Ionizing radiation compatibility in the MITICA neutral beam prototype

Bagatin, M.; Coniglio, A.; D’Arienzo, Marco; Lorenzi, A. De; Gerardin, Simone; Paccagnella, A.; Pasqualotto, R.; Peruzzo, S.; Sandri, Sandro; Zaniol, B.

doi:10.1016/j.fusengdes.2011.02.021

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…The expected gamma spectrum is also almost flat up to 10MeV. The maximum estimated neutron fluxes are about 10 9 neutrons/(cm 2 ·s) and just lower for gamma fluxes, in the region where terminations will be installed, with total fluences based on a predicted lifetime exposure of 10 7 s [17].…”

Section: Requirements For Sensor Selectionmentioning

confidence: 93%

Design and R&D for MITICA thermal sensors

Palma

Pomaro

Maniero

et al. 2013

2013 IEEE 25th Symposium on Fusion Engineering (SOFE)

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In MITICA, the ITER neutral beam injector prototype, in-vessel components will be instrumented with thermocouples for material thermal measurements and water cooling calorimetry.A subset of MITICA thermal sensors will be installed in ITER Neutral Beam Injectors and it will consist of type N Mineral Insulated (MI) thermocouples with Ultra High Vacuum (UHV) compatible termination. Each sensor will end with a metallic/ceramic transition from MI cable to two pins suitable for direct integration into a Remote Handling (RH) compatible connector.A set of sensor prototypes has been procured and tests demonstrate the measuring capability and UHV compatibility: electrical insulation, conductivity, dielectric, and helium bombing tests passed, thus satisfying the technical requirements.The in-vessel thermal sensor system extends from the sensing junction up to the safety important feedthroughs at the vessel vacuum barrier. The whole cabling has been designed to be RH compatible to perform maintenance and replacement of components. The in-vessel RH compatible connector and the safety important feedthrough have been developed to house sensor cabling in a reliable and compact design, coping with all requirements. The design of different sensing junction types has been integrated with reliable mechanical fastenings, providing good and stable thermal contact.The paper describes the thermal system requirements and design, the qualification procedure undertaken on prototypes and the test results.

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Section: Requirements For Sensor Selectionmentioning

confidence: 93%

Design and R&D for MITICA thermal sensors

Palma

Pomaro

Maniero

et al. 2013

2013 IEEE 25th Symposium on Fusion Engineering (SOFE)

Self Cite

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“…An example of the radioactive inventory that can be found in operating plants is shown in Tables 5 and 6 from a study conducted for the NBI device [4], where D-D reactions occur, developed in Italy, and then used for ITER. Figures refer to different waiting times after the shutdown and the lower number of surviving radionuclides can be easily noticed in the second case.…”

Section: Activation Of Solidsmentioning

confidence: 99%

A Review of Radioactive Wastes Production and Potential Environmental Releases at Experimental Nuclear Fusion Facilities

et al. 2020

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The development of experimental nuclear fusion facilities and the systems connected to them currently involves the operation (or advanced design) of some large plants in the national territory. Devices such as neutron generators and plasma focus systems are also included. The machines developed to test the main components of these systems such as neutral beam generators (Neutral Beam Injector) and the experimental plants for thermonuclear fusion, mainly in the Tokamak configuration (toroidal geometry), are in the list. These applications are characterized by high neutron fluxes of high energy (typically 2.5 and 14 MeV from deuterium-deuterium and deuterium-tritium fusion reactions, respectively). They involve the production of radionuclides in the components of the machines and in the fluids used for targets’ cooling and in the primary containments. In many cases, the atmosphere of the rooms containing these structures is activated and may be affected by the dispersion of powders that are more or less radioactive. The present work addresses the issues mentioned so far, taking into consideration the real cases relating to the devices and the facilities in operation, under construction, and in the advanced design phase. The conclusions highlight the critical aspects related to the management of these types of waste, as well as the low or very low environmental impact, from a radiological point of view, of the examined facilities.

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Diagnostics of the ITER neutral beam test facility

Pasqualotto

Serianni

Sonato

et al. 2012

Review of Scientific Instruments

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The ITER heating neutral beam (HNB) injector, based on negative ions accelerated at 1 MV, will be tested and optimized in the SPIDER source and MITICA full injector prototypes, using a set of diagnostics not available on the ITER HNB. The RF source, where the H(-)∕D(-) production is enhanced by cesium evaporation, will be monitored with thermocouples, electrostatic probes, optical emission spectroscopy, cavity ring down, and laser absorption spectroscopy. The beam is analyzed by cooling water calorimetry, a short pulse instrumented calorimeter, beam emission spectroscopy, visible tomography, and neutron imaging. Design of the diagnostic systems is presented.

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Ionizing radiation compatibility in the MITICA neutral beam prototype

Cited by 6 publications

References 10 publications

Design and R&D for MITICA thermal sensors

Design and R&D for MITICA thermal sensors

A Review of Radioactive Wastes Production and Potential Environmental Releases at Experimental Nuclear Fusion Facilities

Diagnostics of the ITER neutral beam test facility

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Ionizing radiation compatibility in the MITICA neutral beam prototype

Cited by 6 publications

References 10 publications

Design and R&amp;D for MITICA thermal sensors

Design and R&amp;D for MITICA thermal sensors

A Review of Radioactive Wastes Production and Potential Environmental Releases at Experimental Nuclear Fusion Facilities

Diagnostics of the ITER neutral beam test facility

Contact Info

Product

Resources

About

Design and R&D for MITICA thermal sensors

Design and R&D for MITICA thermal sensors