3. DESCRIPTION OF PROGRAM OR FUNCTION
TART2012 is a coupled neutron-photon Monte Carlo transport code designed to use three-dimensional (3-D) combinatorial geometry. Neutron and/or photon sources as well as neutron induced photon production can be tracked. It is a complete system to assist you with input preparation, running Monte Carlo calculations, and analysis of output results. TART2012 is also incredibly FAST; if you have used similar codes, you will be amazed at how fast this code is compared to other similar codes. Use of the entire system can save you a great deal of time and energy.
TART2012 extends the general utility of the code to even more areas of application than available in previous releases by concentrating on improving the physics, particularly with regard to improved treatment of neutron fission, resonance self-shielding, molecular binding, and extending input options used by the code. Several utilities are included for creating input files and displaying TART results and data.
TART2012 uses the latest ENDF/B-VI, Release 8, data. New for TART2012 is the use of continuous energy neutron cross sections, in addition to its traditional multigroup cross sections. For neutron interaction, the data are derived using ENDF-ENDL2005 and include both continuous energy cross sections and 700 group neutron data derived using a combination of ENDF/B-VI, Release 8, and ENDL data. The 700 group structure extends from 10-5 eV up to 1 GeV. Presently nuclear data are only available up to 20 MeV, so that only 616 of the groups are currently used. For photon interaction, 701 point photon data were derived using the Livermore EPDL97 file. The new 701 point structure extends from 100 eV up to 1 GeV, and is currently used over this entire energy range.
TART2012 completely supersedes all older versions of TART, and it is strongly recommended that one use only the most recent version of TART2012 and its data files. Check author's homepage for related information: http://home.comcast.net/~redcullen1/index.htm .
- Corrected S(a,b) coherent scatter to, scatter in the Lab (not CM) system. Coherent scatter with no change speed.
- Updated neutrons/fission sampling to include correction to conserve < nu >.
- Corrected criticality flux by material normalize Now EXACTLY = Analog fission neutrons produce so they sum to total analog flux.
- Missive change to correct reactall and reacted. Now only analog - output also by ZA/C.
- Added C=47-54 charged particle reactions (currently only C=48 in ZA=30000).
- Changed weights to relative - insure each source particle (neutron/photon) has a total weight = 1
- Removed bias and biasg - only way to insure the total weight = 1
- Corrected high energy exponential spectra fit
- Added stack to build for photon re-entry problem
- High energy fission fit now E*Exp[-a*E]
- Low energy fission fit sqrt( E) to higher energy
- Spectra sqrt( E) below 10 keV.
- (n,n') neat threshold, low energy extension.
- Updated NEWCROSS for ENDF/B-VII U238.
- Updated for over 1,000,000 zones; extended output format.
- Corrected cneutal and cphotal (was ignored)
- Sentl 60 Intermediate Resonances now standard
- Complete rewrite to incorporate all user feedback.
- Made 64 bit compiler compatible.
- Eliminated re-entrant coding.
- Neutrons and photons sources now treated same.
- sentl 1 = 3 (neutron AND photon sources) is no longer allowed
- Because of the above, sentl 18 photon/neutron source ratio no longer has any meaning.
- Data files updated based on ENDF/B-VII.1 data.