Author: Hardin, C.L.
Paper Title Page
THOPMA05
 Using Resistive Element Adjustable Length (REAL) Cooling to Increase Optical Design Flexibility in High Power XFELS  
 
  • C.L. Hardin, D. Cocco, L. Lee, D.S. Morton, M.L. Ng, L. Zhang
    SLAC, Menlo Park, California, USA
  
  With the onset of high power XFELs and diffraction limited storage rings, there is a growing demand to maintain sub nanometer mirror figures even under high heat load. This is a difficult issue as the optimum cooling design for an optic is highly dependent on the power footprint on the mirror, which can be highly dynamic. Resistive Element Adjustable Length cooling can be utilized to change the cooling parameters during an experiment to adapt for changing beam parameters. A case study of the new soft x-ray monochromator for the LCLS L2SI program is presented that utilizes this new capability to allow the beam to translate across the mirror for different operation modes, greatly simplifying the monochromator mechanics.  
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THPH34
 Design & Validation of Adaptive Bendable Mirrors for the LCLS-II Soft X-Ray Beam Lines  
 
  • D.S. Morton, D. Cocco, C.L. Hardin, L. Zhang
    SLAC, Menlo Park, California, USA
  
  Funding: SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515.
One of the key components of the photon beam transport system, in the LCLS-II SXR beamlines is the bendable focusing mirror system. For the first time in the Synchrotron or FEL beamlines, the large bending needed to focus the beam will be coupled with a direct cooling system, since almost the entire FEL power is de-livered through the optics to the sample. While cooling and bending the mirror, height errors shall be preserved below one nanometer RMS, to not distort the wavefront of the coherent FEL beam. This has required an extensive study of the mechanical properties of the thermal interface material, Gallium Indium (GaIn). Aside from the challenges introduced by the cooling, the mechanical requirements of the bender have resulted in an extensive design effort. This effort has yielded a prototype system that has been tested to validate our design decisions, and the FEA models of the system. In this paper, the key design elements of the bendable mirror system will be reviewed. We then discuss FEA models of the system and the expected performance. This is followed by results from laboratory tests and comparison to simulations. We finalize with the design changes and future work. 		 
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THPH36 Engineering Challenges for the NEH2.2 Beamline at LCLS-II 409
 
  • F.P. O'Dowd, D. Cocco, G.L. Dakovski, J. Defever, S. Guillet, C.L. Hardin, D.S. Morton, T.O. Osier, M.A. Owens, D.W. Rich, L. Zhang
    SLAC, Menlo Park, California, USA
  
  SLAC National Accelerator Laboratory is developing LCLS-II, a superconducting linear accelerator based FEL capable of repetition rates up to 1MHz. The NEH2.2 Instrument at LCLS-II will use this combination of exceptionally high flux of monochromatic photons to achieve multidimensional and coherent X-ray techniques that are possible only with X-ray lasers. The challenges, which emanate from delivering the beam from the sub-basement level to the basement of the Near Experimental Hall (NEH) along with the stringent requirements for providing a stable beam at the interaction points, necessitate unique engineering solutions. With this paper we present the conceptual design for the NEH2.2 Instrument along with an overview of the R&D program required to validate design performance. Furthermore, it will additionally show the design of the proposed Liquid Jet Endstation (LJE) and Resonant Inelastic X-Ray Scattering Endstation (RIXS) that will be installed on the beamline. After introducing the context and layout of the beamline, this paper will focus on the technical challenges and present the mechanical design solutions adopted for beam delivery and other strategic components.  
poster icon Poster THPH36 [2.220 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2018-THPH36  
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