Update on Drive Beam BPM Development
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Transcript of Update on Drive Beam BPM Development
Update on Drive Beam BPM
DevelopmentAlfonso Benot Morell, CERN BE-BI
CLIC Module Working Group Meeting, 24 April 2013
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
CLIC Module Working Group Meeting, 24 April 2013
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
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
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
Contents
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)
2-50Ω-Terminated Stripline BPM Prototype
CLIC Module Working Group, 24 April 2013
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
CLIC Module Working Group Meeting, 24 April 2013
CLIC Module Working Group, 24 April 2013
2.1 – Initial Design
Parameter name Valuel_conus [mm] 2l_elec [mm] 36.3l_gap [mm] 5l_pin [mm] 8l_pipe [mm] 10l_sic [mm] 2.75
phi2 [°] 10r_blend [mm] 0.4r_conus [mm] 2.5r_elec [mm] 12.5r_out [mm] 13.54r_pin [mm] 0.73r_pipe [mm] 11.5
r_sphere [mm] 0.6
CLIC Module Working Group, 24 April 2013
2.1 – Initial Design
CLIC Module Working Group, 24 April 2013
2.1 – Initial Design
CLIC Module Working Group, 24 April 2013
2.1 – Initial Design 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. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wide gap2.4 Alternatives
3. Conclusions
Contents
CLIC Module Working Group Meeting, 24 April 2013
Parameter name Valuel_conus [mm] 2l_elec [mm] 36.3l_gap [mm] 5l_pin [mm] 8l_pipe [mm] 10l_sic [mm] 2.75
phi2 [°] 10r_blend [mm] 0.4r_conus [mm] 2.5
r_elec [mm] 13.4r_out [mm] 14.6
r_pin [mm] 0.73r_pipe [mm] 11.5
r_sphere [mm] 0.6
CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes
CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes1.9 mm thickness
CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes1.5 mm thickness
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
CLIC Module Working Group Meeting, 24 April 2013
1.5mm thick electrodes + 7mm gap
CLIC Module Working Group, 24 April 2013
2.3 – Wide Gap
Parameter name Value
l_conus [mm] 2
l_elec [mm] 10
l_gap [mm] 7l_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] 14.1r_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
2.3 – Wide Gap
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
CLIC Module Working Group Meeting, 24 April 2013
Latest proposal
CLIC Module Working Group, 24 April 2013
2.4 – Alternatives
Parameter name Value
l_conus [mm] 2
l_elec [mm] 10
l_gap [mm] 5.8l_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] 14.2r_pin [mm] 0.76
r_pipe [mm] 11.5
Latest proposal
CLIC Module Working Group, 24 April 2013
2.4 – Alternatives
Change electrode shape• Circular end rectangular (blended edges)• Tapering
External 12 GHz filtering
CLIC Module Working Group, 24 April 2013
2.4 – Alternatives
1. Status2. 50Ω Terminated Stripline BPM
2.1 Initial Design2.2 Thick Electrodes2.3 Wider gap2.4 Alternatives
3. Conclusions
Contents
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
3 - Conclusions
Thank you
CLIC Module Working Group, 24 April 2013