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  • Cryolines | Another day, another spool

    Having wedged his body and equipment into the cramped space between the ceiling and the massive pipe, a worker is busy welding two cryolines spools. A few metre [...]

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  • Image of the week | Bearings unveiled

    The construction teams are in the last stages of preparing the Tokamak pit for the first major operation of ITER machine assembly: the lowering of the cryostat [...]

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  • Technology | Perfecting tritium breeding for DEMO and beyond

    While ITER will never breed tritium for its own consumption, it will test breeding blanket concepts—the tools and techniques that designers of future DEMO react [...]

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  • Fusion world | Japan and Europe complete the assembly of JT-60SA

    The JT-60SA fusion experiment in Naka, Japan, is designed to explore advanced plasma physics in support of the operation of ITER and next-phase devices. After s [...]

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  • Manufacturing | Thermal shield milestone in Korea

    Six years after the start of fabrication, Korean contractor SFA has completed the last 40° sector of vacuum vessel thermal shield. The stainless steel panels, c [...]

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Of Interest

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SPIDER's power supply and calorimeter signed off

Shishir P. Deshpande, Head of the Indian Domestic Agency, after the signature with his team: Ujjwal K. Baruah, Chandramoulli Rotti, Narinder P. Singh, Dilshad A. Sulaiman, Aruna M. Thakar and KGV Nair. (Click to view larger version...)
Shishir P. Deshpande, Head of the Indian Domestic Agency, after the signature with his team: Ujjwal K. Baruah, Chandramoulli Rotti, Narinder P. Singh, Dilshad A. Sulaiman, Aruna M. Thakar and KGV Nair.
This week, the Procurement Arrangement for the 100 kV power supply of the SPIDER test facility and calorimeter was signed by Shishir Deshpande, the Head of the Indian Domestic Agency. ITER Director-General Osamu Motojima signed the contract on 10 December.

SPIDER is the source for Production of Ion of Deuterium Extracted Radio Frequency plasma. SPIDER—together with MITICA (Megavolt ITER injector & Concept Advance)—comprise the PRIMA facility that is also known as the neutral beam test facility. PRIMA will be located in Padua, Italy.

The two main functions of SPIDER's calorimeter are to intercept the negative ion beam inside the vacuum vessel, and to measure the thermal loads for beam diagnostic. (Click to view larger version...)
The two main functions of SPIDER's calorimeter are to intercept the negative ion beam inside the vacuum vessel, and to measure the thermal loads for beam diagnostic.
On the full size neutral beam test facility, components and subsystems for ITER's powerful neutral beams will be tested and developed. For example, it will test the ITER injector at full power and pulse length, thus establishing all the methods and procedures needed to fully commission the injectors on ITER, independently of ITER, using the built-in calorimeter.

The main objective of the SPIDER test bed is to optimize, as far as possible, the performance of the full ITER size ion source at full extracted current, at full pulse length with a source uniformity within ±10 percent and in hydrogen and deuterium operation.

The calorimeter consists of two actively cooled panels composed of axial arrays of hypervapotron elements; the coolant manifolds and flexible hydraulic connections; two panel support frames to support the hypervapotron elements allowing free thermal deformations of the hypervapotron elements; and a beam dump support structure for connection to the front lid of the SPIDER vacuum vessel. (Click to view larger version...)
The calorimeter consists of two actively cooled panels composed of axial arrays of hypervapotron elements; the coolant manifolds and flexible hydraulic connections; two panel support frames to support the hypervapotron elements allowing free thermal deformations of the hypervapotron elements; and a beam dump support structure for connection to the front lid of the SPIDER vacuum vessel.
The SPIDER power supply system shall provide the electric power to the SPIDER accelerator grids and shall supply the SPIDER ion source and the auxiliary components. A section of the SPIDER power supply system, called the -100 kV power supply, shall be capable of voltage regulation and of switch off in case of grid breakdown.


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