scholarly journals Development of Long-Pulse Heating and Current Drive Actuators and Operational Techniques Compatible with a High-Z Divertor and First Wall

2017 ◽  
Author(s):  
Guiding Wang ◽  
◽  
Keyword(s):  
Pulse Heating ◽  
Current Drive ◽  
First Wall ◽  
Long Pulse

scholarly journals Lower hybrid current drive experiments in support of high confinement long pulse operation in EAST

2017 ◽  
Vol 157 ◽  
pp. 03011 ◽  
Author(s):  
Annika Ekedahl ◽  
Bojiang Ding ◽  
Xianzu Gong ◽  
Marc Goniche ◽  
Miaohui Li ◽  
...  
Keyword(s):  
Current Drive ◽  
Lower Hybrid ◽  
Pulse Operation ◽  
Lower Hybrid Current Drive ◽  
Long Pulse

scholarly journals Towards Advanced Fusion Gyrotrons: 2018 Update on Activities within EUROfusion

2019 ◽  
Vol 203 ◽  
pp. 04007
Author(s):  
John Jelonnek ◽  
Gaetano Aiello ◽  
Stefano Alberti ◽  
Konstantinos Avramidis ◽  
Alex Bruschi ◽  
...  
Keyword(s):  
Cvd Diamond ◽  
Current Drive ◽  
Coaxial Cavity ◽  
Diamond Disk ◽  
Advanced Technologies ◽  
Steady State Operation ◽  
Near Term ◽  
Long Pulse ◽  
System Operating

During the ongoing pre-concept phase (2014 – 2020) for a possible future European DEMOnstration Fusion Power Plant (DEMO) the activities within EUROfusion WP HCD EC Gyrotron R&D and Advanced Developments are focusing on options for near-term solutions, and, at the same time, on long-term even more advanced options. The near-term target for DEMO is to realize pulsed operation. According to the current baseline it will probably use an EC system operating at 170 GHz and 204 GHz is being assessed, whereas the long-term target aims for steady-state operation and frequencies for current drive up to 240 GHz. Common targets for both are an RF output power per unit of significantly above 1 MW (target: 2 MW) and a total gyrotron efficiency of significantly higher than 60 %. Frequency step-tunability and multi-purpose/multi-frequency operation have to be considered. Those targets shall be achieved by considering the coaxial-cavity gyrotron technology and advanced technologies for key components (e.g. CVD diamond-disk Brewster angle window). Advanced simulation and test tools are complementing the research and developments. Gyrotron development is additionally supported by a significant investment into a new multi-megawatt long-pulse gyrotron test stand which is under final installation at KIT currently.

Development of high-power, long-pulse, multi-frequency ECH/CD system for JT-60SA

2021 ◽  
Author(s):  
Takayuki Kobayashi ◽  
Hibiki Yamazaki ◽  
Shinichi Hiranai ◽  
Masayuki Sawahata ◽  
Masayuki Terakado ◽  
...  
Keyword(s):  
Transmission Line ◽  
High Power ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Stable Operation ◽  
Electron Cyclotron Heating ◽  
Dummy Load ◽  
Mode Purity ◽  
Long Pulse

Abstract A gyrotron and a matching optics unit (MOU) for the multi-frequency electron cyclotron heating and current drive (ECH/CD) system in JT-60SA have been developed successfully. The gyrotron demonstrated stable operation at high powers of 1.5 MW for 5 s and 1.9 MW for 1 s at 110 GHz. To obtain high HE11 mode purity (> 90%) at the outlet of the waveguide in the ECH/CD launcher, a MOU for operating at three frequencies of 82 GHz, 110 GHz, and 138 GHz that includes three pairs of water-cooled phase correcting mirrors has been developed, which allows the mirrors to be changed without opening the evacuated MOU. The mode purity at the inlet of a dummy load in the transmission line was evaluated at high-power and an HE11 mode purity of > 90% was obtained at three frequencies.

Crack growth in first wall made of reduced activation ferritic steel by transient creep due to long pulse operation

2003 ◽  
Vol 66-68 ◽  
pp. 317-321 ◽  
Author(s):  
T. Honda ◽  
Y. Kudo ◽  
T. Hatano ◽  
K. Kikuchi ◽  
T. Nishimura ◽  
...  
Keyword(s):  
Crack Growth ◽  
Ferritic Steel ◽  
Transient Creep ◽  
First Wall ◽  
Pulse Operation ◽  
Long Pulse
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