ACCELERATOR PHYSICSAT

NORTHERN ILLINOIS UNIVERSITY

Courtlandt L. BohnNorthern Illinois University

Department of Physics

(as of 15 August 2005)

Proximity to Two Major LaboratoriesProximity to Two Major Laboratories

NIU

FNAL

ANL

0 10 km

Aerial View of University(location: DeKalb, Illinois)

Aerial View of University(location: DeKalb, Illinois)

Faraday Hall: Home of Physics DepartmentFaraday Hall: Home of Physics Department

Jim Brau, Cornell, July 13, 2003

3

W hy Accelerat or s M att er

To realize this opportunity of a lif etime, we will need both accelerators and telescopes, and that’s why accelerators matter

Beam Physics and Astrophysics GroupMain Interests

Beam Physics and Astrophysics GroupMain Interests

Production of high-brightness beams (electron, hadron)

High-resolution electron-beam diagnostics:

interferometry (transition radiation)

electro-optic sampling (electromagnetic fields)

Theory and simulation of space charge:

chaos in time-dependent systems

mixing in N-body systems (beams, galaxies)

multiresolution analysis (wavelet-based algorithms)

Production of high-brightness beams (electron, hadron)

High-resolution electron-beam diagnostics:

interferometry (transition radiation)

electro-optic sampling (electromagnetic fields)

Theory and simulation of space charge:

chaos in time-dependent systems

mixing in N-body systems (beams, galaxies)

multiresolution analysis (wavelet-based algorithms)

Beam Physics and Astrophysics GroupPeople

Beam Physics and Astrophysics GroupPeople

Faculty: Court Bohn, Bela Erdelyi, Philippe Piot

Postdocs: Daniel Mihalcea, Ioannis Sideris, Balša Terzić

Graduate Students: Greg Betzel, Marwan Rihaoui, Ily Vass

Many collaborators

For more information, see http://nicadd.niu.edu/research/beams

Faculty: Court Bohn, Bela Erdelyi, Philippe Piot

Postdocs: Daniel Mihalcea, Ioannis Sideris, Balša Terzić

Graduate Students: Greg Betzel, Marwan Rihaoui, Ily Vass

Many collaborators

For more information, see http://nicadd.niu.edu/research/beams

Beam Physics and Astrophysics GroupBeowulf PC Cluster

Beam Physics and Astrophysics GroupBeowulf PC Cluster

56 dual-processor nodes linked via 100 Mbit network Server: 1GB RAM, 2x Athlon 2600+, shared 1.5TB raid array Worker nodes: 1GB RAM/node, Amd Opteron 1800 (2x15

nodes), Amd Atlon 2400+(2x24), 1800+(2x16), shared disk space: 4.5TB

Software:

PV-WAVE (visualization, data analysis)

ROOT (analysis of large data bases),

LAM (enables parallel processing)

CONDOR (managing batch jobs)

56 dual-processor nodes linked via 100 Mbit network Server: 1GB RAM, 2x Athlon 2600+, shared 1.5TB raid array Worker nodes: 1GB RAM/node, Amd Opteron 1800 (2x15

nodes), Amd Atlon 2400+(2x24), 1800+(2x16), shared disk space: 4.5TB

Software:

PV-WAVE (visualization, data analysis)

ROOT (analysis of large data bases),

LAM (enables parallel processing)

CONDOR (managing batch jobs)

Beowulf PC ClusterBeowulf PC Cluster

56 nodes 112 CPUs in a climate-controlled room56 nodes 112 CPUs in a climate-controlled room

Status: Funding is in hand to build the Lab; equipment is on orderPlans: Electron gun (borrowed from Argonne)

Titanium-Sapphire femtosec-class laser (to be purchased)UHV preparation capabilityState-of-the-art electronics and controls

Context of Accelerator Physics ProgramContext of Accelerator Physics Program Electron photoinjectors and linacs for

Linear Collider (Fermilab)

X-ray FEL (Argonne)

high-average-power FEL (Argonne, Jefferson Lab) Hadron linear accelerators for

isotope production (Argonne, Fermilab?)

