February 2014: Using the PVC STM.
The time finally arrived to turn on the PVC scanning tunneling microscopes and image nano-scaled stuff. With a little work, all four lab groups were able to get their microscopes to take images. The group shown in the picture saw the smallest feature ever seen in the history of PHYS 331 (Intro to Nanotechnology) at WWU with a 16 nm trench.
January 15, 2014: PVC STM.
The PVC scanning tunneling microscope that we are building for lab in Nanotechnology is coming together nicely. The connections from the computer come into the green boards and then are wired to the white board where our electronics reside. The stepper motor is clamped onto the PVC STM with a hose clamp - we are really going high-tech.
January 2014: Cutting Metal.
The second quarter of Experimental Physics has started off with learning to cut metal. In lab, we machined one piece of aluminum (6000 series alloy) using the end mill and another piece of aluminum (2000 series alloy) using the lathe. The two parts pictured are the ones cut on the lathe. They will be used in the Introduction to Nanotechnology Lab as motor couplings.
In a rare break with tradition, we managed to cut threads the hole in the top and the side without breaking any cutting taps.
October 2013: Slow-motion launch.
As the leaves start to fall, General Physics and Principles of Physics get to shoot projectiles. This year the weather was good and the rockets flew far. Click here to see a slow motion video of rockets leaving the launch stand. The condensation from the rapid pressure changes shows up nicely.
September 2013: Summer Research
Dr. Liebrand has been working on solar projects for the last several years. This summer, Dr. Liebrand and physics major, Thomas Blum, have worked on a process to increase the output of solar cells.
August 2013: Summer Research
As mentioned in a previous news post, the Physical Electronics lab has been using a boron process to make pnp transistors since Spring 2012. The process needs refinement, so this summer Dr. Ekkens spent a bit of time working on the process. In the picture, the color on the wafer is where the boron has been cooked onto the wafer surface.
February 2013: Spring Constants
In Conceptual Physics, we study properties of solids. One of the properties for consideration in lab this week was spring constants. We looked at the spring constant of plastic bags by stretching them until the bag broke. We found a standard bag can support up to 12 kg for a short time.
October 2012: Rockets
School has just started, the leaves are falling, and so are the rockets. October always brings the rocket lab in General Physics and Principles of Physics - a chance to study projectiles in motion while enjoying a sunny day outside. In the picture at the left, two red spots are just visible in the center of the sky. One is a rocket going up and the other is another rocket coming down. The trick to surviving the lab is to not be under the rocket as it comes down.
September 2012: Summer Projects
Many of our students leave for the summer. A number of them were doing research or internships at companies and labs scattered around the country. One physics major, Darryl, did spend the summer here working on building a ring interferometer. The laser head, some of the mirrors, and the slip-ring assembly are shown in the picture. By the end of summer it was mostly working.
May 2012: pnp Junction.
In Physical Electronics lab, we have tried making a transistor as one of the final labs of the quarter. Over the past eight years, several different build processes have been tried but the transistor has never worked. This year was different and with a new boron process, the device shown in the picture works as a pnp transistor. We still need to improve the process a bit so the transistor is a bit more reliable and has a better gain. Now . . . only 499,999,999 more and we will have a single CPU.
April 2012: Trebuchet!
One of the advantages of a small physics department is that students can use the lab space and machine shop to work on personal projects. Darryl has built a number of projects during his time at Walla Walla University. This spring has seen the test firing and exhibition firing of his Mark II trebuchet.
March 2012: Superconductivity.
For the last part of Nanotechnology Lab, we made a Type-II superconductor. Once it was baked, it was time to break out the liquid nitrogen and test it. Sadly it failed, but we had the ones from previous years to play with. In the picture on the left, a permanent magnet is levitating over the superconductor.
February 2012: Ferrofluids.
In the nanotechnology lab we have been looking at several magnetic systems. The most recent lab involved ferrofluids. Ferrofluids are most often used in sealing the area around rotating shafts.
In our lab we just looked at the different shapes we could make while applying external magnetic fields. In the picture at the right, a magnet from a hard drive is held under the glass dish and the spikes are at the approximate ends of the magnet. While a good time was had by all, some of the magnets still are stained.
A short video of the fun is here.
February 2012: STM Results.
The scanning tunneling microscopes are complete and imaging. They have plenty of room for further improvement, but the basic functionality is there. In the picture below, the scanning tip is shown on the left. The tip is held in the black piece and extends down to the copper sheet that is being scanned. On the right is data from a calibration standard. The field of view is 3000 nm which means the resolution is 300 nm or better for this microscope.
January 2012: Nanotechnology.
Introduction to Nanotechnology is being taught this winter quarter. In lab we are again building a scanning tunneling microscope. Two years ago when the course was last taught, the best resolution from the student STM was about 1,000 nm. We are trying to best that.
This year we have replaced some of the analog electronics with a higher-powered data acquisition card (NI-6229). Three labs in January got us to finished hardware. In this picture, the electronics are being connected and tested. The next steps are to load in a sample and measure resolution.
December 2011: Circuit Boards.
