UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

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UCLA UCLA Advanced Accelerator Program (excluding PWFA@FFTB) J. Rosenzweig Representing: D. Cline, C. Joshi, W. Mori, C. Pellegrini HEPAP AARD Subpanel Palo Alto, December 21, 2005

description

UCLA Advanced Accelerator Program (excluding PWFA@FFTB). J. Rosenzweig Representing: D. Cline, C. Joshi, W. Mori, C. Pellegrini HEPAP AARD Subpanel Palo Alto, December 21, 2005. EXPERIMENTS. Dr. Chris Clayton. Dr. Sergei Tochitsky. Ken Marsh. Jay Sung,. Neptune Lab. Joe Ralph,. - PowerPoint PPT Presentation

Transcript of UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Page 1: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLA

UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

J. Rosenzweig

Representing: D. Cline, C. Joshi, W. Mori, C. Pellegrini

HEPAP AARD Subpanel

Palo Alto, December 21, 2005

J. Rosenzweig

Representing: D. Cline, C. Joshi, W. Mori, C. Pellegrini

HEPAP AARD Subpanel

Palo Alto, December 21, 2005

Page 2: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLA

UCLA Program on Plasma Based Accelerators

C. Joshi, P.I. W. Mori, Co-P.I.

C. Clayton, Co-P.I.

Administrative SupportMaria Guerrero, 50%

EXPERIMENTSDr. Chris ClaytonDr. Sergei TochitskyKen MarshJay Sung, Neptune LabJoe Ralph, Neptune LabDevon Johnson, SLACFang Fang, Neptune LabDavid Auerbach, SLAC

Collaborators:Professors J. Rosenzweig & C. PellegriniProfessor R. Siemann, Dr. M. Hogan (SLAC)Professors T. Katsouleas & P. Muggli (USC)Professor B. Dangor, Dr. Z. Najmudin (IC-UK)

THEORY & SIMULATIONSProfessor Warren MoriDr. Frank Tsung, (Postdoc, 10%)

Chengkun Huang, Neptune, SLAC, (Postdoc 10%)Wei Lu, Neptune, SLACMiaomiao Zhou, Neptune, SLAC

UCLA Plasma Accelerator Group

Students

Staff

Students

Joshi/Mori Group

Page 3: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLA

1. Source of new ideas and techniques for plasma based acceleration–Long Range

2. Vigorous in-house experimental program on advanced accelerator research–Long Range

3. Plasma wakefield scheme as an afterburner for linear collider–medium range

4. Massively parallel computations for advanced accelerator research–medium range

5. Train students and postdocs

Goals of the Plasma Accelerator (Joshi-Mori) Group @ UCLA

Page 4: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLAStatistical Data

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

SciDAC ~ $170 K /year Theory and Simulations

NSF ~ $150 K/year

2. Facilities: Neptune @ UCLA, 1998 - present

FFTB @ SLAC, 1999 - present

SABER @ SLAC, as soon as it is built

3. Users at Neptune: Joshi, Rosenzweig, Pellegrini, Muggli,

Katsouleas

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UCLA1. Source of New Ideas

• Plasma Beat Wave Accelerator (PBWA)• Plasma Wakefield Accelerator (PWFA)• Laser Wakefield Accelerator (LWFA)• Plasma and E.M. Wigglers for FELs• Tunable Radiation Generation Using

Ionizations Fronts• Plasma Lenses for Focusing particle

Beams• Cherenkov Radiation from Plasmas

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UCLA

In-house Experimental Program on Plasma Acceleration: Highlights

(I)

100

101

102

103

104

105

106

1 10

30% model25% model

Ele

ctro

ns/M

eV

Electron energy (MeV)303

InjectionEnergy

TrappingEnergy

First demonstration of acceleration at > 1 GeV/m in plasma

Energy gain exceeded the trapping energy

PBWAEverett et. al., Nature 368, 527 (1994)

2.

Plasma LensHairapetian et al., PRL 72, 2403 (1994)

Focusing of a 5 MeV electron beam by a factor of two using an overdense plasma lens

Time dependent focusing demonstrated

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UCLA

In-house Experimental Program on Plasma Acceleration: Highlights

(II)

aaa

a

aa

Raman Forward Scattering shown to be capable of accelerating electrons

nC of charge, self-trapped and accelerated in a gas jet experiment

Self Modulated LWFAModena et. al., Nature 377, 606 (1995)

Relativistic guiding of a 20 TW laser over 20 Rayleigh lengths shown

A relativistic plasma wave was shown to reside inside the self- guided channel

Relativistic GuidingClayton et. al., PRL 81, 100 (1998)

2.

