9 results about "Electron spectrometer" patented technology

The invention relates to the technical field of electron energy measurement, and discloses an electron spectrometer and an electron energy spectrum measurement method and system.The electron spectrometer comprises a magnetic deflection unit used for receiving an incident to-be-measured electron beam, generating a magnetic field and applying the magnetic field to all to-be-measured electrons in the to-be-measured electron beam; the scintillator fluorescent screen is arranged at the downstream of the magnetic deflection unit and used for receiving the deflected electrons to be detected, and the electrons bombard the scintillator fluorescent screen and generate light spots; the optical acquisition unit is used for acquiring a light spot image on the scintillator fluorescent screen; and the signal processing unit is used for processing the light spot image so as to identify the spatial position information of the light spot in the light spot image and convert the spatial position information into electronic energy data. The method has the beneficial effects that the unification of high resolution and high measurement efficiency is realized, and the problem of signal accumulation under a high counting rate of a traditional direct measurement method and the inherent defect of low efficiency of a scanning type magnetic spectrometer are overcome.

A kind of synchronous timing control system for strong laser plasma interaction experiment, including a femtosecond laser device, a square wave signal generator, a jet signal synchronizer, three delay timers, a 12-way signal synchronizer, two shutter controllers, a YAG laser, a jet controller, multiple experimental acquisition instruments including an electron spectrometer, a rear imaging CCD, a spectrometer CCD.The present application is mainly applied to the field of strong laser plasma interaction, which can accurately control the interaction time of femtosecond laser pulse and nanosecond gate plasma channel, and accurately control the start acquisition time and acquisition duration of various experimental data, improve the signal-to-noise ratio, and the whole timing system is very easy to adjust.The present application also has strong expansibility, when ionized gas is not needed to form plasma channel, the 1Hz pulse signal timing of the right half of the dashed line can be removed, so that the interaction time of femtosecond laser pulse and millisecond gate jet gas can be accurately controlled.The expansibility of the present application is also reflected in that enough output ports have been reserved, and suitable functional elements can be connected subsequently.

1. Name of the designed product: multi-channel electronic spectrometer. 2. Use of the designed product: for nuclear magnetic resonance data acquisition, simultaneously acquiring multiple data to K-space, parallel receiving and processing multi-frequency signals from different atomic nuclei. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: front view.

This invention discloses an attosecond-level delay diagnosis method between electron beams and pulsed lasers, belonging to the technical field of delay diagnosis between electron beams and pulsed lasers. The method includes: adjusting the delay between a chirped pulsed laser a and a chirped electron beam b via a delay device; recording the positions of the delay devices corresponding to the appearance and end of the transverse modulation of the electron beam on an electron spectrometer to obtain the transverse modulation and energy spectrum of the chirped electron beam b; obtaining the chirped distribution of the chirped electron beam b using an electron beam chirped diagnostic reconstruction method based on laser transverse modulation of the electron beam; obtaining the angular distribution of the chirped electron beam b in the spatial domain based on [variable name missing]; determining the positive or negative value of the delay; performing a spatial domain Fourier transform on the angular distribution of the chirped electron beam b in the spatial domain; and further calculating the delay difference between the chirped electron beam b and the chirped pulsed laser a. This invention can diagnose attosecond-level delays between electron beams and pump pulses; the device is simple; and it has good scalability, extending to any wavelength band.

The application relates to the field of laser technology and discloses a high-harmonic wave and above-threshold ionization synergic regulation method and system, which adopts a fundamental frequency light and multiple auxiliary fields to form a time-space overlapping composite laser field, adjusts the wavelength, intensity, delay time and polarization direction of the auxiliary field, forms a multi-parameter laser field, takes the multi-parameter laser field as a physical action carrier, synchronously collects HHG spectral intensity distribution and ATI electron spectrum data by using a high-sensitivity spectrometer and an electron spectrometer on the basis of the multi-parameter laser field, inputs the data into a Bayesian optimization algorithm, dynamically adjusts laser parameters, obtains an optimal laser parameter combination, adjusts an electron re-collision probability by adjusting laser ellipticity based on the obtained optimal laser parameter combination, controls an electron ionization time and return energy by using a two-color field carrier envelope phase, synchronously optimizes an HHG cutoff frequency and an ATI spectrum peak position, and realizes closed-loop control; and the application realizes synergic regulation of high-harmonic wave generation and above-threshold ionization processes.

