Jefferson Lab. FEL user facility

Shinn, Michelle D.; Benson, Stephen; Biallas, George; Bohn, C.L.; Douglas, D.; Dylla, H. F.; Evans, Richard A.; Fugitt, J.; Gubeli, J.; Hill, Richard A.; Jordan, Kevin; Krafft, Geoffrey; Li, Rui; Merminga, L.; Neil, George; Oepts, D.; Piot, P.; Preble, J.; Siggins, T.; Walker, R.; Yunn, B.

doi:10.1117/12.379347

Cited by 5 publications

(2 citation statements)

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“…We once again began providing light to users in 2005. Some of the unique features of this FEL, the User facility, and applications are contained in past proceedings of this and other conferences [1][2][3] When operating the FEL for users, one pays more attention to laser properties like output power and beam position stability than if beam delivery were into a dump a meter or two away. Commissioning activities become more than achieving a specified parameter for seconds or minutes, we need to maintain them simultaneously for hours.…”

Section: Introductionmentioning

confidence: 99%

Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser

et al. 2006

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The cavity optics within high power free-electron lasers based on energy-recovering accelerators are subjected to extreme conditions associated with illumination from a broad spectrum of radiation, often at high irradiances. This is especially true for the output coupler, where absorption of radiation by both the mirror substrate and coating places significant design restrictions to properly manage heat load and prevent mirror distortion. Besides the fundamental lasing wavelength, the mirrors are irradiated with light at harmonics of the fundamental, THz radiation generated by the bending magnets downstream of the wiggler, and x-rays produced when the electron beam strikes accelerator diagnostic components (e.g., wire scanners and view screens) or from inadvertent beam loss. The optics must reside within high vacuum at ~ 10 -8 Torr and this requirement introduces its own set of complications. This talk discusses the performance of numerous high reflector and output coupler optics assemblies and provides a detailed list of lessons learned gleaned from years of experience operating the Upgrade IR FEL, a 10 kW-class, sub-ps laser with output wavelength from 1 to 6 microns.

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Section: Introductionmentioning

confidence: 99%

Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser

et al. 2006

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“…Previous reports provide details about the FEL driver accelerator, the laser itself, and the facility so these topics will be touched on only briefly. 3,4 This paper concerns itself with the use of high average power (many tens of kilowatts) FELs built using the same technology as the IR Demo to do materials processing at scales that make these processes commercially viable. Some of these processes, such as pulsed laser deposition (PLD), are well known, but are currently unexploited, or have limited impact on markets, because of the limitations of the laser systems employed.…”

Section: Introductionmentioning

confidence: 99%

High-average-power free-electron lasers: a new laser source for materials processing

Shinn

2000

Proceedings of SPIE

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Material processing with lasers has grown greatly in the previous decade, with annual sales in excess of $1 B (US). In general, the processing consists of material removal steps such as drilling, cutting, as well as joining. Here lasers that are either cw or pulsed with pulsewidths in the µs time regime have done well. Some applications, such as the surface processing of polymers to improve look and feel, or treating metals to improve corrosion resistance, require the economical production of laser powers of the tens of kilowatts, and therefore are not yet commercial processes. The development of FELs based on superconducting RF (SRF) linac technology provides a scaleable path to laser outputs above 50 kW, rendering these applications economically viable, since the cost/photon drops as the output power increases. Such FELs will provide quasi-cw (PRFs in the tens of MHz), of ultrafast (pulsewidth ~ 1 ps) output with very high beam quality. The first example of such an FEL is the IR Demo FEL at the Thomas Jefferson National Accelerator Facility (Jefferson Lab), which produces nearly 2 kW of high average power on a routine basis. Housed in a multilaboratory user facility, we as well as members of our user community have started materials process studies in the areas mentioned earlier. I will present some of the first results of these studies. I will also briefly discuss the status of our DOD-funded project to upgrade the FEL to 10 kW in the mid IR.

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Materials processing applications using multi-kilowatt free-electron lasers

Shinn

2000

Conference on Lasers and Electro-Optics (CLEO 2000). Technical Digest. Postconference Edition. TOPS Vol.39 (IEEE Cat. No.00CH37

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Jefferson Lab. FEL user facility

Cited by 5 publications

References 0 publications

Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser

Xtreme optics: the behavior of cavity optics for the Jefferson Lab Free-Electron Laser

High-average-power free-electron lasers: a new laser source for materials processing

Materials processing applications using multi-kilowatt free-electron lasers

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