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UCLA

In-house Experimental Program on

Plasma Acceleration: Highlights (III)

aaaa

1

100

104

106

10 15 20 25 30 35 40 45 50

Noise Level

12

MeV

In

ject

ed

Ele

ctro

ns

S

S

Energy, MeV

Ele

ctro

ns/M

eV

35A12A

Greater than 100 MeV energy gain in plasmas seen for the first time

Energy gain greater than linear dephasing limit

Breaking the 100 MeV barrierGordon et al., PRL 80, 2133 (1998)

Second generation Plasma Beat Wave Accelerator experiment in Neptune shows injected 12 MeV particles gaining energy out to 50 MeV

Second Generation PBWA Expts Tochitsky et al., PRL 92, 095004 (2004)

2.

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UCLA

UCLA Program at SLAC: UCLA/USC/SLAC Collaboration

1. 15 GeV acceleration in 30 cm plasma (Length Scaling of Energy Gain)

2. E164X breaks GeV barrier, Hogan et al., PRL 95, 054802 (2005)

3. Matched beam propagation leads to first acceleration, Muggli et al., PRL 93, 014802 (2004)

4. Positron acceleration by plasma, Blue et al., PRL 90, 214801 (2003)

5. Positron focusing of plasma column, Hogan et al., PRL 90, 205002 (2003)

6. Betatron x-ray emission using plasma, Wang et al., PRL 88, 135004 (2002)

7. Plasma as a thick focusing optic, Clayton et al., PRL 88, 154801 (2002)

8. Refraction of Electron Beam, Muggli et al., Nature 411, 43 (2001)

Talk by R. Siemann at this meeting

3.

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UCLA

MASSIVELY PARALLEL COMPUTATIONS IN AID OF PLASMA ACCELERATION RESEARCH

afterburner

hosing

E164X

OSIRIS: (Full PIC)

• Moving window, parallel

• Dynamic load balancing

• Field and Impact Ionization

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

• 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

4.

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UCLA

PH.D STUDENTS TRAINED IN PAST FIVE YEARS

• Brian Duda, 2000 Mori• Shuoqin Wang, 2002 Joshi• Brent Blue, 2003 Joshi• Catalin Filip, 2003 Joshi• Ritesh Narang, 2003 Joshi• Chengkun Huang, 2005 Mori

Advisor:

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

5.

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UCLA

Advanced Accelerator Physics at UCLA Physics & Astronomy:

Cline Group The Cline group was the first experimental

advanced accelerator group in the UCLA Physics Dept., formed initially at U. Wisconsin

Members of the group: D. Cline, A. Garren, Y. Fukui, K. Lee, F. Zhou, X. Yang, L. Shao (PhD Student) and undergraduate students at UCLA

Key collaborators: H. Kirk (BNL), M. Ross (SLAC) W. Kimura (STI), V. Yakimenko, I. Pogorelsky (BNL/ATF), Y. Ho and Q. Kang (Fudon University)

 Muon Collider Collaborators: ILC University Research Program, ATF/BNL Faculty

Goals of team:

(1) Training of PhD students and postdoctoral people

(2) The study and design of beam cooling and muon colliders/neutrino factories

(3) Development of beam monitors for the ILC

(4) Advanced accelerator concepts at the BNL ATF

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UCLA

Activities of the Cline Advanced Accelerator Team

 (1) Training of PhD Students This group has trained 15 PhD or MS students. Pre-history at Univ. Wisconsin included D. Larson, J. Rosenzweig, X. Wang; more recently P. He has joined BNL staff (2) Muon Collider/Neutrino Factory The modern development of the muon collider was started by this group in 1992 with a meeting in Napa, California. During the 1990s we held five key conferences and muon collider collaboration meetings. Current work:

- The fiber tracker for MICE cooling experiments     - The study of various ring coolers for muon colliders - The design of a special muon collider to study Higgs bosons that could be discovered at the LHC (A, H Higgs)

Page 14: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLARing Coolers and Muon Colliders/Higgs Factories

 David B. Cline

 Center for Advanced Accelerators, Department of Physics & Astronomy, University of California, Los Angeles, CA 90095 USA

  We describe the progress in the simulation of 6D cooling of beams for use in neutrino factories and muon beam colliders. We concentrate on the final cooling needed to reach the emmittance required for a SUSY Higgs factory using high-pressure gas ring coolers and Li lens ring coolers.

