Courtney Knaup Emporia State University REU 2007 Cyclotron Institute, Texas A&M University Advisor: Dr. Henry Clark Upon completion of the recommissioning project, the Cyclotron Institute can expand the Radiation Effects Facility (REF) program by adding a dedicated beam line and experimental cave on the K150 cyclotron. The beam line layout, testing station and radiation shielding walls have been designed. The computer code “Transport” was used to determine the number of electromagnets needed and their optimal positions along the beam line so that both defuse and focused beam spots can be produced at the target location. A list of ions at energies produced by the K150 cyclotron has been determined for the Single Event Effects (SEE) experimenters. The SEE experimenters require a wide variety of ions and energies in order to effectively test their computer chips. The curve in the figure above shows the maximum E/A as a function of Q/M for the K150 cyclotron. To reduce tuning time between ion changes, sets of ions at similar Q/M ratios have been determined. The design of the experimental area allows plenty of room for work space, radiation shielding, and an entrance labyrinth which allows for easy access and the containment of secondary radiation produced by the beam. Due to space limitations, an "all in one" in-air/vacuum chamber testing station has been re-designed. The K500 REF beam line uses two separate areas; one for in-air testing and one for vacuum testing. the new design allows the beam line to be much shorter while not compromising its usefulness. Beam is transported along the beam line from the K150 cyclotron. The quadrupole magnet pairs focus and/or defocus the beam and the dipole magnet bends the beam into the experimental area. The computer code “Transport” was used to determine the optimal positions for quadrupole magnet pairs 2, 3 and 4. The magnetic fields of the quadrupole magnet pairs can be set so that the beam spot at the testing station is either diffuse or focused. The diagrams above show the phase space of the beam along the beam path for a diffuse beam spot scenario. This structure is required for the SEE experiments and ensures that their computer chips are uniformly irradiated. Computer chips in aerospace equipment receive high levels of radiation from solar flares, cosmic rays and the Earth's Van Allen radiation belts. The performance of these chips can be tested with the accelerated beams from the K150 cyclotron which are similar in ion type and close to the energies experienced in space. Aerospace engineers plot the number of upsets as a function of LET to understand how well their computer chips will respond in the radiation fields of the earth. Upset cross sections tend to follow the pattern shown in the figure above which includes three parts: the threshold, knee and saturation regions. With ions having range of ~100 microns and LET up to ~60 MeV/mg/cm2, engineers can test "In-air" and up to LETs into the saturation region with the K150 accelerated beams. The charts above show the linear energy transfer (LET) as a function of range for ions accelerated to 5, 14, and 25A MeV/nucleon. The 14 and 25 MeV/nucleon ions have enough energy to allow experimenters to test in air.