1 / 11

FTPC Performance

FTPC Performance. Electronics Evolution Performance & Operational Parameters Summary. Frank Simon, MPI Munich, Germany. FTPC Review, July 19, 2004. Outline. Evolution of Electronics: 2003. There seems to be a more or less constant rate of failures Failed RDO board on East after day 70

hyman
Télécharger la présentation

FTPC Performance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. FTPC Performance Electronics Evolution Performance & Operational Parameters Summary Frank Simon, MPI Munich, Germany FTPC Review, July 19, 2004 Outline

  2. Evolution of Electronics: 2003 • There seems to be a more or less constant rate of failures • Failed RDO board on East after day 70 • Several blown fuses due to discharges in pp run

  3. Exchange of Electronics after d+Au run • FEE cards with more than 8 bad pads are exchanged • About 50 cards exchanged • Work takes approx. 2 days per detector • Cards have been repaired at MPI • Problem: Running out of spare chips at some point, but • Usually only one chip bad per FEE • Can chips be re-used?

  4. Electronics in 2004 • Significant changes during the run, especially through the loss of fuses -> Need better protection of the FEEs from discharges • Gain was reduced to limit the risks of further losses Day 15 Day 24 Day 53 Day 67 Day 78 Day 86

  5. Effect of Anode Voltage on Efficiency • Increase by 50 V increases efficiency significantly • Efficiency might be recovered partially at lower gain by tuning hit finding, was done for 2001 Au+Au

  6. Spatial Resolution • Residuals vs anode voltage for d+Au (similar for Au+Au 2004) • Big improvement by fixing grounding problem for d+Au run • Small improvement with voltage increase

  7. Charge • The Max ADC shows the dependence of the gain on the voltage, 50 V increase -> factor 2 in gain

  8. Two-Track Resolution • Results from the AuAu 2001 run

  9. Efficiency from Embedding • High efficiency in d+Au (insensitive areas included in the plot) • Drop of efficiency with multiplicity, tuning of parameters might help d+Au Au+Au 2001

  10. Momentum Resolution • Numbers from the 2001 Au+Au run • Significant improvement for d+Au

  11. Summary • In d+Au run more or less constant loss of electronics, about 50 cards had to be replaced • In 2004 Au+Au several catastrophic events due to discharges, triggered probably by high background rates lead to significant loss of acceptance • Gain reduction as a safety measure • Need additional FEE protection! • Gain reduction affects efficiency and resolution • Detector performance goals (two-track resolution, efficiency) met, some problems remain at highest multiplicity • Simulation & Embedding framework used for corrections

More Related