Alfonso Benot Morell, CERN BE-BI CLIC Module Working Group Meeting, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

 Stripline BPM prototype terminated in short- circuit (with SiC damper) installed in TBL (CLEX) In the proximity of the last PETS Influence of ~130 MW 12 GHz RF non-local signal? Low-Frequency operating readout electronics (<50 MHz) May need external 12 GHz notch-filtering solutions  A 50Ω-terminated stripline BPM prototype has been designed (with SiC damper) Initial design improves 12 GHz filtering effect SiC dampens HOMs but also HF components Manufacturability issues Electrode-Feedthrough transition SiC Ring Thickness CLIC Module Working Group, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives CLIC Module Working Group Meeting, 24 April 2013

 Intended use of 3rd null in frequency response as 12 GHz notch filter (>40 dB fall needed)  L_elec = 37.5 mm (nominal) CLIC Module Working Group, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

CLIC Module Working Group, 24 April 2013 Parameter nameValue l_conus [mm]2 l_elec [mm]36.3 l_gap [mm]5 l_pin [mm]8 l_pipe [mm]10 l_sic [mm]2.75 phi2 [°]10 r_blend [mm]0.4 r_conus [mm]2.5 r_elec [mm]12.5 r_out [mm]13.54 r_pin [mm]0.73 r_pipe [mm]11.5 r_sphere [mm]0.6

CLIC Module Working Group, 24 April 2013

 Manufacturability issues ◦ Additional SiC ring +1.80mm  4.25mm total SiC thickness ◦ Transition Electrode-Feedthrough  Small spheres left on beam side of pipe  3rd lobe degraded

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wide gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

Parameter nameValue l_conus [mm]2 l_elec [mm]36.3 l_gap [mm]5 l_pin [mm]8 l_pipe [mm]10 l_sic [mm]2.75 phi2 [°]10 r_blend [mm]0.4 r_conus [mm]2.5 r_elec [mm]13.4 r_out [mm]14.6 r_pin [mm]0.73 r_pipe [mm]11.5 r_sphere [mm]0.6 CLIC Module Working Group, 24 April 2013

1.9 mm thickness

CLIC Module Working Group, 24 April mm thickness

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

 1.5mm thick electrodes + 7mm gap CLIC Module Working Group, 24 April 2013 Parameter nameValue l_conus [mm]2 l_elec [mm]10 l_gap [mm]7 l_pin [mm]8 l_pipe [mm]10 l_sic [mm]2.75 phi2 [°]10 r_blend [mm]0.4 r_conus [mm]2.5 r_elec [mm]13 r_out [mm]14.1 r_pin [mm]0.73 r_pipe [mm]11.5 r_sphere [mm]0.6

 1.5mm thick electrodes + 7mm gap CLIC Module Working Group, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

 Latest proposal CLIC Module Working Group, 24 April 2013 Parameter nameValue l_conus [mm]2 l_elec [mm]10 l_gap [mm]5.8 l_pin [mm]8 l_pipe [mm]10 l_sic [mm]2.75 phi2 [°]10 r_blend [mm]0.4 r_conus [mm]2.5 r_elec [mm]12.5 r_out [mm]13.54 r_out_sic [mm]14.2 r_pin [mm]0.76 r_pipe [mm]11.5

 Latest proposal CLIC Module Working Group, 24 April 2013

 Change electrode shape Circular end  rectangular (blended edges) Tapering  External 12 GHz filtering CLIC Module Working Group, 24 April 2013

1. Status 2. 50Ω Terminated Stripline BPM 2.1 Initial Design 2.2 Thick Electrodes 2.3 Wider gap 2.4 Alternatives 3. Conclusions CLIC Module Working Group Meeting, 24 April 2013

 Frequency response  Extremely sensitive to SiC  Parameters to vary: L_gap L_sic L_elec ?  Search for manufacturable (L_gap,L_sic) to have >40 dB fall after 3rd lobe (12 GHz)  Further simulation needed CLIC Module Working Group, 24 April 2013

Thank you CLIC Module Working Group, 24 April 2013