Figure 1. Recent concept for a +- collider Higgs factory.

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UCLADemonstration of High-Trapping Efficiency and Narrow Energy Spread

in a Laser-Driven Accelerator 

W.D. Kimura, et al., Physical Review Letters, 2003 Laser-driven electron accelerators (laser linacs) offer the potential for enabling much more economical and compact devices. However, the development of practical and efficient laser linacs requires accelerating a large ensemble of electons together (“trapping”) while keeping their energy spread small. This has never been realized before for any laser acceleration system. We present here the first demonstration of a high-trapping efficiency and narrow energy spread via laser acceleration. Trapping efficiencies of up to 80% and energy spreads down to 0.36% (1) were demonstrated.

Laser acceleration at BNL ATF

Staging, low energy spread demonstrated

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UCLA

Next generation advanced accelerator scheme: Vacuum laser acceleration

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UCLA

ODR (Optical Diffraction Radiation) Beam Size Detector at SLAC FFTB

Experiment in support of ILC diagnostic development  

Page 18: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Rosenzweig-Pellegrini Group:the Particle Beam Physics Lab

(PBPL)

Rosenzweig-Pellegrini Group:the Particle Beam Physics Lab

(PBPL)Group built upon three research thrusts

Strong connections between all areasCommon themes: multi-disciplinary, high energy density (relativistic) interactions, ultra-fast systems

Basic beam physics and technology underpins other two areas

Group built upon three research thrusts

Strong connections between all areasCommon themes: multi-disciplinary, high energy density (relativistic) interactions, ultra-fast systems

Basic beam physics and technology underpins other two areas

Advanced acceleratorsAdvanced

acceleratorsAdvanced

light sourcesAdvanced

light sources

High brightness electron beamsHigh brightness electron beams

Page 19: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Basic theoryBasic theory Simulation and advanced computing

Simulation and advanced computing

Cutting-edge experimentsCutting-edge experiments

Advanced technologyAdvanced technology

Aspects of Research Program

Aspects of Research Program

Scientific disciplines touched upon include:Beam-plasma interaction; beam material interaction

Collective beam effects, nonlinear beam dynamics

Beam-radiation interaction; instabilities Device physics: high power microwaves, lasers, THz

Ultra-fast measurements

Scientific disciplines touched upon include:Beam-plasma interaction; beam material interaction

Collective beam effects, nonlinear beam dynamics

Beam-radiation interaction; instabilities Device physics: high power microwaves, lasers, THz

Ultra-fast measurements

Education

Page 20: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Group statisticsGroup statisticsPopulation

Faculty: 2 (new hires coming)Profession researchers: 2Technical staff: 5Graduate students: 7Undergraduates: 4-6

Financial support (must be diverse!)DoE HEP: ~780k$/yr (70% Neptune, 30% off-campus)

Other: ~650k$/yrDoE BES+LCLS; NSF; LLNL/UC; foreign partners, industrial partners

PopulationFaculty: 2 (new hires coming)Profession researchers: 2Technical staff: 5Graduate students: 7Undergraduates: 4-6

Financial support (must be diverse!)DoE HEP: ~780k$/yr (70% Neptune, 30% off-campus)

Other: ~650k$/yrDoE BES+LCLS; NSF; LLNL/UC; foreign partners, industrial partners

Page 21: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

UCLA PBPL collaborators

UCLA PBPL collaborators

UCLA EE dept. PBWA; high brightness beam studies, sub-ps beams; IFEL

acceleration; laser-structure acceleration SLAC

ORION/E163; LCLS & FEL physics; RF techniques BNL ATF

fsec compression, CSR; FEL physics; RF gun development FNAL (recently inactive)

A0/TESLA injector; Plasma wakefield and lens experiments LLNL

Inverse Compton scattering; basic beam physics, velocity bunching, micro-focusing

INFN/Roma/Frascati/Milano Electron sources; beam dynamics; ultra-fast measurements

Past collab.: LANL, ANL AWA, Tel Aviv Univ.

