The R649 is a head-on photomultiplier tube for photon counting, featuring a multialkali photocathode with a minimum effective area of 5 × 8 mm and a spectral response from 300 to 850 nm, peaking at 420 nm. It has a 21-pin glass base with a supplied E678-21C socket, 12 dynode stages, and operates at up to 1500 V applied between anode and cathode. The anode gain is specified as 6.7 × 10^6, with a maximum anode dark count of 350 s^⁻¹ and an anode pulse rise time of 13 ns. Operable within -30 to +50 °C, it uses borosilicate glass for its window and has a typical radiant cathode sensitivity of 51 mA/W at 420 nm.
51mm dia., Head-on type, Multialkali photocathode (Effective area : 5 mm x 8 mm /Spectral response : 300 nm to 850 nm)
| Hamamatsu Photonics Europe | |
|---|---|
| Product Category | Photomultiplier Tubes |
| Product Number | R649 |
| Product Name | Photomultiplier tube (Tube alone), Head-on type |
| Photomultiplier Type | End-on |
| Active Area Diameter or Length | 5 mm (0.1969 inch) |
| Active Area Height | 8 mm (0.3150 inch) |
