RadiaBeam, Marina del Rey, California, USA
ANL, Lemont, Illinois, USA
UCLA, Los Angeles, USA
RadiaBeam, in collaboration with UCLA and Argonne National Laboratory (ANL), is developing a strongly tapered helical undulator system for the Tapering Enhanced Stimulated Superradiant Amplification experiment at 266 nm (TESSA-266). The experiment will be carried out at the APS LEA facility at ANL and aims at the demonstration of very high energy conversion efficiency in the UV. The undulator system was designed by UCLA, engineered by RadiaBeam, and is presently in fabrication at RadiaBeam. The design is based on a permanent magnet Halbach scheme and includes a short 30 cm long buncher section and four 1 m long undulator sections. The undulator period is fixed at 32 mm and the magnetic field amplitude can be tapered by tuning the gap along the interaction. Each magnet can be individually adjusted by 1.03 mm, offering up to 25% magnetic field tunability with a minimum gap of 5.58 mm. A custom designed 316L stainless steel beampipe runs through the center with a clear aperture of 4.5 mm. This paper discusses the design and engineering of the undulator system, fabrication status, and plans for magnetic measurements, and tuning.
RadiaBeam, Santa Monica, California, USA
ANL, Lemont, Illinois, USA
RadiaBeam, Santa Monica, California, USA
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
The Advanced Gradient Undulator (AGU) represents a potentially significant advancement in x-ray conversion efficiency for x-ray FELs. This increase in efficiency would have broad implications on the capabilities of x-ray light sources. To achieve this high conversion efficiency, the inner diameter of the undulator coil is a mere 7mm, even with the use of superconducting coils. To accommodate the beamline at the Advanced Photon Source this yields in a chamber with a wall thickness of 0.5mm fabricated from Aluminum. With a period of 2cm and a conductor position tolerance of <100 µm over a length of >80cm at 4.2K, the engineering and fabrication challenges for the undulator alone are substantial. We will discuss these fabrication challenges and present solutions to meet the tolerances required for desired performance, and provide an update on current progress of the construction of a section of the AGU insertion device.
WEZBB3
RadiaBeam, Santa Monica, California, USA
The US and IAEA authorities have identified as a priority the replacement of radioactive sources with alternative technologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices. In particular, enrichment plants that represent one of the most sensitive parts of the nuclear fuel cycle, use the Co-57 based Cascade Header Enrichment Monitor (CHEM) to detect the presence of UF6 gas at low pressures and to determine whether it is highly enriched. RadiaBeam has developed an inexpensive, hand-portable 180 keV Ku-band electron accelerator to replace Co-57 radionuclide source in CHEM detectors. We used an innovative split accelerating structure approacg to design the linac in two halves and to avoid labor-intensive tuning steps. In this paper, we will discuss the accelerator, including X-ray convertor and accelerating structure design. The results of RF measurements of a Ku-band split structure will also be reviewed. Other applications of Ku-band linacs include compact both backscatter- and transmission- X-ray inspection systems, as well as computed tomography for luggage and parcel screening with or without modulated energy pulses.