PostLS 2 commissioning SPS V Kain K Cornelis

Post-LS 2 commissioning - SPS V. Kain, K. Cornelis 1

Start-up after LS 1 (1) q New transformers for main power supplies, new 18 k. V cables q New function generators for all power converters in ring and transfer lines and for RF and transverse dampers – New interlocking for the transfer line power converters q q New RF power control, new damper controls New timing system – New COAST, economy – New requirements to start and stop main power supplies q LSS 1 + TT 10 completely de-installed and re-installed 2

Start-up after LS 1 (2) q Started dry running the SPS in March 2014 – Timing system available from March – First version of FGC – Cycle generation, settings, first application check-out q q Aux circuits from June From beginning of July: SPS closed for main circuit tests – Dry runs in parallel, polarity checks q q In schedule: 2 ½ weeks SPS check-out In schedule: 3 ½ weeks SPS set-up with beam 3

Start-up after LS 1 (3) q NA physics start-up 6 th of October 2014. q Check-out and set up were shortened however, due to issues with SPS beam dump and injection kickers 4

Issues q FESA 3 and FESA class ready too late – Cannot be ready at the last moment: OP still needs to make applications on top – Interface must be defined early § Small modifications are possible afterwards. q BI readiness with beam Lesson for Post LS 2: Require: All new FESA classes to be ready (interfaces available) end of January 2020. Also required from end January 2019: controls infrastructure (LSA, …) with timing. (Upgrades still possible until check-out, but to be coordinated) 5

PROPOSAL FOR POST-LS 2 Post-LS 2 Commissioning SPS 6

Machine Preparation after LS 2 q Similar strategy as post LS 1 q Machine Preparation tests will start 6 months before beam – Will organize availability of control system, timing, cycle generation – First test of new equipment interfaces – Aux circuits testing from CCC as soon as possible: e. g. FGC in simulation q Close machine 2 months before machine check-out. Access only upon request. – – – Main circuit testing New RF etc. To be discussed with equipment teams: 2 months sufficient? Polarity checks Kicker conditioning…. Interlock tests 7

From the current planning 8

Beam commissioning – beam requirements Double optics beam based alignment: q FT beam q 25 ns beam, 12 bunches OR indiv Preparation for LHC: q Pilot 9

Beam commissioning plan q Inject and establish circulating FT-beam (2 h-3 d) – New orbit system will be auto-triggered q q Capture the beam (all low level control will be new) (1 d-2 d) Time in orbit monitors (1 d) – For first turn q Align cavities (2 d) – More cavities than before LS 2 q q Accelerate to 400 Ge. V (2 d) LSS 5 beam dump commissioning part 1 (1 d) Time assignment and detailed tests to be finalized.

Beam commissioning plan q q q Inject, capture and accelerate 25 nsec beam 12 bunches (5 d) Minimise bad BPMs, kick response(2 d) Beam based alignment with double optics (2 d) Commission LSS 5 beam dump part 2 (1 d) Commission damper for FT (1 d) Setting up slow extraction to TED (1 d-4 d) RF feed back’s for 25 nsec beam. (1 d-5 d) Transverse damper 25 nsec (1 d) LHC pilot cycle Setting up LHC extraction and commission transfer lines - pilot (1 d) Aperture measurements with FT beam during night shifts Time requirement: 6 – 8 weeks (driven by RF) Result @ end of this period: machine ready for low intensity LHC beams (up to 12 bunches)

Summary - SPS q New FESA classes (at least interface) or FGC available end of January 2020 q Start dry runs: ~ 6 months before check-out q Close machine: 3 months before beam; – Hardware tests; RF commissioning q 1 month of check-out q 6 -8 weeks of beam commissioning q Test plan: https: //opwebtools. web. cern. ch/machine_checkout/frontend/index. html#/tests/ machines/sps/areas/89 12