“Putting the Physics of Beams at the Forefront of Science”
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“Putting the Physics of Beams at the Forefront of Science”. 50+ PRL 5 Nature Science Physics Today. 25 PhDs. UCLA and USC AARD PROGRAMS. C.Joshi, W.Mori, C.Clayton(UCLA), T.Katsouleas, P.Muggli(USC). GRAND CHALLENGE in AARD.

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Ucla and usc aard programs

“Putting the Physics of Beams at the Forefront of Science”

50+ PRL

5 Nature

Science

Physics Today

25 PhDs

UCLA

and

USC AARD PROGRAMS

C.Joshi, W.Mori, C.Clayton(UCLA), T.Katsouleas, P.Muggli(USC)


Ucla and usc aard programs

GRAND CHALLENGE in AARD

PLASMA AFTERBURNER

  • Double the energy of Collider w/ short plasma sections before IP

  • 1st half of beam excites wake --decelerates to 0

  • 2nd half of beams rides wake--accelerates to 2 x Eo

  • Make up for Luminosity decrease N2/z2 by halving  in a final plasma lens

LENSES

50 GeV e-

50 GeV e+

e+WFA

e-WFA

O

O

IP

5m

S. Lee et al., PRST-AB (2001)


Betatron radiation positron source

Collimators

Plasma

Bending Magnet

Target

e-

x

8mm

z

e- Extraction

10 cm

40 m

Betatron Radiation Positron Source

  • One meter long plasma of density

    1e17 could produce 20 positrons/e

    The energy spectrum is in the

    5-30 MeV range.

    Possibility of generating polarized

    positrons?

D.Johnson et.al.To be submitted to PRL


Ucla and usc aard programs

Electron Cloud Formation

  • Clouds form in positron rings via synchrotron radiation

  • Clouds form in proton rings via halo or residual gas ionization

  • Cloud build-up due to acceleration in beam potential and secondary emission

  • Predicted Electron cloud density is 105 - 107 cm-3

  • A head-tail type instability results in beam blow up


Advanced computational modeling program

AARD Needs

Advanced Computational Modeling Program

  • Strong University-Based Research Program

  • Beam Research Facilities :SABER

All AARD Schemes will eventually need access to a 10 GeV class electron/positron beam line.


Ucla and usc aard programs

OUR VISION

  • To address critical issues for realizing the promise of a plasma-based accelerator at the energy frontier in the next decade.

  • To Design a Hi-fidelity virtual accelerator at full scale and end-to-end.


Ucla and usc aard programs

PLASMA WAKEFIELD ACCELERATORBlowout regime

flattens wake, reduces energy spread

Beam load

Ez

Unloaded wake

E157,162,164(X),167

  • Loaded wake

  • Nload~30% Nmax

  • 1% energy spread


Massively parallel computations in aid of plasma acceleration research

afterburner

hosing

E164X

.

MASSIVELY PARALLEL COMPUTATIONS IN AID OF PLASMA ACCELERATION RESEARCH

OSIRIS: (Full PIC)

  • Moving window, parallel

  • Dynamic load balancing

  • Field and Impact Ionization

  • Successfully applied to full 3D modeling of LWFA and PWFA experiments

  • QuickPIC:

  • Highly efficient quasi-static model for beam-

  • driven plasma accelerators

  • Fully parallel with dynamic load balancing

  • Ponderomotive guiding center + envelope

  • models for laser driven

  • ADK model for field ionization

  • At least100x faster than full PIC


Ucla and usc aard programs

N=1x1010 electrons

N=3x1010 electrons

500 GeV Energy Gain in 20 meters!

Accelerating field

24GeV/m at the load


Ucla and usc aard programs

E164X August Run

12GeV Energy Gain in less than 30cm !


Latest results from e164x

Latest Results from E164X

  • First attempt at crafting two distinct bunches

  • First bunch drives the wake while the second gains

  • energy.

  • Positrons created from betatron X-rays and positron

    spectra measured.

  • Multi GeV trapped particles observed whenever the

    gradient exceeded 40 GeV/m.


