RSICC Home Page TART2022


1.         NAME AND TITLE

            TART2022:     Coupled Neutron-Photon, 3-D, Combinatorial Geometry, Time Dependent, Monte Carlo Transport Code System.

Auxiliary Codes

            TARTCHEK:   Check TART input and Display TART Results.

                        TARTAID:       Create TART input.

EPICSHOW:    Display Atomic and Nuclear data used by TART.

PLOTTAB:      General Plotting Code to Display TART output.

EDITOR:         Text editor for use with TART.

                        UTILITY:        A collection of useful codes.


            Data Libraries

                        TARTND:        Neutron interaction data

                        TARTPPD:       Neutron induced photon production data

                        GAMDAT:       Photon interaction data

                        NEWCROSS:   Neutron self-shielding, multi-band parameter data

                        NEUTRON      Neutron continuous energy cross sections


2.         CONTRIBUTOR

            Lawrence Livermore National Laboratory, Livermore, California.



            Fortran; IBM-PC (Windows or Linux), Linux workstations and MacOS (C00638MNYCP09).



            TART2022 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. TART2022 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.


            TART2022 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.


            TART2022 uses the latest ENDF/B-VI, Release 8, data. New for TART2022 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.


            TART2022 completely supersedes all older versions of TART, and it is strongly recommended that one use only the most recent version of TART2022 and its data files. Check author’s homepage for related information: .


Recent Updates:


-                      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.


-                      Eliminated ALL computer dependence; identical for IBMPC, LINUX, MAC, etc….

-                      Updated FORTRAN to allow improved optimization and speed

-                      Corrected various options.

-                      Neutron Data files based on the latest ENDF/B-VII data and preliminary ENDF/B-VIII .

-                      Photon Data files based on my EPICS2014; official ENDF/B electron and photon data

-                      Because of the above, sentl 18 photon/neutron source ratio no longer has any meaning.

-                      Added utility code TimeKeff we display sub-critica time dependent K-eff




            Monte Carlo radiation transport of neutrons and/or photons.



            None noted.



            TART is very fast. The TART2022 example of 68 problems required a total of 19 seconds (less than one second per problem) on an AMD 3500+ running Windows.  For a complete list of running times on a variety of computers, see the TART documentation as well as the website,




            TART2022 runs on IBM-PC (Windows and Linux), Cray, Unix workstations (Sun, IBM RS/6000, DEC-Alpha, etc.), and Power MAC. It is written in such standard Fortran that it should be relatively easy to implement and use on any computer.



            TART2022 is designed to run on any computer. It is presently implemented various Unix workstations, IBM-PC (Windows and Linux), Cray, and Power MAC.  For use on IBM-PC and Power MAC, the entire system is distributed in executable form, so that no compiler or loader is required on these systems.  Since executables are distributed for these computers, Fortran source code is not included.  The ABSOFT Fortran compiler was used to create included executables for Windows, which run under 32-bit systems. The Intel 9.1 compiler was used to create executables on a 32-bit Red Hat Linux system; these executables were also tested on 64-bit Opterons running RHEL 4. On all other computers, a Fortran compiler which supports Cray-like pointers is required. In addition, on Unix workstations the graphics portion of the system requires a C compiler.


10.       REFERENCES

            a) distributed as electronic files:

D. E. Cullen, “TART2022 – An Overview of A Coupled Neutron-Photon 3-D, Combinatorial Geometry, Time Dependent Monte Carlo Transport Code,” LLNL-TR-577352 (September 19, 2022).

D. E. Cullen, “TART2012 – An Overview of A Coupled Neutron-Photon 3-D, Combinatorial Geometry, Time Dependent Monte Carlo Transport Code,” LLNL-TR-577352 (July .22, 2012).

            D. E. Cullen, “TART2005 - A Coupled Neutron-Photon 3-D, Combinatorial Geometry, Time Dependent Monte Carlo Transport Code,” UCRL-SM-218009 (Nov.22, 2005).

            D.E. Cullen, A.L. Edwards and E.F. Plechaty, "TART95: A Coupled Neutron-Photon Monte Carlo Transport Code," Lawrence Livermore National Laboratory, UCRL-MA-121319 (July 4, 1995) on CD in the TART2005\DOCUMENT\TART95 subdirectory.

            b) references for data in this package are available on the author’s website:

            D.E. Cullen., “A Temperature Dependent ENDF/B-VI, Release 8 Cross Section Library,” UCRL-ID-127776, Rev. 2 (May 22, 2003). This document is distributed with the DLC-218/POINT2003 package.

            D.E.Cullen, “POINT 2004: A Temperature Dependent ENDF/B-VI, Release 8 Cross Section Library”, Lawrence Livermore National Laboratory, UCRL-TR-202284, April 2004.



            The package is distributed on CD in MAC, Windows and Linux formats.  The CD contains the source codes, precompiled executables for MAC and IBM PC (Windows and Linux), data files and test cases for use on a variety of computers. Installation and verification instructions for each type of computer are included.



            December 1995, revised May 1997, March 1998, April 1999, September 2001, September 2003, November 2005, August 2006, June 2013 Febuary 2027, May 2022; Rev November 2022