Students interested in applying for a CASPER Fellowship should begin the application process by reading the
descriptions of the active research areas within CASPER which are listed below.
A brief description of each research area along with selected papers and related links are supplied to provide
applicants with relevant background material. A more comprehensive description with a list of selected CASPER
papers and background reading material is included as a single pdf document below.
Selected CASPER papers and background reading material.
CASPER - HIDPL/SSL Summaries
Low Velocity Impact Studies/Dust Detector Design - Truell Hyde, Lorin Matthews, Jorge Carmona, Mike Cook, Jimmy Schmoke
Spacecraft in near-earth orbit and on deeper space missions are subject to damage from impacts with
interplanetary dust and orbital debris. Low impact studies are designed to characterize the dust encountered
in space and test materials for damage. Several experiments using two single-stage gas guns are underway, including:
- Corroboration of the sensitivity map for the stainless steel plate with piezoelectric lead zirconate titanate (PZT) crystals attached. The voltage and resonant frequency of the output from the sensor must be measured. A full understanding of the sensitivity map requires understanding not only the electrical response from the PZTs but also the acoustics of the plate, which must be measured as well.
- Completion of experiments on damage assessment of aluminum and stainless steel plates, using different projectile materials and sizes.
- Analysis of laser fan data, which measures the projectile's velocity in flight, to determine particle dimensions by the shape and amplitude of the signal.
Small Satellite Studies/Dust Detector Design - Truell Hyde, Rene Laufer, Lorin Matthews, Jorge Carmona, Mike Cook, Jimmy Schmoke
Small Satellites provide opportunities for research in near-earth orbit and as components of deeper space missions. As mentioned above, CASPER has specific interest in the detection of
interplanetary dust and orbital debris. The Space Science Lab within CASPER currently has several active flight missions on which they will be providing the science instrument. The first of these is scheduled for launch in August of 2012 and will include a new dust detector design with heritage from flight instruments that have flown on missions to Halley's comet and Saturn.
Development of these dust detector experiments is currently underway. As such, REU Fellows can participate in (among others):
Dust Crystals in an RF Reference Cell - Truell Hyde, Lorin Matthews, Jie Kong, Ke Qiao, Bernie Smith, Jorge Carmona, Mike Cook, Jimmy Schmoke
Dust particles immersed within a plasma environment acquire an electric charge. If the ratio of the inter-particle potential
energy to the average kinetic energy is high enough the particles can form a "liquid" structure with short-range ordering,
a crystalline structure with longer range ordering or a mixture of the two. A variety of experiments within complex plasmas
investigating nano- and meso-scale physics will be on-going during the coming summer. Additionally, the S100 nano-manipulator
brought on-line in June 2005, provides unparalleled perturbative capabilities for the lab. Complete lab diagnostics and
theoretical simulation capabilities as well as full-time technical support providing machining capability and electronics
R&D are also available to Fellows working within the HIDPL. A list of current projects available along with background reading
material, is appended to this document.
CASPER – Experimental Astronomy Summaries
Experimental Astronomy - Dr. Dwight Russell and Mr. Dick Campbell
Using the CTAS(Central Texas Astronomical Society) telescope at the Clifton site, in collaboration with the UT astronomy department, we will
study luminosity curves for white dwarf stars. The data will be taken and used to study periodic variations in the intensities of these stars.
The expected periodicity is in the range of 1s to 1000s. This time scale allows for usable data to be taken in the relatively short period
of time of one night to a few nights. The CTAS telescope is a state of the art computer controlled facility. The collaboration with UT-Austin
will put this research into a larger context of white dwarf physics helping to guide this work toward publishable results. As part of this project,
the student(s) will be involved in:
Central Texas Astronomical Society
- star selection
- operation of the CTAS telescope via the internet interface
- the recording and analysis of the data. Raw Data will be in the form of CCD images that will need to be converted to light curves.
