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Setup

The fiber and trigger PMT's were fastened on a dexion support stand, and each fiber ribbon was mounted on a 2x4 piece of lumber which was nailed onto a 4 m long 4x4 piece that was positioned at beam height. The 4x4 was moved progressively past the beam focus to put the appropriate spot of the fibers in the beam for our length scan, in order to extract the attenuation length. This process allowed for a robust coupling of the fibers to the PMT's.

With its axis oriented at an angle of 90$^\circ$ with respect to the beam, the fiber bundle was placed between a large paddle counter (PR) and a finger counter (TR) 1 cm wide and 4 cm in height, as depicted in Figure 5. Two additional counters (PF and PD) were placed immediately after the beam pipe vacuum window and at the back wall of the area, spaced 413 cm apart. Photographs of the experimental setup are shown in Figure 5.

Figure 5: Experimental setup at TRIUMF. Diagram: FL and FR represent the PMT's connected to the ends of the fiber bundles, TR is the small trigger counter and PR a larger paddle counter behind the fibers. The event coincidence was $TR \cdot PR \cdot RF$. Counters PF and PD were used to calculate the TOF in the experimental area. Photographs: the experimental setup on August 13, 2001.


\includegraphics [height=60mm,angle=0,clip=]{triumf_setup.eps} \includegraphics [height=94.5mm,angle=-90,clip=]{expt1.ps} \includegraphics [height=94.5mm,angle=-90,clip=]{expt2.ps}


next up previous
Next: Measurements and Results Up: TRIUMF Tests Previous: TRIUMF Tests
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2001-10-29