Bus Work Status R Bossert 1052020 Bus and
Bus Work Status R. Bossert 10/5/2020
Bus and Expansion Loop Status • Assembly and detail drawings for the bus and expansion loops are 100% complete. The drawing will be released this week. The spreadsheet for the Q 1/Q 3 parts list and current updated models of the cold mass and cryostat are being placed into docdb. • The first two busses for the Q 2 prototypes have been received by CERN. A detailed procedure for CERN personnel of the bus insertion and expansion loop forming is close to completion and will be discussed with CERN personnel this Thursday Oct 8. A demonstration for CERN personnel of the expansion loop forming on our mockup is also being done. • All parts for Q 2 expansion loop forming and support have been received. Inspection is complete. They will be included in a kit for this process and sent to CERN. • Bus insertion into the Q 1/Q 3 practice cold mass and forming of the expansion loops was successful. Final setting of the leads as they exit cold mass will be done this week. • Talks are ongoing to plan the special wiring for the first pre-series cold mass (MQXFA 03). Activity on this task began with discussions between Luke Martin, Thomas Strauss and Rodger Bossert last week. Voltage tap wiring spreadsheets are nearly complete. A plan for removal of strain gauges is in process. Strip heater wiring is next. • New design for the Qa and Qb splice fixtures has been completed, and Fermilab stock heating elements will be used. Drawings have been checked, and will be released for fabrication his week.
Bus and Expansion Loop Status • An order for bus housing parts for two more Q 1/Q 3 and two more Q 2 busses has been received. The clips were rejected an order has been made for replacements. The new clips are due to arrive at Fermilab this week. Hardware order for all bus housings and end hold down parts is being done by procurement. • Bus soldering and wrapping fixtures have received ORC approval for production. • All busses for Q 2 prototypes and Q 1/Q 3 preseries magnets are soldered. Some minor rework of the bus soldering fixture will take place before soldering of the production busses begins. Bullet #1, addition of thermocouples, has been done. Temperature tests have been done with a new 11 meter element. Strand sample testing been completed, at a range of temperatures between 220 C and 320 C. Bullet #2, cold block design, still needs to take place. Bullet #3 has not been started. o More thermocouples will be added to allow more detailed monitoring of the temperature. o “Cold Blocks” will be implemented to better prevent solder from wicking into the nonsoldered area. Parts for the cold block and soldering cart have been procured and design on this part is underway. o A second temperature will be added to the program to allow the bus to be heated to an intermediate level after soldering to facilitate removal from the fixture.
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