Ucla and usc aard programs

Self Trapping of Plasma Electrons

Clear threshold

  • Trapping above a threshold accelerating field of 40 GeV/m

  • Dark current ~ beam current (loads the wake)

  • Trapped particle energy scales with plasma length: 5GeV @ 30cm


What s next e167

What’s Next?:E167

3D OSIRIS SIMULATIONS

Energy Gain (GeV)

Plasma Length(cm)

Energy Doubling of the SLAC 28.5 GeV Beam in 60 cm Possible

If successful E167 will try doubling the 50 GeV Beam


Ucla and usc aard programs

Plasma Accelerator Progress

“Accelerator Moore’s Law”

ILC

E167 O

Current Energy Frontier

E164X

RAL

LBL Osaka

UCLA

ANL


Critical r d path to plasma afterburner

CRITICAL R&D PATH TO PLASMA AFTERBURNER

  • High Gradient Electron and Positron Acceleration

  • Transverse Beam Quality (emittance preservation)

    • jitter and pointing,head erosion

    • hose instability,ion motion,scattering

  • “Crafting” Two Bunches

  • Nanometer Focusing,Asymmetric Beams

    All these issues can be addressed with SABER

  • One-to-One PIC Simulations Capability of a Virtual

    Plasma Afterburner


Short e pulses from saber will give gradients of 5 gev m

5.7GeV in 39cm

Short e+ pulses from SABER will give gradients of 5 GeV/m

N=1.5e10

Spot Size=10 micron

Bunch length=100fs

Simulations:M.Zhou UCLA


Plasma focusing to nanometer spot sizes

Plasma Focusing to Nanometer Spot Sizes

FFTB experiments have shown focusing

Strengths of giga-Gauss/cm

M.Hogan et.al. PRL 03

J.Ng et al. PRL

E162: Positron Focusing

Can we focus e+,e- SABER beams to submicron dimension using plasma lenses?

Can we design layered structures as lenses for obtaining nanometer spot sizes?


Ph d students trained in past five years

PH.D STUDENTS TRAINED IN PAST FIVE YEARS

Advisor:

  • Brian Duda, 2000 Mori

  • Shuoqin Wang, 2002 Joshi

  • Brent Blue, 2003 Joshi

  • Catalin Filip, 2003 Joshi

  • Ritesh Narang, 2003 Joshi

  • Chengkun Huang, 2005Mori

Suzhi DengAli Ghalam

Jerry HoffmanSeung Lee

Peter LaiChiou

Over 25 Ph.Ds granted since group’s inception.

Faculty placed at USC, UCLA, U. Michigan/Nebraska,

Florida A&M, CalState, U. Osaka

5 Student Awards including two Best Ph.D. Thesis Awards


Statistical data

Statistical Data

  • Funding:DOE-HEP @ $1 million/yr average since 1987

    SciDAC ~ $170 K /year Theory and Simulations

    NSF ~ $150 K/year

  • Facilities:Neptune @ UCLA, 1998 - present

    FFTB @ SLAC, 1999 - present

    SABER @ SLAC, as soon as it is built

  • Users at Neptune: Joshi, Rosenzweig, Pellegrini, Muggli,

    Katsouleas

  • Annual Funding:

    • DoE HEP$490k

    • NSF (ORION)$50k

    • DoESciDAC$40k


Conclusions

CONCLUSIONS

  • Exciting time for AARD

  • DOE’s investment in AARD is beginning to pay off.

  • The AARD community is putting the Physics of Beams at the

  • forefront of Physics and science.

  • Continuing access to a high energy electron and positron beams

  • is a must for the health of the field.

  • (Need SABER at SLAC)

  • Plasmas are leading to

    well behaved optical elements of incredible

  • power for incorporation into future HEP machines.

  • table-top GeV class accelerators for applications

  • other than HEP.

Acknowledgements:E157,162,164,164Xand167 collaborators

DOE HEP,NSF,SCIDAC,USC,UCLA


Conclusions1

Conclusions

  • AARD program is doing an excellent job in training students.

  • Retention would be significantly improved if the National Labs

  • were more aggressive in assisting with Permanant Residence (

  • Green Card)in the US.

  • Industry is very successful with this strategy.


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