Core-edge 2D fluid modeling of full tokamak discharge with varying magnetic equilibrium: from WEST start-up to ramp-down

In the present work we investigate for the first time the 2D fluid transport of the plasma in WEST during an entire discharge from the start-up to the ramp-down (shot #54487). The evolution of density profile, electron and ion temperatures together with the experimental magnetic equilibrium, total current and gas-puff rate is investigated. Comparisons with the interferometry diagnostic show a remarkable overall qualitative agreement during the discharge that can be quantitative at some locations in the plasma core. If at the onset of the X-points during the ramp-up the electron heat flux is dominant at the target, present results show that the ion heat flux becomes dominant during the stationary phase of the discharge. Using a simple model for erosion, present results assess the tungsten sputtering due to deuterium ions during the start-up and ramp-up phases of the discharge and confirms the need to consider full discharge simulation to accurately treat the W source of contamination. This work also demonstrates the interest of developing magnetic equilibrium free solver including efficient time integration to step toward predictive capabilities in the future for fusion operation.

Energy confinement in the spherical tokamak Globus-M2 with a toroidal magnetic field reaching 0.8 T

The work presents the results of the energy confinement study carried out on the compact spherical tokamak (ST) Globus-M2 with toroidal magnetic field (BT) as high as 0.8 T. A reproducible and stable discharge was obtained with the average plasma density (5-10) 1019 m-3. Despite the increase in the magnetic field, the neutral beam injection (NBI) led to clear and reproducible transition to the H-mode accompanied by a decrease in the turbulence level at the plasma edge. NBI allowed effectively heat the plasma: electron and ion temperatures in the plasma core exceeded 1 keV. In comparison with the previous experiments carried out with BT=0.4 T plasma total stored energy was increased by a factor of 4. The main reason of this phenomenon is a strong dependence of the energy confinement time (τE) on the toroidal magnetic field in the spherical tokamak. It was experimentally confirmed that such kind of dependence is valid for ST with magnetic field up to 0.8 T. It also has been shown that the enhancement of the energy confinement in the Globus-M2 with collisionality decrease is associated with an improvement of both electron and ion heat transport.

Nonlinear MHD simulation of core plasma collapse events in Wendelstein 7-X

Three-dimensional nonlinear MHD simulations study the core collapse events observed in a stellarator experiment, Wendelstein 7-X. In the low magnetic shear configuration like the Wendelstein 7-X, the rotational transform profile is very sensitive to the toroidal current density. The 3D equilibrium with localized toroidal current density is studied. If the toroidal current density follows locally in the middle of the minor radius, the rotational transform is also changed locally. Sometimes, the magnetic topology changes due to appearing the magnetic island. A full three-dimensional nonlinear MHD code studies the nonlinear behaviors of the MHD instability. It was found that the following sequence. At first, the high-n ballooning-type mode structure appears in the plasma core, and then the mode linearly grows. The high-n ballooning modes nonlinearly couple and saturate. The mode structure changes to the low-n mode. The magnetic field structure becomes strongly stochastic into the plasma core due to the nonlinear coupling in that phase. Finally, the plasma pressure diffuses along the stochastic field lines, and then the core plasma pressure drops. This is a crucial result to interpret the core collapse event by strong nonlinear coupling.

ANALISIS PENDAPATAN PETERNAK AYAM BROILER PADA POLA KEMITRAAN YANG BERBEDA DI KECAMATAN PAYAKUMBUH TIMUR (Studi Kasus PT. Karya Semangat Mandiri (KSM) dan Poultry Shop Torang) (Analysis of Broiler Chicken Income in Different Partnership Patterns in East Payakumbuh District (Case Study of PT. Karya Semangat Mandiri (KSM) and Poultry Shop Torang))

This study aimed to determine the partnership pattern and the income of broiler breeders partnering with PT. Karya Semangat Mandiri (KSM) and Torang Poultry Shop in East Payakumbuh District. The census method was used in this study through a survey method and direct observation in the field using a questionnaire involving 12 broiler breeders who partnered with PT. KSM and ten broiler breeders partnered with Torang Poultry Shop. Descriptive qualitative and quantitative analyses were used to analyze the data by observing the patterns and calculating the costs, income, and revenues. The results of the study indicated that the breeders partnered with PT. KSM adopted a plasma core partnership pattern with a written agreement, and the farmers were required to place a security deposit to the company. The farmer who partnered with Torang Poultry Shop used a profit-sharing pattern in which the benefits were equally shared. The agreement was not in written form, and the farmers did not provide a security deposit. The income of farmers partnered with PT. KSM was higher compared to income of the farmers partnered with the Torang Poultry Shop

