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Abstract
Using a single toroidal array of coils to reduce the m,n=2,1 resonant error field produced by the misalignment of the axisymmetric coils in SPARC can result in the enhancement of the local divertor heat fluxes. Managing high divertor heat fluxes (q∥ ≈ 10 GW/m2) poses a challenge for compact tokamak devices such as SPARC. The presence of non-axisymmetric magnetic field perturbations adds complexity to the problem by generating intricate 3D edge magnetic topologies that alter the heat flux distributions on the target plates.
The aim of this work is to investigate the impact of the error field correction (EFC) on the heat fluxes at the divertor plates in SPARC. The MHD code M3DC1 has been used to simulate the 3D magnetic perturbations generated by the shift and tilt of several axisymmetric coils within specified tolerances, as well as from the array of error field correction coils located at the midplane. Using a heuristic model that extends the concept of an axisymmetric heat flux layer to 3D plasmas, the resultant heat flux distributions is derived from magnetic footprints calculated with the MAFOT code. The results show that the EFC could either decrease or further enhance the local heat flux when used to correct the m,n=2,1 resonant error field to enhance the core plasma performance.- Book : ()
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2025
We present seeing-limited ( arcsecond ) near-infrared integral field spectroscopy data of the type-2 quasars, QSO2s, SDSS J135646.10+102609.0 (J1356) and SDSS J143029.89+133912.1 (J1430, the Teacup), both belonging to the Quasar Feedback, QSOFEED, sample. The nuclear K-band spectra (1.95-2.45 m) of these radio-quiet QSO2s reveal several emission lines, indicative of the presence of a warm molecular gas reservoir (T≥1000 K). We measure nuclear masses of rm H_2 =5.9, 4.1, and $1.5 in the inner arcsecond diameter region of the Teacup (∼1.3 kpc), J1356 north (J1356N), and south nuclei (∼1.8 kpc), respectively. The total warm mass budget is ∼ 4.5 in the Teacup and ∼ 1.3 in J1356N, implying warm-to-cold molecular gas ratios of 10^-6. The warm molecular gas kinematics, traced with the and S(2) emission lines, is consistent with that of the cold molecular phase, traced by ALMA CO emission at higher angular resolution ( arcsecond and arcsecond ). In J1430, we detect the blue- and red-shifted sides of a compact warm molecular outflow extending up to 1.9 kpc and with velocities of 450 In J1356 only the red-shifted side is detected, with a radius of up to 2.0 kpc and velocity of 370 The outflow masses are 2.6 and 1.5times 10^3 for the Teacup and J1356N, and the warm-to-cold gas ratios in the outflows are 0.8 and 1 times implying that the cold molecular phase dominates the mass budget. We measure warm molecular mass outflow rates of 6.2 and 2.9 times 10^ for the Teacup and J1356N, which are approximately 0.001% of the total mass outflow rate (ionized + cold and warm molecular). We find an enhancement of velocity dispersion in the residual dispersion map of the Teacup, both along and perpendicular to the compact radio jet direction. This enhanced turbulence can be reproduced by simulations of jet-ISM interactions.- Book : ()
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