Primary Ionization Density Produced by Charged Fragments in the Working Volume of the Fission Chambers

2021 ◽  
Vol 24 (4) ◽  
pp. 329-337
Author(s):  
A. A. Khrushchinsky ◽  
S. A. Kuten
Keyword(s):  
Spatial Distribution ◽  
Ion Pairs ◽  
Sensitive Volume ◽  
Active Volume ◽  
Fission Chamber ◽  
Ionization Density ◽  
Working Volume ◽  
Fission Chambers ◽  
235U Fission ◽  
Primary Ionization

The question of the spatial distribution of ion pairs created by 235U fission fragments in the active volume of the fission chamber has been studied. The formulas of the spatial distribution of ion pairs in cylindrical fission chambers are proposed, which allows you to evaluate correctly the density of ion pairs in any point in the sensitive volume of the fission chamber

scholarly journals Characterization and localization of partial-discharge-induced pulses in fission chambers designed for sodium-cooled fast reactors

2018 ◽  
Vol 170 ◽  
pp. 03002
Author(s):  
G. Galli ◽  
H. Hamrita ◽  
C. Jammes ◽  
M.J. Kirkpatrick ◽  
E. Odic ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Flux ◽  
Electrical Discharge ◽  
Partial Discharge ◽  
Electrical Signal ◽  
Fast Reactors ◽  
Electrode Gap ◽  
Fission Chamber ◽  
Flux Monitoring ◽  
Fission Chambers

During the operation of the Superphenix and Phenix reactors, an aberrant electrical signal was detected from the fission chambers used for neutron flux monitoring. This signal, thought to be due to partial electrical discharge (PD) is similar to the signal resulting from neutron interactions, and is generated in fission chambers at temperatures above 400 °C. This paper reports work on the characterization and localization of the source of this electrical signal in a High Temperature Fission Chamber (HTFC). The relation between the shape of the PD signal and various parameters (nature and pressure of the chamber filling gas, electrode gap distance, and fission chamber geometry) are first described. Next, experiments designed to identify the location within the chambers where the PD are being generated are presented. After verification and refinement of the results of these localization studies, it should be possible to propose changes to the fission chamber in order to reduce or eliminate the PD signal.

scholarly journals Test Results of an Innovative and Modular Sensor Design for Fission Chamber Studies

2020 ◽  
Vol 225 ◽  
pp. 03006
Author(s):  
G. de Izarra ◽  
B. Geslot ◽  
S. Bréaud ◽  
A. Pepino ◽  
J-F. Villard ◽  
...  
Keyword(s):  
Calibration Procedure ◽  
Electrode Gap ◽  
Fission Chamber ◽  
Experimental Database ◽  
Simulation Tools ◽  
Code Validation ◽  
Experimental Validations ◽  
Chamber Studies ◽  
Set Up ◽  
Fission Chambers

Since many years, the Instrumentation, Sensors and Dosimetry laboratory at CEA Cadarache has been working to propose innovative and robust design of fission chambers. In this framework, few simulation tools like Chester or PyFc were developed to make detector prototyping and optimisation possible. Up to now, the code experimental validations are scarce mainly because of the lack of flexibility of regular fission chambers. In order to set up an experimental database for code validation, an innovative modular twin fission chamber, the CFTM, was designed. It allows to set with precision the inter-electrode gap, the filling gas pressure as well as the fissile deposit used. This detector was irradiated in Minerve zero power reactor in order to gather results for code validation. Thanks to a calibration procedure, a bank of experimental results is available for simulation validation.

Fast Neutron-Flux Monitoring Instrumentation for Lead Fast Reactors: A Preliminary Study on Fission Chamber Performances

2014 ◽  
Author(s):  
Luigi Lepore ◽  
Romolo Remetti ◽  
Mauro Cappelli
Keyword(s):  
Neutron Flux ◽  
Fuel Cycle ◽  
Fast Reactors ◽  
Fission Chamber ◽  
Enhanced Sensitivity ◽  
Flux Monitoring ◽  
Preliminary Study ◽  
Fast Flux ◽  
Absolute Measurements ◽  
Fission Chambers

Although Sodium Fast Reactors (SFRs) are the most investigated solutions for the future fast-flux facilities so far, Lead Fast Reactors (LFRs) promise to be a very competitive alternative thanks to their peculiarity concerning coolant-safety, fuel cycle and waste management. Nevertheless, the development of LFRs presents today some drawbacks still to be solved. Due to the harder neutron flux, the current instrumentation developed for SFRs is likely to be extended to LFRs as a first attempt. Otherwise, new monitoring instrumentation could be developed in order to assure more tailored results. Different measurement technologies can be considered for fast flux monitoring and flux absolute measurements in order to provide a reliable and quick calibration of the overall reactor neutron instrumentation. The goal of this paper is to study the validity of typical fast reactor fission chamber designs (e.g. SuperPhénix fission chambers), indicating which are the limitations when used in a LFR environment. Afterwards, alternative detector solutions with enhanced sensitivity and response will be proposed.

scholarly journals A Gas Proportional Chamber for use in Cosmic X-Ray Research

1971 ◽  
Vol 41 ◽  
pp. 213-213
Author(s):  
P. Serlemitsos
Keyword(s):  
Ion Pairs ◽  
Incident Radiation ◽  
Weak Field ◽  
List Type ◽  
Sensitive Volume ◽  
Modular Construction ◽  
Large Area ◽  
X Ray ◽  
Proportional Chamber ◽  
The Many

Multi-anode gas proportional counters, when used in cosmic X-ray research, offer several advantages over more conventional large area detectors. Some of these are:1.Low detector background, effected by excluding from the sensitive volume, areas in the proximity of the counter walls, and by requiring that the region of interaction is localized inside the counter.2.Uniform response which makes possible energy resolution limited primarily by the statistics on the number of electron-ion pairs in the interaction, rather than by partial charge collection due to weak field regions inside the counter.3.Information relating to the interaction depth within the gas, which may be used in applying consistency checks regarding the nature of the incident radiation.Methods have been devised for the modular construction of such counters, with particular emphasis on such items as, large areas, ease of assembly, matching of the many counter modules, accurate collimation, window supports, and shape integrity under differing amounts of differential pressure. Detector background at rocket altitudes was found to be flat above 2 keV, and less than 10−3 cm−2 s −1keV−1.

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