Descripción de la contratación
The scope will include:
— manufacture to build-to-print specifications of components and assemblies,
— supply of COTS or customised items (to functional specifications),
— calibration of sensors in dedicated facilities,
— factory acceptance testing,
— cleaning, packing and shipping.
For the following diagnostics:
— Radial Neutron Camera (RNC),
— Core-plasma Charge-Exchange Recombination Spectrometer (CXRS Core),
— Core-Plasma Thomson Scattering (CPTS),
— bolometers,
— Diagnostic Pressure Gauges (DPGs),
— RNC is a port-based diagnostic measuring neutrons produced by fusion reactions in the ITER plasma. It uses an array of neutron flux detectors located at the rear of collimators; channels through massive radiation shielding which define narrow regions of the plasma from which the neutrons are collected,
— CPTS is a port-based optical diagnostic measuring the electron temperature and density profiles across the core of the ITER plasma. It delivers light from a powerful laser into the plasma, where a small fraction is scattered from electrons (Thomson scattering). The scattered light is transmitted by a series of mirrors, lenses and a fibre optic bundle to a set of polychromators for detection,
— CXRS Core is another port-based optical diagnostic, in this case measuring the ion temperature, plasma rotation velocity and impurity concentration profiles across the core of the ITER plasma. CXRS Core analyses light emitted due to ´charge exchange´ interactions between hydrogen neutral particles from the ITER diagnostic neutral beam (DNB) and impurity ions in the ITER plasma. The charge exchange light is transmitted by a series of mirrors, lenses and a fibre optic bundle to a set of spectrometers for detection,
— the Bolometer diagnostic measures the total radiated power from the ITER plasma and its spatial distribution in the wavelength range from infrared to soft x-ray using sensors that detect the change in temperature of a thin absorbing surface using a sensitive thermistor. An array of around 500 sensors is integrated into around 50 Bolometer ‘camera’ structures that provide collimation, mechanical support and electrical connections. The cameras are distributed around the plasma: on the vacuum vessel, in the port plugs and on the Divertor Cassettes,
— the DPGs measure the pressure of neutral gas in the ITER Vacuum Vessel by measuring ions generated in the gas by an electron source. Electrons from the source are accelerated by an electric potential into the gas and the ions formed are drawn by a second potential towards a collector. The source, grid and collector are mounted on a structure providing mechanical support and electrical connections. There are around 50 DPGs mounted on the vacuum vessel, in the port plugs and on the Divertor Cassettes.
The scope includes most of the components and assemblies for the RNC, CPTS CXRS, Bolometer and DPG diagnostic systems, with a few exceptions (e.g. control, conditioning and data acquisition electronics, one type of neutron flux detector and the DNB). Deliveries are foreseen to begin in 2025, corresponding to ITER Second Plasma and beyond. Adherence to schedule and good project management will be of the upmost importance in managing the range of systems and components. Quality requirements will also be demanding. Additionally, several systems include protection important components and activities which due to their nuclear safety function need to be manufactured to a very high standard, following appropriate defined requirements and codes/standards.
There will be 50–80 distinct, complex sub-assemblies provided under F4E OMF 1244; as well as many independent, highly specialised components, customised items, supply of COTS and calibration of sensors. Several of the assemblies will be manufactured in quantities of more than 10 units, some with slight variations (e.g., DPGs, Bolometers). Many components and sub-assemblies will be required to operate in UHV conditions.