UCLA EE dept. PBWA; high brightness beam studies, sub-ps beams; IFEL

acceleration; laser-structure acceleration SLAC

ORION/E163; LCLS & FEL physics; RF techniques BNL ATF

fsec compression, CSR; FEL physics; RF gun development FNAL (recently inactive)

A0/TESLA injector; Plasma wakefield and lens experiments LLNL

Inverse Compton scattering; basic beam physics, velocity bunching, micro-focusing

INFN/Roma/Frascati/Milano Electron sources; beam dynamics; ultra-fast measurements

Past collab.: LANL, ANL AWA, Tel Aviv Univ.

Students are exposed to national lab and university collaborators throughout education

Two way pipeline for sharing expertise; one-way pipeline for future employment

Page 22: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

PBPL Experimental Facilities

PBPL Experimental Facilities

State-of-the-art accelerator/laser labsNeptune Advanced Accelerator Lab

MARS 2-frequency TW CO2 laser (Joshi)Cutting edge photoinjector complex

PEGASUS Radiation LabOff-campus (PBPL aided in construction)

BNL ATFSLAC ORION & FFTBLLNL PLEIADES/FINDERINFN/LNF SPARC

State-of-the-art accelerator/laser labsNeptune Advanced Accelerator Lab

MARS 2-frequency TW CO2 laser (Joshi)Cutting edge photoinjector complex

PEGASUS Radiation LabOff-campus (PBPL aided in construction)

BNL ATFSLAC ORION & FFTBLLNL PLEIADES/FINDERINFN/LNF SPARC

Pegasus lab at UCLA

Page 23: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

EducationEducationGraduate course yearly: Physics 250 Introduction and special topics

Strong USPAS attendanceAlso involved as regular lecturers

Undergrad. course: Physics 150 Led to text Fundamentals of Beam Physics (Oxford, 2003)

Unified treatment of charged particle and laser beams

Research! Most projects student-centeredHands-on; all aspects of researchThesis projects aimed a PRL level>90 refereed publications (>70 PR)

Graduate course yearly: Physics 250 Introduction and special topics

Strong USPAS attendanceAlso involved as regular lecturers

Undergrad. course: Physics 150 Led to text Fundamentals of Beam Physics (Oxford, 2003)

Unified treatment of charged particle and laser beams

Research! Most projects student-centeredHands-on; all aspects of researchThesis projects aimed a PRL level>90 refereed publications (>70 PR)

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Page 24: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

PBPL graduates now spread throughout accelerator

community

PBPL graduates now spread throughout accelerator

community David Robin (CP). Accelerator Physics Group Leader at ALS Spencer Hartman (CP). Director, Raytheon microwave defense Gil Travish (JR). UCLA PBPL, associate researcher Andrei Terebilo (CP). SSRL scientist, SPEAR 3 Nick Barov (JR). Far-Tech, SBIR accelerator technology firm Mark Hogan (CP). SLAC ARDB scientist Eric Colby (JR). Panofsky Fellow, SLAC ARDB scientist Aaron Tremaine (JR). LLNL scientist, PLEIADES Compton source Xiadong Ding (CP). Titan, medical linacs Scott Anderson (JR). LLNL scientist, PLEIADES Compton source Alex Murokh (JR). RadiaBeam, SBIR accelerator technology firm Pietro Musumeci (CP). Univ. Roma, SPARC FEL project Matthew Thompson (JR). LLNL post-doc, advanced accelerators/X-rays Kip Bishofberger (JR). LANL post-doc, high brightness beams

2006: Joel England (JR), Gerard Andonian (JR), Jay Lim (JR) PBPL post-docs: SLAC/ANL/LLNL (5), Industry (1) Univ. (3) , Foreign (1)

David Robin (CP). Accelerator Physics Group Leader at ALS Spencer Hartman (CP). Director, Raytheon microwave defense Gil Travish (JR). UCLA PBPL, associate researcher Andrei Terebilo (CP). SSRL scientist, SPEAR 3 Nick Barov (JR). Far-Tech, SBIR accelerator technology firm Mark Hogan (CP). SLAC ARDB scientist Eric Colby (JR). Panofsky Fellow, SLAC ARDB scientist Aaron Tremaine (JR). LLNL scientist, PLEIADES Compton source Xiadong Ding (CP). Titan, medical linacs Scott Anderson (JR). LLNL scientist, PLEIADES Compton source Alex Murokh (JR). RadiaBeam, SBIR accelerator technology firm Pietro Musumeci (CP). Univ. Roma, SPARC FEL project Matthew Thompson (JR). LLNL post-doc, advanced accelerators/X-rays Kip Bishofberger (JR). LANL post-doc, high brightness beams

