Photomultiplier and its manufacturing method

A photomultiplier, comprising:

• an enclosure having an internal space kept in a vacuum state, the enclosure comprising an upper frame, a lower frame opposing the upper frame, and a side wall frame provided between the upper frame and the lower frame;
• a photocathode, accommodated in the enclosure, emitting photoelectrons to the inner space of the enclosure in response to light incident on the photocathode;
• an electron multiplying section accommodated in the enclosure while being fixed on one of the upper frame and the lower frame, the electron multiplying section cascade-multiplying the photoelectrons along a cascade-amplification direction extending from one end to the other end of the electron multiplying section;
• an anode accommodated in the enclosure while being arranged at the other end side of the electron multiplying section;
• and
• a transmitting window through which light to be incident on the photocathode passes, the transmitting window being arranged in a region of the side wall frame where faces the one end of the electron multiplying section.

A photomultiplier, comprising:

• an enclosure having an internal space kept in a vacuum state, the enclosure comprising an upper frame, a lower frame opposing the upper frame, and a side wall frame provided between the upper frame and the lower frame;
• a photocathode, accommodated in the enclosure, emitting photoelectrons to the inner space of the enclosure in response to light incident on the photocathode;
• an electron multiplying section accommodated in the enclosure while being fixed on one of the upper frame and the lower frame, the electron multiplying section cascade-multiplying the photoelectrons along a cascade-amplification direction extending from one end to the other end of the electron multiplying section;
• an anode accommodated in the enclosure while being arranged at the other end side of the electron multiplying section;
• and
• a transmitting window through which light to be incident on the photocathode passes, the transmitting window being provided between the upper frame and the lower frame, and located so that the transmitting window and the anode sandwich the electron multiplying section along the cascade-amplification direction.