FEL2012 - List of Authors (Valla, A.S.)

Paper	Title	Page
THPD13	Design and Performance of the Wedged Pole Hybrid Undulator for the Fritz-Haber-Institut IR FEL	575
	S.C. Gottschalk, T.E. DeHart, R.N. Kelly, M.A. Offenbacker, A.S. Valla, J.F. Zumdieck STI, Washington, USA H. Bluem, D. Dowell, J. Rathke, A.M.M. Todd AES, Medford, NY, USA S. Gewinner, H. Junkes, G. Meijer, W. Schöllkopf, W.Q. Zhang FHI, Berlin, Germany U. Lehnert HZDR, Dresden, Germany
	An IR and THz FEL with a design wavelength range from 4 to 500 microns has been commissioned at the Fritz-Haber-Institut (FHI) in Berlin, Germany. Lasing at 28 MeV and a wavelength of 18 micron was achieved in Feb 2012. We describe the performance of the undulator built and installed at FHI by STI Optronics for use in the mid-IR range (< 50 micron) and 15-50 MeV beam energy. The undulator was a high field strength wedged pole hybrid (WPH) with 40mm period, 2.0m long, minimum gap 16.5mm. A new improvement was including radiation resistance in the magnetic design. We will discuss the measured magnetic and mechanical performance; central and zero steering/offset end field magnetic designs; key features of the mechanical design and gap adjustment system; new genetic shimming algorithms and local/EPICS control systems. W.Schöllkopf et al., "First Lasing of the IR FEL at the Fritz-Haber-Institut Berlin", this conference

Paper

Title

Page

Design and Performance of the Wedged Pole Hybrid Undulator for the Fritz-Haber-Institut IR FEL

575

S.C. Gottschalk, T.E. DeHart, R.N. Kelly, M.A. Offenbacker, A.S. Valla, J.F. Zumdieck
STI, Washington, USA
H. Bluem, D. Dowell, J. Rathke, A.M.M. Todd
AES, Medford, NY, USA
S. Gewinner, H. Junkes, G. Meijer, W. Schöllkopf, W.Q. Zhang
FHI, Berlin, Germany
U. Lehnert
HZDR, Dresden, Germany

An IR and THz FEL with a design wavelength range from 4 to 500 microns has been commissioned at the Fritz-Haber-Institut (FHI) in Berlin, Germany. Lasing at 28 MeV and a wavelength of 18 micron was achieved in Feb 2012*. We describe the performance of the undulator built and installed at FHI by STI Optronics for use in the mid-IR range (< 50 micron) and 15-50 MeV beam energy. The undulator was a high field strength wedged pole hybrid (WPH) with 40mm period, 2.0m long, minimum gap 16.5mm. A new improvement was including radiation resistance in the magnetic design. We will discuss the measured magnetic and mechanical performance; central and zero steering/offset end field magnetic designs; key features of the mechanical design and gap adjustment system; new genetic shimming algorithms and local/EPICS control systems.
*W.Schöllkopf et al., "First Lasing of the IR FEL at the Fritz-Haber-Institut Berlin", this conference