2006: Joel England (JR), Gerard Andonian (JR), Jay Lim (JR) PBPL post-docs: SLAC/ANL/LLNL (5), Industry (1) Univ. (3) , Foreign (1)

Page 25: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

“Backbone” of PBPL research: advanced

technology

“Backbone” of PBPL research: advanced

technologyConnects advanced accelerators to conventional community

Designed and built in-houseDesign codes (students, engineers)World-class shop

RF structures1.6 cell RF photocathode gunAdvanced RF accelerating structuresRF deflector for fs beam measurements

Magnetic devicesLinear, nonlinear beam optics, bendsPermanent magnet undulators, quads

Connects advanced accelerators to conventional community

Designed and built in-houseDesign codes (students, engineers)World-class shop

RF structures1.6 cell RF photocathode gunAdvanced RF accelerating structuresRF deflector for fs beam measurements

Magnetic devicesLinear, nonlinear beam optics, bendsPermanent magnet undulators, quads

BNL/SLAC/UCLA 1.6 cell RF gun (>10 made, still improving)Plane wave transformer injector

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Hybrid traveling wave/standing wave photoinjector

World’s record strength (560 T/m)

permanent magnet quadrupole

Page 26: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Diverse theoretical contributions

Diverse theoretical contributions

Space-charge dominated beamsEmittance compensation, chicane pulse compression, velocity bunching

Plasma wakefieldsBlowout regime, matching, ion collapse

FEL, Compton scatteringSASE, spiking, QFEL, TW undulator

Radiative effects in beamsCSR, CTR microbunching, diamag. fields

Dielectric accelerating structuresSlab symmetric laser-excitation, ultra-high field wakes

Space-charge dominated beamsEmittance compensation, chicane pulse compression, velocity bunching

Plasma wakefieldsBlowout regime, matching, ion collapse

FEL, Compton scatteringSASE, spiking, QFEL, TW undulator

Radiative effects in beamsCSR, CTR microbunching, diamag. fields

Dielectric accelerating structuresSlab symmetric laser-excitation, ultra-high field wakes

Ion collapse in PWFA afterburner scenarioJ.B. Rosenzweig, et al., PRL95, 195002 (2005)

Page 27: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results I: Neptune

IFEL

Recent Experimental Results I: Neptune

IFEL0.5 TW 10 m laserHighest recorded IFEL acceleration15 MeV beam accelerated to over 35 MeV in 25 cm

First observation of higher harmonic IFEL interaction

0.5 TW 10 m laserHighest recorded IFEL acceleration15 MeV beam accelerated to over 35 MeV in 25 cm

First observation of higher harmonic IFEL interaction

Energy analysis of Neptune IFEL experiment

P. Musumeci, et al., Phys. Rev. Lett. 94, 154801 (2005)

Page 28: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results II: Compton scattering @ LLNLRecent Experimental Results

II: Compton scattering @ LLNLApplications to:

Polarized positron collider

300 fs beams from velocity bunching

Focusing from PMQ ultra-strong final focus

Ultra-high peak brightness X-rays used in diffraction studies

Next stage (nonlinear Compton) at Neptune

Applications to:Polarized positron collider

300 fs beams from velocity bunching

Focusing from PMQ ultra-strong final focus

Ultra-high peak brightness X-rays used in diffraction studies

Next stage (nonlinear Compton) at Neptune

PMQ final focus system;15 micron beam image

Computed and measured Ta K-edge diffraction pattern at PLEIADESD. J. Gibson, et al.,, Phys. Plasmas, 11 2857 (2004)

Page 29: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results III: beam-plasma interactionRecent Experimental Results III: beam-plasma interaction

Experiments at FNAL A0 lab

Beam ~stopped in PWFA blowout expt 12 MeV in 8 cm

Underdense plasma lens (nb>np)Very low aberrationAsymmetric beams (LC scenario)

Experiments at FNAL A0 lab

Beam ~stopped in PWFA blowout expt 12 MeV in 8 cm

Underdense plasma lens (nb>np)Very low aberrationAsymmetric beams (LC scenario)

