DocumentCode :
3040753
Title :
A readout system utilizing the APV25 ASIC for the Forward GEM Tracker in STAR
Author :
Visser, G.J. ; Anderson, J.T. ; Buck, B. ; Kreps, A.S. ; Ljubicic, T.
Author_Institution :
Indiana Univ., Bloomington, IN, USA
fYear :
2012
fDate :
9-15 June 2012
Firstpage :
1
Lastpage :
6
Abstract :
We have developed a modular readout system for the 30,720 channel Forward GEM Tracker recently installed in the STAR Experiment at RHIC, BNL. The modular architecture is based on a passive compact PCI backplane running a custom protocol, not PCI, connecting 6 readout modules to a readout controller module. The readout modules provide all necessary functions, including isolated power supplies, to operate up to 24 APV25 chips per module with high-impedance ground isolation. The front-end boards contain a minimal set of components as they are located inside the STAR TPC inner field cage and are inaccessible except during long shutdown periods. The front-end boards connect to the readout modules with cables up to 24 m in length, carrying unbuffered analog readout signals from the APV25 as well as power, trigger, clock and control. The readout module digitizes the APV analog samples to 12 bits at 37.532 MHz, and zero suppresses and buffers the data. The readout controller distributes trigger and clock from the central trigger system, gathers the data over the backplane, and ships it to a linux PC via a 2.125 Gbps optical data link (Detector Data Link (DDL) from ALICE). The PC gathers data from multiple readout controllers and dispatches it to the STAR event builders. The readout modules, controllers, and backplanes are housed in a common crate together with the GEM HV bias power supplies.
Keywords :
analogue-digital conversion; application specific integrated circuits; ionisation chambers; nuclear electronics; position sensitive particle detectors; proportional counters; readout electronics; APV analog samples; APV25 ASIC; APV25 chips; BNL; GEM HV bias power supplies; RHIC; STAR TPC inner field cage; STAR event builders; STAR experiment; analog readout signals; custom protocol; forward GEM tracker; front-end boards; high-impedance ground isolation; isolated power supplies; modular architecture; optical data link; passive compact PCI backplane; readout controller modules; readout system; shutdown periods; Backplanes; Clocks; Copper; Data acquisition; Detectors; Strips; Wires;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Real Time Conference (RT), 2012 18th IEEE-NPSS
Conference_Location :
Berkeley, CA
Print_ISBN :
978-1-4673-1082-6
Type :
conf
DOI :
10.1109/RTC.2012.6418172
Filename :
6418172
Link To Document :
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