An infrared free-electron laser for the Chemical Dynamics Research Laboratory. Design report

Technical Report · Wed Apr 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/10158083· OSTI ID:10158083

Vaughan, D ^[1]

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1. comp.

This document describes a free-electron laser (FEL) proposed as part of the Chemical Dynamics Research Laboratory (CDRL), a user facility that also incorporates several advanced lasers of conventional design and two beamlines for the ALS. The FEL itself addresses the needs of the chemical sciences community for a high-brightness, tunable source covering a broad region of the infrared spectrum -- from 3 to 50 {mu}m. All of these sources, together with a variety of sophisticated experimental stations, will be housed in a new building to be located adjacent to the ALS. The radiation sources can be synchronized to permit powerful two-color, pump-probe experiments that will further our fundamental understanding of chemical dynamics at the molecular level, especially those aspects relevant to practical issues in combustion chemistry. The technical approach adopted in this design makes use of superconducting radiofrequency (SCRF) accelerating structures. The primary motivation for adopting this approach was to meet the user requirement for wavelength stability equal to one part in 10{sup 4}. Previous studies concluded that a wavelength stability of only one part in 10{sup 3} could be achieved with currently available room-temperature technology. In addition, the superconducting design operates in a continuous-wave (cw) mode and hence offers considerably higher average optical output power. It also allows for various pulse-gating configurations that will permit simultaneous multiuser operations. A summary of the comparative performance attainable with room-temperature and superconducting designs is given. The FEL described in this report provides a continuous train of 30-ps micropulses, with 100{mu}J of optical energy per micropulse, at a repetition rate of 6.1 MHz. The device can also deliver pulses at a cw repetition rate of 12.2 MHz, with a peak power of 50 {mu}J per micropulse. 70 ref.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10158083
• Report Number(s): LBL-PUB-5335; ON: DE92017018
• Resource Relation: Other Information: PBD: Apr 1992
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
43 PARTICLE ACCELERATORS
FREE ELECTRON LASERS
DESIGN
INFRARED RADIATION
ELECTRON BEAMS
BEAM TRANSPORT
RF SYSTEMS
LINEAR ACCELERATORS
CRYOGENICS
SHIELDING
BEAM INJECTION
CONTROL SYSTEMS
SAFETY
QUALITY ASSURANCE
PULSES
TIME RESOLUTION
426002
430302
430303
LASERS AND MASERS
INJECTION AND EXTRACTION SYSTEMS
EXPERIMENTAL FACILITIES AND EQUIPMENT