CN-120878301-B - Self-calibration loss fast ion detector system for deuterium-tritium fusion experiment

CN120878301BCN 120878301 BCN120878301 BCN 120878301BCN-120878301-B

Abstract

The invention discloses a deuterium and tritium fusion experiment-oriented self-calibration loss fast ion detector system, which relates to the technical field of magnetic confinement fusion plasma diagnosis and comprises a vacuum flange, a vacuum pipeline, a probe shaft pipeline, a detector, a scintillator plate, a calibration lamp and a calibration step, wherein the vacuum flange is arranged on a magnetic confinement fusion device, the vacuum pipeline is arranged at a corresponding window on the vacuum flange, a vacuum window is arranged at one end of the vacuum pipeline, which is far away from the window, the probe shaft pipeline is arranged in the vacuum pipeline, the detector is arranged at one end of the probe shaft pipeline, which extends into a vacuum chamber of the magnetic confinement fusion device, and is used for generating an optical signal.

Inventors

HAN YUXIAO
XIE JINLIN
CHEN WEI
XU HONGBING
ZHANG CONGXIANG
ZHANG JIE
Zhang Diepo

Assignees

中国科学技术大学

Dates

Publication Date: 20260512
Application Date: 20250723

Claims (9)

1. The utility model provides a deuterium tritium fusion experiment oriented self-calibration loss fast ion detector system, includes the vacuum flange that is used for installing on magnetism restraint fusion device, its characterized in that still includes: the vacuum pipeline is arranged at the corresponding window on the vacuum flange, and one end of the vacuum pipeline, which is far away from the window, is provided with a vacuum window; A probe shaft tube mounted within the vacuum tube; The detector is arranged at one end of the probe shaft pipeline extending into the vacuum chamber of the magnetic confinement fusion device and is used for generating optical signals, a scintillator plate, a calibration lamp and a calibration step are arranged in the detector, the light energy of starting the calibration lamp is projected onto the scintillator plate, the calibration step is arranged at the edge of the scintillator plate, the height of the calibration step is higher than the plane of the scintillator plate, and the calibration step is used for distinguishing a scintillator plate area and a calibration step area in a calibration image and is used as a focusing reference of an image transmission system; an image transfer system for photographing and imaging the optical signal generated inside the detector; The ultrahigh vacuum feed-through electrical connector is used for realizing electrical signal exchange between a vacuum environment and an external environment; The upper computer is electrically connected with the image transmission system and the calibration lamp to control the image transmission system and the calibration lamp to work in a coordinated manner.
2. The self-calibrating loss fast ion detector system for deuterium-tritium fusion experiments of claim 1, wherein the light of the calibrating lamp is projected onto the scintillator plate to generate a calibrating light signal, and fast ions lost in the magnetic confinement fusion device strike the scintillator plate to generate an experimental light signal.
3. The self-calibration loss fast ion detector system for deuterium-tritium fusion experiments of claim 1, wherein the calibration lamp is a patch LED with a light emission wavelength consistent with that of the scintillator plate to avoid additional aberration generated by the image transfer system during calibration.
4. The self-calibrating loss fast ion detector system for deuterium-tritium fusion experiments of claim 1, wherein the image transfer system comprises an imaging lens and a high-speed camera, the high-speed camera is arranged at a vacuum window, and the imaging lens is arranged at a lens mount of the high-speed camera.
5. The self-calibrating loss fast ion detector system for deuterium-tritium fusion experiments according to claim 1, wherein the ultra-high vacuum feed-through electrical connector is arranged on the peripheral side surface of the vacuum pipeline and is used for realizing electrical signal exchange under the premise of ensuring extremely low vacuum leakage rate.
6. The self-calibration loss fast ion detector system for deuterium-tritium fusion experiments according to claim 1, wherein the calibration lamp is connected with the upper computer through a calibration lamp signal wire, and the calibration lamp signal wire is led out through a wiring hole of the detector and is wired outside a probe shaft tube way so as to avoid shielding an optical path of an image transmission system.
7. The self-calibrating loss fast ion detector system for deuterium-tritium fusion experiments of claim 6, wherein the calibration lamp signal line is soldered with the metal contacts of the ultra-high vacuum feed-through electrical connector.
8. The self-calibration loss fast ion detector system for deuterium-tritium fusion experiments of claim 1, wherein the probe shaft pipeline is hollow in the inside to shield external stray light interference, so that only scintillation bright spots generated by fast ions striking a scintillator plate are displayed in a high-speed camera view during the experiments, and only calibration light signals are displayed in the high-speed camera view during the calibration.
9. The self-calibration loss fast ion detector system for deuterium-tritium fusion experiments of claim 1, wherein the workflow of each component controlled by the upper computer is as follows: Before the experiment starts, the upper computer controls the calibration lamp to be lightened, and the high-speed camera focuses on the calibration step sideline and shoots a calibration image; in the experimental process, a high-speed camera shoots a scintillation pattern on a scintillator plate; After the experiment is finished, the calibration image is used for carrying out calibration processing on the experimental image data.