neutrino physics (Fermilab) Proton booster synchrotron with high current for

neutrino physics (Fermilab)

Electron photoinjectors and linacs for

Linear Collider (Fermilab)

X-ray FEL (Argonne)

high-average-power FEL (Argonne, Jefferson Lab) Hadron linear accelerators for

isotope production (Argonne, Fermilab?)

neutrino physics (Fermilab) Proton booster synchrotron with high current for

neutrino physics (Fermilab)

Overview ofExperiments and

Hardware Development

Overview ofExperiments and

Hardware Development

Fermilab/NICADDPhotoinjector Laboratory

Electron source at A0 Jointly operated by

Fermilab/NICADD Beam Physics International Facility

(Chicago, Cornell, Georgia, Michigan, NIU, Rochester, UCLA, Fermilab, DESY, LBL, INFN Milan)

Longitudinal density profile of compressed 3 nC bunches:

measured (red) vs. PARMELA with 20,000 particles (blue).

Longitudinal Density Profilevia Interferometry of

Coherent Transition Radiation

Electro-Optical SamplingElectro-Optical Sampling

Proof-of-principle experiment (and Univ. of Rochester Ph.D. dissertation for M. Fitch): Measured beam-inducedwakefield of 6-way cross.

Goal for future work: Measure beam field directly (not wakefield) to infer the beam density profile. A key: need low-impedance vacuum chamber.

Ultimate objective:Noninvasive bunch monitor

Overview ofTheory Program

(more information can be found in Group publications)

Overview ofTheory Program

(more information can be found in Group publications)

NONEQUILIBRIUM BEAM: A CARTOON

Transient Chaos in a Breathing BunchTransient Chaos in a Breathing Bunch

log10|f(t)| vs. t

Impact of Unavoidable Noise on HaloImpact of Unavoidable Noise on Halo

Breathing mode Internal mode (oscillating envelope) (stationary envelope)

Both the topology of the mode(s) and the strength of the noise areimportant to halo formation.

Breathing mode Internal mode (oscillating envelope) (stationary envelope)

Both the topology of the mode(s) and the strength of the noise areimportant to halo formation.

|| = 10-3 || = 10-3

WaveletsWavelets

(a) Haar wavelet, (b) Morlet wavelet,(c) Daubechies wavelet.

1D

Daubechies least symmetricN = 10 two-dimensional wavelet.

2D

Fermilab/NICADD Photoinjector SimulationsFermilab/NICADD Photoinjector Simulationsrms beam radius (mm) rms normalized transverse

emittance (μm)

rms bunch length (mm)

rms normalized longitudinalemittance (ps-keV)

Simulations of AES/JLab PhotoinjectorSimulations of AES/JLab PhotoinjectorGreen Function + Fast Fourier Transform

Wavelets + Preconditioning

SummarySummary Northern Illinois University is serious about accelerator

physics

Focus is basic research, especially as concerns:

Production, measurement of high-brightness beamsFundamental understanding of space-charge dynamicsImproved simulation codes to include multiscales, halo

In-house facilities are in place for theory, computations, and small-scale laboratory work

Many collaborations are in place, including with Fermilab and Argonne

We seek excellent students who are likewise serious!

Northern Illinois University is serious about accelerator physics

Focus is basic research, especially as concerns:

Production, measurement of high-brightness beamsFundamental understanding of space-charge dynamicsImproved simulation codes to include multiscales, halo

In-house facilities are in place for theory, computations, and small-scale laboratory work

Many collaborations are in place, including with Fermilab and Argonne

We seek excellent students who are likewise serious!

We plan shortly to establish a special fellowship:

The

NICADD Fellowship in Accelerator Physics

Very competitive: for especially gifted students At most 2 recipients per year Annual stipend of ~$30,000 Full tuition waiver

We plan shortly to establish a special fellowship:

The

NICADD Fellowship in Accelerator Physics

Very competitive: for especially gifted students At most 2 recipients per year Annual stipend of ~$30,000 Full tuition waiver

AnnouncementAnnouncement