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The performance of the D0 experiment forward muon scintillation counterssystem during Run II of the Tevatron from 2001 to 2011 is described. The systemconsists of 4214 scintillation counters in six layers. The long term stabilityof the counters amplitude response determined using LED calibration system andmuons produced in proton-antiproton collisions is presented. The average signalamplitude for counters of all layers has gradually decreased over ten years by11%. The reference timing, determined using LED calibration, was stable within0.26 ns. Average value of muon timing peak position was used for periodic D0clock signal adjustments to compensate seasonal drift caused by temperaturevariations. Counters occupancy for different triggers in physics datacollection runs and for minimum bias triggers are presented. The single muonyields versus time and the luminosity dependence of yields were stable for theforward muon system within 1% over 10 years.

The Performance and Long Term Stability of the D0 Run II Forward Muon Scintillation Counters