CASPER – ASSTG Summaries
Numerical Simulation of Plasma Crystals - Truell Hyde, Lorin Matthews, Ke Qiao, Jie Kong
Dust particles immersed within a plasma environment, such as those found in nanomanufacturing or in protostellar clouds, planetary rings or
cometary environments, acquire an electric charge. If the ratio of the inter-particle potential energy to the average kinetic energy is
high enough the particles will form either a "liquid" structure with short-range ordering or a crystalline structure with long range ordering.
Properties of these dust crystals have been studied within CASPER both numerically and experimentally. The following numerical simulations utilize the Box_Tree code.
- Structure and phase transitions in 2D and 3D plasma crystals.
- Wave properties of a bilayer system (particle populations with different sizes).
- Simulation of wake force caused by ion drag and study of its effect.
- Simulation of the thermophoretic force and study of its effect.
The results of numerical simulations, such as the dispersion property of the out of plane transverse DLW mode recently discovered theoretically,
can also be verified experimentally in the HIDPL A list of current projects available within the CASPER theory group, along with background
reading material, is appended to this document.
Kuiper Belt Studies - Truell Hyde, Ray Nazzario
Recent observations show that binary Kuiper Belt objects exist contrary to most theoretical expectations. (These are the same objects that
recently resulted in the 'demotion' of Pluto.) Although their creation presents problems in current models, the inclusion of a third body
(ex. one of the outer planets or a forming protoplanet) often provides several of the necessary conditions for their formation. The presence
of such a perturbing body can also provide clearing of the primordial Kuiper Belt while at the same time producing quasi-stable, longer-lived
binary Kuiper belt objects. Numerical investigations involving a fifth order Runge-Kutta algorithm are employed to examine the situation described.
Up to thousands of Kuiper belt sized objects are simulated to look for the formation of binaries (along with structure of the resulting belt) in
both solar systems and protoplanetary situations. The interparticle gravitational interactions can create one of several effects; scattering into
the Oort cloud, collisions with nearby growing protoplanets, formation of binary pairs, or creation of a single Kuiper belt object. Additionally,
the initial location of the progenitors of the Kuiper belt objects may also have a significant effect on binary formation with objects near resonances
tending not to form binary objects. A list of current projects available within the CASPER theory group, along with background reading material,
is appended to this document.
Numerical Simulation of Preplanetary Dust Aggregation - Truell Hyde, Lorin Matthews
Recent data from the Hubble telescope show that planetary formation from the cloud of gas and dust orbiting a new protostar is a
much more efficient process than first believed and may occur on a time scale of less than 10 million years. Initially uncharged grains in space
and laboratory plasma environments become charged due to currents driven by potential differences in the dusty plasma. Certain macroscopic
effects such as coagulation of smaller grains into larger fluffy aggregates are then affected by the grain charge. The charge distribution on the
aggregate structure itself appears to play a role in determining the coagulation rate for the dust population. As particles collide, a numerical
code can be used to determine the effect of the dipole and higher multipole charge distributions on the openness of the resultant fractal aggregate
and the coagulation rates of the particles. A list of current projects available within the CASPER theory group, along with background reading
material, is appended to this document.
Gravitoelectrodynamics in Saturn's Rings - Truell Hyde, Lorin Matthews
Saturn's magnetic field exerts a significant perturbative force on charged micron- and submicron-sized grains in its ring system. This force has
been shown to cause the formation of "spokes" in Saturn's B ring and may play a large role in the formation of the evolving clumps,
kinks, braids and waves observed in Saturn's F Ring. These effects can be modeled numerically using the Box_Tree code and can be used to predict
or explain new features that currently being seen by the Cassini probe in orbit around Saturn. A list of current projects available within the
CASPER theory group, along with background reading material, is appended to this document.
