Construction of a fast laser-based calibration system for the Harp TOF counters wall

Author

Bonesini, M. ; Ferri, F. ; Govoni, P. ; Paganoni, M. ; Parravicini, A. ; Tonazzo, A. ; Andreoni, A. ; Bondani, M. ; Paleari, F. ; Spinelli, A.S. ; Gibin, D. ; Guglielmi, A. ; Menegolli, A.

Author_Institution

INFN, Milano, Italy

Volume

1

fYear

2002

fDate

10-16 Nov. 2002

Firstpage

78

Abstract

A calibration and monitoring system for the Harp experiment scintillator-based time of flight system has been developed, by using an Nd-YAG laser with passive Q-switch and active/passive mode-locking and a custom made laser light injection system based on it bundle of IR monomode optical fibers. For the laser pulse timing a novel ultrafast InGaAs MSM photodiode, with 30 ps risetime, has been used. Experience over a several months data taking period in 2001 and 2002 shows that drifts in timing down to about 70 ps can be traced.

Keywords

calibration; measurement by laser beam; photodiodes; solid lasers; solid scintillation detectors; 30 ps; Harp; InGaAs MSM photodiode; Nd-YAG laser; TOF counters; YAG:Nd; YAl5O12:Nd; active/passive mode-locking; laser-based calibration system; passive Q-switch; risetime; Calibration; Counting circuits; Fiber lasers; Indium gallium arsenide; Laser mode locking; Monitoring; Optical fibers; Optical pulses; Radiation detectors; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2002 IEEE

Print_ISBN

0-7803-7636-6

Type

conf

DOI

10.1109/NSSMIC.2002.1239272

Filename

1239272