Hi Flemming, What does that imply for all the simulations done so far ? I remember having seen this GSAHIT message billions of times in the FS simulations. Are the cdat files created so far for the FS good enough ? Djam On Thu, 4 Jul 2002, Flemming Videbaek wrote: > Djam observed and reported a problem in the acceptance calculation using brag for 30 deg. That hits in T2 looked strange. > I checked it this morning and observed that geant gave an error message when being run > > ***** GSAHIT OVERFLOW WHEN IUSET= T2 IUDET= T2PR HITS( 1)=-0.4113410E+03 ORIG= 0.4000000E+03 FACT= 0.1000000E+04 > ***** GSAHIT OVERFLOW WHEN IUSET= T2 IUDET= T2PR HITS( 4)=-0.4129992E+03 ORIG= 0.4000000E+03 FACT= 0.1000000E+04 > > This is the clue - the global xhits are more negative than the orgin for the hit in that variable. Since hits are stored (global) inside > geant as hitval= (x + origin)*fact as integer the wrong global value is stored. > > See the cern geant web pages fro more on hits (and nearby pages) > http://wwwinfo.cern.ch/asdoc/geant_html3/node148.html > > The origins for t2,tof2, c1 as well for t3,t4 t5 were changed and commited (FFS up to 30 deg BFS to~20deg - which it cannot do physically) > The version is now 1.1.14 and has been installed in opt/brahms/new. > > Lesson to be learned > a) Though much of BRAG has been extensively tested there can still be problems > b) In case of problems check log-output for possible errors that might be a clue. > c) As was done- communicate problems > > > > Thanks to Pawel for posting tracking effeciencies for the FS. > > This bring up a point- I would think that part of the effeciencies say determined for T1 (and T1) is due to > bad and non-instrumented pads. If this is the case I think it is --incorrect -- in the geometric acceptance to > take into account dead and non instrumented pads as I believe it is done in the BrGeanToTpcTrackCandidate. > If so we should either change the geometric acceptance-calculation, or take the effect of of the 'experimental > tracking eff' which seems at best difficult. > > Comments to this? > > > regards from a hot and steamy Long Island > > Flemming > > > > ------------------------------------------------------ > Flemming Videbaek > Physics Department > Brookhaven National Laboratory > > tlf: 631-344-4106 > fax 631-344-1334 > e-mail: videbaek@bnl.gov > -- 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
This archive was generated by hypermail 2b30 : Thu Jul 04 2002 - 11:24:29 EDT