Mechanics of ELM control coil induced fast particle transport in ITER

Särkimäki, Konsta; Varje, J.; Bécoulet, M.; Liu, Yueqiang; Kurki-Suonio, T.

doi:10.1088/1741-4326/aac393

Cited by 20 publications

(30 citation statements)

References 20 publications

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“…We have done a preliminary comparison between the response given by JOREK and MARS-F, showing that while there are differences in the details, the features leading to changes in fast ion deposition appeared similarly in both cases (Särkimäki et al. 2018).…”

Section: High-fidelity Representation Of 3-d Magnetic Fieldmentioning

confidence: 98%

“…Furthermore, it is a linear code, which makes the computations fast but raises the concern on the validity of results when the perturbations are large. We have done a preliminary comparison between the response given by JOREK and MARS-F, showing that while there are differences in the details, the features leading to changes in fast ion deposition appeared similarly in both cases (Särkimäki et al 2018). Figure 5 illustrates the role of the plasma response for the ITER 15MA baseline scenario when the ELM control coils are operated at somewhat exaggerated current value.…”

Section: High-fidelity Representation Of 3-d Magnetic Fieldmentioning

confidence: 99%

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Clearing the road for high-fidelity fast ion simulations in full three dimensions

et al. 2018

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High-energy ions, such as fusion alphas and ions from external heating, can be very sensitive to any non-axisymmetric features in the confining magnetic field due to their collisionless nature. Since understanding the confinement properties of these ions is crucial for ITER (the first fusion reactor currently under construction in Cadarache, France) and beyond, it is of ultimate importance that the predictive simulations are accurate and free of numerical distortions. Adding the third dimension comes at substantial computational cost, calling for new kinds of approaches and computational platforms. In this contribution we discuss what new features, even new physics, the non-axisymmetry brings with it and how one could cope with the ever-increasing demands on both memory and CPU resources. In the end, a few simulation examples with a varying level of non-axisymmetry are given.

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Section: High-fidelity Representation Of 3-d Magnetic Fieldmentioning

confidence: 98%

Section: High-fidelity Representation Of 3-d Magnetic Fieldmentioning

confidence: 99%

Clearing the road for high-fidelity fast ion simulations in full three dimensions

et al. 2018

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“…(5), and regions where ripple exceeds critical ripple value for stochastic-ripple transport, Eq. (7), are on display in Fig. A1 (c).…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…These techniques are based on the loss-map analysis which we originally introduced in Ref. [7]. The loss-map analysis consists of parametrizing particle orbits according to a specific set of constants of motion.…”

Section: Introductionmentioning

confidence: 99%

Efficient and rigorous evaluation of fast particle losses in non-axisymmetric tokamak plasmas

Särkimäki

2020

Nucl. Fusion

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We present various techniques that make orbit-following Monte Carlo simulations faster and more reliable when assessing collisionless fast particle losses due to magnetic field perturbations. These techniques are based on identifying various loss channels in constants of motion space using the so-called loss maps. We demonstrate that this allows one to attribute losses quantitatively to different transport mechanisms, increase signal-to-noise ratio when estimating FILD signal and peak power loads, and connect magnetic field structure directly to fast particle losses. Furthermore, we show that collisionless fast particle transport can be treated as an advection-diffusion process where the transport coefficients can be evaluated with the orbit-following method. Applying these techniques has the potential to make orbit-following simulations faster to perform, or to avoid them completely, while making the results more reliable as they become more clearly connected to underlying physics. We demonstrate these techniques for ITER by showing how alpha particle losses are affected by various magnetic field perturbations, estimating ICRH losses in reduced field scenarios, and performing a scan on alpha particle losses as a function of ELM control coil current phases.

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“…Based on the result of data analyst conducted by researchers on water aerobics and aerobics dance, that both activities have a significant impact on body mass index and fat percentage. Other result state that aerobics dance activity has been shown to significantly increase calorie expenditure which can help to reduce body weight, body fat, and cholesterol levels [17]. According to research Myers Aerobics exercise reduces fat mass in women, in losing weight and reducing body fat it is recommended to exercise regularly [5].…”

Section: Groupmentioning

confidence: 99%

The Impact of Water Aerobics and Aerobics Dance on Body Mass Index and Fat Percentage

Nastiti¹,

Fitri²,

Sultoni³

2020

Proceedings of the 4th International Conference on Sport Science, Health, and Physical Education (ICSSHPE 2019)

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Every individual fitness level will decline as age and weight will increase as the food energy gets from the food consumed every day will accumulate as a reserved fat. To improve the healthy lifestyle of one of them through physical activity, especially through sports activities. The type of exercise that can lose weight is water aerobics. Aerobic is an alternative for all adults who do not like sports on land and can be done by all ages. This research aims to observe the impact of water aerobics and aerobics dance on body mass index and fat percentage. This treatment was carried out 3 times a week for 6 weeks with the same intensity of 65% until 85% from the maximal pulse rate. The population used in this study were active university students, with a sample of 20 students divided into 2 groups of measles 1 (water aerobics) and group 2 (aerobic dance). The design in this study was Randomized Pre-test Post-test Control Group Design with sampling techniques accidental sampling. The research instrument used was a test of height, weight, and skinfold calliper. After analysed water aerobics and aerobics dance impact on body mass index and fat percentage. Another result found that water aerobics and aerobics dance training for 6 weeks can increase calorie expenditure which can reduce weight.

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Mechanics of ELM control coil induced fast particle transport in ITER

Cited by 20 publications

References 20 publications

Clearing the road for high-fidelity fast ion simulations in full three dimensions

Clearing the road for high-fidelity fast ion simulations in full three dimensions

Efficient and rigorous evaluation of fast particle losses in non-axisymmetric tokamak plasmas

The Impact of Water Aerobics and Aerobics Dance on Body Mass Index and Fat Percentage

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