On-line Electron Beam Measurements for the Los Alamos Free-Electron Laser PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download On-line Electron Beam Measurements for the Los Alamos Free-Electron Laser PDF full book. Access full book title On-line Electron Beam Measurements for the Los Alamos Free-Electron Laser by . Download full books in PDF and EPUB format.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Recent developments in the electron beam diagnostics used on the Los Alamos Free-Electron Laser (FEL) have extended our on-line, quantitative analysis capability to extraction efficiency and micropulse temporal duration. The FEL's 20-MeV electron beam is 100 .mu.s in length and consists of approx. 2000 micropulses of 20-ps duration and 46-ns separation. This extreme range of time scales is addressed by employing a combination of synchronized beam deflectors, an electron spectrometer, intensified video cameras, real-time video digitizers, and microcomputers. The tapered wiggler result for extraction efficiency (2%) and results for pulse duration measurements (10 to 15 ps) by two techniques are presented.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Recent developments in the electron beam diagnostics used on the Los Alamos Free-Electron Laser (FEL) have extended our on-line, quantitative analysis capability to extraction efficiency and micropulse temporal duration. The FEL's 20-MeV electron beam is 100 .mu.s in length and consists of approx. 2000 micropulses of 20-ps duration and 46-ns separation. This extreme range of time scales is addressed by employing a combination of synchronized beam deflectors, an electron spectrometer, intensified video cameras, real-time video digitizers, and microcomputers. The tapered wiggler result for extraction efficiency (2%) and results for pulse duration measurements (10 to 15 ps) by two techniques are presented.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
An electron beam diagnostic for the Los Alamos free-electron laser (FEL) oscillator experiment has been used to measure the time dependence of the electron energy distribution in a 100-.mu.s time interval. The electron beam consists of macropulses that have a duration of 100 .mu.s and a repetition rate of 1 Hz. Each macropulse consists of a series of micropulses that have approx. 30 ps duration, approx. 50 A peak current, and approx. 50 ns separation. The primary purpose of the electron beam diagnostic is measurement of the time dependence of the electron energy distribution during the build-up of the photon field in the oscillator. Since the exact time of build-up depends on various rf and cavity considerations, provisions were made to allow the observation window to be varied from 10 to 100 .mu.s and to be delayed by times up to 100 .mu.s. 5 references, 9 figures.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Optical transition radiation (OTR) measurements of the electron-beam emittance have been performed at a location just before the wiggler in the Los Alamos Free-Electron Laser (FEL) experiment. Beam profiles and beam divergence patterns from a single macropulse were recorded simultaneously using two intensified charge-injection device (CID) television cameras and an optical beamsplitter. Both single-foil OTR and two-foil OTR interference experiments were performed. Preliminary results are compared to a reference variable quadrupole, single screen technique. New aspects of using OTR properties for pointing the e-beam on the FEL oscillator axis, as well as measuring e-beam emittance are addressed. 7 refs., 9 figs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Experiments have been concluded demonstrating energy recovery in conjunction with the Los Alamos free-electron laser. In this paper, we discuss measurements of electron-beam transport during decelerations greater than 70% from 21 MeV down to 5 MeV. Power-flow measurements demonstrate the efficient conversion of beam power back into rf power and its reuse in the accelerator. We also describe instabilities of the system and compare them with simulations.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Electron-beam diagnostics for the Los Alamos free-electron-laser oscillator experiment have been designed to measure the time dependence of the electron energy distribution with time intervals ranging from 30 ps to 200 .mu.s. The electron beam consists of macropulses that have a 100-.mu.s duration and a 1-Hz repetition rate. Each macropulse consists of a series of micropulses that have approx. 30 ps duration, approx. 50 A peak current, and approx. 50 ns separation. The primary purposes of the electron-beam diagnostics is twofold: (1) optimization of the bunching system to provide a maximum peak current in the micropulses; and (2) measurement of the time dependence of the electron energy distribution during build-up of the photon field in the oscillator. Because the exact time of build-up is uncertain, provisions have been made to allow the observation window to be varied from 10 to 100 .mu.s and to be delayed by times up to 100 .mu.s.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The on-line extraction efficiency analysis procedures for the Los Alamos Free-Electron Laser are described. The analyses are based on the measurement of the electron beam's energy spectron as a function of time under lasing and nonlasing conditions. In the nongraphic, tuneup mode the procedure takes about six seconds, so at a 1 Hz repetition rate for the laser we can analyse one out of every six shots. If graphics output is desired, it is produced at a 20-s repetition rate. The tapered wiggler result for extraction efficiency, eta approx. 2% is presented as an example.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Get Book Here
Book Description
We have developed image analysis software to facilitate the analysis of optical transition radiation (OTR) patterns generated by the electron beam from the Los Alamos free-electron laser facility. The software can be used for beam alignment, beam profile and angular divergence measurements, and the programs run on an IBM AT microcomputer. The programs and their use are described and some results shown. 2 refs., 17 figs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
The Los Alamos free-electron laser (FEL) amplifier experiment was designed to demonstrate high efficiency for transfer of energy from an electron beam to a light beam in the magnetic field of a tapered wiggler. Initial results indicate an energy transfer consistent with theory. Distinct groups of decelerated electrons as well as accelerated electrons are clearly present in the energy spectrum of electrons emerging from the wiggler when the laser light is present. The observed energy decrease for the electrons captured in the decelerating bucket is approx. 6% and the average decrease of the entire energy distribution is approx. 2% for the conditions of these initial measurements.
