Technical Brief
“The shunt is the core element of the LHC machine consolidation plan. Its function is to ensure, in all operation conditions, the electrical continuity of the bus bar copper stabiliser in the 13 kA splices in order to avoid local high electrical resistance.
The main features of the shunt are:
• Rectangular shape 15 x 50 mm, 3 mm thickness;
• Rounded edges to avoid or at least reduce tendency to arc ignition at sharp edges;
• One hole for a pilot temperature probe to steer the temperature cycle;
• 3 venting holes and transverse/longitudinal grooves at the back side to facilitate flow of solder on the entire contact surface. Absence of burrs to assure an appropriate flow of the solder;
• Pick-up holes for electrical resistance measurements;
• 2 holes of ? 7 mm for filler material (Sn60Pb40 solder pellet The solder pellets should be inserted through the side of the piece without grooves;
• Surface roughness «as rolled plate» (roughness 0.25µm);
• RRR=300. The shunt shall be annealed at 400 °C for 2 hours in the end of the manufacturing process to maximize RRR.”

If you are interested in this project, please contact Jihan at tenderopportunities@stfc.ac.uk with your full contact details and address ASAP.