Speaker
Alexey Arkhipov
(Max-Planck Institute for Plasma Physics)
Description
The ITER Diagnostic Pressure Gauges (DPG) shall provide the measurement of the neutral gas pressure, which is an important parameter for basic control of the operation of ITER machine as well as for input to physics models of the plasma boundary. The reference sensor is a hot cathode ionization gauge, which is able to operate in an environment with strong magnetic fields (up to 8 Tesla), strong and noisy background signals and fast pressure changes. In total 52 DPG sensor heads will be installed in 4 lower ports, 4 divertor cassettes and 2 equatorial ports.
The DPG system is currently being developed by IPP in collaboration with F4E and Sgenia within a FPA. As part of the system level design (SLD) activities several different architectures of the DPG system, including gauge head and supporting electronic equipment, have been evaluated in detail with the aim to fulfil technical requirements imposed by the integration in ITER. Design solutions developed during the SLD phase have been supported by dedicated modelling activities, which allowed assessing the impact of loads and system performance. As a result of evaluating the proposed architecture options it was decided to choose for the baseline design a system based on the technology of the ASDEX pressure gauge with the addition of implementing a thermocouple for precise calibration, implementing a baffle for thermalizing fast neutrals and optimizing the electronic equipment according to space availability inside the ITER complex, while reducing cable lengths as much as possible. For this option risk and RAMI analyses were carried out leading to the identification of 130 risks and a mitigation plan for the critical ones. Also, for the minimal operation scenario an availability of the diagnostic of 99% for the life-time of ITER was found.
Co-authors
Alexey Arkhipov
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Andrea Scarabosio
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Fabien Seyvet
(Fusion for Energy, Barcelona, Spain)
Felix Mackel
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Guenter Haas
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Guillermo Roman
(Sgenia Solutions, Madrid, Spain)
Hans Meister
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Juergen Koll
(Max-Planck Institute for Plasma Physics, Garching, Germany)
Oscar Paz
(Sgenia Solutions, Madrid, Spain)
Philip Andrew
(ITER Organization, Cadarache, France)
Santiago Terron
(Fusion for Energy, Barcelona, Spain)
