1 / 6

Impedance working group very brief status

Impedance working group very brief status. News. Impedance workshop many interesting follow-ups (e.g. TU Darmstadt codes, GdfidL issue with ferrite, ceramic inserts, diffraction limit) Detailed SPS longitudinal impedance model (presented at LIU-SPS)

warren
Télécharger la présentation

Impedance working group very brief status

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Impedance working group very brief status

  2. News • Impedance workshop • many interesting follow-ups (e.g. TU Darmstadt codes, GdfidL issue with ferrite, ceramic inserts, diffraction limit) • Detailed SPS longitudinal impedance model (presented at LIU-SPS) • Detailed PSB transverse impedance model (presented at LIU-PSB meeting) • Large impact of crab cavities on total HL-LHC transverse impedance predicted by DELPHI.

  3. Ongoing and planned measurements • BGV  done and presented • TOTEM  done and presented • Standard SPS tank for UA9 equipment (with the new CEA table)  done • UA9 goniometer  done • Vacuum instrumentation in SPS and LHC  done • TDI  ongoing this week • TCTP without ferrite  done and presented (with Andrea Mostacci) • SLAC collimator  done and presented • TCTP with ferrite  in July (with Andrea Mostacci) All the remaining items will be discussed at the next impedance meeting (postponed to accommodate for emergency TDI measurements).

  4. Pending requests • To Nicolas: potential new coating material for collimators (by Sergio Calatroni) • To Nicolas: impact of beam screen temperature on heating (by WP2) • To Elias: impact of new BPMs on triplet impedance (by WP2) • Help for design finalization of new LHCb VELO (by Massimiliano Ferro Luzzi, LHCb) • Status of ALICE beam pipe aperture change (new TREX working group) • Specifications for new RF fingers (TE-VSC) • Optimization of new collimator tapering (EN-MME) • Localization of power loss in the BGV chamber (BE-BI)

  5. Issues • TDI coating had to be abandoned due to incompatibility of NEG and hBN  Resistive wall heating will not reduce compared to before LS1 • Despite our request, TDI measurements were omitted in the planning  official request by ABP at LMC on 11th June  official recommendation by LMC on 11th June  TDI2 cannot be measured (already under bake out, very tight planning)  Huge effort by measurement team and collaborators to get ready when the TDI8 is available and limit impact on planning. Measurements started yesterday. Big thanks to all involved! • At the occasion of the ECR, check of LHC BSRT first mode and amplitude of the mode looked underestimated (due to wake windowing)  could lead to ~ 300 W with post LS1 parameters if resonance coincides with beam spectrum line  quick measurements with probe by BE-BI: mode not clear, to be followed up. • Factor 2 in tune shift obtained through DELPHI and Headtail?

  6. ECR approval • vacuum instrumentation in SPS and LHC : ok • New detector in SPS: was postponed since serious planning issue for both impedance and vacuum tests (not foreseen in planning). • BSRT: heating should reduce, and contribution to impedance model small : ok. • TCL6 and TOTEM: ok for installation, but warning that low gaps may limit LHC performance. • Many ECRs with no impact on impedance

More Related