RFD Update Jan 13 2017 RFD 1 Weld

RFD Update Jan 13 2017 RFD #1 • Weld prep BCP complete, parts ready for final weld. RFD #2 • Weld rework done but results not totally satisfactory (weld under bead is not fully developed). • May proceed without any more rework – discussion on -going.

RFD Frequency Tracking • RFD frequency was measured vertically without frame and horizontally with the frame. • The frequency difference between two configurations were smaller before trimming but grew larger after trimming. Vertical setup without frame Horizontal setup without frame

RFD #1 Frequency Tracking Process Frequency [MHz] Receiving 400. 93 Freq fix 399. 09 After annealing 399. 18 After tuner tab welding 399. 20 With frame 399. 47 After trimming 2. 1 mm total cut 399. 76 After weld edge thinning 399. 79 After bulk BCP all parts (VHOM twice) Stacked vertically, no frame 399. 07 Horiontal set up with frame 399. 84 * Frequency in MHz, environmental condition not factored.

RFD #2 Frequency Tracking Process Receiving After tuner tab welding, both end group bulk BCP With frame After trimming 4. 06 mm total cut After weld edge thinning After bulk BCP center body Stacked vertically, no frame Horiontal set up with frame After final weld, no frame After rib tacks, no frame Frame back on Frequency [MHz] 398. 93 398. 66 399. 26 399. 81 399. 87 398. 63 399. 75 399. 36 399. 31 399. 67 * Frequency in MHz, environmental condition not factored.

Discussion and Plan • Next week – second cavity weld before the first cavity weld rework. • Heat treatment considering 800 deg C 3 hours to save time – need to consider copper brazing and knife edge.