A new lab this year was building circuit boards in Experimental Physics I. We used simple equipment and processes so the result is environmentally friendly (we are using a Ferric-Chloride-free process) and inexpensive enough that the students can make circuit boards at home. The total cost of the lab is about $5 per board and does not require anything beyond the parts available at ACE Hardware, Ebay, and Walmart.
November 2011: New Oscillosopes.
B&K Precision Instruments has donated to the physics department seven 2530B digital oscilloscopes. The new scopes replace cheaper scopes and allow much easier transfer of data to the computer. So far, the features on the new scopes have been used heavily in upper division labs and for robotic club testing.
In the picture, the chaotic behavior of a diode circuit is being tested and displayed on the new scope. The xy-scan mode of the new scopes allows for a much better visualization of certain effects.
September 2011: Zeeman Effect
The big summer project that Calvin worked on was building the Zeeman Effect apparatus for Dr. Liebrand. This project has been tried during past summers but has never showed the right result. This summer was different and with a little help from Darryl in depositing the right amount of aluminum on some optical parts, Calvin built and aligned the system. One week before school was to start, the splitting effect was documented. Good job, Calvin.
The completed Zeeman apparatus will be used in the Modern Optics Lab which Dr. Liebrand teaches every two years.
August 2011: Machine Shop!
This summer, two physics majors - Darryl and Calvin - worked on several projects in the Physics Department. One of the biggest projects was to create a machine shop. Space was cleared in a storeroom and a large counter was installed. The existing band saw and end mill were mounted on the counter top. A lathe and table vice were purchased to add to the collection. Every week more tools and supplies are purchased. A drill press is the next big piece of equipment to install.
The machine shop is already in heavy use. Much of the summer work that Darryl and Calvin did included making parts on the existing equipment or waiting for the next tool to arrive. Since space in the shop is limited, the end mill and lathe are of hobby size. Parts larger than 6 inches need to be fabricated on tools found in the engineering shop.
June 2011: Finals!
It is finals time and students are studying hard and taking hard tests. Dr. Ekkens allows a sheet of equations for his tests. However, it is critical to get the right equations for the subject material. While Maxwell's Equations are amazing and accent any wardrobe choices with a touch of class, they are of limited help on a test covering semiconductors.
May 2011: LIGO Field Trip
The Astronomy Class usually takes a trip to the gravitational wave detector (LIGO) at Hanford. This year the physics majors and some honors students joined the trip. The system is being updated to Advanced LIGO so we were able to see some of the new hardware ready for installation.
April 2011: Chaos
Three senior physics majors are taking a directed study course this quarter covering chaos. Each week, the class reads a chapter in a history of chaos book. Then during class, each person works on a computer program or other project to model the chaotic system that was covered in the reading. In the picture, the design on the left was created using three rules, a random number generator, and about 30 minutes of programming time. The fern on the right uses six rules and was not assigned for class.
December 2010: Faculty Research
Roy Campbell spent the Autumn quarter of 2010 on sabbatical doing research in biophysics. In early December, he presented a physics seminar for faculty and interested students and will be giving a paper at the March APS meeting in Dallas entitled Maximum Caliber Analysis of Ion-Channel Gating.
August 2010: Summer Projects
This summer, two physics majors - both named Jeff - worked on several projects in the Physics Department. The large projects were a design for the circuit board for the student STM, calibration of a resonant crystal to determine metal deposition thickness, and an improved build process for pn junctions. The resulting pn junction is shown in the picture.
June 2010: Summer Classes
This summer, the Physics Department is offering two quarters of Astronomy. The flexible course times allow observation events that don't fit well into the normal school year. Several transfer physics majors also worked on making up a lab course. The lab course covered programming, mechanical design considerations, and electronics. The final project of the course integrated all these elements into a robot armed with a low-power laser that shoots at anyone making noise.
March 2010: Solar Array in Service
All connections have been made. The inspections are complete. The monitoring hardware and software is in place. The system is switched on at 5:00 pm on March 9, 2010. Now we collect photons and data.
February 2010: Solar Energy Project
All six panels are mounted to the roof. The inverters are in place and wired to the new gray box on the side of the observatory. The panels are not connected to the inverters yet.
January 2010: Plasma
In Experimental Lab II, we are looking at a variety of experiments. The second lab of the quarter dealt with vacuum systems. We created a plasma at 100 mTorr and watched how it behaved as we turned up the voltage. This arc seems to happen only when we use an older power supply.
December 2009: Solar Energy Project
Dec. 16, Update. Solar panels are being mounted to the roof of Kretschmar Hall near the observatory. The first three panels are up. The next three are waiting for some mounts to be completed. No wiring is in place yet.
October 2009: SEM
A scanning electron microscope (SEM) was donated to the Physics Department at the end of the summer. With this addition, the Physics department now has the complete suite of microscopes necessary for nanotechnology work (SEM, AFM, and STM). The SEM has been used in several labs already this year. The inset image at the upper left is of a penny. The stamp date of 1989 is magnified 150 times so we can see the first 9. The right inset image is of one edge of the 9 magnified 5000 times.
August 2009: Summer Projects
Four physics majors worked on projects for the Physics Department during the summer. Jeremy and Jeff stand next to a demonstration built to test a Classical Mechanics Problem.
Last update on March 21, 2014