Fiber Testing Procedure

It is important to determine light yield of each fiber before shipment to Jefferson Lab. In order to do this, light yield tests will be performed on each fiber in our dark box using a red laser diode on a pulsing circuit. The setup of the fibers is very important, as any offset fibers could give an inaccurate result. It is also important that procedure is followed to prevent damage to electronics.

If the electronics are powered and the dark box is open, the siliconphotomultipliers WILL be damaged, so it is very important to make sure electronics are off before the dark box is opened.

Procedure

• Before taking any fibers out of the dark room, open the Fiber testing spreadsheet and click on the tab titled "Fiber Tests 2." In this tab, the fibers to be tested have been put in the appropriate chimney slot column and in the matrix placement of fibers.

• Before selecting fibers from their dark room, don a pair of powder free gloves and place the popsicle stick with the testing clamp at the table you will be working.

• Note which fibers are to be tested during the run and take only those fibers out of the dark room.

• If no meeting is going on in the conference room, bring the fibers in there and turn off all the lights.

• Using the matrix in the spreadsheet as a guide, split the fibers in to the appropriate 3 columns of 5 fibers.

• Start with one column and put the fibers from that column in their appropriate order per the matrix on the spreadsheet.

• Continue this process with the remaining two columns.

• Once the fibers are in the order they belong, begin placing them in the clamp on the popsicle stick.
  • This step will take two people. One person should place the fibers, while the other should hold them in place once they are placed. This way fibers will stay in their appropriate positions.