Development of a new photomultiplier tube with high sensitivity for a wavelength-shifter fiber readout

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 522; no. 3; pp. 477 - 486
• Main Authors: Itaya, M, Inagaki, T, Iwata, T, Lim, G.Y, Oishi, H, Okuno, H, Tajima, Y, Yoshida, H.Y, Yoshimura, Y
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.04.2004
• Subjects: Darkcurrent; Photomultiplier tube (PMT); Prism photocathode; Quantum efficiency (QE); Time response; Wavelength-shifter (WLS) fiber readout; 29.90.+r; 29.40.Mc; Quantum efficiency (QE); Darkcurrent; Photomultiplier tube (PMT); Prism photocathode; Time response; 29.40.Vj; Wavelength-shifter (WLS) fiber readout
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2003.11.201

We have developed a new photomultiplier tube (PMT) with high sensitivity for a wavelength-shifter fiber readout of plastic scintillators. Improvements of the photoelectron yield were made on a 2-in. PMT (Hamamatsu R329) by adopting (1) a prism-shaped photocathode, (2) an extended-green photocathode material, and (3) an optical mirror surface of the electrodes. As a result, the number of photoelectrons obtained by the new PMT has increased to be 1.8-times that by R329. Other PMT characteristics, such as uniformity of sensitivity, time response and darkcurrent are not so much different from those of R329 for practical applications.