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Popovic, Milorad

Publications and source records attributed to Popovic, Milorad.

11 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2024

Simulation study of ion beam used to produce Mo-99

An 820 mA CW positive ion source is being developed to produce Mo-99 using the fusion of deuterium and tritium ion beams on a rotating target to produce neutrons for use in the production of radiopharmaceuticals. The ion source consists of an RF plasma source, a multi-aperture extractor, and 300 kV accelerating column. This paper will describe a simulation study of the beam through the extractor grid and the accelerator to the target. The uniformity of beam distribution on the target is an important aspect of the simulation.

43 PARTICLE ACCELERATORS↗
DOE OSTI2019

Development of a Beam Halo Monitor

Our innovative approach is to design the Beam Halo Monitor, where beam induced synchrotron radiation will be used to monitor the beam Halo. This involves an original scheme of light collection using a coronograph for measuring beam halo.

43 PARTICLE ACCELERATORS↗
DOE OSTI2012

RF cavity using liquid dielectric for tuning and cooling

A system for accelerating particles includes an RF cavity that contains a ferrite core and a liquid dielectric. Characteristics of the ferrite core and the liquid dielectric, among other factors, determine the resonant frequency of the RF cavity. The liquid dielectric is circulated to cool the ferrite core during the operation of the system.

47 OTHER INSTRUMENTATION↗
DOE OSTI2011

Status of MICE, the International Muon Ionization Cooling Experiment

Muon ionization cooling provides the only practical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. The muon ionization cooling experiment (MICE) is thus a strategic R&D project for neutrino physics. It is under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to generate a range of input emittance and momentum, with time-of-flight and Cherenkov detectors to ensure a pure muon beam. A first measurement of emittance is performed in the upstream magnetic spectrometer with a scintillating fiber tracker. A cooling cell will then follow, alternating energy loss in liquid hydrogen and RF acceleration. A second spectrometer identical to the first one and a particle identification system provide a measurement of the outgoing emittance. In the 2010 run, completed in August, the beam and most detectors have been fully commissioned. The time of the first measurement of input beam emittance is closely approaching. The plan of steps of measurements of emittance and emittance reduction (cooling), that will follow in 2011 and later, will be reported.

43 PARTICLE ACCELERATORS↗
DOE OSTI2010

Dielectric Loaded RF Cavities for Muon Facilities

This paper discusses RF cavities loaded with dielectric material that may be used at various stages of muon collection, cooling and accelerations for Neutrino Factories and muon collider facilities. Most of the existing pill-box cavity designs are too large in diameter to fit efficiently in the current cooling lattice designs. The paper describes progress in novel compact dielectric loaded RF cavities designs that fit efficiently in muon cooling lattices and allow multi-frequency cavity designs in the same size cavity by changing the dielectric constant or size. The paper describes the designs of 400 and 800 MHz cavities for the (HCC) helical cooling channel. In addition to the use of the dielectric to reduce the radial size of gas-filled cavities in helical cooling channels, dielectric-loading has the potential use in vacuum cavities for suppression of dark current emission. Cavities that can be used for the phase rotation channel in the front end of a muon collider or neutrino factory are also presented.

43 PARTICLE ACCELERATORS↗
DOE OSTI2010

Using Project X as a Proton Driver for Muon Colliders and Neutrino Factories

The designs of accelerator systems that will be needed to transform Fermilab's Project X [1-3] into a high-power proton driver for a muon collider and/or a neutrino factory are discussed. These applications require several megawatts of beam power delivered in tens or hundreds of short multi-GeV bunches per second, respectively. Project X may require a linac extension to higher energy for this purpose. Other major subsystems that are likely to be needed include storage rings to accumulate and shorten the proton bunches and an external beam combiner to deliver multiple bunches simultaneously to the pion production target.

43 PARTICLE ACCELERATORS↗
DOE OSTI2010

High Power SRF Linacs for ADS Reactors

We discuss plans to develop Accelerator-Driven Subcritical Reactor (ADSR) nuclear power stations producing more than 5 to 10 GWe in an inherently safe region below criticality, generating no greenhouse gases, producing minimal nuclear waste and no byproducts that are useful to rogue nations or terrorists, incinerating waste from conventional nuclear reactors, and efficiently using abundant thorium fuel that does not need enrichment. Fermilab is developing concepts for Project X [1], which would use a superconducting RF (SRF) linear proton accelerator to provide beams for particle physics at the intensity and energy frontiers. We propose to extend this linac design to serve as a prototype for a practical accelerator that can drive several nuclear reactors at once and also provide beams for reactor development. We also propose that a Recirculating Linear Accelerator be developed for ADSR applications by extrapolating from techniques developed for the CEBAF machine.

43 PARTICLE ACCELERATORS↗
DOE OSTI2010

Quasi-Monoenergetic Photon Source Based on Electron-Positron In-Flight Annihilation

We study electron-positron in-flight annihilation as a potential source of quasi-monoenergetic photon (or gamma-ray) beams. A high-intensity tunable-energy (1.5- 15 MeV) gamma source has many potential uses in medical, industrial and security applications. Several electron-positron collision geometries are considered: a) head-on; b) collinear; and c) positron beam incident on a fixed electron target. We analyze advantages of each of the geometries in order to optimize parameters of the generated gamma-ray beams.

43 PARTICLE ACCELERATORS↗
DOE OSTI2010

Compact, Tunable RF Cavities

Compact RF cavities that tune rapidly over various frequency ranges are being developed using an innovative design with orthogonally biased ferrite or garnet cores for fast frequency tuning and liquid dielectric to adjust the frequency range and to control the core temperature. We describe mathematical and physical models of RF cavities suitable for FFAG and other applications as well as first measurements of candidate ferrite and dielectric materials. The first uses of the new cavity concept will be for improvements to the 8 GeV Fermilab Booster synchrotron.

43 PARTICLE ACCELERATORS↗