Title :
Progress in the development of the DTMROC time measurement chip for the ATLAS Transition Radiation Tracker (TRT)
Author :
Alexander, C. ; Anghinolfi, F. ; Dressnandt, N. ; Ekenberg, T. ; Farthouat, Ph. ; Keener, P.T. ; Lam, N. ; La Marra, D. ; Mann, J. ; Newcomer, F.M. ; Ryjov, V. ; Soderberg, M. ; Szczygiel, R. ; Van Berg, R. ; Williams, H.H.
Abstract :
A 16-channel digital time-measurement readout chip (DTMROC) has been fabricated in the TEMIC/DMILL BI-CMOS radiation-hard process for the Large Hadron Collider (LHC) Transition Radiation Tracker (ATLAS/TRT) at CERN. The chip receives discriminated straw-drift-tube signals from bipolar amplifier-shaper-discriminator chips (ASDBLR), measures the arrival time in 3.125 ns increments (±1 ns), and stores the data in a pipeline for 3.3 μs. A trigger signal (L1A) causes the data to be tagged with a time stamp and stored for readout. Up to 13 events may be stored in an on-chip buffer while data is being clocked out in a 40 MHz serial stream. The chip has been designed to function after exposure to 1×1014 protons/cm2 and 1 Mrad total dose. System beam-tests have demonstrated measurement of track positions with a resolution of 165 μm and 85% efficiency at rates up to 18 MHz
Keywords :
BiCMOS digital integrated circuits; digital readout; digital signal processing chips; discriminators; nuclear electronics; pulse shaping circuits; transition radiation detectors; trigger circuits; 1 Mrad; 18 MHz; 40 MHz; 85 percent; ATLAS Transition Radiation Tracker; DTMROC time measurement chip; TEMIC/DMILL BI-CMOS radiation-hard process; arrival time; bipolar amplifier-shaper-discriminator chips; on-chip buffer; straw-drift-tube signals; trigger signal; Buffer storage; Clocks; Pipelines; Position measurement; Semiconductor device measurement; Signal resolution; Testing; Time measurement; Timing; Variable speed drives;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2000 IEEE
Conference_Location :
Lyon
Print_ISBN :
0-7803-6503-8
DOI :
10.1109/NSSMIC.2000.949892
