Dernière mise à jour : mercredi 7 mars 2007, par
The first four prototype SSD modules corresponding to the final design were tested using a secondary 7 GeV/c pion beam produced at the CERN PS accelerator.
|Module Number||Median strip noise, electrons||S/N ratio|
The low S/N ratio for module 1 and 2 is due to higher noise on the N-side of these modules (the problem has been solved by the manufacturer).
After modules alignment, 3 modules are taken as reference and the dispersion of the track residuals on the fourth module gives the spatial resolution. As there is no additional reference detector, resolutions found are higher than the nominal ones (20um in rphi direction and 820um along z) and are worse for outer modules (1 and 4).
|resolution in rphi(µm)||resolution in z(µm)|
For more details about these results see ALICE note ALICE-INT-2005-028 (Approved-Collab.) or contact Stephane Plumeri ().
A more complete analysis will be available soon in a NIM paper.