Improvement of the phase regulation between two amplifiers feeding the inputs of the 3dB combiner in the ASDEX-Upgrade ICRH system

被引：2

作者：

Grine, D. ^{[1
]}

Pompon, F. ^{[2
]}

Faugel, H. ^{[2
]}

Funfgelder, H. ^{[2
]}

Noterdaeme, J. M. ^{[2
]}

Koch, R. ^{[1
]}

机构：

[1] Royal Mil Acad, Plasma Phys Lab, 30 Avn Renaissance, Brussels, Belgium

[2] Max Planck Inst, Plasma Phys, Garching, Germany

来源：

RADIO FREQUENCY POWER IN PLASMAS: PROCEEDINGS OF THE 19TH TOPICAL CONFERENCE | 2011年 / 1406卷

关键词：

3dB combiner; phase; DDS; Asdex-Upgrade; ICRF;

D O I：

10.1063/1.3664939

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The present ICRF system at ASDEX Upgrade uses 3dB combiners to forward the combined power of a generator pair to a single line [1]. Optimal output performance is achieved when the voltages at the two input lines of a combiner are equal in amplitude and in phase quadrature. If this requirement is not met, a large amount of power is lost in the dummy loads of the combiner. To minimize losses, it is paramount to reach this phase relationship in a fast and stable way. The current phase regulation system is based on analog phase locked loops circuits. The main limitation of this system is the response time: several tens of milliseconds are needed to achieve a stable state. In order to get rid of the response time limitation of the current system, a new system is proposed based on a multi-channel direct digital synthesis device which is steered by a microcontroller and a software-based controller. The proposed system has been developed and successfully tested on a test-bench. The results show a remarkable improvement in the reduction of the response times. Other significant advantages provided by the new system include greater flexibility for frequency and phase settings, lower cost and a noticeable size reduction of the system.

引用

页数：4