CALMAR: A New Versatile Code Library for Adjustment from Measurements

Abstract

Abstract. CALMAR, a new library for adjustment has been developed. This code performs simultaneous shape and level adjustment of an initial prior spectrum from measured reactions rates of activation foils. It is written in C++ using the ROOT data analysis framework,with all linear algebra classes. STAYSL code has also been reimplemented in this library. Use of the code is very flexible : stand-alone, inside a C++ code, or driven by scripts. Validation and test cases are under progress. Theses cases will be included in the code package that will be available to the community. Future development are discussed. The code should support the new Generalized Nuclear Data (GND) format. This new format has many advantages compared to ENDF.

Presentation of the CALMAR-ECORCES Spectrum Adjustment Package Available at the NEA Data Bank

“…iaea.org/public/endf/utility/) or RR UNC (https://www-nds.iaea.org/IRDFF/). The CALMAR module is a least square based adjustment program [4] as STAYS'L [1]. In addition to STAYS'L, an automatic neutron spectrum level adjustment is computed.…”

“…According to the selected method, one should provide an optional prior spectrum as input. An adjustment library CALMAR has been developed and some aspects of the library has already been exposed [4], this paper focusses on the public release of the library. It describes the ECORCES module for nuclear data preparation and CALMAR module for the adjustment procedure.…”

Characterization of the CALIBAN Critical Assembly Neutron Spectra using Several Adjustment Methods Based on Activation Foils Measurement

“…CALMAR was then upgraded and the algorithm of the code was modified to compute simultaneously level and shape adjustments [5]. In comparison with STAYSL, a least square adjustment code included in CALMAR package, the level adjustment adds new correlations between the energy groups, whereas the shape adjustment lowers the correlations.…”

“…More recently, CALMAR [5], a new adjustment code currently under development at the CEA Center of Cadarache, was tested to study CALIBAN cavity neutron spectrum.…”