Prime pagine RA2010FUS:Copia di Layout 1 - ENEA - Fusione

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020 progress report 2010 Power (Linear amplitude) Power (Linear amplitude) 1.0 0.8 0.4 0 1.0 0.8 0.4 0 W tor =18.0 mm d in =800 mm W tor =20.8 mm d in =700 mm W tor =24.5 mm d in =600 mm a) -20 0 20 60 Probe position (mm) ν pol =19.2 mm d in =800 mm ν pol =22.1 mm d in =700 mm ν pol =27.6 mm d in =600 mm b) 0 20 40 60 80 Probe position (mm) Figure 1.18 – Output beam profiles in the toroidal a) and poloidal b) direction, obtained with the upper antenna (W is the beam radius in the toroidal and poloidal direction, respectively; d in is the input distance between the input beam waist and the focusing mirror). Dots correspond to the acquired data, curves to the Gaussian fit of the beam profile Vertical probe position (mm) 80 60 40 20 0 Power (dB) - angles: α=0°, β=0° Speed ref. motor 2 Speed ref. motor 1 MIRROR POSITION CONTROLLER (with real–time plasma ray tracing) Plasma feedback -20 0 20 20 60 Horizontal probe position (mm) Figure 1.19 – Beam amplitude pattern (dB) obtained from the upper antenna set in the reference configuration: contour levels are shown, where the –8.7 dB level corresponds to the definition of beam radius w PROTECTION SYSTEMS Alarm MOTOR 1 + DRIVE (speed and torque controller) MOTOR 2 + DRIVE (speed and torque controller) Position motor 1 Position motor 2 Figure 1.20 – Scheme of mirror control and protection systems coupling rods, to the external motors, put at the rear of the port. After these tests, a revision of the joints design was necessary. The new solution ensured better results in terms of the overall performances and reliability in the mechanical transmission of the movement, from the motor to the steering mirror unit. Low power tests were carried out after an optical alignment of the antenna, performed by using a laser mounted outside the port flange with beam aligned with the microwave beam axis and markers used to check the laser spot position on each mirror of the beam line. The tests have been made by using a 140 GHz horn–mirror antenna to launch a Gaussian beam matching a field close to the one measured at the aperture of the FTU transmission line. A vector network analyzer (VNA) was used to perform the tests, with a receiving antenna made with a properly shielded truncated waveguide. The upper and lower antennas output beams were measured. The beam zooming effect was verified by measuring the launched beam dimension (fig. 1.18) for different positions of the sliding mounting, and comparing them with the expected values. Also 2–D beam pattern measurements and 1–D scans were acquired, to evaluate the diffraction effects (fig. 1.19). The functionality of the brushless motors chosen for the last steering mirror movement, was tested in presence of an external magnetic field (B MAX =0.1 T) estimated at the location foreseen for the motors in the FTU hall, in real conditions of typical plasma operations. A 3–D model provides maps of the local value of the stray field surrounding FTU during the shot (fig. 1.20). Such a model gave a maximum of ≈0.058 T for the stray magnetic field expected at the motors location during typical plasma discharges. A permanent magnetic field source, able to produce 0.1 T as a maximum field in correspondence of the poles and 0.05 T in the air gap, was used for dynamical tests: they confirmed that such an external stray magnetic field does not affect the correct operations of either the brushless motors or the resolver system. The control and protection systems (shown in fig. 1.20 for one mirror) were tested in order to identify the parameters of the drive and the mechanical system. Several tests have been repeated with this open-loop configuration, with and without any mechanical load. In particular, the tests aimed to acquire the system step response, so the speed reference input was a step with finite length; different step amplitudes have been used to test the linearity of the system (fig. 1.21). The responses obtained showed that the non–linearity is not
magnetic confinement (cont’d.) progress report 2010 021 relevant. Simulation results, together with the speed controller response verified experimentally, seem to confirm that the target specifications can be achieved. Liquid lithium experiments Pellet injection in lithized wall discharges. High density discharges were obtained through the first successful injections of D 2 pellets in presence of a significant wall lithization. Density profiles, for transport analysis, were obtained from the inversion of the FTU CO 2 scanning interferometer [1.12], which is a very powerful tool for studying fast evolution of density profiles and very strong gradients. Density profiles were taken every 62.5 μs with a spatial resolution of 1 cm and a line integrated density resolution Δn¯e/n¯e∼2%. After a prompt increase in central density, typical of pellet fuelled discharges, a further peaking is observed following the first pellet, which suggests the existence of an inward pinch, as seen also in gas fuelled discharges (figs. 1.22 and 1.23). A fully interpretative transport analysis of the density profile decay (1st pellet) has been performed in the region where there are no particle sources upon completion of pellet ablation (r/a
Page 1 and 2: PROGRESS REPORT Euratom-ENEA Associ
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112 progress report 2010 J. DECKER,
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Organization Chart The activities o
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Abbreviation and Acronyms A ac ACCC
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126 progress report 2010 GEM GRS GS
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128 progress report 2010 TF TF TFC
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