Patent ID: 11874414
Assignee: TSINGHUA UNIVERSITY
Field: Environmental technology (Chemistry)
Classification: CPC G  C  H | IPC C  G

Claim 12:
13. A method for measuring an electron beam comprising:
step (S1), providing a device for measuring electron beam, wherein the device comprises:
a Faraday cup comprising an opening;
a porous carbon material layer located on a surface of the Faraday cup and suspended via the opening, wherein a portion of the porous carbon material layer suspended in the air at the opening is defined as a suspended portion, a length of the suspended portion is greater than or equal to a maximum diameter of an electron beam to be measured; a diameter or a width of the porous carbon material layer is smaller than a minimum diameter of a cross section of the electron beam to be measured; and the porous carbon material layer comprises a plurality of carbon material particles, and a plurality of micro gaps are defined by the plurality of carbon material particles; and
an electricity meter electrically connected to the porous carbon material layer;

step (S2), moving the electron beam to be measured for a first distance relative to the porous carbon material layer, the cross section of the electron beam to be measured passing through and scanning the suspended portion of the porous carbon material layer; and recording the first distance and a first electric signal value in the electricity meter to obtain a first curve, and analyzing the first curve to obtain a first diameter of the electron beam to be measured; and
step (S3), rotating the electron beam to be measured or the porous carbon material layer by an angle; moving the electron beam to be measured for a second distance relative to the porous carbon material layer, the cross section of the electron beam to be measured passing through and scanning the suspended portion of the porous carbon material layer; and recording the second distance and a second electric signal value in the electricity meter to obtain a second curve, and analyzing the second curve to obtain a second diameter of the electron beam to be measured.