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General using symmetries in CST (Andrea), presented at the last impedance meeting .

Impedance working group update 3rd Sept 2013. General using symmetries in CST (Andrea), presented at the last impedance meeting . Transverse impedance of finite length devices with mode matching (Nicolo), and recall of Zotter / Gluckstern (Elias) presented at the last impedance meeting

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General using symmetries in CST (Andrea), presented at the last impedance meeting .

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  1. Impedance working group update 3rd Sept 2013 • General • using symmetries in CST (Andrea), presented at the last impedance meeting. • Transverse impedance of finite length devices with mode matching (Nicolo), and recall of Zotter/Gluckstern (Elias) presented at the last impedance meeting • CST specialized training coming up. • HL-LHC • Deadline: Beam induced heating with HL-LHC parameters for end of Summer • Deadline: impedance model for November

  2. LHC • ALFA: request to increase the gap between the bellow and the filler from 1 mm to 2 mm. • ALFA recommendation out for comments (Olav) • Non-conformities in RF contacts (presented at the last impedance meeting, LBOC next week): impedance of damage seems to be small and damage has not evolved from 2009 in the trplets no strong push to repair if isolated as difficult operation. • TDI: trying to increase copper coating thickness, but possibility of peeling in case of beam impact. • SPS • Wirescanner: MSWG last week most likely the insert tube will be removed. • ZS: discussion with Bruno Balhan, the ZS in LSS2 will not be changed, maybe ZSTF in LSS6, but not much time left. • TPSN, TPSG  very similar geometry to dummy septum without screen  likely many modes at low frequency. Serena agreed to study this. • PS • Deadline: Simone’s correction for TDR are being implemented. • Maybe new BGI in PS (Mariusz Sapinski): will contact us. • PSB • No news. • CLIC • No news • ELENA: • No news • TLEP: • No news

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