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2. Update On The Code Intercomparison and Benchmark For Muon Fluence and Absorbed Dose Induced By An 18-GeV Electron Beam After Massive Iron Shielding

Author

Fassò, A., Ferrari, A., Mokhov, N. V., Mueller, S. E., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Subjects
Physics - Accelerator Physics
Abstract

In 1974, Nelson, Kase and Svensson published an experimental investigation on muon shielding around SLAC high-energy electron accelerators. They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data., Comment: 14 pp. Presented paper at the 13th Meeting of the task-force on Shielding aspects of Accelerators, Targets and Irradiation Facilities (SATIF-13), HZDR, October 10-12, 2016, Dresden, Germany. arXiv admin note: substantial text overlap with arXiv:1502.01681

Published
2017

19. Ionization yields for heavy ions in gases as a function of energy

Author

Sasaki, S., Sanami, T., Saito, K., Iijima, K., Tawara, H., Shibamura, E., and Fukumura, A.

Subjects
Ionization -- Research, Heavy ions -- Research, Particle accelerators -- Research, Business, Electronics, Electronics and electrical industries
Abstract

For the experimental determination of an average energy to produce an ion pair in gases, W, by heavy ions from accelerators, an apparatus consisting of a particle-energy degrader, an ionization chamber, and a time-of-flight (TOF) energy spectrometer was designed and constructed, where two types of pulse operation modes in an ionization chamber were employed. Using this system, the values of W were measured for He and C ions in pure argon and air as a function of the energy of ions. For the C ions, the energy dependence of W was clearly observed, while W for He ions was approximately constant over a wide rage of energy (the mean value was 26.5 [+ or -]0.9 eV in argon and 34.3 [+ or -] 1.3 eV in air, respectively) and agreed well with the value for 5.49 MeV alpha particles from 241 Am in each gas. The value of W for C ions obtained at the highest energy was also in good agreement with the value for 5.49 MeV alpha particles in each gas. Index Terms--Energy dependence, heavy ions, ionization yield, W-value.

Published
2005

20. Simultaneous measurements of absolute numbers of electrons and scintillation photons produced by 5.49 MeV alpha particles in rare gases

Author

Saito, K., Sasaki, S., Tawara, H., Sanami, T., and Shibamura, E.

Subjects
Nuclear research -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The absolute numbers of scintillation photons and electrons produced by 5.49 MeV alpha particles were measured simultaneously in argon, krypton and xenon in the gas pressure range from 1.01 x [10.sup.5] Pa to 1.01 x [10.sup.6] Pa. The ratio of the number of excited atoms to the number of electron-ion pairs is an important quantity for understanding the energy pathway of the absorbed radiation energy and was found to be 0.52, 0.55, and 0.60 in argon, krypton and xenon, respectively. The ratios were determined by measuring the number of scintillation photons originating from the excited atoms and the number of electrons. The value of [W.sub.s], which is defined as the average energy to produce one photon, in the case that all of the electron-ion pairs recombine was estimated to be 17.5, 15.4, and 13.0 eV in argon, krypton and xenon, respectively. From the relation between the numbers of electrons escaping from the recombination with ions and the numbers of scintillation photons, it is confirmed experimentally that one scintillation photon is emitted from one recombination process. This means that an excited molecule caused by three-body collisions is not de-excited without emitting a scintillation photon in the vacuum ultraviolet region. Index Terms--Absolute number of scintillation photon, ionization, radiation detector, rare gas, scintillation yields.

Published
2003

22. Absolute number of scintillation photons emitted by alpha particles in rare gases

Author

Saito, K., Tawara, H., Sanami, T., Shibamura, E., and Sasaki, S.

Subjects
Gases, Rare -- Analysis, Radioisotope scanning -- Methods, Photons -- Measurement, Business, Electronics, Electronics and electrical industries
Abstract

To determine absolute scintillation yields due to alpha particles in high-pressure rare gases, the number of scintillation photons [N.sub.p] was measured using a vacuum ultraviolet (VUV) sensitive photodiode with spectral quantum efficiency [q.sub.e]([lambda]) measured as a function of wavelength [lambda]. The absolute number of photoelectrons from the photocathode [N.sub.pe] was measured using a charge-sensitive preamplifier calibrated with respect to charge number. The collection efficiency for scintillation photons [F.sub.ce] at the photocathode was determined from the solid angle subtended by the photocathode at a scintillation point under the condition that there are no photons reflected off the surrounding walls. [N.sub.p] was determined from [N.sub.p] = [N.sub.pe]/([Q.sub.e][F.sub.ce]), where [Q.sub.e] is the average quantum efficiency calculated from [q.sub.e]([lambda]) and a relative intensity I([lamba]) of scintillation in rare gases. We measured the luminescence spectra using a VUV monochromator of known efficiency in order to obtain I([lambda]). Measurements were performed in gaseous argon, krypton, and xenon in the pressure range from 1.01 x [10.sup.5] Pa to 1.01 x [10.sup.6] Pa. [N.sub.p] in xenon at 1.01 x [10.sup.5] Pa is 1.60 x [10.sup.5] for 5.49-MeV alpha particles. Index Terms--Rare gas, scintillation yield.

Published
2002

28. Distributions of neutron yield and dose around a water phantom bombarded by 290-MeV/nucleon and 430-MeV/nucleon carbon ions

Author

Satoh, D., Kajimoto, T., Shigyo, N., Itashiki, Y., Imabayashi, Y., Matsufuji, Naruhiro, Sanami, T., Nakao, N., and Uozumi, Y.

