GLAST Calorimeter Software Weekly Reports
Week of 26 January 2004

NRL

Sasha:  this week I managed to get all necessary software to study the CAL energy resolution problem: I will compare the results of simulation with GlastRelease v3r3p7 and Gleam v4r1 (released in October 2002). I made clean check out for both of them and after some fighting with old versions of external libraries managed to compile both. Now I am starting to simulate the event samples by these two packages and see what is the difference.

Andrey:  Continuation of last week.

Mark:  Admin tasks.

LLR

Pol:  Pending

Berrie:  I have found out by using different attenuation lengths for the CDEs what the cut in Qrat should be ( see previous presentation) as a function of the attenuation length in a CDE. It would make more sense to test this cut in a beamtest than in a MC, but anyway... The day we'll have a variety of attn lengths in the simulation I should be able to deal with them now...

Bordeaux

Benoit, Johan:  We have performed the second iteration concerning the energy calibration for the minical detectors.  The relative calibration of all crystals now agree within a few percent (less than 3 for most). The only open issue regards the absolute calibration: the measured energy deposits for light ions ( Z<10) are about 10% greater than the calculated ones, the energy calibration being taken from the energy deposit for the protons. The latter has been checked with gammas from a 22Ne radioactive sources. The agreement is excellent (discrepancy less than 3%). Further investigation is needed.

Thierry:  Things are going on on the JQMD task.  At the zero order the behavior looks good for low (100 MeV/u) energy heavy ions (not interesting for us but fast to compute).  Things look weird for 1 GeV/u...  We keep investigating with for sure results next week !!!

Montpellier

Agnieszka and Frederic: many administrative tasks

- writing GAM 2000-2003 activity report in view of its forthcoming regular examination by 2 committees (IN2P3 + 1 inter-disciplinary committee)

- filling in forms and describing GAM project in GLAST for a post-doc demand beginning september 2004

- Friday : 1 day dedicated to the future Physics Institute in Montpellier, in which GAM is foreseen to merge with the LPMT (theoretical physics lab).

Frederic: GSI EM data analysis -- Pedestals have been re-evaluated using no-beam data (trigger on noise). Looked in details at proton and alpha LEX8 data which exhibit wider peaks than in G4 simulation (MC). Fitting MC peaks after convolution with gaussian "noise" and comparing with data fits. Some problems still have to be fixed (tails in distributions, background under peaks). Intercalibration and non-linearities studies foreseen this week.

Agnieszka & Eric: FRS calibration -- Z & A measurements by MUSIC show variations from run to run. A set of control plots (Z, A, direction) has been defined. Corrections will be provided this week for an EM-FRS combined analysis, either directly in the event-builder code or using some more raw data to add in the FRS branch of ROOT trees.

SLAC

Xin:  Pending