LASER-BASED CALIBRATION FOR THE HARP TIME OF FLIGHT SYSTEM
- M., Bonesini
- F., Ferri
- P., Govoni
- M., Paganoni
- A., Parravicini
- A., Tonazzo
- A., Andreoni
- M., Bondani
- F., Paleari
- A. S., Spinelli
- Gibin, Daniele
- A., Guglielmi
- A., Menegolli
Publication date
January 2003
DOI Publisher
Institute of Electrical and Electronics Engineers (IEEE) ISSN
0018-9499Abstract
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
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