Description

Self-calibration loss fast ion detector system for deuterium-tritium fusion experiment Technical Field The invention relates to the technical field of magnetic confinement fusion plasma diagnosis, in particular to a self-calibration loss fast ion detector system for deuterium-tritium fusion experiments. Background In the current magnetic confinement fusion experiment, the plasma is mainly assisted by means of neutral beam injection, ion cyclotron heating and the like, and high-energy particles generated by an auxiliary heating system are important to heating efficiency and fusion reaction rate, so that the method has very important significance for researching interaction between the high-energy particles and magnetic fluid instability in the plasma. At present, a fast ion loss detector is mainly used for acquiring information such as energy loss of fast ions, throwing angle and the like. The existing fast ion loss detector generally uses a high-speed camera to shoot the inside of the detector in a shading environment, when fast ion loss exists in an experiment, the scintillator in the detector can be hit by fast ions to form corresponding bright spots, the energy and throwing angle of the fast ions can be obtained by analyzing the coordinate positions of the bright spots on the scintillator, and the track of the fast ion loss can be obtained by further calculation. In the subsequent data processing, it is necessary to determine the position of the scintillator region in the screen of the high-speed camera, thereby determining the coordinates of the bright spots in the scintillator coordinate system. At present, in order to avoid radiation safety accidents, all large magnetic confinement fusion devices are forbidden to approach to an experimental device in the experimental process, and each experiment lasts for a period of months generally. During future deuterium-tritium fusion experiments, the test device cannot be accessed for debugging even for years. Therefore, the fast ion detector with loss installed on the fast ion detector can only be manually lighted outside in the initial installation, and the camera is controlled to shoot a frame of calibration image for later data processing. The current lost fast ion detector has the following problems: 1. The scintillator position cannot be calibrated effectively, and the magnetic confinement fusion device is influenced by strong electromagnetic force in the experimental process to generate vibration. The fast ion loss detector is arranged on the magnetic confinement fusion device, and the light path of the fast ion loss detector can be influenced by vibration, so that the position of the scintillator in the field of view of the high-speed camera is often shifted in the period of several months of one round of experiments. Therefore, only one calibration is not enough by manually polishing outside in the initial stage of the detector installation, and the accuracy of subsequent data processing cannot be ensured. 2. The focusing condition of the image transmission system cannot be effectively determined, because the scintillator of the fast ion loss detector is a pure white rectangular plate, the edge of the scintillator is a detector inner wall perpendicular to the scintillator, and for the image transmission system, the upper edge of the detector inner wall and the scintillator are not in the same imaging distance, so that a reference object is lacking when the image transmission system focuses on the scintillator, imaging definition cannot be determined even if external lighting exists when the image transmission system is debugged, and therefore, the scintillator cannot be accurately focused. Even if the initial focusing is accurate, it is difficult to avoid focus shift caused by vibration of the magneto-restrictive fusion device Disclosure of Invention The invention aims to provide a self-calibration loss fast ion detector system for a deuterium-tritium fusion experiment, which aims to solve the defects in the prior art. The self-calibration loss fast ion detector system for the deuterium-tritium fusion experiment comprises a vacuum flange, a vacuum pipeline, a probe shaft pipeline, a detector, a scintillator plate, a calibration lamp and a calibration step, wherein the vacuum flange is used for being installed on a magnetic confinement fusion device, the vacuum pipeline is installed at a position of a corresponding window on the vacuum flange, a vacuum window is installed at one end, far away from the window, of the vacuum pipeline, the probe shaft pipeline is installed in the vacuum pipeline, the detector is installed at one end, extending into a vacuum chamber of the magnetic confinement fusion device, of the probe shaft pipeline and is used for generating optical signals, the scintillator plate, the calibration lamp and the calibration step are installed in the detector, light energy for starting the calibration lamp is projected onto the scintillator