The present application provides a kind of electrostatic deflection convergent energy analyzer, it has wide receiving angle and high two-dimensional convergent performance, can carry out imaging to two-dimensional real space image or emission angle distribution, and can carry out two-dimensional convergent and imaging under 90 ° deflection relative to the direction of incidence. One or more outer electrodes and multiple inner electrodes are arranged along the shape of two rotors formed on the inner side and outer side of common rotation axis. Among them, the inner surface shape of outer electrode is tapered, the diameter of which decreases towards both ends, and the outer surface shape of inner electrode is tapered, the diameter of which decreases towards both ends. Electron entrance hole and exit hole are formed on the outer electrode at both ends of the rotation axis respectively. Voltage for electron acceleration and deceleration is applied to outer electrode and inner electrode in proportion to the energy of incident electron. Voltage is applied to one or more electrodes except the inner electrode at both ends, which is twice or more than the converted acceleration voltage obtained by converting the energy of electron into acceleration voltage based on the potential of outer electrode where entrance hole is formed.

The utility model provides a system for simulating a space orbit electron radiation environment. The system comprises a femtosecond laser generating device, a vacuum chamber, an optical system, a composite target, a magnet for generating a focusing magnetic field, a beam detector and an electron spectrometer, the composite target, the focusing magnetic field, the beam detector and the electron spectrometer are all arranged in the vacuum chamber; the composite target is T-shaped and comprises a target I and a target II which are perpendicular to each other; the femtosecond laser generating device is used for generating femtosecond laser, the femtosecond laser is emitted into the optical system to obtain modulated femtosecond laser, the modulated femtosecond laser is firstly emitted into the composite target middle target I in parallel and then is vertically emitted into the target II, the femtosecond laser interacts with the composite target to obtain an accelerated electron beam, and the accelerated electron beam is emitted into the femtosecond laser. And after passing through the focusing magnetic field, the electron beam is sequentially emitted into a beam detector and an electron spectrometer to obtain an energy spectrum of the electron beam, so that ground simulation of electron radiation environments of different orbits in space can be realized.

The invention relates to the technical field of laser, and discloses a higher harmonic and threshold ionization coordinated regulation and control method and system, fundamental frequency light and multiple paths of auxiliary fields are adopted to form a space-time overlapped composite laser field, and a multi-parameter laser field is formed by adjusting the wavelength, intensity, delay time and polarization direction of the auxiliary fields. A multi-parameter laser field is used as a physical action carrier; on the basis of a multi-parameter laser field, a high-sensitivity spectrograph and an electron spectrometer are used for synchronously collecting HHG spectral intensity distribution and ATI electron energy spectrum data, the HHG spectral intensity distribution and the ATI electron energy spectrum data are input into a Bayesian optimization algorithm, laser parameters are dynamically adjusted, and an optimal laser parameter combination is obtained; on the basis of the obtained optimal laser parameter combination, the electron re-collision probability is controlled by adjusting laser elliptic skewness, the electron ionization moment and return energy are regulated and controlled by using a two-color field carrier envelope phase, the HHG cut-off frequency and the ATI energy spectrum peak position are synchronously optimized, and closed-loop control is achieved; according to the invention, cooperative regulation and control of higher harmonic generation and threshold ionization process are realized.

The present invention provides a method and system for simulating the electron radiation environment in a space orbit. The system comprises a femtosecond laser system, an optical system, a composite target, a magnet, a beam detector, and an electron spectrometer, all connected in sequence. The method for simulating the electron radiation environment in a space orbit using this system includes acquiring target orbit information and obtaining electron energy spectrum information corresponding to the target orbit; while keeping the laser and target II parameters fixed, varying the density and length of target I, collecting information on the energy and number of electron beams generated by target II, and obtaining electron beam energy spectrum information as well as its corresponding electron temperature and electron cutoff energy; when the electron temperature and electron cutoff energy obtained by adjusting the density and length of target I match those of the target orbit, the target orbit electron radiation environment is obtained. The present invention enables ground-based simulation of the electron radiation environment in a space orbit, filling a gap in the field of ground-based simulation of radiation environments in different orbits.