README file for Myers et al. Nucl. Fusion paper titled, “A multi-machine scaling
of halo current rotation.”

Each figure has an accompanying PDF of the figure itself and an HDF5 file of the
archived figure data.  The contents of each HDF5 file are described below.

Only data from U.S. machines (C-Mod, DIII-D, NSTX) are archived. The EU machines
(AUG, JET) do not permit the public archiving of data at this time.

Figure 1: Halo current sensor array diagrams
    • Schematic only. No data to archive.

Figure 2: Sample disruption current quench analysis
    • These data are from DIII-D Shot 93199.
    • panel_a
        • Ip = Plasma current time and data waveforms [s, kA].
        • tD = Time of the disruption [s].
        • IpD = Plasma current at the time of the disruption [kA].
        • tspike = Time of the current spike [s].
        • t80 = Time when Ip equals 80% of IpD [s].
        • t20 = Time when Ip equals 20% of IpD [s].
        • tCQ = Shot-specific current quench time (duration) [s].
    • panel_b
        • dIpdt = Plasma current derivative time and data waveforms [s, MA/s].
        • dIPdt_threshold = Threshold for disruption detection [MA/s].
    • panel_c
        • Ihalo_RMS = RMS halo current time and data waveforms [s, kA].

Figure 3: Current quench times sorted by machine
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • tCQ_pts = Current quench times [ms].
        • xpts = Histogram-like x values [arbitrary].

Figure 4: Normalized current quench times sorted by machine
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • tCQ_pts = Normalized current quench times [ms/m^2].
        • xpts = Histogram-like x values [arbitrary].

Figure 5: Sample halo current rotation analysis
    • panel_a
        • Ihalo = 2D halo current data [time x toroidal phase, phi]
            • time = [normalized time units].
            • phi = toroidal phase [degrees].
        • phase = halo current phase (h2)
            • time = [normalized time units].
            • data = phase (h2) [degrees].
        • phi_sensor = toroidal locations of the sensors [degrees].
        • asymmetry_interval_limits = [normalized time units].
    • panel_b
        • h0 = Fitted n=0 amplitude time and data [normalized time units, kA].
        • h1 = Fitted n=1 amplitude time and data [normalized time units, kA].
        • h1_threshold = Asymmetry threshold [kA].
        • tau_min = Minimum dwell time for asymmetry [normalized time units].
        • asymmetry_interval_limits = [normalized time units].
    • panel_c
        • vh = Rotation velocity time and data [normalized time units, km/s].
        • vh_threshold = Rotation threshold [km/s].
        • tau_min = Minimum dwell time for rotation [normalized time units].
        • rotation_interval_limits = [normalized time units].
    • panel_d
        • Nrot = Rotation count time and data [normalized time units, none].
        • rotation_interval_limits = [normalized time units].

Figure 6: Samples of halo current rotation by machine
    • Three samples are included:
        • CMod_950125019_PartRog
        • DIIID_93221_Row11
        • NSTX_139617_Row3
    • Each sample has the same contents as panel_a of Figure 5.

Figure 7: Halo current polarity versus toroidal field
    • Entries for the inboard (IBD) and outboard (OBD) sensors are included.
    • Each entry includes Ih and BT data separated by machine:
        • BT_pts = toroidal field [T].
        • Ih_pts = peak RMS halo current [kA].

Figure 8: Halo current rotation versus plasma current
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • Ip_pts = Signed plasma current [MA].
        • Nrot_pts = Signed rotation count [none].

Figure 9: Halo current rotation duration versus current quench duration
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • tCQ_pts = Shot-specific current quench duration [ms].
        • trot_pts = Halo current rotation duration [ms].

Figure 10: Halo current rotation duration scaling
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • trot_data = Experimental measurements of trot [ms].
        • trot_fit = Least-squares fitted trot values [ms].
    • The ITER subfolder contains the four x-y vertices of the projection

Figure 11: Normalized halo current rotation duration by machine
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • trot_pts = Normalized rotation duration [trot / tauCQ].
        • xpts = Histogram-like x values [arbitrary].

Figure 12: Halo current rotation frequency scaling
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • favg_data = Experimental measurements of rotation frequency [Hz].
        • favg_fit = Least-squares fitted rotation frequency values [Hz].
    • The ITER subfolder contains the four x-y vertices of two projections:
        • shaded = projection if C(eta^-1) = 1.2
        • unshaded = projection if C(eta^-1) = 4.2

Figure 13: Halo current rotation velocity by machine
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • vavg_pts = Halo current rotation velocity [km/s].
        • xpts = Histogram-like x values [arbitrary].

Figure 14: Rotation count versus rotation duration parameter space
    • Subfolders for C-Mod, DIII-D, and NSTX each contain:
        • trot_pts = Rotation duration data points [ms].
        • Nrot_pts = Unsigned rotation count data points [none].
        • scaling_vertices_shaded = projection using machine-specific C(eta^-1)
    • The ITER subfolder contains the four x-y vertices of two projections:
        • shaded = projection if C(eta^-1) = 1.2
        • unshaded = projection if C(eta^-1) = 4.2