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Improved lifetime of microchannel-plate PMTs

Authors :
W. Lauth
A. Gerhardt
Euan N. Cowie
W. Eyrich
K. Götzen
M. Patsyuk
T. Keri
R. Dzhygadlo
Harphool Kumawat
K. Föhl
M. Zühlsdorf
A. Hayrapetyan
B. Kröck
A. Lehmann
Paul Alois Buhler
K. Peters
G. Rosner
R. A. Montgomery
Ken Suzuki
C. Schwarz
O. Merle
L. Schmitt
R. Hohler
Johann Marton
M. Hoek
G. Kalicy
J. Rieke
Michael Düren
Michaela Thiel
V.Kh. Dodokhov
Concettina Sfienti
L. Gruber
J. Schwiening
D. Lehmann
M. Cardinali
Patrick Achenbach
B. Lewandowski
A. Britting
F. Uhlig
G. Schepers
M. Traxler
Source :
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 766:138-144
Publication Year :
2014
Publisher :
Elsevier BV, 2014.

Abstract

The charged particle identification at the PANDA experiment will be mainly performed with DIRC detectors. Because of their advantageous properties the preferred photon sensors are MCP-PMTs. However, until recently these devices showed serious aging problems which resulted in a diminishing quantum efficiency (QE) of the photo cathode. By applying innovative countermeasures against the aging causes, the manufacturers recently succeeded in drastically improving the lifetime of MCP-PMTs. Especially the application of an ALD coating technique to seal the material of the micro-channels proves very powerful and results in a lifetime of ≈ 6 C / cm 2 integrated anode charge without a substantial QE degradation for the latest PHOTONIS XP85112. This paper will present a comparative measurement of the lifetime of several older and recent MCP-PMTs demonstrating this progress.

Details

ISSN :
01689002
Volume :
766
Database :
OpenAIRE
Journal :
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Accession number :
edsair.doi...........fd65dcc196dda77b76a9560c003ccded