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  • R M Mcdermott, B Lipschultz, J W Hughes, P J Catto, A E Hubbard, I H Hutchinson +9 others
  • 2009
High-resolution charge-exchange recombination spectroscopic measurements of B 5+ ions have enabled the first spatially resolved calculations of the radial electric field (E r) in the Alcator C-Mod pedestal region [E. offer new challenges for theory and simulation and provide for important comparisons with other devices. Qualitatively, the field structure(More)
The magnitude of plasma contact with main-wall surfaces is examined on the DIII-D poloidal divertor tokamak. A " window-frame " technique has been developed for axisymmetric surfaces to provide measurements of total plasma flux (ions/s) to the walls, I wall. Despite the use of a separatrix-wall gap that is 2-3 times the radial e-folding length of the plasma(More)
Mild psychological stressors provoke an acute rise in core temperature (T(C)), stimulate the hypothalamo-pituitary-adrenocortical (HPA) axis, and induce various stress-related behaviors. In the present study, we examined the effect of ablation of the anteroventral third ventricle region (AV3V) on both physiological and behavioral responses to a novel(More)
High-pressure noble gas jet injection is a mitigation technique which potentially satisfies the requirements of fast response time and reliability, without degrading subsequent discharges. Previously reported gas jet experiments on DIII-D showed good success at reducing deleterious disruption effects. In this paper, results of recent gas jet disruption(More)
The aim of this study was to simultaneously assess the changes in physiology, and kinematic and spatiotemporal features of gait, during prolonged load carriage in individuals without load carriage experience. Eleven males, representative of new military recruits, walked for 120 min at 5.5 km h(- 1), 0% grade, on a motorised treadmill while carrying a 22 kg(More)
The goal of the Lower Hybrid Current Drive (LHCD) system on the Alcator C-Mod tokamak is to investigate current profile control under plasma conditions relevant to future devices such as ITER and DEMO. Experimental observations of an LHCD " density limit " for C-Mod are presented in this paper. Bremsstrahlung emission from relativistic fast electrons in the(More)
Water intake and blood parameters of young (7-month) and old (23-month) male Brown Norway rats were assessed following a period of thermal dehydration. Rats of both ages were randomly assigned to one of three groups: (1) Unheated-blood sample, (2) Heated-blood sample, and (3) Heated-water intake. The colonic temperature of heated rats was raised at the rate(More)
An improved energy confinement regime, I-mode is studied in Alcator C-Mod, a compact high-field divertor tokamak using Ion Cyclotron Range of Frequencies (ICRF) auxiliary heating. I-mode features an edge energy transport barrier without an accompanying particle barrier, leading to several performance benefits. H-mode energy confinement is obtained without(More)
Core body temperature is maintained through a combination of physiological and behavioral effector mechanisms. While the neural pathways involved in autonomic responses to a heat stress are slowly being unraveled, those controlling behavioral responses have remained elusive. We have recently demonstrated that the tissue that surrounds the anteroventral(More)
The retention and recovery of hydrogen (H) and deuterium (D) fuel in the Alcator C-Mod tokamak are studied. C-Mod solely employs high-Z molybdenum (Mo) as its plasma-facing armor material, with intermittent application of thin boron (B) films. The C-Mod wall materials are found to retain large fractions, ~20-40%, of the D2 gas fuelled per shot, regardless(More)