Ethernet based list processing controller for high speed data acquisition systems

Abstract

CAMAC standard crates and modules continue to be used for nuclear and high energy physics experiments and test setups. They provide unbeaten performance in high precision measurements, flexibility and simplicity in the design of modules. We have designed and fabricated a new type of CAMAC crate controller with list processing capability to maximize the data throughput, event rate handling capability, while simultaneously simplifying software development efforts for data acquisition systems, also maintain complete compliance with CAMAC standards and ability to utilize all existing CAMAC compliant modules. The throughput increase is achieved by eliminating the arbitration between the CAMAC crate controller and list processing modules by integrating the list processor ͑auxiliary crate controller͒ and the crate controller. The event rate handling capability is increased by advanced list processing techniques such as Q-stop and hit-pattern based list processing. The resulting ethernet based list processing crate controller can transfer up to 1700 kbytes/s reaching up to hundreds of kilo events"s in 16 bit transfer mode from CAMAC modules measured at the analysis engine end. This makes it suitable for use in experimental systems, where a large number of signals with high event rates need to be collected with high precision.

Evaporation residue excitation function measurement for the16O+194Ptreaction

“…These were processed through constant fraction discriminators and were fed to the time-to-digital converter as stop signals, with the anode timing as the common start. The data were collected and analyzed using the IUAC data-sorting software CANDLE [30].…”

Spin distribution as a probe to investigate the dynamical effects in fusion reactions

“…The Ȗ-ray fold distribution was generated offline, from the 14 Time to Digital Converter (TDC) signals, using CANDLE [12] software. A Time-of-Flight (TOF) spectrum was generated using anode of MWPC as start and RF as stop.…”

Hybrid recoil mass analyzer at IUAC — First results using gas-filled mode and future plans

“…Owing to the large capacitance, the energy resolution of this detector is not good enough for resolving α-particle energies of the nearby heavy residues. The data acquisition system CANDLE [13], developed at IUAC, is used in HYRA-related experiments and the data are acquired in a shielded cabin in the experimental hall.…”