Weekly Briefs Archives

May 29, 1991 - Blue Sheet

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Project Progress Summary

May 29, 1991

FET Operations

  • Measured Q’s and gradients in the second cryomodule and turned cryomodule over for beam tests. Performance exceeds specs. (See WBS 1 report.) One tuner is out of the frequency range.
  • Debugging of RF controls is under way.

WBS 1

  • Eight fundamental power coupler extensions machined to custom dimensions with a turnaround time less than 48 hours.
  • The fourth axis for the CNC mill has been received. Together with new fixturing, this will permit easy set-up changes and FPC customizing.
  • The purchase order has been placed for the lapping machine; it will be delivered in August.
  • Sixteen niobium waveguide sections have been machined for window and flange sealing test fixtures.
  • Two additional windows were electron-beam welded. Six windows were brazed last week.
  • Investigation continues on the leak issue. Three windows which were lapped as the last step leaked upon assembly. Three windows which were chem polished as the last step were vacuum tight upon assembly. The lapped flanges will be retested after chem polishing.
  • Cryomodule traveler 006 was commissioned Friday. Results show 6.5 MV/m for each cavity and the Q’s are greater than or equal to two to three times the design. All vacuums are excellent.
  • Cryomodule traveler 007 is being assembled. The helium circuits are welded up and the final leak check on the remaining two cryounits will be done this week. It will be tested the week of 3 June.
  • Completed the second cavity pair last Friday for cryomodule traveler 008. Installation of the first pair into the helium vessel is proceeding.

WBS 2

Magnets:

  • The drawings and specifications for the arc corrector dipole (BC) were signed off.
  • The request for proposals for the dogleg and spreader/recombiner dipoles was sent to 39 vendors.

Stands:

  • The second shipment of 500 adjustment cartridges (out of 2802) was received.

Survey and Alignment:

  • The second cryomodule and its associated magnetic elements in the injector were given their final alignment.

WBS 3

RF Power:

  • Received six high-voltage power supplies from the vendor. Two are installed in the south linac.
  • Twenty HOM filters shipped from Gamma Microwave. They plan to increase production to 20 units per week.
  • Full load test on one of the power supply line reactors indicated that additional cooling is needle. This will be provided by having space between winding layers.

Checkout:

  • Injector IN04 (second cryomodule) RF system checked out and operated to 1500 watts, all eight klystrons.

WBS 4

  • Installed sixth trim rack (located in east end of north linac service building). Fifth trim rack was connected to a dummy load and tested.
  • Continued installation of HPOA supports in south linac.
  • Electricians performed a “pull-down” of AC wiring in arcs to get correct information for use in as-built documentation.

WBS 5

  • All linac BPM’s (50 for north and south linac) in hand.
  • First of the arc monitors arrived.
  • North linac BPM electronics assembled., Will be tested during coming weeks.
  • Altogether 70 beam viewers (of 110 for the whole machine) assembled and tested.
  • New software for 8-seater installed and successfully tested.
  • Software for first 8-seater copied for second 8-seater with new program.
  • Work continued on networking codes to speed up communication between computers.
  • Several modifications on manager code and run-time display programs.

WBS 6 – No report received.

WBS 7

  • Connected 05 cryomodule. It has been filled with liquid and the entire injector is at 2 K.
  • Finished leak checking the shield of the return transfer line in the injector area.
  • Starting to clamshell the outer line of the return transfer line.

WBS 8

  • The form-work decking for the Hall A dome is complete. The subcontractor is installing reinforcing steel, crane supports, and various pipe penetrations.
  • All first-lift wall sections are now complete in Hall A. The three remaining second-lift sections should be complete by 7 June.
  • Concreting continues on the walls and roof slabs for truck access ramp B.
  • Backfilling continues around the beam dumps, truck ramps, and Hall A and C.