5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P3.037 Experiences with the Segment Control system at Wendelstein 7-X operation

7 Sep 2016, 11:00
1h 20m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 37
Poster C. Plasma Engineering and Control P3 Poster session

Speaker

Heike Laqua (Wendelstein 7-X Operations (OP))

Description

Wendelstein 7-X (W7-X) is a superconducting stellarator undergoing the first experimental campaign after its commissioning. It’s characteristic feature is the steady state operation of the magnetic field. After an upgrade to cope with permanent heat loads of several Megawatts, W7-X will be able to run steady state discharges, too. This requires a control system that differs from the commonly used shot based systems. The W7-X control system supports all types of experiments compatible with steady state magnetic field operation, i.e. short plasma discharges and sequences of discharges with arbitrary time intervals. Moreover, it can handle plasma discharges of unlimited duration. This is achieved by dividing the experiment duration into time slices which are called “segments”. The use of segmented experiment programs helped cleaning the device by repetitive Electron Cyclotron Resonance power pulses with several discharges in one experiment. Using these features more than 1300 discharges have already been carried out during the first month of operation. The hierarchical layout of the control system reflects the structure of the experimental device. Each technical component and each diagnostic system including its data acquisition has its own segment control system permitting autonomous as well as co-ordinated operation. The activity of these devices is co-ordinated by a master controller during the experimental sessions. Component activities can be edited and tested by the component experts in parallel and later inserted into the main program. This allows generating complex experiment programs in a short time. All acquired data and reference values are time stamped using synchronised clocks of the Trigger Timer and Event (TTE) system. Diagnostics not yet fully integrated into the segment control system are synchronised by predefined triggers with TTE time stamps. This contribution will present the experiences with the flexibility of the W7-X Segment Control implementation.

Co-authors

Andreas Holtz (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Andreas Werner (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Anett Spring (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Christine Hennig (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Georg Kuhner (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Heike Laqua (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany;Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Heike Riemann (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Joerg Schacht (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Jon G. Krom (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Marc Lewerentz (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Martin Grun (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Michael Grahl (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany;Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany) Torsten Bluhm (Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany;Wendelstein 7-X Operations (OP), Max Planck Institut fuer Plasmaphysik, Teilinstitut Greifswald, Greifswald, Germany)

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