Method and device for online cleaning and detection of first lens of fusion device

Abstract

The invention belongs to a nuclear fusion plasma diagnostic system, and particularly relates to a device and method for online cleaning of optical elements in a vacuum chamber on the basis of laser and optical technologies. The device comprises a pulse laser, a two-dimensional galvanometer system, a CCD camera, an auxiliary light source and a light path transmission system. The two-dimensional galvanometer system, a light beam conversion system, a two-color beam splitter, a fusion device diagnosis window, a first lens and a fusion device vacuum chamber are arranged along a straight line. The fusion device vacuum chamber is provided with the fusion device diagnosis window. The pulse laser is arranged on one side of the two-dimensional galvanometer system. The auxiliary light source is arranged on one side of the two-color beam splitter. The CCD camera is arranged on the outer side of the auxiliary light source. The method and system have the advantages that proper laser parameters are selected, interaction of laser and pollutants on the surface of the first mirror is utilized, thermal expansion is generated, explosion, gasification and evaporation are generated within a short period of time, and the pollutants are separated from the surface of the mirror to achieve the cleaning effect.

Description

technical field [0001] The invention belongs to a nuclear fusion plasma diagnostic system, in particular to an online cleaning method and device for optical elements in a vacuum chamber based on laser and optical technology. Background technique [0002] In controlled nuclear fusion experimental research, scientists need to use various optical diagnostic systems to obtain basic physical parameters in the plasma discharge process, such as electron density, electron temperature, impurity content in the discharge, and changes in the discharge potential type. Due to the complexity of fusion devices, these optical diagnostic systems must use optical components placed in the vacuum chamber of the device, such as metal mirrors, concave mirrors, quartz windows, etc. to transmit the detection beam out to the detector for measurement. These optical components placed in the vacuum chamber to transmit optical signals are called first mirrors. [0003] Since the first mirror of the fusi...

AI Technical Summary

Problems solved by technology

[0003] Since the first mirror of the fusion device works in a high-temperature and high-density plasma discharge environment, the impurity particles in the discharge will deposit on the surface of the optical element. As time goes by, the deposition thickness will increase, and the reflectivity of the optical element will decrease, even Inability to transmit optical signals, while fusion device vacuum chambers cannot be opened during discharge, nor can contaminated optics be replaced

Therefore, an online cleaning system for the first mirror must be established

Images