A beam driven plasma wakefield linear collider pwfa lc from higgs factory to multi tev
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A Beam Driven Plasma-Wakefield Linear Collider: PWFA-LC From Higgs Factory to Multi- TeV PowerPoint PPT Presentation

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A Beam Driven Plasma-Wakefield Linear Collider: PWFA-LC From Higgs Factory to Multi- TeV. J.P Delahaye / SLAC On behalf of the E200 Collaboration

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A Beam Driven Plasma-Wakefield Linear Collider: PWFA-LC From Higgs Factory to Multi- TeV

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A Beam Driven Plasma-Wakefield Linear Collider:PWFA-LCFrom Higgs Factory to Multi-TeV

J.P Delahaye / SLAC

On behalf of the E200 Collaboration

E.Adli, M.J. Hogan, S. Corde, R.J. England, J. Frederico, S.J. Gessner, S. Li, M.D. Litos, T.Raubenheimer, Z. Wu, (SLAC, Stanford, USA),

C. Joshi, W. An, C.E. Clayton, K.A. Marsh, W. Mori, N. Vafaei-Najafabadi

(UCLA, Los Angeles, USA),

W. Lu (Tsinghua Univ. of Beijing, China and UCLA)

P. Muggli (MPI, Munich, Germany)

Thanks for slides from

M.Hogan, E.Adli, S.Gessner

Energy reach





main linac

beam delivery

Multi-TeV Linear Colliders challenges

  • Limitation by practicalities:

    • Wall plug power: mitigation power to beam transfer efficiency

      • Wall plug power <300MW @ 3TeV,

  • L0.01 = 2.1034 20 MW/beam

    • Cost : mitigation by high accelerating gradient

      • Total extension < 10km @ 3TeV

      • Each linac < 2.5 km

Wall plug to beam

efficiency > 13%

Effective Accelerating

Gradient ~ 1 GV/m

Linear Colliders (CLIC and ILC) at 500 GeVc.m.Power Cost

Gradient and efficiency in Linear Colliders

Beam-driven Plasma

Wake-Field Accelerator


Plasma Acceleration(Beam-driven or Laser-driven)

Laser pulse or

Witness bunch


Extremely strong focusing:


> MT/m

Drive bunch

Excellent power transfer efficiency:

hdrive to plasma ~ 76%,

hplasma to main ~ 66%

hdrive to main > 50%

FACET facility at SLAC

Simulation of 25GeV PWFA stage

E. Adli

@ IPAC'12

>10 GVm fields achieved in FACET at SLAC(First experimental run (April-June 2012)

  • 28 cm plasma cell with fractions of beam

  • decelerated (left) by up to 4 GeV.

  • accelerated (right) by up to 5 GeV,

  • corresponding to a gradient > 10 GV/m.

By varying the imaging energy of the imaging quads we can focus onto the different energy particles. This confirms that the tails observed are actually deceleration and acceleration :

Design of an optimumPlasma cell QuickPICsimulation(IDRE/UCLA)

hdriveto plasma ~ 76%,

hplasma to main ~ 66%

hdrive to main > 50%

Witness bunch evolution

(up to granularity of simulation)

Novel concept of a beam driven PWFA Linear Collider : A 2.5km HIGGS Factory (250m acceleration)

  • Beam parameters and luminosity similar to ILC but in a single bunch operation mode with flexible time interval

  • CW mode at high repetition frequency and large interval/bunches:

    • 12.5kHz repetition frequency (80ms)

  • One main bunch accelerated by one drive bunch per stage (25 GeV)

  • Drive beam accelerated to 25 GeV by 2*3.6 SC CW recirculating linac (a la CEBAF)

    • excellent efficiency (40%) and reasonable cryogenics (16MW)

  • Reduced dimensions due to high plasma acceleration gradients:

    • 7.6 GV/m with 13% filling factor thus effective accelerating field of 1 GV/m

  • Excellent efficiency

    • Beam acceleration: 20%

    • Overall wall-plug to beam: 9%@ 250GeV to 15%@ 3TeV

  • Upgradable over large energy range from HIGGS factory to 3 TeV

Lepton colliders main parameters HIGGS factory

PWFA main parameters


Drive beam , wall plug power and efficiency

Efficiency versus accelerating gradient

Wall plug

Pulsed mode

Drive linac


Similar bunch structure and beam parameters as the ILC

An alternative ILC upgrade by PWFAfrom 250GeV to 1 TeVand beyond?




One possible scenario could be:

1) Build & operate the ILC as presently proposed up to 250 GeV (125 GeV/beam): total extension 21km

Develop the PFWA technology in the meantime (up to 2025?)

When ILC upgrade requested by Physics (say up to 1 TeV), decide for ILC or PWFA technology:

4) Do not extend the ILC tunnel but remove latest 400m of ILC linac (beam energy reduced by 8 GeV)

5) Install a bunch length compressor and 16 plasma cells in latest part of each linac in the same tunnel for a 375+8 GeVPWFA beam acceleration (382m)

6) Reuse the return loop of the ILC main beam as return loop of the PWFA drive beam

ILC upgrade from 250 GeV to 1 TeV by PWFA

Issues and challenges to be addressed by specific R&D

  • Witness bunch acceleration by separate drive bunch

  • Beam loading scenarios with low momentum spread

  • Emittance preservation during acceleration

  • Drive to main beam power transfer efficiency

  • Multi-stage acceleration

  • Alignment tolerances and instabilities (hose, head erosion)

  • Positron acceleration

  • Plasma recovery between pulse and heat deposition

  • Multi-MW Super-conducting linac for drive beam generation and limitation by stored energy (specially in pulsed mode)

Challenges for Positron

Plasma Wakefield Acceleration

Positron Witness Bunch

Electron Drive Bunch

Positive Ion Background

Accelerating and Defocusing

Field for Positrons

Decelerating and Focusing

Field for Electrons










































PWFA a very promising technology:

Very high accelerating fields: effective 1 GV/m

Excellent power efficiency ( Wall-plug to beam 20%)

  • Great flexibility of time interval

    • CW or pulsed mode of operation

    • An alternative for ILC energy upgrade?

  • Many challenges still to be addressed;

    • Beam quality preservation, efficiency, positrons?

    • Ambitious test facilities: FACET and FACET2

    • Feasibility addressed early next decade?

  • Thanks to excellent and expert collaboration: E200

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