From: Peter H. L. Christiansen (pchristi@nbi.dk)
Date: Thu Feb 06 2003 - 08:57:56 EST
Hi I just wanted to mention that I did a test with more settings and found that there is pt-scaling except for the runs where the MRS was moved back. The results can be checked at : http://www.nbi.dk/~pchristi/BRAHMS/TOF/ Cheers Peter On Thu, 6 Feb 2003, Peter H. L. Christiansen wrote: > Hi > > There is somehow two ways to interpret the results. > > 1) The pointing is worse at large angles in TPM2 so therefore it is also > worse at low momentum > 2) The efficiency is worse at low momentum therefore the efficiency is > also worse at large TPM2 angles > > The way I understand the results is that it is the last point that is true > becuase the efficiency seems to be the same in all settings if you look as > a function of momentum while the angle dependence differs quite a lot. > This also explains why the efficiency is lower in low field settings even > though there are actual more straight tracks than in high field settings. > If there is a monetum dependence it might be the result of multiple > scattering or the energy deposited in the slat and will likely be > different for different particle species (masses). > > Cheers > Peter > > P.s : I am gonna try to run some more settings and see if they agree with > what I shown so far. > > On Thu, 6 Feb 2003, Djamel Ouerdane wrote: > > > HI, > > > > I think the large alpha_x ineffiency is more due to the fact that the > > matching tof-track is worse since it involves slats from outer panels more > > (I'm not talking about the panels Peter has removed on purpose). > > The matching in the x direction of each panel is better for middle > > panels. In the y direction, this behaviour is even worse. Since the y > > matching relies on the slat speed of light calibration, it is much better > > in the middle panels where most of the tracks point to. > > > > Djam > > > > Djamel Ouerdane ------------------------------------------o > > | Niels Bohr Institute | Home: | > > | Blegdamsvej 17, DK-2100 Ø | Jagtvej 141 2D, | > > | Fax: +45 35 32 50 16 | DK-2200 Copenhagen N | > > | Tel: +45 35 32 52 69 | +45 35 86 19 74 | > > | http://www.nbi.dk/~ouerdane | > > | ouerdane@nbi.dk | > > o---------------------------------------------------------o > > > > > > -- :-) --------------------------- )-: Peter H L Christiansen @ NBI EMAIL : pchristi@nbi.dk OFFICE : Tb1@NBI (353 25269) HOME : Vesterbrogade 204, 2. th PHONE : 40840492(mob.) :-D --------------------------- \-:
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