Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • A world in itself

    From a height of some 50 metres, you have the entire ITER worksite at your feet. The long rectangle of the Diagnostics Building stands out in the centre, with [...]

    Read more

  • US completes toroidal field deliveries for ITER

    The US Domestic Agency achieved a major milestone in February by completing the delivery of all US-supplied toroidal field conductor to the European toroidal fi [...]

    Read more

  • Thin diagnostic coils to be fitted into giant magnets

    Last week was marked by the first delivery of diagnostic components—Continuous External Rogowski (CER) coils—from the European Domestic Agency to the ITER Organ [...]

    Read more

  • Addressing the challenge of plasma disruptions

    Plasma disruptions are fast events in tokamak plasmas that lead to the complete loss of the thermal and magnetic energy stored in the plasma. The plasma control [...]

    Read more

  • Blending (almost) seamlessly into the landscape

    Located in the foothills of the French Pre-Alps, the ITER installation blends almost seamlessly into the landscape. The architects' choice ofmirror-like steel c [...]

    Read more

Of Interest

See archived articles

Development of ITER's Diagnostic Neutral Beam

-Arun K. Chakraborty and Indranil Bandyopadhyay, ITER India

Technicians are seen busy in providing the final installations of 50 kV electrical isolators for the assembly housing the gas feed system.<br /><br /> (Click to view larger version...)
Technicians are seen busy in providing the final installations of 50 kV electrical isolators for the assembly housing the gas feed system.

ITER India is responsible for the procurement of the Diagnostic Neutral Beam (DNB), which will play the very important role of helping to detect the amount of helium ash inside of the ITER Tokamak. It will do so through charge exchange spectroscopy (CXRS), which is a measure of the efficiency of the fusion reactions in the device.
 
The DNB will consist of a negative ion source-based neutral beam of hydrogen atoms with 100keV of energy and 17-20A of beam current with a divergence not exceeding ~7millirad. India has already signed the Procurement Arrangement (PA) for delivering the DNB. At present, the detailed engineering design and R&D for the DNB system is ongoing.
 
A dedicated assembly group have participated with infectious enthusiasm in the assembly and integration of the injector. (Click to view larger version...)
A dedicated assembly group have participated with infectious enthusiasm in the assembly and integration of the injector.
Strong support for the development of the DNB system will be provided by the ongoing activities in the domestic neutral beam program, such as the positive ion-based injector that is mandated to deliver about 1.7 MW of NB power to the SST-1 Tokamak under steady state conditions (1000s). This activity has been strongly supported by the Indian industries involved in development of technologies related to electrical and mechanical engineering hardware - many of them state-of-the-art. A dedicated assembly group has participated with infectious enthusiasm in the assembly and integration of the injector.

The complex task is performed by a set of controllers which are integrated through fiber optic or hard wired cabling. (Click to view larger version...)
The complex task is performed by a set of controllers which are integrated through fiber optic or hard wired cabling.
The first quarter of 2010 witnessed the campaign for the first phase of operation of an integrated system with the 5 MW ion source. Technicians are busy providing the final connections to the filaments and carrying out the final installations of 50 kV electrical isolators for the assembly housing the gas feed system.

The success in operating ion sources can be largely attributed to effective control of the discharge current. This complex task is performed by a set of controllers that are integrated through fibre optic or hard wired cabling. The positive ion injector is now in its final stages of integration with the cryosystem and will soon be available to the engineers for the commissioning of a full power beam.

Final connecting works to the filaments. (Click to view larger version...)
Final connecting works to the filaments.
In parallel, a negative ion source R&D program has also been undertaken at the Institute for Plasma Research (IPR), with the goal of successfully operating the BATMAN type RF ion source at IPR for operation, training and physics experiments. Up to 100 kW of RF power can be coupled to the source to produce ~10 A of —ve ion beam in hydrogen at an accelerating voltage of ~ 25 kV. An engaged team of technicians is currently performing the pre-commissioning integration checks on the RF integration, pre-integration checks for vacuum sub-assemblies and integration of control systems.
 
The plasma source has just been commissioned with 85 kW of RF power coupled to the plasma. The program will be expanded to include creation of facilities for tests of larger sources, ultimately converging towards the commissioning of a test facility in India for R&D of the ITER-DNB system to address the complex physics and technology aspects of the NB systems.


return to the latest published articles