研究目的
To develop a new method for measuring weak electric fields in vacuum and in a plasma using the emission of Lyman-α radiation by a low-energy metastable hydrogen atom beam due to Stark-quenching of the 2s level induced by the field.
研究成果
The EFILE diagnostic proves to be very useful and efficient for measuring electric field values as low as 1 V/cm in vacuum and plasmas. It provides a direct measurement of the electric field modulus without disturbing the equilibrium of the system being studied.
研究不足
The technique is sensitive to electric fields as low as 0.1 V/cm, but the actual experimental resolution depends on the beam current and the detection system. The method may be affected by the presence of other charged species in the beam and the geometry of the electric field.
1：Experimental Design and Method Selection:
The technique is based on the emission of Lyman-α radiation by a low-energy metastable H atom beam due to Stark-quenching of the 2s level induced by the field. Test measurements were performed in vacuum between two plates polarized at a controlled voltage.
2：Sample Selection and Data Sources:
A low-energy metastable hydrogen atom beam is used as the sample. The intensity of emitted radiation is recorded.
3：List of Experimental Equipment and Materials:
The setup includes a hydrogen ion source, a cesium cell for producing metastable atoms, a test chamber with a two-plates assembly to create a variable electric field, and a photomultiplier to measure the Lyman-α radiation.
4：Experimental Procedures and Operational Workflow:
The beam is sent into a measurement chamber where an electric field is applied. The Lyman-α emission is collected perpendicular to the beam and recorded using a lock-in technique for improved signal to noise ratio.
5：Data Analysis Methods:
The intensity of the Lyman-α line is proportional to the square of the electric field modulus, allowing for the determination of the electric field strength.
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