Title :
Laser-based calibration for the HARP time of flight system
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 :
Dipt. di Fisica G. Occhialini, INFN, Milano, Italy
Abstract :
A precise calibration and monitoring system has been developed for the HARP experiment scintillator-based time of flight system. An Nd-YAG laser with passive Q-switch and active/passive mode-locking and a custom-made laser light injection system based on a bundle of IR monomode optical fibers were used. The laser pulse timing was provided by a novel ultrafast InGaAs MSM photodiode, with 30 ps risetime. Experience over a several month data taking period in 2001 and 2002 shows that drifts in timing down to about 70 ps can be traced.
Keywords :
calibration; photodiodes; scintillation counters; solid lasers; timing; 70 ps; HARP; InGaAs; InGaAs MSM photodiode; Nd-YAG; Nd-YAG laser; Nd-YAl5O12; active/passive mode-locking; calibration; laser pulse timing; passive Q-switch; scintillation detector; time of flight system; timing; Bonding; Calibration; Fiber lasers; Free electron lasers; Laser mode locking; Neutrino sources; Optical pulses; Radiation detectors; Time measurement; Timing;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2003.814545
