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Accelerator Group for LHeC

Accelerator Group for LHeC. Questions raised by Max.  does the e-ring fit into the tunnel? can one bypass ATLAS and CMS? which interaction region is available? where can we inject the e-beam? can one perform simultaneously e-p and p-p collisions?

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Accelerator Group for LHeC

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  1. Accelerator Group for LHeC Questions raised by Max  does the e-ring fit into the tunnel? • can one bypass ATLAS and CMS? • which interaction region is available? • where can we inject the e-beam? • can one perform simultaneously e-p and p-p collisions? • can one think about at linac-ring solution? Phase 2: -did not have enough time to look in detail into all the above questions  added more questions for work outline LHeC Meeting at CERN; October 2007 1

  2. Accelerator Group for LHeC Can the electron ring be build in the LHC tunnel?  how much synchrotron radiation can be accepted in the tunnel?  SC magnets; orbit corrector magnets and BI electronics!  this will determine the maximum e-beam energy and RF voltage for a ring-ring solution. • which interaction region is available?  definitely NOT IR3 and IR7 (radiation issues) and IR6 (beam dump area and damage potential for experiment) and IR1 and IR5 (ATLAS and CMS experiments)  probably not IR4 (very full [proton RF and beam instrumentation])  only IR2 (ALICE) and IR8 (LHCb) are (in my opinion) potential locations (do not know how ALICE and LHCb react to this!) LHeC meeting at CERN; October 2007 2

  3. Accelerator Group for LHeC Installation requirements:  space requirements for the RF (installed only in one IR)? • NC RF: limited to 30 GeV e-beam energy? (LEP1 / 4) • SC RF: requires additional cryogenics! • required space for the klystrons and wave guides • one needs to fix the e-beam energy to answer the above • space requirements for magnet power converter? • all underground alcoves are fully used by LHC equipment. • requires additional new underground alcoves! • space requirement for the electron triplet • might have to move backwards the p-triplet (*?) • electron beam emittances? (required e-beam *?) LHeC Meeting at CERN; October 2007 3

  4. Accelerator Group for LHeC where can one inject the electron beam?  old TI12 and TI18 lines near IR1 (ATLAS): • are the injection lines compatible with the experiments and insertion magnets of the LHC proton ring?  what happens incase of injection failures (proton beam protection)? • new transfer lines: • requires substantial new tunneling (a couple of km!) • probably similar tunneling work as for a ring-linac option! LHeC Meeting at CERN; October 2007 4

  5. Accelerator Group for LHeC can one perform simultaneously e-p and p-p collisions?  requires by-passing the other experiments: • additional tunneling and total tunnel length for e-beam • e-beam tunnel circumference must fit to the proton ring circumference!  store length of p-p (10h to 14h) and e-p (5h) and refilling schemes? LHeC Meeting at CERN; October 2007 5

  6. Accelerator Group for LHeC can one think about a ring-linac option?:  absolutely! • civil engineering probably comparable to ring-ring-option • luminosity reach comparable to ring-ring option (F. Zimmermann) • interesting intermediate electron linac installation (step to ILC/CLIC) • no need to by-pass other experiments and to worry about interference • no worries related to path length differences LHeC Meeting at CERN; October 2007 6

  7. Accelerator Group for LHeC future steps and help: (all names only suggestions for CERN contact): • installation in IR2 or IR8: experiments and TS-LEA & TS-IC • acceptable radiation dose for LHC dipole magnet: and specification of e-beam energy: AT MCS / MEL; A. Hoffmann? • space requirements for RF installation:AB-RF • space requirements for magnet power converter: AB-PO • potential injection line layout: Helmuth Burkhard • potential ring lattice and by-pass configurations and operation requirements (path length etc.): Albert Hoffmann; John Jowett • potential magnet design: AT MEL (Willi Kalbreier) • linac-ring option: F. Zimmermann; Turkey; Cockcroft laboratory LHeC Meeting at CERN; October 2007 7

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