Staging in the TDR.

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Presentation transcript:

Staging in the TDR

Known () Physics ~125 GeV ‘that new boson’ 173 GeV Top quark 125+91=216 GeV cm  250 GeV 173 GeV Top quark 2x173=346 GeV cm  350-400 GeV Higgs self coupling (t-coupling) ??? ≥ 500 CM (up to 650 ??) TeV and beyond….? Staging / Upgrading

250 GeV CM (as first stage) Relative to TDR 500 GeV baseline (1312 bunches) Two stage compressor (5-15 GeV) POSITRON linac straightforward ~50% ML linac cost (cryomodules, klystrons, cryo etc.) ~50% ML AC power Half linacs solution G = 31.5 MV/m ELECTRON linac needs 10Hz mode for e+ production DE = 135 GeV instead of 110 GeV (+25 GeV) ~57% ML linac cost (cryomodules, klystrons etc) 10Hz needs (1/2 linac × 10Hz/5Hz): 100% ML AC power (1/2 linac × 10Hz/5Hz) 80% cryo cost (50% static + 100% dynamic) Total Main Linac infrastructure Linac components: 50% Cryogenics: 65% RF AC power 75%

Civil Engineering (Tunnel) Build tunnel/shafts only for 250 GeV Cheapest option! Energy extension now requires major civil construction (+cost) conceptually the same as for TeV upgrade option Shorten schedule ~2 years (guess) Build full 500 GeV machine tunnel Assume install low energy linac first long 125/150 GeV transport line in ‘empty tunnel. Energy upgrade now just adds accelerator to tunnel Options for ‘adiabatic’ upgrading Implications for mass production scenarios (long term investment may now look attractive) Additional upfront costs. May need to sell/cost entire project upfront More expensive but over a longer time scale. Shorten schedule <2 years since all tunnels need to be constructed. ~70% TDR $ ~77% TDR $

Details! for discussion May consider more conservatism for ‘energy overhead’ known physics targets! (Integrated) luminosity requirement for LHF Positron polarisation for LHF? 10Hz and 25GeV additional e- linac unattractive Should certainly focus on this operational area