Study on the divertor plasma behavior through sweeping strike point in the new lower divertor on EAST

Abstract A series of L-mode discharges have been conducted in the new ‘corner slot’ divertor on the Experimental Advanced Superconducting Tokamak (EAST) to study the divertor plasma behavior through sweeping strike point. The plasma control system controls the strike point sweeping from the horizontal target to the vertical target through poloidal field coils, with keeping the main plasma stability. The surface temperature of the divertor target cools down as the strike point moves away, indicating that sweeping strike point mitigates the heat load. To avoid the negative effect of probe tip damage, a method based on sweeping strike point is used to get the normalized profile and study the decay length of particle and heat flux on the divertor target λ js , λ q .In the discharges with high radio-frequency (RF) heating power, electron temperature T e is lower and λ js is larger when the strike point locates on the horizontal target compared to the vertical target, probably due to the corner effect. In the Ohmic discharges, λ js , λ q are much larger compared to the discharges with high RF heating power, which may be attributed to lower edge T e .

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Upgrade of poloidal field coils current measurement system on Experimental Advanced Superconducting Tokamak

Fusion Engineering and Design ◽

10.1016/j.fusengdes.2019.111264 ◽

2019 ◽

Vol 148 ◽

pp. 111264 ◽

Cited By ~ 1

Author(s):

M.M. Xue ◽

D.L. Chen ◽

B. Shen ◽

Y. Wang ◽

T.H. Shi ◽

...

Keyword(s):

Measurement System ◽

Current Measurement ◽

Poloidal Field ◽

Superconducting Tokamak

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Investigation on the Mechanism of Heat Load Reduction for the Thermal Anti-Icing System

Energies ◽

10.3390/en13225911 ◽

2020 ◽

Vol 13 (22) ◽

pp. 5911

Author(s):

Rongjia Li ◽

Guangya Zhu ◽

Dalin Zhang

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Convective Heat ◽

Power Distribution ◽

Water Droplet ◽

Heat Load ◽

Convective Heat Transfer Coefficient ◽

Heating Power ◽

Load Reduction ◽

Optimal Heating

The aircraft ice protection system that can guarantee flight safety consumes a part of the energy of the aircraft, which is necessary to be optimized. A study for the mechanism of the heat load reduction in the thermal anti-icing system under the evaporative mode was presented. Based on the relationship between the anti-icing heat load and the heating power distribution, an optimization method involved in the genetic algorithm was adopted to optimize the anti-icing heat load and obtain the optimal heating power distribution. An experiment carried out in an icing wind tunnel was conducted to validate the optimized results. The mechanism of the anti-icing heat load reduction was revealed by analyzing the influences of the key factors, such as the heating range, the surface temperature and the convective heat transfer coefficient. The results show that the reduction in the anti-icing heat load is actually the decrease in the convective heat load. In the evaporative mode, decreasing the heating range outside the water droplet impinging limit can reduce the convective heat load. Evaporating the runback water in the high-temperature region can lead to the less convective heat load. For the airfoil, the heating power distribution that has an opposite trend with the convective heat transfer coefficient can reduce the convective heat load. Thus, the optimal heating power distribution has such a trend that is low at the leading edge, high at the water droplet impinging limit and zero at the end of the protected area.

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Poloidal Field Power Supply Systems for the HT-7U Steady-State Superconducting Tokamak

Fusion Science & Technology ◽

10.13182/fst02-a223 ◽

2002 ◽

Vol 42 (1) ◽

pp. 155-161 ◽

Cited By ~ 15

Author(s):

P. Fu ◽

Z. Z. Liu ◽

J. Z. Xu ◽

G. Gao ◽

J. L. Wen ◽

...

Keyword(s):

Steady State ◽

Power Supply ◽

Poloidal Field ◽

Supply Systems ◽

Superconducting Tokamak

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Effect of Summer Annual Forage and Type of Shade on Grazing Behavior of Beef Stocker Heifers

Journal of Agricultural Science ◽

10.5539/jas.v8n10p15 ◽

2016 ◽

Vol 8 (10) ◽

pp. 15

Author(s):

Guillermo Scaglia

Keyword(s):

Beef Cattle ◽

Pearl Millet ◽

Heat Load ◽

Bos Taurus ◽

Pennisetum Glaucum ◽

Time Of Day ◽

Negative Effects ◽

Grazing Behavior ◽

Negative Effect ◽

Forage Type

Heat stress in beef cattle is still one of the issues affecting animal performance in the beef cattle industry. Our objective was to evaluate the effect of two summer annual forages such as alyceclover (Alysicarpus vaginalis L.), and pearl millet (Pennisetum glaucum) with natural (trees) or artificial shade (80% shade) on grazing behavior and on reducing the heat load of crossbred yearling heifers. On three consecutive years from mid-July to mid-September, 36 (Bos taurus × B. indicus) heifers (body weight [BW] = 321±11.3 kg) were randomly allotted (n = 3) and continuously stocked in 12-1.33 ha paddocks in a 2 × 2 factorial arrangement of treatments (2 forage types and 2 shade types) with three replicates. Heifers grazing on alyceclover gained more (p = 0.03) than those grazing pearl millet (0.94 and 0.80 kg, respectively). Grazing behavior variables were not affected (p > 0.05) by forage type and forage type x shade type interaction; however, shade type affected grazing and lying time (p < 0.05). Time of day (TOD) affected (p < 0.05) grazing and standing time, number of steps taken, respiration rate, and panting scores. These negative effects are related with the greatest temperature humidity index between 1100 and 1459 h. When data were analyzed by TOD, the negative effect on grazing behavior variables was not different for heifers with access to natural or artificial shades. Under the conditions of the present experiment, artificial shade provided protection for cattle. Grazing behavior parameters can be used to monitor heat load in grazing cattle.

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Effects of heating power on divertor in-out asymmetry and scrape-off layer flow in reversed field on Experimental Advanced Superconducting Tokamak

Physics of Plasmas ◽

10.1063/1.4904205 ◽

2014 ◽

Vol 21 (12) ◽

pp. 122514 ◽

Cited By ~ 3

Author(s):

S. C. Liu ◽

H. Y. Guo ◽

L. Wang ◽

H. Q. Wang ◽

K. F. Gan ◽

...

Keyword(s):

Heating Power ◽

Reversed Field ◽

Layer Flow ◽

Superconducting Tokamak

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Analysis of Influencing Factors of Heat Load of Heating Power Station

E3S Web of Conferences ◽

10.1051/e3sconf/202125201042 ◽

2021 ◽

Vol 252 ◽

pp. 01042

Author(s):

Yu Lu ◽

Rui Li

Keyword(s):

Influencing Factors ◽

Heat Load ◽

Load Forecasting ◽

Heating System ◽

Heating Power ◽

Power Station ◽

System Planning ◽

Factors Affecting ◽

Heating Load ◽

Selection Of

Heating system load forecasting is very important in heating system planning and formulating heating plans. More accurate load forecasting can obtain greater economic and social benefits for the heating power station. The selection of influencing factors affecting heating load forecasting has a decisive effect on the accuracy of load forecasting. Based on the analysis of heat load of typical heating power station, this paper compares and analyses the influence of outdoor temperature, wind speed and load of previous days, etc. The main factors that should be considered in heating load forecasting are obtained.

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