NEW 14-08-00: DSTs available for runs 400-820
NOTE Only 2X2 telescope planes were available in May during the low intensity run. During the high intensity run, these were too slow and data was taken "binary only". As for the second period only analyses using the other DUTs as reference are possible, it was decided not to produce DSTs for these. For the first period DSTs are available on HPSS (run nos 400 to 820). With only 2 XY points track reconstruction becomes rather ambiguous (although the algorithm does try to find the least divergent tracks). Therefore, it is advised to select only "good tracks", by placing a cut on the divergence as explained on Gabriela's page.
NOTE The residual inefficiency due to corrupted events, detectors systems out-of-synch and all that we do not know about can be decreased by requiering a reference modules to be efficient. The OK-flag in the DSTs is "1" for events with one single reconstructed track, where at least one of the anchor planes was efficient.
Modules present:
NOTE Although in June 4X2 telescope planes were read out, some of them had rather low efficiency, that varied in time. In order to get a decent number of reconstructed tracks, the requiered minimum number of space point defining a track had to be lowered to 2. This leads to the same problems as in the May alignment. The same solution applies, see Gabriela's page.
NOTE The meaning of the OK-flag in this case is similar to May, but now the requierement is that either of the two anchor planes or the two planes of the reference module (RLK6) be efficient.
Modules present can be found in the official list on the SCT testbeam web pages.
NOTE The OK-flag has now evolved into a slightly more elaborate problem indicator. Events with OK-flag "1" are still the only ones to be trusted, but the "bad" events are broken down in categories:
Most of these should hardly ever occur, except maybe for the Binary Hit buffer overflow, when running at low threshold.NEW 23/11/00 a new run of DSTs has finally been processed. They can be found under /hpss/cern.ch/atlas/testbeam/sct/2000/dst_v1/
The number of events with one track has increased considerably. The tracks object will now contain one additional variable: the chi squared of the fit of the telescope points. This allows to select a sample of a certain size/quality.
NEW 30/10/00 The summary Ntuple is now available. It contains efficiencies, noise and some other essential results for all DUTs and all runs. Some explanation and the ROOT binary file can be found here
Six modules were in the KEK test beam:
Two bias scans were taken (denominated run I and II). The main difference between the two is the presence of the irradiated KEK module in the second and the different shaper bias current.
More details will appear on these pages and the SCT and KEK beam test pages. KEK test beam pages SCT testbeam web pages.
DSTs have been produced for the second bias scan taken at KEK. They are available under /hpss/cern.ch/atlas/testbeam/sct/2000/dst_v1 with names dst[run number].root The alignment is done in a very similar way to that in H8, although the beam is much lower energy at KEK. Details can be found on the alignment page
22-12-2000 DSTs are available for run II.
old DST format (from Bill Murray's original documentation)
Last update July 12, 2000