• S. Boucher, P. Frigola, A.Y. Murokh
  RadiaBeam, Marina del Rey
• I. Jovanovic
  Purdue University, West Lafayette, Indiana
• J.B. Rosenzweig, G. Travish
  UCLA, Los Angeles, California

Funding: This work is supported by the US Defense Threat Reduction Agency SBIR contract HDTRA1-08-P-0035.

Conventional X-ray sources used for medical and industrial imaging suffer from low spectral brightness, a factor which severely limits the image quality that can be obtained. X-ray sources based on Inverse Compton Scattering (ICS) hold promise to greatly improve the brightness of X-ray sources. While ICS sources have previously been demonstrated, and have produced high-peak brightness X-rays, so far experiments have produced low average flux, which limits their use for certain important commercial applications (e.g. medical imaging). RadiaBeam Technologies is currently developing a high peak- and average-brightness ICS source, which implements a number of improvements to increase the interaction repetition rate, as well as the efficiency and stability of the ICS interaction itself. In this paper, we will describe these improvements, as well as plans for future experiments.

• S. Boucher, R.B. Agustsson, P. Frigola, A.Y. Murokh, M. Ruelas
  RadiaBeam, Marina del Rey
• F.H. O'Shea, J.B. Rosenzweig, G. Travish
  UCLA, Los Angeles, California

The fixed-field alternating-gradient (FFAG) betatron has emerged as a viable alternative to RF linacs as a source of high-energy radiation for industrial and security applications. RadiaBeam Technologies is currently developing an FFAG betatron with a novel induction core made with modern low-loss magnetic materials. The principle challenge in the project has been the design of the magnets. In this paper, we present the current status of the project, including results of the magnet design and testing.

• P. Frigola, R.B. Agustsson, S. Boucher, A.Y. Murokh
  RadiaBeam, Marina del Rey
• H. Badakov, A. Fukasawa, P. Musumeci, J.B. Rosenzweig, G. Travish
  UCLA, Los Angeles, California
• D. Cormier, T. Mahale
  NCSU, Raleigh, North Carolina
• L. Faillace
  INFN/LNF, Frascati (Roma)

Electron beam based additive fabrication techniques have been successfully applied to produce a variety of complex, fully dense, metal structures. These methods, collectively known as Solid Freeform Fabrication (SFF) are now being explored for use in radio frequency (RF) structures. SFF technology may make it possible to design and produce near-netshape copper structures for the next generation of very high duty factor, high gradient RF photoinjectors. The SFF process discussed here, Arcam Electron Beam Melting (EBM), utilizes an electron beam to melt metal powder in a layer-by-layer fashion. The additive nature of the SFF process and its ability to produce fully dense parts are explored for the fabrication of internal cooling passages in RF photoinjectors. Following an initial feasibility study of the SFF process, we have fabricated a copper photocathode, suitable as a drop-in replacement for the UCLA 1.6 cell photoinjector, with internal cooling channels using SFF. Material analysis of the prototype cathode and new designs for a high duty factor photoinjector utilizing SFF technology will be presented.

• G. Andonian, S. Boucher, A.Y. Murokh, M. Ruelas
  RadiaBeam, Marina del Rey
• D. Dooley, S. Levingston, M. Stout
  Spectrum Detector, Lake Oswego, Oregon
• U. Happek
  UGA, Athens, Georgia
• G. Travish
  UCLA, Los Angeles, California

Funding: Work supported by U.S. DOE Grant Number DE-FG02-07ER84814.

The generation of high peak current, high brightness beams routinely requires compression methods (e.g. four-bend chicane), which produce coherent radiation as a by-product. The sensing of this radiation, coupled with interferometric methods, yields crucial longitudinal bunch length and bunch profile information. This paper discusses the progress of the development of a real-time terahertz interferometer used for longitudinal beam profile diagnosis.

• S. Boucher, P. Frigola
  RadiaBeam, Marina del Rey
• E.R. Arab, G. Travish, N. Vartanian
  UCLA, Los Angeles, California
• R.B. Yoder
  Manhattanville College, Purchase, NY

Funding: This project is supported by DOE SBIR Grant DE-FG02-08ER85038.

Laser-powered dielectric accelerating structures, which have attracted attention in recent years, trade fabrication challenges and extremely small beam apertures for the promise of high gradients and new bunch formats. The slab-symmetric, periodically-coupledμAccelerator Platform (MAP) is one such dielectric accelerator, and has been under development through a RadiaBeam-UCLA collaboration for several years. Intended applications of the structure include the production of radiation for medical treatments, imaging, and industrial uses. Prototype MAP structures are now being fabricated, and a program has been undertaken to test this device using externally injected electron beams. Plans are underway to install structures in the E163 facility at SLAC. In this paper we describe the testing methods, diagnostics and expectations. Progress and results to date are also presented.