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Update on Drive Beam BPM Development

This update covers the status and progress of the 50Ω terminated stripline BPM prototype development discussed at the CLIC Module Working Group Meeting held in April 2013. Topics include the initial design, thick electrodes, wider gaps, and alternative solutions. The meeting highlighted issues with manufacturing, electrode-feedthrough transitions, and the need for improved filtering. Conclusions emphasized the sensitivity of frequency response parameters and the necessity for further simulations.

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Update on Drive Beam BPM Development

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  1. Updateon Drive Beam BPM Development Alfonso BenotMorell, CERN BE-BI CLIC Module Working Group Meeting, 24 April 2013

  2. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  3. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  4. 1- Status • Stripline BPM prototypeterminated in short-circuit (withSiCdamper) installed in TBL (CLEX) • In theproximity of thelast PETS • Influence of ~130 MW 12 GHz RF non-local signal? • Low-Frequencyoperatingreadoutelectronics (<50 MHz) • Mayneedexternal 12 GHz notch-filteringsolutions • A 50Ω-terminatedstripline BPM prototype has beendesigned (withSiCdamper) • Initialdesignimproves 12 GHz filteringeffect • SiCdampensHOMsbutalso HF components • Manufacturabilityissues • Electrode-Feedthroughtransition • SiC Ring Thickness CLIC Module Working Group, 24 April 2013

  5. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives CLIC Module Working Group Meeting, 24 April 2013

  6. 2-50Ω-TerminatedStripline BPM Prototype • Intended use of 3rd null in frequency response as 12 GHz notchfilter (>40 dB fallneeded) • L_elec = 37.5 mm (nominal) CLIC Module Working Group, 24 April 2013

  7. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  8. 2.1 – InitialDesign CLIC Module Working Group, 24 April 2013

  9. 2.1 – InitialDesign CLIC Module Working Group, 24 April 2013

  10. 2.1 – InitialDesign CLIC Module Working Group, 24 April 2013

  11. 2.1 – InitialDesign • Manufacturabilityissues • AdditionalSiC ring +1.80mm  4.25mm total SiCthickness • TransitionElectrode-Feedthrough  Small spheresleftonbeamside of pipe  3rd lobedegraded CLIC Module Working Group, 24 April 2013

  12. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wide gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  13. 2.2 – Thickelectrodes CLIC Module Working Group, 24 April 2013

  14. 2.2 – Thickelectrodes 1.9 mm thickness CLIC Module Working Group, 24 April 2013

  15. 2.2 – Thickelectrodes 1.5 mm thickness CLIC Module Working Group, 24 April 2013

  16. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  17. 2.3 – Wide Gap • 1.5mm thickelectrodes + 7mm gap CLIC Module Working Group, 24 April 2013

  18. 2.3 – Wide Gap • 1.5mm thickelectrodes + 7mm gap CLIC Module Working Group, 24 April 2013

  19. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  20. 2.4 – Alternatives • Latestproposal CLIC Module Working Group, 24 April 2013

  21. 2.4 – Alternatives • Latestproposal CLIC Module Working Group, 24 April 2013

  22. 2.4 – Alternatives • Changeelectrodeshape • Circular end rectangular (blendededges) • Tapering • External 12 GHz filtering CLIC Module Working Group, 24 April 2013

  23. Contents • Status • 50ΩTerminatedStripline BPM 2.1 InitialDesign 2.2 ThickElectrodes 2.3 Wider gap 2.4 Alternatives • Conclusions CLIC Module Working Group Meeting, 24 April 2013

  24. 3 - Conclusions • Frequency response  ExtremelysensitivetoSiC • Parameterstovary: • L_gap • L_sic • L_elec ? • Searchformanufacturable (L_gap,L_sic) tohave >40 dB fallafter 3rd lobe (12 GHz) • Furthersimulationneeded CLIC Module Working Group, 24 April 2013

  25. Thankyou CLIC Module Working Group, 24 April 2013

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