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.
THYBB5
RadiaBeam, Santa Monica, California, USA
SLAC, Menlo Park, California, USA
RadiaBeam Systems, Santa Monica, California, USA
MIT/PSFC, Cambridge, Massachusetts, USA
MIT, Cambridge, Massachusetts, USA
The development of novel mm-wave accelerating structures with > 200 MV/m gradients offers a promising path to reduce the cost and footprint of future TeV-scale linear colliders, as well as linacs for industrial, medical and security applications. The major factor limiting accelerating gradient is vacuum RF breakdown. The probability of such breakdowns increases with pulse length. For reliable operation, millimeter-wave structures require nanoseconds long pulses at the megawatt level. This power is available from gyrotrons, which have a minimum pulse length on the order of microseconds. In this paper, we will describe the laser-based RF switch capable of selecting 10 ns long pulses out of the microseconds long gyrotron pulses, thus enabling the use of the gyrotrons as power sources for mm-wave high gradient linac. The principle of operation of this device and its achieved parameters will be discussed. We will also report on the experimental demonstration of the RF switch with the high power gyrotron at the Massachusetts Institute of Technology.