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  • 1
    Electronic Resource
    Electronic Resource
    A pellet ablation diagnostic system for the RFX reversed field pinch : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 616-618 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In view of the installation of a multiple pellet injector on the RFX experiment, an integrated diagnostic system has been designed to monitor the pellet behavior in the plasma. The evidence in the reversed field pinches (RFPs) of large poloidal and toroidal pellet deflections along magnetic field lines due to asymmetric ablation, calls for a 3D system with good space and time resolution. Two arrays of Hα detectors will view the trajectories of the pellets from below and from behind and a digital charged coupled device (CCD) camera will view the injection poloidal section from a tangential viewpoint. The two systems will allow the complete determination of the time-resolved trajectory of each pellet. The space integrated Hα emission rate will be measured by a large angle detector and by a space integration of the CCD camera measurement. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146304
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  • 2
    Electronic Resource
    Electronic Resource
    Upgrade of the RFX CO2 interferometer using in-vessel optics for extended edge resolution : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 694-697 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The extension to 16 chords of the eight-chord two-color MIR interferometer of the RFX reversed field pinch experiment (R=2 m, a=0.46 m) is presented. The new measurements are done through a 100 mm equatorial port with beams which are reflected back by corner cube metal mirrors mounted inside the vacuum vessel. Moreover, for four of the new chords, the beams are also steered by copper mirrors mounted inside the access pipe, whose edges are at 20–30 mm from the plasma surface. In this way measurements along lines of sight that are at a mean distance of 67 and 21 mm from the vessel first wall are possible. This results in a significant improvement of the density profile reconstruction towards the plasma edge. All the optics inside the vacuum vessel are fixed and the beam layout and focusing have been optimised to take in the misalignments due to the vacuum vessel thermal deformations. The system proved to work well despite mechanical vibrations as large as (approximate)1.5 mm at frequencies of (approximate)200 Hz. Stability of alignment and survival of the optics in the proximity of the plasma is also satisfactory. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147677
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  • 3
    Electronic Resource
    Electronic Resource
    Noncryogenic pellet injector for diagnostic purposes on the RFX reversed field pinch : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 939-942 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An impurity pellet injector is being developed for the RFX reversed field pinch (RFP) with three aims: measurement of the pitch of the magnetic field lines, transport studies, and first wall conditioning. The injector uses pneumatically accelerated metal sabots to launch the pellets. In this way the same barrel can be used for pellets of different sizes, speeds and materials. With drive pressures of 1–10 bars, velocities of 50–400 m/s can be obtained, which, based on code simulations, are adequate for core ablation. The measurement of the internal magnetic field will be done by diagnosing the direction of elongation of the pellet plasmoid using a masked charge coupled device camera capable of acquiring 28 images 40 lines×1024 pixels each with a maximum sampling rate of 50 kHz. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149290
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  • 4
    Electronic Resource
    Electronic Resource
    Three-dimensional time-resolved H pellet trajectory reconstruction in RFX by position sensitive detector Hα diagnostic : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 943-946 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Hydrogen pellets injected in reversed field pinches (RFPs) experience large poloidal and toroidal accelerations along magnetic field lines due to the rocket effect caused by asymmetric ablation processes. The 3D pellet trajectory and the global ablation rate is diagnosed in RFX by an absolutely calibrated multiple position sensitive detector (PSD) system looking at the Hα radiation coming from the pellet ablation cloud. The design of the diagnostic is presented. Then the performance is highlighted by cross-comparison between different PSD measurements and with time-integrated images from a CCD camera. Overall accuracy of the order of a few millimeters is achieved, which makes the instrument well-suited to assist transport studies (particle deposition), to estimate the radial profile of fast electron tails (derived from the modulus of pellet acceleration) and to obtain information on internal magnetic field pitch (from the direction of pellet acceleration). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149319
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  • 5
    Electronic Resource
    Electronic Resource
    Development of a vibration-compensated CO2 interferometer for the RFX experiment : Eighth topical conference on high—temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2885-2887 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The accuracy of a vibration-compensated CO2 interferometer is often worse than expected in the design phase. This paper describes a laboratory study performed during the development of a multichord two-color CO2 interferometer for the RFX experiment with the aim of assessing the performance of this diagnostic. The phase demodulation system (quadrature phase comparators and AGC linear IF amplifiers) has been carefully tested and a set of optimum conditions has been found for which its overall accuracy is better than 1°. Other sources of error such as noncompensated vibrations or standing waves in the acousto-optic cells have been sought for and studied on a test bench interferometer. A scheme is proposed by which density measurements with an accuracy better than 1018 m−2 can be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141815
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  • 6
    Electronic Resource
    Electronic Resource
