Fiber Installation

Fiber Installation 9/3/2014

The tagger microscope was delivered to Jefferson Lab on September 3, 2014 with the fiber travelers document found here. The initial placement of fibers was determined by placing the bundle with the highest average photon yield in the most upstream position and working downstream with the next highest average photon yield bundle.

Popsicle Stick	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Bundle No.	9,10	7,8	13,14	11,12	1,2	3,4	5,6	21,22	15,16	27,28	17,18	31,32	19,20	29,30	33,34	37,38	35,36	empty
Avg. Photon Yield	879	841	784	755	688	533	521	489	486	429	364	285	422	275	243	232	190	empty
Ind. Readout?	No	Yes	No	No	Yes	No	No	No	No	No	No	No	No	Yes	No	No	Yes	No

Spare bundles: (23,24), (25,26), and (39,40) with average photon yields 145, 137 and 74, respectively.

During the installation a couple fibers had to be interchanged with a neighboring fiber due to a fiber not fitting in the chimney. These changes occurred in positions that are only read out through a summing circuit.

• From bundle 3, fiber 5 (3:5) is now located in chimney slot 4.
• From bundle 3, fiber 4 (3:4) is now located in chimney slot 5.

• From bundle 6, fiber 8 (6:8) is now located in chimney slot 9.
• From bundle 6, fiber 9 (6:9) is now located in chimney slot 8.