler information are missing, the correction flag
is set to negative values (see above).
To apply the correction is sufficient to read the table and assign the
helicity written in column #4 to all the events with numbers between the
ones in column 2 and 3.
Helicity states for which the correction flag (column 1) is set to 0
should be disregard because either the information to get the correct
helicity was missing (last states of each file) or the quartet the state
belongs to is incomplete (first state of each file or before and after a
beam trip).
Best regards
Raffaella