Top stringer in a drift chamber for CLAS12 project

A top stringer work instructions

The top stringer is responsible for

1- Dropping the wire that has a length extends from the top feed through to the bottom feed. The wire should have an additional length that has a range of 10-12" after the wire comes out of the bottom feed through.

2- crimp the pin that holder the wire in the top feed through.

3- Observe if any changes take place inside the chamber through the stringing time.

The top stringer has tools to drop that wire such as chains (hand made), a wire cutter, a crimper, torch, and a feeler gauge. A left is used to help the top stringer to reach the top of the chamber which is placed to take advantage of the gravity to vertically drop the wire inside it.

Procedure to drop the wire

The chamber location is in a clean room, before following the next procedure, the stringer is expected to follow all the clean room instructions that include safety instructions to be in a clean and safe working environment for him (her) and the other co-workers.

The top stringer is going to :

1- locate and Raise up the left to a height that helps to see the all the top and top feed through rows that he is going to string distinguishing their locations. (The rows are numbered for accuracy).

2- Be sure that the stringing machine is in an appropriate location (the bottom stringer helps to relocate if needed), and the wire is stretched around the machine's pulleys.

3- Feed the free end of wire gently into a rubber snot, then the sharp end of chain in a depth that prevent any of them to separate as they are dropped inside the chamber.

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the bottom feed through has the same row and order number as the top one's numbers.