We have measured the first state-resolved, absolute cross sections for positron excitation of electronic states of an atom or molecule using a high resolution (Delta E approximately 25 meV FWHM) beam of positrons from a Penning-Malmberg trap. We present cross sections for the excitation of the low-lying levels of Ar, H(2), and N(2) for incident positron energies between threshold and 30 eV. For...

studying gaussian beam is a method to investigate laser beam propagation and abcd matrix is a fast and simple method to simulate gaussian beam propagation in different mediums. of the abcd matrices studied so far, reflection and refraction matrices at various surfaces have attracted a lot of researches. however in previous work the incident beam and the principle axis of surface are in parallel...

High-power free electron lasers (FEL’s) can be realized using induction linear accelerators as the source of the electron beam. These accelerators are currently capable of producing intense cwrents (102-104 A) at moderately high energy (1-50 MeV). Experiments using a 500 A, 3.3 MeV beam have produced 80 MW of radiation at 34.6 GHz and are in good agreement with theoretical analysis. Future expe...

In a collaborative effort with industry and several national laboratories, the Accelerator Production of Tritium (APT) facility and the Spallation Neutron Source (SNS) linac are presently being designed and developed at Los Alamos National Laboratory (LANL). The APT facility is planned to accelerate a 100 mA H cw beam to 1.7 GeV and the SNS linac is planned to accelerate a 1 to 4 mA-average, H,...

background: two protocols of aapm tg-51 and iaea trs-398 were compared followed by a measurement and monte carlo simulation of beam quality correction factor, kq, aapm tg-51 and iaea trs-398 protocols were compared for the absorbed dose to water for dw, and kq parameters. materials and methods: dose measurements by either protocols were performed with cylindrical and plane parallel chambers for...

A high power proton accelerator project, Proton Engineering Frontier Project (PEFP), as one of the 21C Frontier Projects promoted by Korean Government, has the goals to develop a 100 MeV high current proton linear accelerator and the user programs for its beam utilization and industrial applications. The upstream part of the 100 MeV linac, the 20 MeV linac, was successfully developed and tested...

In this work, we measured the time evolution of the transmission features of 10-100 keV protons transmitted through nanocapillaries in a polycarbonate (PC) membrane. After reaching equilibrium, transmitted particles with an incident energy of 100 keV were located around the direction along the incident beam but not along the capillary axis, indicating that the transport mechanism of the 100 keV...

Non-invasive beam monitoring tools are required to guarantee the delivered dose during ion irradiation. Measuring bremsstrahlung X-rays emitted directly from irradiated medium is a promising approach. This work presents feasibility of method for different incident particles with energies. A PMMA target was bombarded helium ions 68 MeV and protons beams 30, 40, 50 MeV. The signal, measured SDD, ...

The new Oslo Scintillator Array (OSCAR) has been commissioned at the Cyclotron Laboratory (OCL). It consists of 30 large volume (diameter 3.5 x 8 inches) LaBr$_3$(Ce) detectors that are used for $\gamma$-ray spectroscopy. response functions incident $\gamma$-rays up to 20 MeV simulated with $\texttt{Geant4}$. In addition, resolution, and total full-energy peak efficiencies extracted. results in...

Projectile photon coincidences were measured for the scattering of an 80 MeV/nucleon 64Zn beam from *‘*Pb and *“Bi targets at the GANIL heavy ion accelerator facility. Projectile-like particles between 0.5” and 4.5“ relative to the incident beam direction were detected in the SPEG energy loss spectrometer where their momentum, charge, and mass were determined. Photons were detected in the BaF2 ...