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
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