RF-Dipole Cavity Update December 02, 2016

Current Status – RFD-001 & RFD-002 Completed  Bulk BCP Bulk BCP – CTR-001 – Nov 18, 2016 Average removal – 122 microns Bulk BCP – EVHOM-001 – Nov 29, 2016 Average removal – 58 microns Low removal in the stub  Assembled for 2nd bulk BCP Bulk BCP – EHHOM-001 – Dec 01, 2016 Average removal – 95 microns To be Completed  Final welds CMM measurements for end plate lengths End plates – EVHOM-001, EVHOM-002, EHHOM-001 & EHHOM-001 Weld prep Electron beam welding Weld inspection CMM measurements to determine weld shrinkage Leak test Frequency measurement

Thickness Measurements – RFD-CTR-001 112 94 164 123 117 109 130 98 157 131 128 111 128 109 Average removal – 122 micron

Thickness Measurements – RFD-EVHOM-001 62 O20 O24 -5 7 O23 O22 O21 O25 71 89 13 146 80 Average removal – 67 micron  Reprocessing going on

Thickness Measurements – RFD-EHHOM-001 FPC Port HHOM Port O05 O06 O08 O09 O07 O12 O17 52 69 43 134 185 87 186 78 105 73 102 Average removal – 112 microns

Thickness Measurements – RFD-EHHOM-001 39 O04 O14 O13 O15 O16 163 183 256 O10 111 57

Port Losses and Q for Stainless Steel Flanges Beam Port – VHOM Side Calculations at 1.0 J with Stainless Steel flanges Conductivity of stainless steel 6.99×106 S/m Pick Up Port VHOM Port Port Power Loss [W] Q Beam Port (HHOM) 2.64×10-5 9.53×1013 Beam Port (VHOM) 2.71×10-4 9.30×1012 FPC Port 5.76×10-5 4.37×1013 HHOM Port 6.52×10-4 3.86×1012 VHOM Port 3.02×10-9 8.34×1017 Pick Up Port 1.69×10-18 1.49×1027 Total 1.01×10-3 2.50×1012 FPC Port HHOM Port Beam Port – HHOM Side

Coupling Factors for VTA Test Test Probes FPC and Pick Up ports are used for VTA rf test Probe calibration: Qext (FPC): ̴6.0 × 109 Qext (Pick Up): ̴5.0 × 1010 Use same probe for all the VTA tests Bare cavity test Bare cavity test with HOM couplers Cavity with He-vessel test Coupling Factors for VTA Test 105.5 mm 4.5 mm Parameter Value Geometrical Factor (G) 107 Ω Residual Resistance (Rres) 10 nΩ Rs at 2.0 K 11.3 nΩ Q0 at 2.0 K 9.5×109 Rs at 4.2 K 81.3 nΩ Q0 at 4.2 K 1.32×109 4.5 mm 53.25 mm 44.5 mm

Cavity Assembly Set Up Beam Port – VHOM Side Pick Up Port Blank flanges VHOM Port FPC Port Nb coated blank flange HHOM Port Beam Port – HHOM Side To vacuum pump