Abstract
This paper describes the design of a high-speed, single-photon sensitive, Hybrid Photon Detector (HPD). The detector consists of a vacuum tube, containing a Micro Channel Plate (MCP) and 4 CMOS pixel readout chips, sealed with a transparent optical input window with a photocathode. The design described here utilizes currently available technologies, specifically the Timepix readout chips and the Photonis Planacon MCP-PMT vacuum tubes. The aim of the project is to demonstrate the feasibility of a 4-side buttable square MCP-HPD with high packing fraction sensitive area. Presented here is the mechanical and thermal design of the prototype detector.
Highlights
The design described here utilizes currently available technologies, the Timepix readout chips and the Photonis Planacon Micro Channel Plate (MCP)-PMT vacuum tubes
The prototype tube design is based on a Photonis Planacon 80512 MCP- Photon Multiplier Tube (MCP-PMT) vacuum tube body shown in figure 1
The optical input window and the MCP are mounted on the metal rings, which provide bias voltages to the photocathode and to the MCP as well as activation currents for the getter pumps placed inside the tube
Summary
The prototype tube design is based on a Photonis Planacon 80512 MCP- Photon Multiplier Tube (MCP-PMT) vacuum tube body shown in figure 1. The tube dimensions are 58 mm x 58 mm x 13.7 mm and it has a very good open area fraction of ∼75 %. The Planacon tube body is constructed of interleaved ceramic and metal rings and a ceramic anode plate that are brazed together to form a vacuum tight body. The optical input window and the MCP are mounted on the metal rings, which provide bias voltages to the photocathode and to the MCP as well as activation currents for the getter pumps placed inside the tube. Photonis offers a large selection of photocathode materials, of which the UV sensitive SE20-UV was selected for the prototype
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