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ACCELERATOR PHYSICS

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Title: Slide 1 Author: keith lowman Last modified by: Gateway_User Created Date: 7/11/2005 7:35:19 PM Document presentation format: On-screen Show Company – PowerPoint PPT presentation

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Title: ACCELERATOR PHYSICS


1
ACCELERATOR PHYSICS AT NORTHERN ILLINOIS
UNIVERSITY Courtlandt L. Bohn Northern Illinois
University Department of Physics (as of 15
August 2005)
2
Proximity to Two Major Laboratories
3
Aerial View of University (location DeKalb,
Illinois)
4
Faraday Hall Home of Physics Department
5
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6
Beam Physics and Astrophysics Group Main
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)

7
Beam Physics and Astrophysics Group People
  • Faculty Court Bohn, Bela Erdelyi, Philippe
    Piot
  • Postdocs Daniel Mihalcea, Ioannis Sideris,
    Balša Terzic
  • Graduate Students Greg Betzel, Marwan Rihaoui,
    Ily Vass
  • Many collaborators
  • For more information, see http//nicadd.niu.edu/re
    search/beams

8
Beam Physics and Astrophysics Group Beowulf 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)

9
Beowulf PC Cluster
56 nodes ? 112 CPUs in a climate-controlled room
10
Status Funding is in hand to build the Lab
equipment is on order Plans Electron gun
(borrowed from Argonne) Titanium-Sapphire
femtosec-class laser (to be purchased) UHV
preparation capability State-of-the-art
electronics and controls
11
Context 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)

12
Overview of Experiments and Hardware Development
13
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14
Longitudinal Density Profile via Interferometry
of Coherent Transition Radiation
Longitudinal density profile of compressed 3 nC
bunches measured (red) vs. PARMELA with 20,000
particles (blue).
15
Electro-Optical Sampling
Proof-of-principle experiment (and Univ. of
Rochester Ph.D. dissertation for M. Fitch)
Measured beam-induced wakefield 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
16
Overview of Theory Program (more information can
be found in Group publications)
17
NONEQUILIBRIUM BEAM A CARTOON
18
Transient Chaos in a Breathing Bunch
log10f(t) vs. t
19
Impact of Unavoidable Noise on Halo
???? 10-3
???? 10-3
Breathing mode Internal mode
(oscillating envelope) (stationary
envelope) Both the topology of the mode(s) and
the strength of the noise are important to halo
formation.
20
Wavelets
1D
2D
  • Haar wavelet, (b) Morlet wavelet,
  • (c) Daubechies wavelet.

Daubechies least symmetric N 10 two-dimensional
wavelet.
21
Fermilab/NICADD Photoinjector Simulations
rms beam radius (mm)
rms normalized transverse emittance (µm)
rms bunch length (mm)
rms normalized longitudinal emittance (ps-keV)
22
Simulations of AES/JLab Photoinjector
Green Function Fast Fourier Transform
Wavelets Preconditioning
23
Summary
  • Northern Illinois University is serious about
    accelerator physics
  • Focus is basic research, especially as
    concerns
  • Production, measurement of high-brightness beams
  • Fundamental understanding of space-charge
    dynamics
  • Improved 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!

24
Announcement
  • 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
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