ICALEPCS2013 - List of Authors (Rey, F.)

Paper

Title

Page

FPGA Implementation of a Digital Constant Fraction for Fast Timing Studies in the Picosecond Range

774

P. Mutti, J. Ratel, F. Rey, E. Ruiz-Martinez
ILL, Grenoble, France

Thermal or cold neutron capture on different fission systems is an excellent method to produce a variety of very neutron-rich nuclei. Since neutrons at these energies bring in the reaction just enough energy to produce fission, the fragments remain neutron-rich due to the negligible neutron evaporation thus allowing detailed nuclear structure studies. In 2012 and 2013 a combination of EXOGAM, GASP and Lohengrin germanium detectors has been installed at the PF1B cold neutron beam of the Institut Laue-Langevin. The present paper describes the digital acquisition system used to collect information on all gamma rays emitted by the decaying nuclei. Data have been acquired in a trigger-less mode to preserve a maximum of information for further off-line treatment with a total throughput of about 10 MByte/sec. Special emphasis is devoted to the FPGA implementation of an on-line digital constant fraction algorithm allowing fast timing studies in the pico second range.

Poster TUPPC083 [9.928 MB]

Paper	Title	Page
TUPPC083	FPGA Implementation of a Digital Constant Fraction for Fast Timing Studies in the Picosecond Range	774
	P. Mutti, J. Ratel, F. Rey, E. Ruiz-Martinez ILL, Grenoble, France
	Thermal or cold neutron capture on different fission systems is an excellent method to produce a variety of very neutron-rich nuclei. Since neutrons at these energies bring in the reaction just enough energy to produce fission, the fragments remain neutron-rich due to the negligible neutron evaporation thus allowing detailed nuclear structure studies. In 2012 and 2013 a combination of EXOGAM, GASP and Lohengrin germanium detectors has been installed at the PF1B cold neutron beam of the Institut Laue-Langevin. The present paper describes the digital acquisition system used to collect information on all gamma rays emitted by the decaying nuclei. Data have been acquired in a trigger-less mode to preserve a maximum of information for further off-line treatment with a total throughput of about 10 MByte/sec. Special emphasis is devoted to the FPGA implementation of an on-line digital constant fraction algorithm allowing fast timing studies in the pico second range.
	Poster TUPPC083 [9.928 MB]