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P HI T S

P HI T S. Multi-Purpose P article and H eavy I on T ransport code S ystem. How to use PSFC4PHITS. May 2016 revised. Title. 1. Phase Space File. Data files recording particle source produced by clinical accelerators or 60 Co.

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P HI T S

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  1. PHITS Multi-Purpose Particle and Heavy Ion Transport code System How to use PSFC4PHITS May 2016 revised Title 1

  2. Phase Space File Data files recording particle source produced by clinical accelerators or 60Co. • Using these files, downstream simulation can be conducted without upstream simulation which requires setup details of accelerators. • The data files can be downloaded from IAEA Nuclear Data Service. • A data file consists of a pair of a header and a binary files. https://www-nds.iaea.org/phsp/phsp.htmlx What is PSF 2

  3. Phase Space File Data files recording particle source produced by clinical accelerators or 60Co. • Using these files, downstream simulation can be conducted without upstream simulation which requires setup details of accelerators. • The data files can be downloaded from IAEA Nuclear Data Service. • A data file consists of a pair of a header and a binary files. In this document, we introduce how to use PSFC4PHITS with Varian_Clinac_600C_6MV_1x1 which can be downloaded from the URL below. Header file URL: https://www-nds.iaea.org/phsp/photon1/Varian_Clinac_600C_6MV_1x1.IAEAheader Binary file URL: https://www-nds.iaea.org/phsp/photon/Varian_Clinac_600C_6MV/Varian_Clinac_600C_6MV_1x1.IAEAphsp What is PSF 3

  4. Phase Space File Header file (e.g. VarianClinaciX_6MV_05x05.IAEAheader) Use a text editor to read this file. $IAEA_INDEX: 600 // IAEA website: www-nds.iaea.org/phsp/photon/ $TITLE: PHASESPACE in IAEA format for Varian Clinac 600C, 6MV photon ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ $BYTE_ORDER: 1234 $ORIG_HISTORIES: 69184770 $PARTICLES: 9414373 ・ ・ ・ ・ ・ ・ The number of histories in original simulation ($ORIG_HISTORIES) and the number of particle data ($PARTICLES)  Required for the normalization What is PSF 4

  5. PSFC4PHITS • A program to convert from the phase space file to the dump data in PHITS format • IAEA Nuclear Data Sevice’s original program* was modified and adapted to the PHITS code • *https://www-nds.iaea.org/reports-new/indc-reports/indc-nds/indc-nds-0484.pdf 1. Make an input file for PSFC4PHITS（psfc4phits.inp）. More Details given in README 2. Copy a header file and a binary data file to the PSFC4PHITS/ directory. 3. Execute Windows: Drag psfc4phits.inp and drop intopsfc4phits_win.bat Mac: Double click psfc4phits_mac.commnad and type psfc4phits.inp + enter Name of the phase space file (without suffix extension) Varian_Clinac_600C_6MV_1x1 $ Phase space filename dmp-PHITS.out $ Output filename 1 $ Starting line 100000 $ Ending line -1 $ iopt: -1 (ASCII), 1 (binary[unformatted]) File name of dump data for PHITS iopt: option for data format Starting and ending sources to be converted. (The maximum number is the value of $PARTICLES written in a header file) PSFC4PHITS HowTo 5

  6. Outputs of PSFC4PHITS PSFC4PHITS generates a dump data file for PHITS dmp-PHITS.out (when iopt=-1) Information on particles (kf-code, x-, y-, z-coordinates, x-, y-, z-components, energy, weight value) are written in ASCII format when you set iopt=-1. PSFC4PHITS outputs 6

  7. A sample input for PHITS In order to use the converted data as a source file, you need to set the [source] section of the PHITS input file as follows: This normalization factor (totfact) is required to convert results as values per original sources. phits.inp [ S o u r c e ] set:c1[69184770] set:c2[9414373] totfact = c2/c1 s-type = 17 file = dmp-PHITS.out dump = -9 1 2 3 4 5 6 7 8 9 • C1: The number of histories in original simulation performed to make the phase space file（ORIG_HISTORIES in the header file） • C2: The number of particle data （$PARTICLES in the header file） Dump definition • 9 data are outputted • dump = -9 for iopt=-1, dump = 9 for iopt=1 • Order of particle data info specified by ID-numbers setting to use dump data 7

  8. A result of PHITS track_xz.eps The photon beam start from the surface of z=66.8cm with the positive direction of z-axis. Result of t-track tally 8

  9. Important notice • PSFC4PHITS was developed by modifying the original program developed by • Dr. Roberto Capote Noy (IAEA) • Dr. IwanKawrakow (National Research Council of Canada Ottawa) to adapt the dump data into the PHITS format. • This program can convert only data files generated in the IAEA format. • Please set the number of total history (maxcas * maxbch) less than the number of the converted sources or obtained results may be biased. Important notice 9

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