Initial phase wall conditioning in KSTAR

Hong, Suk–Ho; Kim, Kwang Pyo; Kim, Sung Woo; Sun, Jong-Ho; Lee, Dong Su; Woo, Hyun-Jong; Lee, Sang-Yong; Lee, Sang-Hwa; Park, Eunkyung; Park, Sang-Joon; Kim, Kyung-Min; Lee, KunSu; Kim, Sun-Ho; Kim, Jong-Su; Wang, Sun-Jung; Park, Jaemin; Kim, Woong-Chae; Kim, Hak-Kun; Park, Kaprai; Yang, H.L.; Oh, Y.K.; Kwak, J.G.; Na, Hoon-Kyun; Kim, Jae-Yong; Chung, Kyu‐Sun

doi:10.1088/0029-5515/51/10/103027

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…For a machine equipped with superconducting coils, ICRH or ECRH wall conditioning (ICWC or ECWC) would be a mandatory choice. Wall conditioning with ICWC between shots is performed regularly to have a better wall condition and density control [4]. Table 1 tabulates the technical specifications and the current achievements of KSTAR, actively preparing for its long-pulse mission step by step to become one of the promising candidates for ITER pilot devices.…”

Section: Device Updatesmentioning

confidence: 99%

Overview of KSTAR initial operation

Kwon¹,

Oh²,

Yang³

et al. 2011

Nucl. Fusion

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Since the successful first plasma generation in the middle of 2008, three experimental campaigns were successfully made for the KSTAR device, accompanied with a necessary upgrade in the power supply, heating, wall-conditioning and diagnostic systems. KSTAR was operated with the toroidal magnetic field up to 3.6 T and the circular and shaped plasmas with current up to 700 kA and pulse length of 7 s, have been achieved with limited capacity of PF magnet power supplies. The mission of the KSTAR experimental program is to achieve steady-state operations with high performance plasmas relevant to ITER and future reactors. The first phase (2008–2012) of operation of KSTAR is dedicated to the development of operational capabilities for a super-conducting device with relatively short pulse. Development of start-up scenario for a super-conducting tokamak and the understanding of magnetic field errors on start-up are one of the important issues to be resolved. Some specific operation techniques for a super-conducting device are also developed and tested. The second harmonic pre-ionization with 84 and 110 GHz gyrotrons is an example. Various parameters have been scanned to optimize the pre-ionization. Another example is the ICRF wall conditioning (ICWC), which was routinely applied during the shot to shot interval. The plasma operation window has been extended in terms of plasma beta and stability boundary. The achievement of high confinement mode was made in the last campaign with the first neutral beam injector and good wall conditioning. Plasma control has been applied in shape and position control and now a preliminary kinetic control scheme is being applied including plasma current and density. Advanced control schemes will be developed and tested in future operations including active profiles, heating and current drives and control coil-driven magnetic perturbation.

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Section: Device Updatesmentioning

confidence: 99%

Overview of KSTAR initial operation

Kwon¹,

Oh²,

Yang³

et al. 2011

Nucl. Fusion

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“…Remarkably the occurrence of a well-defined lipomatous mass juxtaposed to another nonlipomatous mass (type III), as seen in our case, is described in only 1 of the 15 patients; moreover, the only case of DDLS with osteosarcoma of this study showed a morphology of type I, but not type III. 13 In our DDLS on CT images the most relevant elements in the context of the osteosarcomatous component were diffuse and coarse calcifications.…”

Section: Discussionmentioning

confidence: 69%

Dedifferentiated Liposarcoma of Retroperitoneum With Extensive Osteosarcomatous Component

Trombatore

Caltabiano

Giovanni

et al. 2016

International Surgery

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Dedifferentiated liposarcoma (DDLS) is a rare subtype of liposarcoma composed of 2 components: a well-differentiated liposarcoma (WDLS) and a nonlipogenic sarcoma (dedifferentiation component), represented in .90% of cases by a high grade undifferentiated pleomorphic sarcoma, in the form of both small microscopic foci and/ or grossly recognizable nodular masses. The paper reports a rare case of a retroperitoneal DDLS, in which approximately half of a tumor mass is composed of a high-grade osteosarcoma. A 68-year-old Caucasian woman affected by abdominal discomfort. Clinical examination showed a large, hard and fixed abdominal mass. Computed tomography scan revealed a huge retroperitoneal mass composed of 2 distinct components: the upper part showed a hypodense tissue, while the lower part showed a higher density and coarse calcifications. Patient underwent to a challenging surgical resection of the mass that, at histological examination, resulted to be a DDLS, in which a WDLS coexisted with an osteosarcoma. Presurgical diagnosis of DDLS is difficult due to the great morphologic variability of the dedifferentiated component, ranging from low to high-grade nonlipogenic sarcoma. The present case contributes to widen the morphological spectrum of DDLS, emphasizing the possibility that a retroperitoneal mass with a

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“…Plasma-surface interaction is one of the critical issues for ITER. Carbon-based low Z materials have been the most commonly used plasma-facing components (PFCs) in conventional tokamaks for a long time [146][147][148]. Recently, JET [149] and ASDEX Upgrade [150] have employed beryllium and full tungsten first walls for ITER-relevant wall conditions [149,150].…”

Section: Plasma-surface Interactionmentioning

confidence: 99%