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TLEP and Relevant Accelerator Expertise UK

TLEP and Relevant Accelerator Expertise UK. t he same tunnel could host an e + e - Higgs factory “TLEP” and a highest-luminosity highest-energy e-p /A collider. TLEP scenario. 1. 2012: LHC discovers Higgs at 126 GeV Potential for a circular collider “TLEP” in a new

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TLEP and Relevant Accelerator Expertise UK

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  1. TLEP and Relevant Accelerator Expertise UK the same tunnel could host an e+e- Higgs factory “TLEP” and a highest-luminosity highest-energy e-p/A collider

  2. TLEP scenario 1. 2012: LHC discovers Higgs at 126 GeV Potential for a circular collider “TLEP” in a new 80-100km tunnel: 300X LEP 2 luminosity in 4 IPs (precision Higgs studies) High luminosity made possible by: smaller “low beta”, smaller emittance and top-up injection 4. Potentially very high luminosity at Z pole and WW threshold plus polarisation and operation up to tt- threshold

  3. TLEP : circular e+e-collider to study the Higgs boson short beam lifetime (~tLEP2/40) due to high luminosity supported by top-up injection (used at KEKB, PEP-II, SLS,…)

  4. TLEP beam lifetime: two limits RadiativeBhabhascattering (s≈0.215 barn) LEP2: tbeam,LEP2~ 6 h TLEP with L~5x1034 cm−2s−1 at 4 IPs: tbeam,TLEP~21 minutes, unavoidable 2. Beamstrahlung(synchr. rad. during the collision) mitigated by: (1) large momentum acceptance h (2) flat beams [i.e. small ey & large bx*] (3) fast replenishing

  5. Top-up injection: schematic cycle beam current in collider (15 min. beam lifetime) 100% 99% almost constant current energy of accelerator ring 120 GeV injection into collider injection into accelerator 20 GeV acceleration time = 1.6 s (assuming SPS ramp rate) 10 s

  6. other TLEP challenges BNL 5-cell 700 MHz cavity • efficient RF system • need 12 GeV/turn at 350 GeV • ~600 m of SC RF cavities @ 20 MV/m • LEP2 had 600 m at 7 MV/m • very high power : up to 200 kW / cavity in collider ring • power couplers similar to ESS – 700-800 MHz preferred • operation at Z pole • 7500 bunches : e+ source, impedance effects, parasitic collisions • two separate rings for e+ and e- beams will help here too RF Coupler (ESS/SPL)

  7. polarization R. Assmann LEP loss of polarization due to growing energy spread LEP observations + model predictions polarization scaling (energy spread!): LEP at 61 GeV → TLEP at 81 GeV TLEP optimized scenario TLEP U Wienands, April 2013  100 keVbeamenergy calibration byresonantdepolarization (using pilot bunches) aroundZpeak and W pair threshold: mZ~0.1 MeV, Z ~0.1 MeV, mW ~ 0.5 MeV r = 9000 m, C = 80 km lower energy spread, high polarization up to W threshold A. Blondel

  8. TLEP energy upgrade

  9. luminosity - past&plannede+e- colliders TLEP-Z S. Henderson TLEP-W TLEP-H TLEP-t the circular route

  10. e+e- Higgs factories: luminosity ultimate precision at Z, WW, ZH ; sensitive to New Physics in multi-TeVrange & to SM closure → case for VHE-LHC ultimate energy reach up to 1 or 3 TeV ; direct searches for New Physics

  11. UK Expressions of Interest Leonidopoulos Christos, University of Edinburgh ; Glover Nigel, Durham University ; Burt Graeme, Cockcroft Institute (Lancaster); Owen Hywel, Cockcroft Institute (Manchester); Krauss Frank, Durham University ; Wolski Andrzej, Cockcroft Institute (Liverpool); Boehm Celine, Durham University ; Campanelli Mario, University College London ; Ellis John, King's College London ; KhozeValeri, Durham University ; Sanz Veronica, University of Sussex ; Chattopadhyay Swapan, Cockcroft Institute ; Moretti Stefano, University of Southampton ; Oh Alexander, University of Manchester ; Appleby Robert, Cockcroft Institute (Manchester); Lenz Alexander, Durham University ; Kar Deepak, University of Glasgow Susan Smith, Cockcroft Institute (STFC/ASTeC)

  12. UK Accelerator Expertise General High Energy Collider Designs (e.g. LHC, HL-LHC, ILC, CLIC, Super-B,…) 2. Accelerator Lattice and Optics Optimization 3. Linear and Nonlinear Beam and Collision Dynamics 4. Low and High Power Radio Frequency Design and Systems 5. Machine-Detector Interface 6. Collimation 7. Polarization

  13. TLEP UK capacity at present There is comprehensive expertise in UK in all aspects of high energy lepton and hadron colliders; This expertise resides in UK at many places: Cockcroft Institute, John Adams Institute, STFC/ASTeC, Imperial College, UCL, Rutherford and Daresbury Labs, etc; About half a dozen well known international accelerator experts from the Cockcroft Institute, UK have shown interest in TLEP and are keeping abreast of the developments. Potentially, there could be many more that could be registered; Despite this existing “capability”, the UK “capacity” to contribute to TLEP developments directly is very limited due to significant involvement of UK accelerator scientists in other accelerator developments at CERN (e.g. Hi-Lumi LHC, CLIC, proton-driven plasma acceleration experiment AWAKE, anti-proton facility developments, accelerators for medicine, etc.) as well as off-shore activities such as COMET and g-2 experiments etc. The accelerator experts in UK will support the initiatives taken by the UK particle physicists as prioritised by the community and as financially enabled by the funding bodies such as the UK research councils(STFC) and by CERN directly.

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