alfonso benot morell, cern be-bi clic module working group meeting, 24 april 2013
TRANSCRIPT
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Update on Drive Beam BPM
Development
Alfonso Benot Morell, CERN BE-BI
CLIC Module Working Group Meeting, 24 April 2013
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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
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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
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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
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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
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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
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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
![Page 8: Alfonso Benot Morell, CERN BE-BI CLIC Module Working Group Meeting, 24 April 2013](https://reader035.vdocuments.mx/reader035/viewer/2022062320/56649d005503460f949d1c7a/html5/thumbnails/8.jpg)
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
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CLIC Module Working Group, 24 April 2013
2.1 – Initial Design
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CLIC Module Working Group, 24 April 2013
2.1 – Initial Design
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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
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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
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Parameter name Value
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] 14.6r_pin [mm] 0.73
r_pipe [mm] 11.5
r_sphere [mm] 0.6
CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes
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CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes1.9 mm thickness
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CLIC Module Working Group, 24 April 2013
2.2 – Thick electrodes1.5 mm thickness
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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
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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] 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
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1.5mm thick electrodes + 7mm gap
CLIC Module Working Group, 24 April 2013
2.3 – Wide Gap
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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
![Page 20: Alfonso Benot Morell, CERN BE-BI CLIC Module Working Group Meeting, 24 April 2013](https://reader035.vdocuments.mx/reader035/viewer/2022062320/56649d005503460f949d1c7a/html5/thumbnails/20.jpg)
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] 5.8
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] 0.76r_pipe [mm] 11.5
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Latest proposal
CLIC Module Working Group, 24 April 2013
2.4 – Alternatives
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Change electrode shape• Circular end rectangular (blended edges)• Tapering
External 12 GHz filtering
CLIC Module Working Group, 24 April 2013
2.4 – Alternatives
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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
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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
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Thank you
CLIC Module Working Group, 24 April 2013