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Possible Injection Scheme in the (80 km) TOE: Tunnel Of Everything

Possible Injection Scheme in the (80 km) TOE: Tunnel Of Everything. Lucio Rossi, Attilio Milanese and Davide Tommasini CERN Work of H. Piekarz (FNAL) widely used. HE-LHC c ost : rough evalution based on LHC.

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Possible Injection Scheme in the (80 km) TOE: Tunnel Of Everything

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  1. Possible Injection Scheme in the (80 km) TOE: Tunnel Of Everything Lucio Rossi, Attilio Milanese and Davide Tommasini CERN Work of H. Piekarz (FNAL) widelyused

  2. HE-LHC cost: rough evalutionbased on LHC • LHC (machine): about 3 BCHF (material, 2008), 1.7 BCHF for the magnet system, • HE-LHC: The non-magnet is  same 1.5 BCHF • Magnet System Nb3Sn (26 TeVc.o.m.) :  3.5 BCHF (for a total of 5 BCHF for the whole machine) • Magnet System HTS (33 TeVc.o.m) :  5 BCHF (for a total of 6.5 BCHF for the whole machine) • The abovecost are for a new machine, like LHC. Economycouldbe made becauseCryo and othersystemsneedonlyrenovation; • however one shouldconsidercost of LHC removal) LRossi@CLIC

  3. Other important issues, amongmany • Synchrotron radiation • 15 to 30 times! • The best is to use a windowgiven by vacuum stabilityataround 50-60 K (gain a factor 15 in cryopowerremoval!) • First study on beamimpedanceseems positive but to beverifiedcarefully • Use of HTS coatingat 50 K on beamscreento beexplored • Beam in & out • Both injection and beam dump region are constraints. • Ideally one wouldneedtwicestronger kickers • Beam dumps seemsfeasable by increasingrisetime from 3 to 5s • Injection wouldstronglybenefitfromstronger kickers otherwise a new lay-out isneeded (differentwith or wihtoutexperiments) LRossi@CLIC

  4. For HE-LHC :injection based on SPS+Possible use of Tevatron and HERA dipoles… HE-LHC SPS+ New injectorsoptimization Linac4 LRossi@CLIC

  5. Alternate scenarios for Injectors • Keeping SPS (and itstransferlines: 6 km!): LowEnergy Ring in LHC tunnel withsuperferricPipetronmagnets (W. Foster). • Workdone by Fermilab (H. Piekarz), see Malta workshop proc. • cost of LER is lower than SC-SPS option. • Integration is difficult but no show-stoppers LRossi@CLIC

  6. Specific issues of the VHE-LHC • BeamEnergy/Dipole Field optimizationmightbedifferent • Aperture canbelarger • Synchrotron radiation MUST beremovedat the highest possible temperature: Photon stopper? • A solution couldbe use of HTS coated on a beamscreenataround 100 K. The wallresistancewillbeverylow and the 2.5 MW/ring (about 30 W/m) canbecome 25(x2) MW of cryopower! • Kicker problemswillbestronglyreduced.

  7. Injection Scheme • The first baselinewas to use LHC • Eitherwith a SPS+ or wiht a LER in LHC • However if the LHC isused ONLY for injectoritis not worth • About 40 MW continuous power at plug for Cryoonly • Maintenance of a difficult 27 km tunnel and 7 km injection lines for 10% of use • Proposal: removeLHC and injectfrom SPS into a 80km-LER

  8. Injection scheme: SPS+ LHC  VHE-LHC is to expensive(50 MW power for cryo)

  9. Possible arrangement in VHE-LHC tunnel From H. Piekarz Malta Prooc. Pag. 101 30 mm V gap 50 mm H gap

  10. Possible VHE-LHC with a LER suitable for e+-e- collision (and VLHeC) Cheap likeresistivemagnets Central gap couldbeshortcircuited Or use of 4 beams to neutralize b-b LER canbendelectron 20-175 GeV proton 0.45-4 or 5 TeV/beam Limited power both for resisitive (e+e-) and for p-p (HTS) Sccablesdevelopedalready for SC links (HiLumi). SR by e- takenat 300 K

  11. A few numbers for proton injector 75 kA With I = 115-120 kA Bmax= 2 T

  12. A few numbers to use the samemagnet for e+ - e- I =3 kA The injection fieldislow, 74 Gauss (no diluition). Concern for fieldquaity. Wethinkispossîblewith «noble» Fe grain oriented but probablyalsowith normal Fe-Si. Alreadytested at100 Gauss. Nextmagnet (for RCS) willbetested to 50 Gauss. Diluitioncanalsobe a possibilty (not good for p-p injector)

  13. A Super-Resistivecable 20 mm thickshieldaroundcable Gaps: 2 x V30xH60 mm Cryostat : 60 mm He envelope : 50 mm SC part: 2 layers MgB2(Bi2212)150x1mm Cu innercore 40 mm Coolinghole: 10 mm Cable: innercore of 40 mm Cu (700 mm2) + outercore : 2 layers, 150 strands of MgB2, 1 kA each; Outer size 45 mm. 120 kA =>120 k€/km ! For electrons: us Cu water cooled, Jov 2.5 A/mm2 (easy): Pplug=11 MW/80km For protons: 800 A/strands 120 kA (for >2.1 T); the central copperis the stablizer Power: 0.1-W/m at Top = 10 K consumption/cableshouldbe possible: 10 kW of cold power: Pplug= few MW This is for eachchannel…

  14. Possible arrangement LER for e+e- 350 GeV 4 magnets, 8 channels 4 channel P = 44 MW (say 50) LER p-p injector 1 Magnet, 2 channels Top 10 K; Pcryostar < 10 MW If useful the second magnetispowered as return line TBS: 100 K ? ; P = 2x25 MW Photon stoppers are a must Use of 1 or 2 channels for e ring for a 150 GeV e- vs. 7-50 TeV p e- vs. Ions isalso possible

  15. Few preliminaryconsiderations • Probablydifferentoptimizationis possible for the channelsused as colliderat flat top and the onesused as synchrotrons for continuous injections • Relativelyfast cycle (Hz) seems possible • Very rough cost of the LER magnets (no cryo): <500 MCHF for 2 magnets (4 channels) • If the TLEP is to bepursuedbefore VHE-LHC and if thereis an interest for HE-LHC anyway in // one caninstall HE-LHC (27 TeV) meanwhileinstalling TLEP, and thenre-use the HE-LHC magnets and cryo-system for VHE-LHC (saving 1/3).

  16. In principle a plan for all is possible (for LHC exploitation): 2018-2020 iscritical time • According to Physicsneeds, the 80 km tunnel can: • Be alternative to HE-LHC • Or complementary to HE-LHC • Accomodatingatmoderate extra-cost TLEP and VLHeC • SkippingHE-LHC, TLEP/VLHeCmayshorten5-10years VHE-LHC

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