Detector Description

detector consists of :

2- U-233 is used as a Neutron fissionable material which is coated on the top of metal plate in circular disk that has a diameter of 3cm. U-233 think film is fixed as a part of the detector cathode.

3- Cathode , square copper plate has a dimension of 10x10cm and has a ditance of 1.6 cm from the top of the fist GEM card.

3- GEM cards: the detector has three GEM in square plastic of frame and has dimension of 10x10cm, it is placed parallel to the cathode.

All the previous components exist in a plastic chamber, the chamber has been sealed to insulate the chamber has from the atmospheric gas components.

The chamber has a square window of kipton of dimension of 13x13cm.

The detector operates by providing the high voltage circuit by two channel high voltage power supply up to 3.1 kV for the cathode, and up to 2.8 kV for the GEM cards.

The circuit diagram is shown in the figure below:

The circuit will make the potential difference between the top and the bottom of each card 300-350 V.