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We use a nitrogen Laser that provides UV laser pulses at 337 nm
from 1 to 50 Hz repetition rate. The output power is 250 
J.
It is located in a designated area in the Counting House of Hall C.
The laser is enclosed in an aluminum box where the laser light is directed
onto a scintillation fiber after passing through two optical filters
to optimize the light output.
The laser light is absorbed in the scintillation fiber
and converted to visible blue scintillation light. Both ends of the
scintillation fiber are coupled using CT connectors, mounted on an
aluminum casing, to regular
1 mm diameter multimode plastic optical fibers. One fiber output is
connected to a PIN diode to monitor the light output; the other
fiber is brought downstairs into Hall C where it is connected to
a distribution box (1:24) located in the cupboard below the pivot. From
this distribution box 4 fibers are running to the HMS spectrometer and
4 to the SOS spectrometer, where they
are connected again to distribution boxes (1:64). The individual
outputs of the final distribution box are connected to the scintillators
and lead glass shower counters. The light pulses in the detector
produce a trigger in the data acquisition system and ADC and TDC
information is read out. Normalizing the peak positions of the light
pulses to the PIN diode ADC value is a tool to monitor the gain of
each photo multiplier tube throughout the experiments.
Next: Laser Operation
Up: Hall C Laser Pulser
Previous: Hall C Laser Pulser
Hall-C Staff
2002-11-04