Subjects
Physics::Medical Physics, Nuclear Theory, Nuclear Experiment
Abstract

Double-differential neutron yields from a water phantom bombarded by 290-MeV/nucleon and 430-MeV/nucleon carbon ions were measured at production angles of 15°, 30°, 45°, 60°, 75°, and 90°, and angular distributions of neutron yield and dose around the phantom were obtained. The experimental data were compared with the results of the Monte-Carlo simulation code, PHITS. The PHITS results showed a good agreement with the measured data. In addition, we estimated the angular distributions of neutron yield and dose from 0° to 180° including thermal neutrons using PHITS.

Published
2016

34. Update of the code intercomparison and benchmark for muon fluence and absorbed dose induced by a 18 GeV electron beam after massive iron shielding

Author

(0000-0001-6273-7102) Müller, S. E., Fassò, A., Ferrari, A., Mokhov, N. V., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., Versaci, R., (0000-0001-6273-7102) Müller, S. E., Fassò, A., Ferrari, A., Mokhov, N. V., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Abstract

In 1974, Nelson, Kase, and Svensson published an experimental investigation on muon shielding around SLAC high energy electron accelerators (NIM 120 (1974) 413). They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data. Updated results from this campaign are reported in the presentation.

Published
2018

36. Update On The Code Intercomparison and Benchmark For Muon Fluence and Absorbed Dose Induced By An 18-GeV Electron Beam After Massive Iron Shielding

Author

Fass��, A., Ferrari, A., Mokhov, N. V., Mueller, S. E., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Subjects
Accelerator Physics (physics.acc-ph), Physics::Instrumentation and Detectors, FOS: Physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics - Accelerator Physics, Accelerators and Storage Rings, physics.acc-ph
Abstract

In 1974, Nelson, Kase and Svensson published an experimental investigation on muon shielding around SLAC high-energy electron accelerators. They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data., 14 pp. Presented paper at the 13th Meeting of the task-force on Shielding aspects of Accelerators, Targets and Irradiation Facilities (SATIF-13), HZDR, October 10-12, 2016, Dresden, Germany. arXiv admin note: substantial text overlap with arXiv:1502.01681

Published
2017

40. Update of the code intercomparison and benchmark for muon fluence and absorbed dose induced by a 18 GeV electron beam after massive iron shielding

Author

Müller, S. E., Fassò, A., Ferrari, A., Mokhov, N. V., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics
Abstract

In 1974, Nelson, Kase, and Svensson published an experimental investigation on muon shielding around SLAC high energy electron accelerators (NIM 120 (1974) 413). They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data. Updated results from this campaign are reported in the presentation.

Published
2016

41. Code intercomparison and benchmark for muon fluence and absorbed dose induced by an 18-GeV electron beam after massive iron shielding

Author

Fasso, A., Ferrari, A., Mokhov, N. V., Mueller, S. E., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Subjects
Accelerator Physics (physics.acc-ph), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics - Accelerator Physics, Instrumentation and Detectors (physics.ins-det), Detectors and Experimental Techniques, Accelerators and Storage Rings, physics.acc-ph
Abstract

In 1974, Nelson, Kase, and Svenson published an experimental investigation on muon shielding using the SLAC high energy LINAC. They measured muon fluence and absorbed dose induced by a 18 GeV electron beam hitting a copper/water beam dump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical mode ls available at the time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results will then be compared between the codes, and with the SLAC data., 10 pp. Presented paper at the 12th Workshop on Shielding Aspects of Accelerators, Targets and Irradiation Facilities, SATIF-12, Fermilab, April 28-30, 2014

Published
2015

44. Update of the code intercomparison and benchmark for muon fluence and absorbed dose induced by a 18 GeV electron beam after massive iron shielding

Author

(0000-0001-6273-7102) Müller, S. E., Fassò, A., Ferrari, A., Mokhov, N. V., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., Versaci, R., (0000-0001-6273-7102) Müller, S. E., Fassò, A., Ferrari, A., Mokhov, N. V., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Abstract

In 1974, Nelson, Kase, and Svensson published an experimental investigation on muon shielding around SLAC high energy electron accelerators (NIM 120 (1974) 413). They measured muon fluence and absorbed dose induced by 14 and 18 GeV electron beams hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at that time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes MARS15, FLUKA2011 and GEANT4 to model the experimental setup and run simulations. The results are then compared between the codes, and with the SLAC data. Updated results from this campaign are reported in the presentation.

Published
2016

48. Code intercomparison and benchmark for muon fluence and absorbed dose induced by an 18 GeV electron beam after massive iron shielding

Author

Fass`O, A., Ferrari, A., Mokhov, N. V., Müller, S. E., Nelson, W. R., Roesler, S., Sanami, T., Striganov, S. I., and Versaci, R.

Subjects
Physics::Instrumentation and Detectors, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

In 1974, Nelson, Kase, and Svenson published an experimental investigation on muon shielding using the SLAC high energy LINAC. They measured muon fluence and absorbed dose induced by a 18 GeV electron beam hitting a copper/water beamdump and attenuated in a thick steel shielding. In their paper, they compared the results with the theoretical models available at the time. In order to compare their experimental results with present model calculations, we use the modern transport Monte Carlo codes to model the experimental setup and run simulations. The results will then be compared between the codes, and with the SLAC data.

Published
2014

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