1. RF-Dipole Cavity Update
December 02, 2016

2. 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

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

4. Thickness Measurements – RFD-EVHOM-00162
O20
O24 -5 7
O23
O22
O21
O25 71 89 13
146 80
Average removal – 67 micron  Reprocessing going on

5. 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

6. Thickness Measurements – RFD-EHHOM-00139
O04
O14
O13
O15
O16
163
183
256
O10
111 57

7. 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

8. 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

9. 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