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MOOBNO02 |
FEL Operation With the Superconducting RF Photo Gun at ELBE | |
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| The superconducting RF photoinjector (SRF gun) operating with a 31/2-cell niobium cavity and Cs2Te photocathodes is installed at the ELBE radiation center. The gun provides beams for ELBE as well as in a separate diagnostics beam line for beam parameter measurements. Since 2012 a new UV driver laser system developed by MBI has been installed for the SRF gun . It delivers CW or bust mode pulses with 13 MHz repetition rate or with reduced rates of 500, 200, and 100 kHz at an average UV power of about 1 W. The new laser allows the gun to serve as the driver for the infrared FELs at ELBE. In the first successful experiment a 250 μA beam with 3.3 MeV from SRF gun was injected into ELBE, further accelerated in the ELBE superconducting linac modules and then guided to the U100 undulator. First lasing was achieved at the wavelength of 41 μm. The spectrum, detuning curve and further parameters were measured. | ||
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Slides MOOBNO02 [7.458 MB] | |
MOOBNO04 |
First Light from the ELBE THz Radiation Facility | |
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| A new super-radiant THz source has successfully been put into operation at the ELBE radiation source. The facility combines a broad-band transition or diffraction radiation source with an 8 period undulator. Both sources are inherently synchronized by generating radiation from the same electron bunch. This, together with the possibility to operate the machine in CW with repetition rates of 100kHz to 13MHz makes the new source a very versatile tool for a broad range of experiments, particularly for THz based electron bunch diagnostics. With the low beam energy (our first experiments were done at 28 MeV) the bunch compression becomes a major challenge. We have generated coherent radiation with wavelengths as short as 200 microns indicating a compression of a major fraction of the bunch into a pulse with 200 fs bunchlength. Our design target is a compression down to 100 fs and to reach 100 micron wavelength (3THz). | ||
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Slides MOOBNO04 [3.602 MB] | |
| MOPSO76 | FEL Operation With the Superconducting RF Photo Gun at ELBE | 136 |
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| The superconducting RF photoinjector (SRF gun) operating with a 31/2-cell niobium cavity and Cs2Te photocathodes is installed at the ELBE radiation center. The gun provides beams for ELBE as well as in a separate diagnostics beam line for beam parameter measurements. Since 2012 a new UV driver laser system developed by MBI has been installed for the SRF gun . It delivers CW or bust mode pulses with 13 MHz repetition rate or with reduced rates of 500, 200, and 100 kHz at an average UV power of about 1 W. The new laser allows the gun to serve as the driver for the infrared FELs at ELBE. In the first successful experiment a 250 μA beam with 3.3 MeV from SRF gun was injected into ELBE, further accelerated in the ELBE superconducting linac modules and then guided to the U100 undulator. First lasing was achieved at the wavelength of 41 μm. The spectrum, detuning curve and further parameters were measured. | ||
| WEPSO62 | The IR and THz Free Electron Laser at the Fritz-Haber-Institut | 657 |
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A mid-infrared oscillator FEL with a design wavelength range from 4 to 50 μm has been commissioned at the Fritz-Haber-Institut in Berlin, Germany, for applications in molecular and cluster spectroscopy as well as surface science. The accelerator consists of a thermionic gridded electron gun, a subharmonic buncher and two S-band standing-wave copper structures. The device 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 π mm-mrad), at more than 200 pC bunch charge with aμpulse repetition rate of 1 GHz and a macro pulse length of up to 15 μs. Two isochronous achromatic 180 degree bends deliver the beam to the undulators, only one of which is presently installed, and to the beam dumps. Calculations of the FEL gain and IR-cavity losses predict that lasing will be possible in the wavelength range from less than 4 to more than 50 μm. First lasing was achieved at a wavelength of 16 μm in 2012*. We will describe the FEL system design and performance, provide examples of lasing, and touch on the first anticipated user experiments.
* W. Schöllkopf et al., MOOB01, Proc. FEL 2012. |
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