please let's have some decent threads on analysis issues. The subject
lines are for the topics below.
Also, if you are lost on shift, start with the blast book. There is
general information there that could be useful also for you.
_ There was again a call for knowing what cuts to use for the CC
efficiency. Note, CC efficiency is not a project to take home, but
something we need online to plan the next shifts. See my next email
The goal is to understand what is the working point of the CC with field
on, that affects their ADC spectra (cc_eff vs Hv, threshold)
_ L/R at some point we will analyze data with field on. JS has done some
work with field off using show_protons.C and tuning Cuts.C. But this
was also done ("by hand") before the collaboration meeting. To really
make progress on this, we want tdc offsets
_ TDC offsets: peter could not attend but his progress is noticeable.
Basically the macro works. It "measures" the tof lenght (in tdc
channels) rather than assuming it. This was a good choice, as indeed the
Wch cuts into the edges of the tof acceptance. So we don't get data all
over the tofs. PK, I would cut close to 90% of the mean or the
"flat" region (not at 50%) to avoid counting particles straggling in.
I would cut more into the elastic protons (ttl-ttr, ttr-ttl)
Expect results for end of the week. Needs feedback to other SCrecon
"handlers".
* Just to clarify the analysis structure. The ADC and TDC offset
subtraction is done in the reconstruction. So it does not depend on
ntuples. When TDC's are in we will move to commis/phase3. Note, between
phase2 and phase3 only the cuts in the macros really change, as they
assumed offset subtracted data in the ntuples
* Ntuple size: for the "raw" ntuple (all hits retianed) we can only have
tof's and cc's. The NC will be on a separate raw ntuple. A switch would
be nice so as to speed up analysis if this is slowed down by the NC
(when?). There is no problem with the eep ntuple (data reduction)
Adrian will be testing the NC e-map/ntuple today.
* We will not start using trees,branches during commissioning.
that's a shut down project.
_ CC has prepared some info on the various options for init.C, how it
uses Cuts.C.
Soon there will be a summary of the commis/phaseX analysis structure.
Ask fellow shift-takers. THat is the best way to get information. You
don't have to be a root guru to do analysis
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:28 EST