52 results about "Ion current density" patented technology

Ion sources and methods of operating an electromagnet of an ion source for generating an ion beam with a controllable ion current density distribution. The ion source (10) includes a discharge chamber (16) and an electromagnet (42; 42a-d) adapted to generate a magnetic field (75) for changing a plasma density distribution inside the discharge chamber (16). The methods may include generating plasma (17) in the discharge space (24), generating and shaping a magnetic field (75) in the discharge space (24) by applying a current to an electromagnet (42; 42a-d) that is effective to define the plasma density distribution, extracting an ion beam (15) from the plasma (17), measuring a distribution profile for the ion beam density, and comparing the actual distribution profile with a desired distribution profile for the ion beam density. Based upon the comparison, the current applied to the electromagnet (42; 42a-d) may be adjusted to modify magnetic field (75) the magnetic field in the discharge space and, thereby, alter the plasma density distribution.

Ion sources and methods for generating an ion bean with a controllable ion current density distribution. The ion source includes a discharge chamber having an optical grid position proximate at a first end and a re-entrant vessel positioned proximate a second end that opposes the first end. A plasma shaper extends from the re-entrant vessel and into the plasma discharge chamber. A position of the plasma shaper is adjustable relative to the grid-based ion optic such that the plasma shaper may operably change a plasma density distribution within the discharge chamber.

Ion sources and methods for generating an ion beam with a controllable ion current density distribution. The ion source includes a discharge chamber and an electromagnet adapted to generate a magnetic field for changing a density distribution of the plasma inside the discharge chamber and, thereby, to change the ion current density distribution.

Methods of operating an electromagnet of an ion source for generating an ion beam with a controllable ion current density distribution. The methods may include generating plasma in a discharge space of the ion source, generating and shaping a magnetic field in the discharge space by applying a current to an electromagnet that is effective to define a plasma density distribution, extracting an ion beam from the plasma, measuring a distribution profile for the ion beam density, and comparing the actual distribution profile with a desired distribution profile for the ion beam density. Based upon the comparison, the current applied to the electromagnet may be adjusted either manually or automatically to modify the magnetic field in the discharge space and, thereby, alter the plasma density distribution.

The invention discloses an ion spatial electric current density-based direct current transmission line mountain fire monitoring device which comprises an ion electric current density and environment parameter monitoring module for measuring ion electric current density, wind speed and wind direction, temperature, humidity and atmospheric pressure of a direct current transmission line, a mountain fire judging and early-warning module for judging whether a mountain fire exists or not according to the ion electric current density and the environment parameter, a communication module for transiting early warning information and receiving status instructions of the ion electric current density and environment parameter monitoring module, a control center for receiving the early warning information from the communication module to control each status instruction and acousto-optic alarm instruction of the ion electric current density and environment parameter monitoring module, and an acousto-optic alarm module for informing operators to report to power dispatching persons whether to stop using the line or dispatch line maintainers to remove hidden danger or not according to the early warning information received by the control center. The device is convenient to use and maintain, can stably monitor the basic environment parameters around the direct current transmission line running in case of high voltage such as wind speed, wind direction, temperature, humidity, atmospheric pressure and the like, computes the ion electric current density nearby measure points according to the basic parameters such as the wind speed and the wind direction, judges the mountain fire nearby the transmission line according to the ion electric current density, transmits the alarm information to the control center by the wireless communication unit, and timely prompts operators on duty by the acousto-optic alarm information which cooperatively controls a master computer.

A film deposition process for depositing an amorphous metal oxide film, for example, an amorphous tantalum oxide film and a film treatment process for improving film quality of the amorphous tantalum oxide film in the state in which an amorphous state of the amorphous metal oxide film is being maintained by a high-density plasma radiation treatment based upon ion and radical reactions and which contains at least oxygen at an ion current density higher than 5 mA / cm2 are carried out, whereby a low-temperature treatment in the whole process is made possible. In addition, since the amorphous metal oxide film, which is excellent in film quality, can be deposited, the amorphous metal oxide film can be made high in reliability and can be produced inexpensively. The amorphous tantalum oxide film which is excellent in film quality can be manufactured inexpensively by a low-temperature treatment. Also, when a capacitance element having an amorphous metal oxide film and a semiconductor device are manufactured, the amorphous metal oxide film which is excellent in film quality can be deposited by a low-temperature treatment and highly-reliable capacitance element and semiconductor device can be manufactured.

The invention provides a DC field conductor structure of a + / - 160 kV flexible DC converter station. The DC field conductor structure comprises at least one DC field conductor and electrical devices where the DC field conductors can be erected on. The top of each electrical device is provided with a fixing point for installation of the DC field conductor. The distance between each fixing point and the mounting surface of the corresponding electrical device ranges from 6.5 meters to 7.5 meters. In this way, the DC field conductor will not generate coronas or the generated coronas are small, the DC field conductor is not prone to malfunction and damage, and the reliability and stability of the flexible DC converter station are improved. In addition, on the premise of not increasing corona loss, the total electric field strength of the ground below the conductor, the ion current density of the ground below the conductor and limiting values of electromagnetic environment such as radio interference generated by the conductor can be met, the electromagnetic pollution is little, the design scheme of the electrical devices in a DC transmission project is optimized, and the construction cost of the electrical devices is saved.

The invention discloses an ion gate control method for automatically enriching ions, which realizes the improvement of the detection sensitivity of the ion mobility spectrum. During the opening of the ion gate, the two groups of gate electrodes maintain the same potential to form a uniform initial electric field in the ion transfer tube; during the closing period of the ion gate, the potential of one of the gate electrodes is raised to make it close to the ion gate in the ionization region. The ring electrode maintains the same potential, forming an ion-enriching electric field that gradually decreases along the direction from the ion source to the ion gate in the ionization region; the intensity of the ion-enriching electric field is lower than that of the initial electric field, and the ions generated by the ionization source move toward the ion gate. During the process, the ion number density increases; when the ion gate is opened again, the initial electric field is restored in the ionization region, and the ion current density of the enriched ions in front of the ion gate is enhanced, so that stronger ions can be obtained under the same effective opening time of the ion gate. peak signal. The invention does not require special modification of the ion transfer tube, and the method is simple and universal.

The invention discloses a method for synchronously determining a boundary electric field and current density of a diode. The method comprises the following steps: 1, giving two electron current density initial values and an ion current density initial value; 2, substituting the initial value of the electron current density and the initial value of the ion current density into a Poisson equation to obtain a corresponding cathode boundary electric field value; 3, predicting an electron current density value; 4, obtaining a new cathode boundary electric field value based on the predicted electron current density value, and judging whether the new cathode boundary electric field value meets the required cathode boundary condition or not; 5, giving a new ion current density value, and executing the step 1 to the step 4 to obtain two anode boundary electric field values; 6, predicting an ionic current density value; 7, predicting an anode boundary electric field value, and judging whether the predicted anode boundary electric field value meets the required anode boundary condition or not; and 8, outputting the final electron and ion current density.