CASPER - EUCOS Projects
Theoretical Early Universe Cosmology and Superstrings - Gerald Cleaver
Over the last two decades, the theorized number of (meta)-stable string vacua (models) has jumped from only a few trillion to anywhere
from 10^100 to 10^1000. The collection of these string models has become known as the string landscape. No longer do string phenomenologists
concentrate on examining the phenomenology and features of individual models, but on the common phenomenology of models within local neighborhoods
on the string landscape. Thus, gradually different pieces of the landscape will become understood and eventually the pieces may fit together.
At Baylor, properties of a class of models known as free fermionic heterotic models are under study, with primary attention given to special
collection of them known as NAHE-based (named after the originators of this type of model-Nanopoulos, Antoniadis, Hagelin, and Ellis) free
fermionic heterotic string models.
REU students proficient in C or C++ are invited to assist in the development of associated software. REU
students will be working with Ph.D. student Doug Moore to parallelize the primary systematic string model construction and analysis programs or with Ph.D. student Jared Greenwald on a program that systematically analyzes complete sets of (D- and F-)flat
directions and the resulting ranges of phenomenology, especially those of hidden sector (dark) matter.
Department of Physics Research Projects
Experimental Surface Chemical Physics - Ken Park, Zhenrong Zhang
The research program aims to understand how the nanometer-scaled local structure of metal supported oxide nanocatalysts influences the photo-conversion
of CO2 with H2O to methane and methanol fuels. The approach will be to 1) synthesize ordered oxide (ZrOx and TiOx) nanostructures and ultrathin films
on the metal single crystal surfaces, and 2) follow the thermally and photo- activated surface reaction processes (adsorption, dissociation, diffusion
and orientation dynamics) of molecular species (reactant molecules, possible intermediates and product molecules) on these oxides. In situ scanning
tunneling microscopy (STM) coupled with other spectroscopic tools (AES, XPS, TPS and RAIRS) will be used to ascertain fundamental issues such as a) the
site-specific elementary reaction pathways, b) charge transfer processes at the metal/oxide interface, c) detailed reaction material and structural
sensitivities, and d) the interplay between thermal and non-thermal processes.
Experimental Condensed Matter Physics - Dr. Linda Olafsen
Dr. Linda Olafsen's research focuses on the optical and electronic properties of semiconductor heterostructures, particularly those which are antimonide-based
and may be layered for emission and absorption in the mid-infrared portion of the electromagnetic spectrum. These "wave-function engineering" devices have
within their structures elaborate combinations of finite quantum wells and tunneling barriers, making them very practical applications of introductory quantum
mechanics. The target wavelength range is between 3 and 5 μm, and these wavelengths are important for countermeasures and for developing chemical sensors that
are at least 100 times more sensitive than those operating in the near-infrared. Her laboratory has a unique capability for tuning the near-infrared optical
pumping wavelength using an optical parametric oscillator, and she is working to more directly connect optical pumping and electrical injection experiments in
the development of mid-infrared devices.
Experimental High Energy Physics - Jay R. Dittmann & Kenichi Hatakeyama
The Experimental High Energy Physics group at Baylor is engaged in elementary particle physics research at the European
Organization for Nuclear Research (CERN) in Geneva, Switzerland and the Fermi National Accelerator Laboratory (Fermilab)
in Batavia, Illinois. At CERN, protons are accelerated to nearly the speed of light by the Large Hadron Collider, the
most powerful particle accelerator in the world. Beams of protons collide at the center of the several massive detectors,
and data recorded from these energetic collisions help physicists to identify the properties of the elementary particles
that make up the universe. REU students who join Baylor's High Energy Physics group during the summer will have an
opportunity to learn the fundamentals of high energy physics research by analyzing data from the CMS detector. You'll
learn the answer to questions like: How does a particle accelerator work? What happens when protons collide? How do
physicists detect particles that emerge from proton-proton collisions? At Baylor, you'll have the opportunity to analyze
actual data from particle collisions or to create software that is useful for the operation of the CMS detector.
This project is especially well suited to students who are skilled with computers and have some experience with C++ or java.
CMS Experiment at CERN
CDF Experiment at Fermilab