scholarly journals MONACO v2: Multipurpose and Integrated Data Acquisition System for On-line Neutron and Gamma Measurements

2020 ◽  
Vol 225 ◽  
pp. 03012 ◽  
Author(s):  
L. Barbot ◽  
D. Fourmentel ◽  
G. De Izarra ◽  
C. Destouches ◽  
J-F. Villard ◽  
...  
Keyword(s):  
Pulse Height ◽  
Current Mode ◽  
Automatic Generation ◽  
Pulse Mode ◽  
Acquisition System ◽  
Operating Modes ◽  
Pulse Height Analysis ◽  
On Line ◽  
Self Powered ◽  
Nuclear Instrumentation

The CEA MONACO v2 a multichannel acquisition system dedicated to neutron and gamma measurements. It is unique as it integrates all the following features in one module: automatic generation of saturation curves, automatic generation of pulse discrimination curves, detector pulse characterization using the embedded oscilloscope module, pulse mode acquisitions in count rate or pulse height analysis, fluctuation mode and current mode acquisitions. Sensors are plugged to a single connector and the implemented operating modes run constantly in parallel. Firsly designed for on line local neutron and gamma measurements with gaseous detectors in reactor experiments, the MONACO v2 system will also be available for self-powered detectors thanks to its wide current mode working range. After two years of development, CEA teams tested two MONACO v2 prototypes in the Slovenian TRIGA Mark II research reactor in 2018, using CEA miniature ion chambers and SPNDs. The system is now ready for industrialization to be available on the nuclear instrumentation market.

scholarly journals Development of a Wideband Current Amplifier dedicated to Fission Chamber Measurement

2021 ◽  
Vol 253 ◽  
pp. 04015
Author(s):  
Danilo Bisiach ◽  
Loïc Barbot ◽  
Grégoire De Izarra ◽  
Christophe Destouches ◽  
Manuel Cargnelutti ◽  
...  
Keyword(s):  
Neutron Flux ◽  
Nuclear Power ◽  
Power Plants ◽  
Dynamic Range ◽  
Current Mode ◽  
Pulse Mode ◽  
Fission Chamber ◽  
Current Pulses ◽  
Nuclear Instrumentation ◽  
Fluctuation Mode

Fission chambers are widely used in nuclear reactors, either occasionally to probe the neutron flux maps in nuclear power plants or as part of the nuclear instrumentation used in research reactors to characterize neutron flux levels in irradiation locations. Wide dynamic range acquisition systems are very limited in the nuclear instrumentation market. Thus, since 2012, CEA is developing the MONACO system, which allows measurement in pulse, fluctuation, and current mode running simultaneously on the same channel. The simultaneous use of three measurement modes places high requirements on the amplification stage. Indeed, the current mode exploits a bandwidth between 0 and a few kHz, while the fluctuation mode is based on the frequency range of 100 kHz 1MHz. Finally, for the pulse mode, it is necessary to identify current pulses of a few uA in amplitude and with a duration of about ten nanoseconds, which implies a bandwidth that extends up to 10 or 20 MHz. In the frame of the industrialization of the MONACO system, a new preamplifier was designed to meet those requirements. With a first prototype, LDCI and I-TECH performed very promising bench tests in October 2020. Tests with synthetic signals corresponding to pulse and fluctuation mode showed very good performance of the electronics. The positive and negative current pulses are correctly amplified and the measurement noise was estimated at 0.1 µApp thanks to proper electronic shielding. The DC measurement is also satisfactory in the tested range with an accuracy of less than nA and a bandwidth of 1kHz. Preamplifier qualifications are planned within realistic experiments using a fission chamber placed in a neutron field.

Multiparameter pulse-height analysis with a PDP-8/e computer

1974 ◽  
Vol 121 (3) ◽  
pp. 573-580 ◽  
Author(s):  
N.S. Kendrick ◽  
D.A. McClure
Keyword(s):  
Pulse Height ◽  
Pulse Height Analysis

Electrodeposition of Ni-Mo Defect-Free Alloy from Ammonium-Citrate Electrolyte in Pulse Current Mode

MRS Advances ◽  
2017 ◽  
Vol 2 (58-59) ◽  
pp. 3585-3589
Author(s):  
Sergey M. Karabanov ◽  
Yulia M. Stryuchkova ◽  
Dmitriy V. Suvorov ◽  
Gennadiy P. Gololobov ◽  
Dmitry Yu. Tarabrin ◽  
...  
Keyword(s):  
Pulse Current ◽  
Current Mode ◽  
Density Variation ◽  
Pulse Mode ◽  
Ammonium Citrate ◽  
Molybdenum Alloy ◽  
Nickel Substrate ◽  
Sem Images ◽  
Citrate Electrolyte ◽  
Electrolysis Mode

ABSTRACT Electrodeposition in pulse current mode of nickel-molybdenum alloy on a nickel substrate was studied. The range of current density variation from 2 to 9 A/dm2 was investigated. The range of pulse and pause step lengths is from tens to hundreds of milliseconds. SEM-images of applied coatings surfaces are obtained. The method of energy dispersive spectroscopy determined that the molybdenum content in the coating is 21-24 wt%. It was found that under transient pulse mode of electrolysis, with the pulse step corresponding to hundreds of milliseconds, the most rigid and smooth coatings of the electrolytic nickel-molybdenum alloy are obtained from ammonium-citrate electrolyte. It is shown that the percentage of nickel in the alloy does not depend on the electrolysis mode.

A new soft x-ray pulse height analysis array in the HL-2A tokamak

2009 ◽  
Vol 80 (12) ◽  
pp. 126104 ◽  
Author(s):  
Y. P. Zhang ◽  
Yi Liu ◽  
J. W. Yang ◽  
X. Y. Song ◽  
M. Liao ◽  
...  
Keyword(s):  
Pulse Height ◽  
X Ray ◽  
Pulse Height Analysis

scholarly journals Plasma impurities observed by a pulse height analysis diagnostic during the divertor campaign of the Wendelstein 7-X stellarator

2018 ◽  
Vol 89 (10) ◽  
pp. 10F111 ◽  
Author(s):  
M. Kubkowska ◽  
A. Czarnecka ◽  
T. Fornal ◽  
M. Gruca ◽  
S. Jabłoński ◽  
...  
Keyword(s):  
Pulse Height ◽  
Pulse Height Analysis ◽  
Plasma Impurities
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