VERTEX ATLAS power converter upgrade 2 During LS

VERTEX / ATLAS power converter upgrade 2 During LS 2, 60 R 2 E-LHC 4 -6 -8 k. A-08 V converters replace initial Kempower LHCk. A ones. If rack converter frames + DCCT + FGC Elec. equipped chassis (FGC 2 replaced by FGC 3) stay in LHC, many modules will be available and free to be used. We Will use this modules to create new power converters Kempower, to be able to exchange three power converters S 21 type, in use for Vertex 1, Vertex 2 and Atlas morpugo spectrometer. te-epc 30/11/2020 : Recovery of LHC modules

VERTEX / ATLAS power converter upgrade PLAN 11627 External ressources te-epc 30/11/2020 3 Communication: Everything was prepare for the communication of the power converter. The Gateway will be install in the centre of the 887 building EN-EL: All the DIC was made and taking into account by EN-EL AC and DC cables Installation EHN 1: from 18/05/20 to 23/10/20 EN-CV: Cooling of the power converter: Everything is OK and the work will be done in August / September 2020. TE-MPE: It is important to consolidate the discharge resistor systems together with the power converter consolidation. Reusing the old discharge resistors in LS 2 and installing new resistors in LS 3 would cause additional costs for cabling in the order of 200 -300 k. CHF. It is strongly advised to consolidate the discharge resistors (included switch) during LS 2.

VERTEX / ATLAS power converter upgrade 4 The Three power converters will be ready before Summer 2020. Everything (power part, new FGC 3 electronic control) will be tested before installation in the Stand test building 287. VERTEX IMPLANTATION te-epc 30/11/2020 ATLAS IMPLANTATION At the end of the Heat Run, the maximal temperature on the Thyristor Bridges was 32 degrees