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

LHC SPS PS PSB CLIC ELENA: TLEP: 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: TLEP: