| Paper | Title | Page |
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| TUPSB53 | Measurement of Parameters of Neutron Radiation on the Accelerator-Based Epithermal Neutron Source | 337 |
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Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. The accelerator-based epithermal neutrons source, proposed and created in the Budker Institute of Nuclear Physics, provides the generation and formation of a neutron flux suitable for testing the boron neutron capture therapy of malignant tumors. The paper presents and discusses the results of studies using activation techniques. Using activation foils from the SWX-1552 kit (Shieldwerx, USA), an iterative grid method for reconstructing the neutron spectrum was tested. It was found that the use of activation foils for determining the spectrum of epithermal neutrons is questionable, since the main part of the interaction falls on the high-energy part of the spectrum, instead of the resonance of the foil. The number of neutrons is equal to the number of activated beryllium-7 nuclei (it has been proven by measurements that beryllium-7 is not sputtered from the lithium layer). The neutron yield was monitored by registering gamma quanta from the 7Li(p, n)7Be reaction. Depending on the number of registered gamma quanta, recalculation was made for the amount of activated beryllium. In this paper it was measured the number of neutrons depending on different geometries, different parameters of the proton beam and target material, there is a good agreement with the theory. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-TUPSB53 | |
| About • | Received ※ 24 September 2021 — Revised ※ 25 September 2021 — Accepted ※ 29 September 2021 — Issued ※ 02 October 2021 | |
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| WEPSC31 | 2D-Tomography of the Proton Beam in the Vacuum Insulated Tandem Accelerator | 402 |
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Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. If the parameters of the proton beam change (energy and current of the beam, the parameters of the ion-optical system, the parameters of the ion source) - accordingly the conditions for the beam transportation change (its size, angular divergence, and position relative to the axis of the accelerator). For optimal conduction of the beam along the beam line, two-dimensional tomography of the beam can be used: using a cooled diaphragm with a diameter of several millimeters installed on a vacuum three-dimensional motion input and a Faraday cup, fast chord measurements are carried out, on the basis of which the beam profile is restored. The beam profile obtained by this way is somewhat different from the profile obtained by measuring the phase portrait of the beam using a wire scanner*. The advantage of this method is a relatively short time to restore the profile, depending on the diameter of the cooled diaphragm. * M. Bikchurina, at al. Measurement of the phase portrait and emittance of the proton beam and neutral atoms in the accelerator based epithermal neutrons source. These proceedings. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC31 | |
| About • | Received ※ 21 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 09 October 2021 | |
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| WEPSC32 | Proton Beam Size Diagnostics Used in the Vacuum Insulated Tandem Accelerator | 404 |
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Funding: The research was supported by Russian Science Foundation, grant No. 19-72-30005. For the development of a promising method for the treatment of malignant tumors - boron neutron capture therapy - the accelerator-based epithermal neutron source has been proposed and created in the Budker Institute of Nuclear Physics. After the acceleration phase, a proton beam with an energy of up to 2.3 MeV and a current of up to 10 mA is transported in a high-energy beam line. With a beam size of 1 cm2, its power density can reach tens of kW/cm2. Diagnostics of the size of such a powerful beam is a nontrivial task aimed at increasing the reliability of the accelerator. The paper presents such diagnostics as: 1) the use of the blister formation boundary during the implantation of protons into the metal; 2) the use of thermocouples inserted into the lithium target; 3) the use of the melting boundary of the lithium layer when it is irradiated with a beam; 4) the use of the activation of the lithium target by protons; 5) the use of video cameras; 6) the use of an infrared camera; 7) the use of the luminescence effect of lithium when it is irradiated with protons; 8) the use of collimators with a small diameter of 1-2 mm; 9) the use of the method of two-dimensional tomography*. * M. Bikchurina, et al 2D tomography of the proton beam in the vacuum-insulated tandem accelerator. These proceedings. |
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| DOI • | reference for this paper ※ doi:10.18429/JACoW-RuPAC2021-WEPSC32 | |
| About • | Received ※ 22 September 2021 — Revised ※ 29 September 2021 — Accepted ※ 09 October 2021 — Issued ※ 19 October 2021 | |
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