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One more look into ERL-ring LHeC Vladimir N. Litvinenko, Frank Zimmermann , Rogelio Tomas

One more look into ERL-ring LHeC Vladimir N. Litvinenko, Frank Zimmermann , Rogelio Tomas. Key ingredients: CW ERL low β * ~ 10 cm c rossing angle to avoid synchrotron radiation in the detector using low electron beam current and coherent electron cooling

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One more look into ERL-ring LHeC Vladimir N. Litvinenko, Frank Zimmermann , Rogelio Tomas

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  1. One more look into ERL-ring LHeCVladimir N. Litvinenko, Frank Zimmermann, Rogelio Tomas Key ingredients: • CW ERL • low β* ~ 10 cm • crossing angle to avoid synchrotron radiation in the detector • using low electron beam current and coherent electron cooling • power consumption < 100 MW • Luminosity > 1E34 cm-2sec-1

  2. Selecting key parameters

  3. Selecting key parametersfor 60 GeV ERL BNL type 700 MHz cavity He 2K refrigerator: ~700 W at RT per 1 Watt at 2K

  4. Selecting key parametersfor 60 GeV ERL

  5. 60 GeV ERL

  6. Coherent-electron-Cooling would provide following for linac-ring LHeC • Smaller proton beam emittance down to 0.2 mm mrad • Can provide shorted bunches down to 1 cm (if needed) • Allows to reduce electron beam current 20-fold to achieve of e-p luminosity above 1034 level with 60 GeV electrons and 7 TeV protons

  7. Layout for ERL based LHC 10 GeV linac • Energy of the ERL - 60 GeV • Polarized electron beam current - 8 mA • Number of passes – 3 • AC power consumption – 100 MW R=700m R=700m 10 GeV linac Dump Gun 0.5 GeV ERL-injector

  8. Sample of CeC for LHeC We are using here conservative 0.8 hrs cooling time

  9. V.N. Litvinenko, ABP Forum, CERN, April 9, 2010 Evolution of beam in LHC at 7 TeV with IBS and CeC (assuming nominal LHC bunch intensity 1.15e11 p/bunch and 40% of CeC cooling capability) J.LeDuff, "Single and Multiple Touschek effects", Proceedings of CERN Accelerator School, Rhodes, Greece, 20 September - 1 October, 1993, Editor: S.Turner, CERN 95-06, 22 November 1995, Vol. II, p. 573 IBS rates in LHC from Table 2.2 Stationary solution for τCeC= 0.8 hrs

  10. Details on power consumption

  11. Details of Coherent Electron Cooler for LHC

  12. Sample of CeC for LHeC

  13. Sample of CeC for LHeC

  14. Sample of CeC for LHeC

  15. Sample of CeC for LHeC

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