Cables and Racks

The electronics for TIARA can all be mounted in standard 19-inch electronics racks. The amplifiers and the preamplifiers are each mounted in NIMbins, and the discriminators are mounted in a CAMAC crate. In some experiments (where the Exogam electronics is not employed) it will be necessary to mount ADC units close-by, in their VXI crate. Thus, two full-height 19-inch racks will be necessary to hold all of the electronics. Two different categories of experiment, depending on whether or not the Exogam electronics is used, give two different cabling requirements. Since the choice of acquisition system is largely driven by the beams and energies required, and hence by the physics, both systems need to be catered for. In the first instance where Exogam electronics and data acquisition is used, there are certain basic requirements for cabling: ribbon cables within the vacuum of the TIARA chamber, Lemo flange adapter and cables between the chamber and the preamplifier inputs. With the electronics mounted in the target area close to the Exogam electronics, the amplifiers can be connected to the CFD's via ribbon cables and also to the ADC's via ribbon cables. In the case where the GANIL acquisition system is used (say, on the LISE line), then it is best to bring all of the preamplifier signals out to the counting room which will require long cable runs (20-30 metres) of well-screened coaxial cable with patch-panels at each end to adapt from Lemo cables to BNC cable.