HERMES implementation of the PCOS4 system

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:577685

Cisbani, E; Colilli, S; Frullani, S ^[1]

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1. Istituto Superiore di Sanita and Sezione Sanita, Rome (Italy); and others

The PCOS4 system is successfully in use to read out the multiwire proportional chambers of the HERMES spectrometer. HERMES is a physics experiment running at the 27.5 GeV electrons - 830 GeV protons HERA collider in Hamburg. Its purpose is to perform systematic and precise measurements of the spin dependent nucleon structure functions. The PCOS4 system consists of 3 main parts: the amplifier/discriminator/delay line and serial driver front-end board, the VME/CAMAC control modules and the interface (BackPlane) between the two. The boards send and receive the data over a serial high speed (20 Mbits/s) readout line: they axe fully remote configurable., via the VME control modules. The higher complexity respect to other MWPC readout systems demanded better performances, smaller space occupancy and reduced cabling still yielding a reduced cost/channel. The PCOS4 system has been modified to fulfill the specific requirements of the HERMES experiment: the tight space limits, a fast readout and a high degree of reliability. Those requirements originated the redesign of the PCOS4 front-end board in a compact size and the use of VME controllers instead of the CAMAC ones to double the transmission speed. Finally, the custom-made BackPlane has been greatly improved in order to make the system very stable and reliable.

• OSTI ID: 577685
• Report Number(s): CONF-970565--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
43 PARTICLE ACCELERATORS
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
CAMAC SYSTEM
HERA STORAGE RING
MULTIWIRE PROPORTIONAL CHAMBERS
READOUT SYSTEMS
TRIGGER CIRCUITS