Acc. Phys. courses
IU Acc. Phys. Group
Postdocs and Visitors:
Scientists graduated from IU Ph.D. program:
J.E. Goodwin (Ph.D. awarded 1989)
T. Ellison (Ph.D. awarded 1990)
M. Minty (Ph.D. awarded 1991, now at SLAC)
A. Pei (Ph.D. awarded 1992, now work at Industry)
D. Li, (Ph.D. awarded, April 24, 1995, now at LBNL)
H. Huang, (Ph.D. awarded, April 24, 1995, now at BNL)
M. Ellison, (Ph.D. awarded July 21, 1995, now at U. Colorado)
S. Nagaitsev (Ph.D. awarded 1995, now at Fermilab)
X. Kang(Ph.D. awarded 1998, Now at University of Washington)
A. Riabko (Ph.D. awarded 1998, Now work at Industry)
M. Bai (Ph.D. March, 1999)
Winner of the McCormick Science Grant 1998 (Indiana University)
Winner of 1999 APS DPB outstanding thesis award
Collaborators in Cooler Ring Experiments:
M. Ball, J. Budnick, V. Derenchuk, G. East, D. Friesel, B. Hamilton,
W.P. Jones, A. Pei, T. Sloan
Mari Berglund, (Uppsala),
D.D. Caussyn (FSU),
A. Chao (SLAC),
P. Colestock (Fermilab),
K. Hedblom (Uppsala),
M.G. Minty (SLAC),
K.Y. Ng (Fermilab),
M. Syphers (FNAL),
Y. Yan (SLAC).
AP information web
USPAS (U.S. Particle Accelerator School)
USPAS web at Fermilab
R & D Projects
- Nonlinear beam dynamics expreriments at IUCF Cooler Ring
- CE22 - Nonlinear beam dynamics experiments at the IUCF Cooler Ring.
- CE34 - Cooler Modeling (completed)
- CE37 - beam transfer function measurement in the Cooler Ring.
- CE48 - Nonlinear beam dynamics experiments (completed)
- CE63 - Nonlinear beam dynamics and beam manipulations.
- Electron Cooling at the IUCF Cooler Ring
Since 1994, we have been studying the effect of electron cooling on
proton beams. We found that when the relative velocity between the proton
beam and cooling electrons is larger than the velocity spread of cooling
electrons, the proton beam will encounter Hopf bifurcation into a ring
in the phase space. using this technique, we can measure the
"effective electron temperature".
We observe the co-existence of fixed point attractor and limit
cycle attractor. This shows for the first time the evidence of
two-component theory of electron cooling. (see Pub. 1994-1996).
- Chaos and resonances in dynamcal systems:
Longitudinal and Transverse beam dynamics:
- Space charge dominated beam studies:
We introduce KV-envelope phase space coordinates
to express the KV envelope equation in Hamiltonian formalism.
The effects of space charge force on envelope and particle Hamiltonian
can be analyzed analytically. This method has been shown to agree well
with results obtained from numerical simulations.
Thus the effect of global chaos on the Hamo formation can be analyzed
analytically. (see Pub. 1995)
For periodic focusing systems, there are many
structure resonances. (1995)
- Cooler Injecter Synchrotron ( Injector) and
Light Ion Spin Synchrotron(LISS)
- RF dipole spin manipulation at AGS: Experimental Results
- Spin dynamics experiments at AGS E880 .
The snake experiment at the IUCF Cooler Ring
A recent study on the overlapping synchrotron sideband resonances
analyzes polarization data measured at the SPEAR and the IUCF Cooler Ring
(see Pub. 1996).
We find that (1) the synchrotron sideband spin resonances can only
be corrected by correcting its principal resonance, and
(2) the synchrotron sideband spin resonances for polarized proton
can be summed to change the spin precession phase.
- Particle dynamics of quasi-isochronous (QI) storage rings
The equation of motion for particle in QI storage rings can be transformed
into the universal Weierstrass equation. Sum rules for the resonance strength
function are derived. Including synchrotron radiation damping and the
rf phase modulation, the QI
equation of motion becomes
x''+Ax'+x-x²=B\omega_m \sin \omega_m t.
This QI dynamical system exhibits
global chaos and strange attractor in a region of
the rf modulation tune. The stability of the QI dynamics is determined by
the 2:1 and 1:1 parametric resonances. (see Pub. 1996)
Our current effort is to study the quantum fluctuation and
the multiparticle effects such as potential well distortion,
intrabeam scattering etc.
- Particle Diffusion Experiments: