FEL2012 - List of Authors (Dowell, D.)

Paper

Title

Page

First Lasing of the IR FEL at the Fritz-Haber-Institut Berlin

1

W. Schöllkopf, W. Erlebach, S. Gewinner, G. Heyne, H. Junkes, A. Liedke, G. Meijer, V. Platschkowski, W.Q. Zhang, G. von Helden
FHI, Berlin, Germany
H. Bluem, D. Dowell, K. Jordan, R. Lange, J.H. Park, J. Rathke, A.M.M. Todd, L.M. Young
AES, Medford, NY, USA
M.A. Davidsaver
BNL, Upton, New York, USA
S.C. Gottschalk
STI, Washington, USA
U. Lehnert, P. Michel, W. Seidel, R. Wünsch
HZDR, Dresden, Germany
H. Loos
SLAC, Menlo Park, California, USA

An IR and THz FEL with a design wavelength range from 4 to 500 μm has been commissioned at the Fritz-Haber-Institut (FHI) in Berlin, Germany, for applications in, i.a., molecular and cluster spectroscopy as well as surface science.[1] The linac[2] comprises two S-band standing-wave copper structures. The first one operates at near fixed field to accelerate the electrons to 20 MeV, while the second one is designed to accelerate (or decelerate) to any final energy between 15 and 50 MeV. A key aspect of the system is low longitudinal emittance, <50 keV-psec, at more than 200 pC bunch charge with a max.μpulse rep. rate of 1 GHz. The up to 15 μs long macro pulses come at a rate of up to 20 Hz. The electrons are steered through either one of two FELs. A single-plane-focusing, 40 mm period wedged-pole hybrid undulator[3] combined with a 5.4 m long cavity has been commissioned for the mid-IR (<50 μm). In addition, a two-plane-focusing undulator in combination with a 7.2 m long cavity with a 1-d waveguide for the optical mode is planned for the far-IR. In February 2012 we observed 'first lasing' at 28 MeV and 18 μm wavelength. We will present first results characterizing the system.
[1] W. Schöllkopf et al., "Status of the Fritz Haber Institute THz FEL", Paper TUPB30, Proc. FEL 2011.
[2] Advanced Energy Systems, Inc., Medford, NY, USA
[3] STI Optronics, Inc., Bellevue, WA, USA

Slides MOOB01 [3.440 MB]

WEOC04

Accelerator Beamline Performance for the IR FEL at the Fritz-Haber-Institut, Berlin

365

H. Bluem, D. Dowell, J.H. Park, A.M.M. Todd, L.M. Young
AES, Medford, NY, USA
S. Gewinner, W. Schöllkopf
FHI, Berlin, Germany
H. Loos
SLAC, Menlo Park, California, USA

An electron accelerator and beamline for an IR and THz FEL with a design wavelength range from 4 to 500 μm has been commissioned by Advanced Energy Systems at the Fritz-Haber-Institut (FHI) in Berlin, Germany, for applications in, i.a., molecular and cluster spectroscopy as well as surface science. The linac comprises two S-band standing-wave copper structures and was designed to meet challenging specifications, including a final energy adjustable in the range of 15 to 50 MeV, low longitudinal emittance (<50 keV-psec) and transverse emittance (<20 μm), at more than 200 pC bunch charge with aμpulse repetition rate of 1 GHz. First lasing was achieved February 2012. Operational experience and measured electron beam performance will be presented.

Slides WEOC04 [12.785 MB]

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
MOOB01	First Lasing of the IR FEL at the Fritz-Haber-Institut Berlin	1
	W. Schöllkopf, W. Erlebach, S. Gewinner, G. Heyne, H. Junkes, A. Liedke, G. Meijer, V. Platschkowski, W.Q. Zhang, G. von Helden FHI, Berlin, Germany H. Bluem, D. Dowell, K. Jordan, R. Lange, J.H. Park, J. Rathke, A.M.M. Todd, L.M. Young AES, Medford, NY, USA M.A. Davidsaver BNL, Upton, New York, USA S.C. Gottschalk STI, Washington, USA U. Lehnert, P. Michel, W. Seidel, R. Wünsch HZDR, Dresden, Germany H. Loos SLAC, Menlo Park, California, USA
	An IR and THz FEL with a design wavelength range from 4 to 500 μm has been commissioned at the Fritz-Haber-Institut (FHI) in Berlin, Germany, for applications in, i.a., molecular and cluster spectroscopy as well as surface science.[1] The linac[2] comprises two S-band standing-wave copper structures. The first one operates at near fixed field to accelerate the electrons to 20 MeV, while the second one is designed to accelerate (or decelerate) to any final energy between 15 and 50 MeV. A key aspect of the system is low longitudinal emittance, <50 keV-psec, at more than 200 pC bunch charge with a max.μpulse rep. rate of 1 GHz. The up to 15 μs long macro pulses come at a rate of up to 20 Hz. The electrons are steered through either one of two FELs. A single-plane-focusing, 40 mm period wedged-pole hybrid undulator[3] combined with a 5.4 m long cavity has been commissioned for the mid-IR (<50 μm). In addition, a two-plane-focusing undulator in combination with a 7.2 m long cavity with a 1-d waveguide for the optical mode is planned for the far-IR. In February 2012 we observed 'first lasing' at 28 MeV and 18 μm wavelength. We will present first results characterizing the system. [1] W. Schöllkopf et al., "Status of the Fritz Haber Institute THz FEL", Paper TUPB30, Proc. FEL 2011. [2] Advanced Energy Systems, Inc., Medford, NY, USA [3] STI Optronics, Inc., Bellevue, WA, USA
	Slides MOOB01 [3.440 MB]

WEOC04	Accelerator Beamline Performance for the IR FEL at the Fritz-Haber-Institut, Berlin	365
	H. Bluem, D. Dowell, J.H. Park, A.M.M. Todd, L.M. Young AES, Medford, NY, USA S. Gewinner, W. Schöllkopf FHI, Berlin, Germany H. Loos SLAC, Menlo Park, California, USA
	An electron accelerator and beamline for an IR and THz FEL with a design wavelength range from 4 to 500 μm has been commissioned by Advanced Energy Systems at the Fritz-Haber-Institut (FHI) in Berlin, Germany, for applications in, i.a., molecular and cluster spectroscopy as well as surface science. The linac comprises two S-band standing-wave copper structures and was designed to meet challenging specifications, including a final energy adjustable in the range of 15 to 50 MeV, low longitudinal emittance (<50 keV-psec) and transverse emittance (<20 μm), at more than 200 pC bunch charge with aμpulse repetition rate of 1 GHz. First lasing was achieved February 2012. Operational experience and measured electron beam performance will be presented.
	Slides WEOC04 [12.785 MB]

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