skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Coherent THz Synchrotron Radiation from a Storage Ring with High-Frequency RF System

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914377
Report Number(s):
BNL-78945-2007-JA
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. Lett.; Journal Volume: 96
Country of Publication:
United States
Language:
English
Subject:
national synchrotron light source

Citation Formats

Wang,F., Cheever, D., Farkhondeh, M., Franklin, W., Ihloff, E., van der Laan, J., McAllister, B., Milner, R., Tschalaer, C., and et al.. Coherent THz Synchrotron Radiation from a Storage Ring with High-Frequency RF System. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.064801.
Wang,F., Cheever, D., Farkhondeh, M., Franklin, W., Ihloff, E., van der Laan, J., McAllister, B., Milner, R., Tschalaer, C., & et al.. Coherent THz Synchrotron Radiation from a Storage Ring with High-Frequency RF System. United States. doi:10.1103/PhysRevLett.96.064801.
Wang,F., Cheever, D., Farkhondeh, M., Franklin, W., Ihloff, E., van der Laan, J., McAllister, B., Milner, R., Tschalaer, C., and et al.. Sun . "Coherent THz Synchrotron Radiation from a Storage Ring with High-Frequency RF System". United States. doi:10.1103/PhysRevLett.96.064801.
@article{osti_914377,
title = {Coherent THz Synchrotron Radiation from a Storage Ring with High-Frequency RF System},
author = {Wang,F. and Cheever, D. and Farkhondeh, M. and Franklin, W. and Ihloff, E. and van der Laan, J. and McAllister, B. and Milner, R. and Tschalaer, C. and et al.},
abstractNote = {},
doi = {10.1103/PhysRevLett.96.064801},
journal = {Phys. Rev. Lett.},
number = ,
volume = 96,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • The generation of brilliant, stable, and broadband coherent synchrotron radiation (CSR) in electron storage rings depends strongly on ring rf system properties such as frequency and gap voltage. We have observed intense coherent radiation at frequencies approaching the THz regime produced by the MIT-Bates South Hall Ring, which employs a high-frequency S-band rf system. The measured CSR spectral intensity enhancement with 2 mA stored current was up to 10 000 times above background for wave numbers near 3 cm{sup -1}. The measurements also uncovered strong beam instabilities that must be suppressed if such a very high rf frequency electron storagemore » ring is to become a viable coherent THz source.« less
  • We present the concepts for an electron storage ring dedicated to and optimized for the production of stable coherent synchrotron radiation (CSR) over the far-infrared terahertz wavelength range from 200 mm to about one cm. CIRCE (Coherent InfraRed CEnter) will be a 66 m circumference ring located on top of the ALS booster synchrotron shielding tunnel and using the existing ALS injector. This location provides enough floor space for both the CIRCE ring, its required shielding, and numerous beamlines. We briefly outline a model for CSR emission in which a static bunch distortion induced by the synchrotron radiation field ismore » used to significantly extend the stable CSR emission towards higher frequencies. This model has been verified with experimental CSR results. We present the calculated CIRCE photon flux where a gain of 6-9 orders of magnitude is shown compared to existing far-IR sources. Additionally, the particular design of the dipole vacuum chamber has been optimized to allow an excellent transmission of these far-infrared wavelengths. We believe that the CIRCE source can be constructed for a modest cost.« less
  • The mechanism of steady-state microbunching (SSMB) has been proposed [D.F. Ratner and A.W. Chao Phys. Rev. Lett. 105 154801 (2010)] to produce steady-state microbunched beams by using laser modulations in a storage ring for generating coherent radiation with high repetition rate at wavelengths from the submillimeter to extreme ultraviolet range. In the present paper, we analyze the dynamics of the SSMB system with a Hamiltonian and Jacobi matrix approach and identify the original proposal of SSMB as a mechanism with period-1 fixed point in phase space. We then propose an alternative SSMB mechanism with period-2 fixed point, which is ablemore » to produce microbunched beams with shorter bunch length and, hence, higher harmonic. Taking the SPEAR3 storage ring as an example, we illustrate the application of the period-2 SSMB to generate terahertz (THz) steady-state coherent radiation in a storage ring using an X-band radio-frequency (rf) system instead of a more technically demanding laser system. Issues covered include choice of rf parameters, system errors, beam lifetime, collective effects, and radiation power evaluation. Compared to the more traditional low-momentum-compaction operation mode, the proposed SSMB scheme potentially promises higher beam current, larger bunching factor, and hence brightness increase of at least 1 order of magnitude.« less