    The summary database system for the RFX reversed field pinch experiment : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 526-528 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The RFX Summary Database System contains the most important experimental data, and provides tools to collect and insert the data and to interactively study their dependence. It was developed to allow a fast search for shots with given characteristics for follow-up, detailed shot analysis, and study of the scaling laws of the RFX plasmas. The database uses the Rdb/VMS relational database and is accessed using Structured Query Language syntax. A program automatically inserts the most important data for each shot while the users can access the database with their own programs using high-level routines. An Interactive Data Language interface to the database allows the users to interactively insert and extract data from the database, combine, or modify the data as they want, plot and fit the extracted or computed data, and perform general multiple regression analysis. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146338
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  • 7
    Electronic Resource
    Electronic Resource
    Real-time density computer for two-color interferometers : Eighth topical conference on high−temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2876-2878 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An electronic circuit has been developed which performs real-time density computation on the quadrature phase signals of the two-color CO2 interferometer for the RFX experiment. Cartesian to polar coordinate conversion is obtained by a look-up table, and a "phase fine tuning'' table allows us to introduce corrections to the systematic phase nonlinearity errors of the interferometer, by which the overall accuracy of the diagnostic is made better than 1°, equivalent to a line density of 6×1017 m−2 for a CO2 system. The phase total range is ±512 fringes and the maximum allowed rate of change is 125×103 m−2 s−1 equivalent to a density rate of change of 2×1025 m−2 s−1. A real-time signal proportional to the plasma density to be used for density feedback is provided by a 50 kHz, 12 bit converter. The system is a triple width CAMAC module and the two-color wavelength ratio is remotely programmable as a 20 bit constant, hence it is suitable in general for any two-color interferometer. The density data are also stored with a sampling rate of 10–250 kHz in a 128 K×24 bit memory buffer, which is interfaced via a CAMAC bus to the data acquisition system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141812
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  • 8
    Electronic Resource
    Electronic Resource
    Two-color CO2 interferometer with single Bragg cell and improved vibration compensation at 3.39 μm (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1571-1573 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A single-chord CO2 (10.6-μm) He–Ne (3.39-μm) two-color laser interferometer which has been developed for the ETA-BETA II RFP machine is presented. Compared to the usual 0.633-μm vibration compensation systems, the 3.39-μm interferometer allows faster optical path-length variations to be measured without losing fringes, can stand larger angular deflections of the beams (e.g., due to vibrations of the optic mounts) without losing alignment, and uses the same acousto-optic modulator as the CO2 system, thus minimizing the differences in the optical path of the two interferometers. The instrument has been extensively utilized on ETA-BETA II, where line density variations larger than 1020 m−2 and occurring in less than 4 μs can be routinely measured and the residual error after vibration compensation is ≈2×1018 m−2. Some further developments of the diagnostic are presented, which are presently underway or planned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140148
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  • 9
    Electronic Resource
    Electronic Resource
    An infrared vibration compensated interferometer for the MST experiment : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4999-5001 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The paper describes a two-color CO2/HeNe laser (10.6/3.4 μm) interferometer which has been designed and built at the IGI laboratory in Italy and installed on the MST Reversed Field Pinch (R=2 m, a=0.52 m, I=0.6 MA) at University of Wisconsin Madison. The system is very compact and is mounted on a 1.2×0.6 m wood board for a total weight of ≈60 kg. The infrared vibration compensation system allows us to use a one-window access (the beam is reflected back by a mirror mounted in the vacuum vessel) and to operate without a stiff mechanical structure embracing the machine. Several new features, such as the use of an interferometric local oscillator, the on-line calibration algorithm, and the four-passage scheme, allow a line-integral density accuracy of 1×1018 m−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143526
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  • 10
    Electronic Resource
    Electronic Resource
    A two color multichord infrared interferometer for RFX : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4996-4998 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A multichord interferometer designed for the Reversed Field experiment (RFX) (R=2 m, a=0.5 m, I=2 MA) is presented. The high density expected and the rather limited diagnostic access to the plasma motivated the choice of a two-color CO2/CO laser (10.6/5.4 μm) interferometer. Due to the time-varying magnetic fields ≥0.1 T around the torus entailed by the operation of the machine, the system has been mounted on a 3 ton graphite C-shaped optical table supported by a stainless steel structure on pneumatic vibration isolators. This led to long term stability of alignment and a very low level of mechanical vibrations. The interferometer can be moved in and out of the torus with ease by a carriage-rail system for maintenance both of the diagnostic and of the machine. The design foresees eight vertical chords spanning the arms of the C-shaped table and includes more additional measurements using a horizontal port and mirrors mounted inside the vacuum chamber. The expected accuracy in line density units is ≤1×1018 m−2, and the overall concept is that of a reliable system for high density and large size magnetic confinement plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143525
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