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  • Tandem collimators for the JET tangential gamma-ray spectrometer
    Soare, S. ...
    Gamma-ray emission of tokamak plasmas is the result of the interaction of fastions (fusion reaction products, including alpha particles, NBI ions, ICRH-accelerated ions) with main plasma impurities ... (e.g., carbon, beryllium). Gamma-ray diagnostics involve both gamma-ray imaging (cameras) and gamma-ray spectrometry (spectrometers). For the JET tokamak, gamma-ray diagnostics have been used to provide information on the characteristics of the fast ion population in plasmas š1đ and š2đ. The applicability of gamma-ray diagnostics to high performance deuterium and deuterium-tritium JET discharges is stronglydependent on the fulfillment of rather strict requirements for the definition and characterization of the neutron and gamma radiation fields (detector field of view, radiation shielding and attenuation, parasitic gamma-ray sources). The JET tangential gamma-ray spectrometer (TGRS) has a horizontal (quasi-tangential) line of sight that crosses the JET plasma from the octant 8 vacuum port to the octant 3 vacuum port. The TGRS diagnostics uses a calibrated bismuth germanate (BGO) scintillation detector which has a diameter of 75 mm and a height of 75 mm. It is located in a shielded bunker, behind the high resolution X-ray crystal spectrometer (the KX1 X-ray spectrometer). It is estimated that the BGO detector line of sight lies in a horizontal plane about 30 cm below the JET plasma magnetic axis.
    Source: Proceedings of the 26th SOFT 2010, 26th Symposium on Fusion Technology, September 27 - October 1, 2010, Porto, Portugal (Iss. 6-8, Vol. 86, 2011, str. 1359-1364)
    Type of material - conference contribution
    Publish date - 2011
    Language - english
    COBISS.SI-ID - 25787687

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