Spectrometer images (150 MV/m case)

Round beam, flat beam underdense plasma lens images

Page 30: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results IV: Compression and Coherent RadiationRecent Experimental Results IV:

Compression and Coherent Radiation 13 MeV experiments at Neptunetransverse phase space bifurcation

Velocity field dominant70 MeV BNL ATF expts now underway<100 fs beamsCoherent “edge” radiation

Phase space distortions from acceleration fields

13 MeV experiments at Neptunetransverse phase space bifurcation

Velocity field dominant70 MeV BNL ATF expts now underway<100 fs beamsCoherent “edge” radiation

Phase space distortions from acceleration fields

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Neptune slit-based phase space measurement; uncompressed and compressed beam

CERCTR

ATF/UCLA compressor CER energy v. RF phase

1

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2

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sig

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z (m)

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CTR autocorrelation of bunch length

S.G. Anderson, et al., Phys. Rev. Lett., 91, 074803 (2003).

Page 31: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results V: Ultra-broad spectrum

SASE FEL

Recent Experimental Results V: Ultra-broad spectrum

SASE FELBandwidth of up to 15% observed at high gain

Start-to-end simulations give details of microscopic physics

Red-shifting of off-axis modes dominant

Bandwidth of up to 15% observed at high gain

Start-to-end simulations give details of microscopic physics

Red-shifting of off-axis modes dominant

Ultra-wide measured bandwidth at VISA II

Output of start-to-end simulations of VISA II

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Measurement of double-differential spectrum

G. Andonian, et al., Phys. Rev Lett. 95, 054801 (2005)

Page 32: UCLA Advanced Accelerator Program (excluding PWFA@FFTB)

Recent Experimental Results VI: High Gradient Dielectric Wakes

Recent Experimental Results VI: High Gradient Dielectric Wakes

FFTB ultra-short beam, 100 m aperture tube: over 10 GV/m

Initial run gave breakdown threshold 4 GV/m surface field 2 GV/m

Damage post-mortem ongoing

FFTB ultra-short beam, 100 m aperture tube: over 10 GV/m

Initial run gave breakdown threshold 4 GV/m surface field 2 GV/m

Damage post-mortem ongoingEz from OOPIC simulation of hollow dielectric tube (OOPIC)

Ez lineout on-axis

0.0000 0.0004 0.0008 0.0012 0.0016 0.0020 0.00240.000000

0.000025

0.000050

0.000075

0.000100

0.000125

0.000150

z (m)

r (m

)

-1.255E10

-1.006E10

-7.560E9

-5.065E9

-2.570E9

-7.500E7

2.420E9

4.915E9

7.410E9

9.905E9

1.240E10

Ez

0.0000 0.0004 0.0008 0.0012 0.0016 0.0020 0.00240.000000

0.000025

0.000050

0.000075

0.000100

0.000125

0.000150

z (m)

r (m

)

-1.255E10

-1.006E10

-7.560E9

-5.065E9

-2.570E9

-7.500E7

2.420E9

4.915E9

7.410E9

9.905E9

1.240E10

Ez

0.0014 0.0016 0.0018 0.0020 0.0022

-1.20E+010

-9.00E+009

-6.00E+009

-3.00E+009

0.00E+000

3.00E+009

6.00E+009

9.00E+009

Ez

(V/m

)

Z (m)

0.0014 0.0016 0.0018 0.0020 0.0022

-1.20E+010

-9.00E+009

-6.00E+009

-3.00E+009

0.00E+000

3.00E+009

6.00E+009

9.00E+009

Ez

(V/m

)

Z (m)

View end of dielectric tube; frames sorted by increasing peak currentView end of dielectric tube; frames sorted by increasing peak current

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ConclusionsConclusionsUCLA represents a major resource in the national accelerator R&D programValued collaborator with nat’l labs

Leadership in Advanced concepts, ideas for futureComputational physicsTechnologiesExperimentsEducation - development of future leaders

Synergy between beams, HEP, light sourcesHands on and multi-disciplinary program is very attractive to students

Let’s keep going!

UCLA represents a major resource in the national accelerator R&D programValued collaborator with nat’l labs

Leadership in Advanced concepts, ideas for futureComputational physicsTechnologiesExperimentsEducation - development of future leaders

Synergy between beams, HEP, light sourcesHands on and multi-disciplinary program is very attractive to students

Let’s keep going!