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118th Impedance Working Group Meeting (BGIs)
118th Impedance Working Group Meeting
OSAR Table
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Carlo reviewed the OSAR table prepared with Michela for the current CERN complex. As for the FCC-ee case, the table includes the device owner/contact, the person responsible for the impedance evaluation, and the current status.
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He also reviewed the devices that are scheduled for upcoming impedance measurements.
ECRs
Removal of the prototype EO BPM from the SPS during LS3
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The proposed modification is considered acceptable from an impedance perspective.
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However, the impedance geometry is not optimized. Similar non-optimized transitions should therefore be avoided where possible, and their proliferation should be limited, as their cumulative broadband and resonant contributions could become non-negligible.
In-situ carbon coating of the Inner Triplet at LHC Points 2 and 8
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Nicolas presented the findings and main conclusions.
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The impact on both longitudinal and transverse impedance is negligible.
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Overall, the impact of the full BST scope during LS3, covering the two ECRs mentioned above, is estimated to be <0.5% for the longitudinal impedance and <0.2% for the transverse impedance.
- Comments:
- Hermann asks how the impedance was computed , if it was IW2D and Nicolas confirms saying that it takes seconds to perform the computations
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