Investigation of the thermal performance of natTe target for 124I production in the RARS cyclotron
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H. Azizakram
Abstract
Regarding the low thermal conductivity of natTe element, the provision of an effective cooling system is one of the critical issues in cyclotron targetry to prevent melting of target matter during the irradiation to 124I production via natTe(p,xn)124I reaction. Heat transfer on Te target and efficiency of cooling fluid in the solid target system have been simulated based on a Finite Element Analysis (FEA) code for the thermal behavior of the target during the irradiation and under different beam currents, coolant flow rates, substrate matters and target geometry. The results on the routinely used solid target in Radiation Application Research School (RARS) cyclotron showed that in a 3 m/s coolant flow rate, by using a fined-cooling system and a nickel substrate coated on copper backing plate, the irradiation beam current can be raised up to 180 μA without any risk of melting. The cooling flow rates greater than 3 m/s do not noticeably improve the heat dispersion of target layer. As expected, a linear increase was observed for the temperature and temperature gradient of plates in the beam currents of 100–300 μA.
Kurzfassung
In Bezug auf die niedrige Wärmeleitfähigkeit des natTe-Elements ist die Bereitstellung eines effektiven Kühlsystems einer der kritischen Punkte bei Zyklotrontargets um das Schmelzen des Targetmaterials während der Bestrahlung zur Erzeugung von 124I über die natTe(p,xn)124I Reaktion zu vermeiden. Die Wärmeübertragung auf das Te Target und die Effizienz der Kühlflüssigkeit im Targetsystem wurden simuliert auf der Basis eines Finite-Elemente-Analysecodes (FEA) für das Wärmeverhalten des Targets während der Bestrahlung mit verschiedenen Strahlströmen, Kühlmittelströmungsraten, Trägermaterialien und Targetgeometrien. Die Ergebnisse in Bezug auf das routinemäßig verwendete Target im Zyklotron der Radiation Application Research School (RARS) zeigten, dass bei einer Kühlmittelströmungsrate von 3 m/s und Verwendung eines fined-cooling Systems und einer Nickel-überzogenen Kupferplatte kann der Strahlstrom bis zu 180 μA erhöht werden, ohne dass das Target schmilzt. Kühlmittelströmungsraten größer als 3 m/s verbessern die Wärmeverteilung auf der Targetoberfläche nicht merkbar. Wie erwartet, wurde ein linearer Anstieg bei der Temperatur und dem Temperaturgradienten von Platten im Strahlstrom bei 100–300 μA beobachtet.
References
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© 2017, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Investigation into the impacts of distributed inlet temperature on thermal limit during LFWH event in Chinshan plant
- Experimental study on saturated boiling of two phase natural circulation under low pressure in narrow rectangular channels
- Criticality safety analysis of TK-13 cask in Bushehr nuclear power plant
- Preliminary neutronic study on Pu-based OTTO cycle pebble bed reactor
- Developing light nano-composites with improved mechanical properties for neutron shielding
- Time-dependent variation of the neutron multiplication factor in spent fuel storage
- Investigation of the thermal performance of natTe target for 124I production in the RARS cyclotron
- Ultrasonic-resonator-combined apparatus for purifying nuclear aerosol particles
- Adams-Bashforth-Moulton method with Savitzky-Golay filter to reduce reactivity fluctuations
- Application of Pareto optimization method for ontology matching in nuclear reactor domain
- Technical Note
- New finite element-based modeling of reactor core support plate failure
- The critical slab problem for pure-triplet anisotropic scattering by singular eigenfunction method
