Author: Adolphsen, C.
Paper Title Page
WEOAA1
 NGLS - A Next Generation Light Source  
 
  • J.N. Corlett, A.P. Allezy, D. Arbelaez, J.M. Byrd, C.S. Daniels, S. De Santis, W.W. Delp, P. Denes, R.J. Donahue, L.R. Doolittle, P. Emma, D. Filippetto, J.G. Floyd, J.P. Harkins, G. Huang, J.-Y. Jung, D. Li, T.P. Lou, T.H. Luo, G. Marcus, M.T. Monroy, H. Nishimura, H.A. Padmore, C. F. Papadopoulos, G.C. Pappas, S. Paret, G. Penn, M. Placidi, S. Prestemon, D. Prosnitz, H.J. Qian, J. Qiang, A. Ratti, M.W. Reinsch, D. Robin, F. Sannibale, R.W. Schoenlein, C. Serrano, J.W. Staples, C. Steier, C. Sun, M. Venturini, W.L. Waldron, W. Wan, T. Warwick, R.P. Wells, R.B. Wilcox, S. Zimmermann, M.S. Zolotorev
    LBNL, Berkeley, California, USA
  • C. Adolphsen, K.L.F. Bane, Y. Ding, Z. Huang, C.D. Nantista, C.-K. Ng, H.-D. Nuhn, C.H. Rivetta, G.V. Stupakov
    SLAC, Menlo Park, California, USA
  • D. Arenius, G. Neil, T. Powers, J.P. Preble
    JLAB, Newport News, Virginia, USA
  • C.M. Ginsburg, R.D. Kephart, A.L. Klebaner, T.J. Peterson, A.I. Sukhanov
    Fermilab, Batavia, USA
  
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
We present an overview of design studies and R&D toward NGLS – a Next Generation Light Source initiative at LBNL. The design concept is based on a multi-beamline soft x-ray FEL array powered by a CW superconducting linear accelerator, and operating with a high bunch repetition rate of approximately 1 MHz. The linac design uses TESLA and ILC technology, supplied by an injector based on a CW normal-conducting VHF photocathode electron gun. Electron bunches from the linac are distributed by RF deflecting cavities to the array of independently configurable FEL beamlines with nominal bunch rates of ~100 kHz in each FEL, with uniform pulse spacing, and some FELs capable of operating at the full linac bunch rate. Individual FELs may be configured for different modes of operation, including self-seeded and external-laser-seeded, and each may produce high peak and average brightness x-rays with a flexible pulse format. 		 
slides icon Slides WEOAA1 [6.908 MB]  
 
WEOBA1
 Initial X-band Photoinjector Performance at SLAC  
 
  • C. Limborg-Deprey, C. Adolphsen, M.P. Dunning, C. Hast, R.K. Jobe, H. Li, T.J. Maxwell, D.J. McCormick, T.O. Raubenheimer, S.P. Weathersby
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515
The X-Band Test Area (XTA) at SLAC is an all X-Band compact RF photoinjector that can produce short, high current electron bunches. Computations have shown that the peak bunch brightness should exceed that from S-Band RF photoinjectors by a factor of four. This improved performance principally comes from the high (200 MV/m) peak fields that can be sustained on the gun cathode. During the first three months of XTA commissioning, 20 pC electron bunches have been routinely generated with the gun cathode operating at greater than 200 MV/m while the dark current levels have been low. The electron bunches are accelerated to 70 MeV in a one-meter long, travelling-wave, X-band structure after the gun (a newer version of this structure should allow acceleration to more than 100 MeV). This paper reviews progress to date including measurements of the bunch properties and the bunch-to-bunch stability. The lengths of the 20 pC bunches have been measured with a transverse X-Band deflection cavity to be 250 fs rms, as expected from simulations. Transverse emittance in the range of 0.9 mm-mrad have been measured. A path to reach expected low transverse emittance numbers is described. 		 
slides icon Slides WEOBA1 [2.840 MB]  
 
WEPHO10 X-Band RF Power Generation via an L-Band Accelerator System and Uses 951
 
  • N. Sipahi, S. Biedron, S.V. Milton, T. Sipahi
    CSU, Fort Collins, Colorado, USA
  • C. Adolphsen
    SLAC, Menlo Park, California, USA
  
  The development of compact, cost effective sources of high-energy electron beams is a major thrust of the Colorado State University Accelerator Laboratory team. In this paper we describe a way to generate usable X-Band RF power suitable for powering an X-Band accelerating structure to overall potentials significantly higher than what we are presently able to obtain from our L-Band photocathode RF gun system. The concept relies on the use of the L-band accelerator beam to generate the X-band power that is then delivered to a suitable X-band structure. Once powered this X-band structure can be used to accelerate an electron bunch to high beam energies.  
 
WEPMA10 Passively Driven X-band RF Linac Structure 1001
 
  • T. Sipahi, S. Biedron, S.V. Milton, N. Sipahi
    CSU, Fort Collins, Colorado, USA
  • C. Adolphsen
    SLAC, Menlo Park, California, USA
  
  Accelerating structures operated at X-band frequencies have been shown to regularly achieve gradients of around 100 MV/m or better. Obviously, use of such technology can lead to more compact particle accelerators. At the Colorado State University Accelerator Laboratory we would like to adapt this technology to our L-band (1.3 GHz) accelerator system via a 2-beam configuration that capitalizes on the high gradients achievable in X-band accelerating structures in order to increase our overall beam energy in a manner that does not require investment in an expensive, custom, high-power X-band klystron system. A novel configuration has been proposed. Here we provide the design details of the X-band accelerator system that will allow us to achieve our goal of reaching the maximum practical net potential across the X-band accelerating structure.