Development Of Fusion Research Research Articles

Towards advanced divertor configurations on the J-TEXT tokamak

Developing advanced magnetic divertor configurations to address the coupling of heat and particle exhaust with impurity control is one of the major challenges currently constraining the further development of fusion research. It has therefore become the focus of extensive attention in recent years. In J-TEXT, several new divertor configurations, including the high-field-side single-null poloidal divertor and the island divertor, as well as their associated fundamental edge divertor plasma physics, have recently been investigated. The purpose of this paper is to briefly summarize the latest progress and achievements in this relevant research field on J-TEXT from the past few years.

Remote Control for the HT-7 Distributed Data Acquisition System

HT-7 is the first superconducting tokamak device for fusion research in China. Many experiments have been done in the machine since 1994, and lots of satisfactory results have been achieved in the fusion research field on HT-7 tokamak [1]. With the development of fusion research, remote control of experiment becomes more and more important to improve experimental efficiency and expand research results. This paper will describe a RCS (Remote Control System), the combined model of Browser/Server and Client/Server, based on Internet of HT-7 distributed data acquisition system (HT7DAS). By means of RCS, authorized users all over the world can control and configure HT7DAS remotely. The RCS is designed to improve the flexibility, opening, reliability and efficiency of HT7DAS. In the paper, the whole process of design along with implementation of the system and some key items are discussed in detail. The System has been successfully operated during HT-7 experiment in 2002 campaign period.

CAMAC based continuous/transient digitizer for long duration discharge

With the development of fusion research, in the next generation tokamak like SST1 and ITER the tokamak discharge duration time of the order of 1000 sec is planned. At the same time acquisition of rapid changes of plasma parameters during discharge is required and this demands for higher sampling rate to acquire the data. Hence a large size of RAM (memory) is required to fulfill the above requirements but normally CAMAC based digitizer has limited on-board RAM which can be emptied only after the buffer is completely filled. Therefore, acquisition period is dependent on sampling frequency of the signal as well as on existing size of RAM. This drawback of above is overcome in this design of CAMAC based digitizer where we are using combination of FIFO memory and RAM to get continuous lossless acquisition as well as transient acquisition. This paper includes design of 4-channel CAMAC digitizer with 32 K samples RAM per channel for on-board storage and 8 K samples FIFO per channel for continuous acquisition. The module can be operated in different modes like monitoring, transient acquisition and continuous lossless acquisition with selectable sampling rate

Role of studies on plasma-wall interactions in fusion research development.

An introductory review on the role of studies on plasma-wall interactions in fusion research development i s given. The control effect of the boundary plasma on plasma-wall interactions at the first walls of toroidal devices is discussed in connection with the material selection for the first wall.

John Bertram Adams, 24 May 1920 - 3 March 1984

The death of John Adams shortly before his 64th birthday shocked and saddened the world community of scientists. Adams spent much of his career working at the European Organization for Nuclear Research (CERN) in Geneva. His reputation rests first and foremost on the great particle accelerators that he built at CERN. He also played a key role in the development of fusion research in the United Kingdom. He was a man of many talents whose great achievements were held in the highest esteem in all parts of the world.