EVALUATION OF PARTNERSHIP RELATIONSHIP IN ORGANIC VEGETABLE SUPPLY CHAIN IN CV. KURNIA KITRI AYU FARM MALANG

Market demand for organic vegetables at CV. Kurnia Kitri Ayu Farm continues to grow according to consumer needs. Market development is determined by the quality and continuity of the marketing distribution. To maintain this, in its business activities CV. Kurnia Kitri Ayu Farm established partnerships with several parties. The objectives of the research were 1) Knowing the supply chain of organic vegetables both in partnership and non-partnership with CV. KKAF, 2) Knowing the partnership patterns formed in the CV. KKAF, 3) Evaluating trust, commitment, communication, satisfaction, and dependence in organic vegetable supply chain partnerships. Respondents in this study consisted of the head of partner farmer groups, owners of CV. Kurnia Kitri Ayu Farm and the head of staff as a permanent partner for the home industry (baby care). The results showed 1) The flow of the organic vegetable supply chain consisted of the flow of goods, the flow of money, and the flow of information, 2) the partnership patterns contained in the organic vegetable supply chain, namely the plasma core partnership pattern, subcontracts, and general trading, 3) All parties in the supply chain on average feel very confident, have a very good commitment, communicate frequently, feel satisfied, and are very dependent on the performance of its partner members.

Design and Build Information System of the Joper Chicken Plasma Core at PT. Barokah

Breeding joper chickens with a partnership system is a form of business that is currently on the rise, breeding in partnership is a form of cooperation between breeders (plasma) and companies (nucleus). The yields will be divided according to the percentage agreed upon in the contract agreement that has been made between plasma and nucleus. It takes approximately 12 weeks for the farmer to raise the chickens until harvest. During this period, breeders must take care of the chickens maximally so that it is hoped that the harvest will be profitable for both the farmer as the plasma and the company as the nucleus. There needs to be extra careful management in the process of cultivating joper chickens because chicken farming can be said to have a high enough risk. Therefore, this system was built in order to overcome problems such as irregular feeding or vaccines, manual recording of daily chicken development, disease management and lack of insight into diseases that chickens often get, as well as weighing calculations that are still being carried out. Manually. So that by overcoming these problems the crop yields will increase and the level of productivity of chickens is controlled. The tools used in making this system are Visual Basic. Application design method using ProtoTyping method.

Global calculation of neoclassical impurity transport including the variation of electrostatic potential

Recently, the validity range of the approximations commonly used in neoclassical calculation has been reconsidered. One of the primary motivations behind this trend is observation of an impurity hole in LHD (Large Helical Device), i.e. the formation of an extremely hollow density profile of an impurity ion species, such as carbon $\text{C}^{6+}$ , in the plasma core region where a negative radial electric field ( $E_{r}$ ) is expected to exist. Recent studies have shown that the variation of electrostatic potential on the flux surface, $\unicode[STIX]{x1D6F7}_{1}$ , has significant impact on neoclassical impurity transport. Nevertheless, the effect of $\unicode[STIX]{x1D6F7}_{1}$ has been studied with radially local codes and the necessity of global calculation has been suggested. Thus, we have extended a global neoclassical code, FORTEC-3D, to simulate impurity transport in an impurity hole plasma including $\unicode[STIX]{x1D6F7}_{1}$ globally. Independently of the $\unicode[STIX]{x1D6F7}_{1}$ effect, an electron root of the ambipolar condition for the impurity hole plasma has been found by global simulation. Hence, we have considered two different cases, each with a positive (global) and a negative (local) solution of the ambipolar condition, respectively. Our result provides another support that $\unicode[STIX]{x1D6F7}_{1}$ has non-negligible impact on impurity transport. However, for the ion-root case, the radial $\text{C}^{6+}$ flux is driven further inwardly by $\unicode[STIX]{x1D6F7}_{1}$ . For the electron-root case, on the other hand, the radial particle $\text{C}^{6+}$ flux is outwardly enhanced by $\unicode[STIX]{x1D6F7}_{1}$ . These results indicate that how $\unicode[STIX]{x1D6F7}_{1}$ affects the radial particle transport crucially depends on the profile of the ambipolar- $E_{r}$ , which is found to be susceptible to $\unicode[STIX]{x1D6F7}_{1}$ itself and the global effects.

Analisis Manajemen Keuangan pada Usaha Peternakan Kemitraan Ayam Broiler Skala Rakyat

Poultry sectors contributed 2,51% of GDRP in the Central Java Province, where Semarangcontributed 1.135.487 kg of Broilers chicken in 2016. Plasma-core partnership is one of the most used business cooperation types amongst the poultry farmers. Classification in poultry business scale divides into 3 classes, which were: Small Scale (≤5.000 heads), Medium Scale (5.001-10.000 heads) and Large Scale (>10.000 head). The purpose of this study is to estimate the operating cashflows and revenue. The benefit of this study is to detect the profits and anticipate losses in poultry farming. This study used Survey methods, location arrangement used purposive sampling and data collected by interviews with the owners. Data analysis used revenue and operating cash flow computation. The results of this study show the net revenue of this poultry farm is IDR.171.488.834, while the operating cash flows are IDR.170.286.117,65. The cost of chicken seedlings purchase and its feed is the most expensive amongst all subjects. Clustering results shows that this poultry was categorized as Small scale poultry, where it’s population is only 4.000 chickens, but are profitable and worthy to expand, and makes it one of the most longest-living poultry farms in the region