Ultrahigh Densities and Volume Recombination inside the Separatrix of the Alcator C-Mod Tokamak
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Dissipative Divertor Operation in the Alcator C-mod Tokamak Dissipative Divertor Operation in the Alcator C-mod Tokamak
The achievement of large volumetric power losses (dissipation) in the Alcator C-Mod divertor region is demonstrated in two operational modes: radiative divertor and detached divertor. During radiative divertor operation, the fraction of SOL power lost by radiation is P R/PSOL0.8 with single null plasmas, n e < 2x10 20 m-3 and I < 1 MA. These plasmas sometimes have very high recycling, with nedi...
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Atomic molybdenum influxes in the Alcator C-Mod tokamak have been monitored using visible spectroscopy. Measured source rates from the outer divertor, the largest source location, are compared to rates calculated from a standard physical sputtering model utilizing divertor Langmuir probe data. Comparison of the sputtering model with the measured molybdenum source rate shows good agreement durin...
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1 Recent breakthroughs in silicon detector technology now permit measurement of radiated power over a wide range in photon energies. These detectors also known as AXUV photodiodes have a at spectral power response from ultraviolet to X-ray energies, and with a slightly reduced ef-ciency all the way d o wn to visible wavelengths. Since they can be made small, multi-channel detectors allow high s...
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A pellet enhanced performance (PEP) mode, showing significantly reduced core transport, is regularly obtained after the injection of deeply penetrating lithium pellets into Alcator C-Mod discharges. These transient modes, which typically persist about two energy confinement times, are characterized by a steep pressure gradient (p <; a/5) in the inner third of the plasma, indicating the presence...
متن کاملIdentification of Mercier Instabilities in Alcator C-mod Tokamak
During current ramp-up discharges, highly localized magnetohydrody-namic (MHD) fluctuations were observed on the electron cyclotron emission (ECE) diagnostics of Alcator C-Mod tokamak [I. The electron temperature profile was hollow, while the density profile was weakly decreasing. Assuming that the equilibration time was short enough to quickly thermalize ions the pressure profile was also foun...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1998
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.81.1007