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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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slide1
“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)

slide2
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

slide4
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.

slide6
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.
slide7
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
slide9
N=1x1010 electrons

N=3x1010 electrons

500 GeV Energy Gain in 20 meters!

Accelerating field

24GeV/m at the load

slide10
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.

slide12
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

slide14
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, 2005 Mori

Suzhi Deng Ali Ghalam

Jerry Hoffman Seung Lee

Peter Lai Chiou

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
    • DoE SciDAC $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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