A model for producing stable, broadband terahertz coherent synchrotron radiation in storage rings

Sannibale, F.; Byrd, J.; Loftsdottir, Agusta; Martin, Michael; Venturini, M.

doi:10.1109/pac.2003.1289503

Cited by 3 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This stable CSR emission is not driven by any instabilities, yet it extends to higher frequencies than predicted by a simple full-bunch coherence model [12]. We outline the model we have developed to explain this phenomenon [13]. The combination of the experimentally verified models for stable CSR as well as the threshold of which current levels will produce bursting instabilities allows us to fully design and optimize a new CSR source that will produce copious amounts of stable far-IR, THz and sub-THz, synchrotron radiation.…”

Section: Introductionmentioning

confidence: 87%

“…This observation is in disagreement with the CSR emission predicted for the normal Gaussian bunch shape, and implies a distortion in the electron bunch distribution. We have developed a detailed model for how CSR can self-induce a static d eformation of the electron bunch profile thus generating CSR to higher frequencies than the nominal bunch length would allow [13]. Figure 1 shows how in this model the synchrotron wakefield generated by the CSR itself acts on the electron bunch such that the bunch gets a sharper leading edge which coherently emits to frequencies three times higher than the undistorted bunch.…”

Section: Production Of Stable Csrmentioning

confidence: 99%

“…In the design of such a source one of the fundamental requirements is the stability of the CSR emission. We have therefore optimized the various machine parameters to maximize the CSR emission while keeping the beam current below the bursting threshold [9,13]. We maximize the CSR bandwidth by designing a vacuum chamber with a very low frequency cutoff to allow for transmission of wavelengths out to ~1 cm, and by tuning the ring parameters to increase the static distortion of the electron bunch profile as discussed above to extend the CSR emission to shorter wavelengths.…”

Section: Circe Ring Design and Beamline Extractionmentioning

confidence: 99%

“…The three different CIRCE curves represent three (of many) possible machine configurations. To maximize the CSR bandwidth toward the short wavelengths, we need to decrease the electron bunch length while keeping the distribution distortion to the maximum allowed by the model stability criterion for the bursting instability [13]. At shorter bunch lengths, the threshold for bursting becomes lower so the total number of electrons and therefore the total CSR power emitted is limited (red curve in Figure 4).…”

Section: Circe Performancementioning

confidence: 99%

See 3 more Smart Citations

CIRCE: a dedicated storage ring for coherent THz synchrotron radiation

Byrd

Martin

McKinney

et al. 2004

Infrared Physics & Technology

View full text Add to dashboard Cite

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 µm 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 is 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.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Production Of Stable Csrmentioning

confidence: 99%

Section: Circe Ring Design and Beamline Extractionmentioning

confidence: 99%

Section: Circe Performancementioning

confidence: 99%

See 2 more Smart Citations

CIRCE: a dedicated storage ring for coherent THz synchrotron radiation

Byrd

Martin

McKinney

et al. 2004

Infrared Physics & Technology

View full text Add to dashboard Cite

show abstract

“…A practical application of this effect is the generation of THz coherent synchrotron radiation in synchrotrons with X‐ray incoherent synchrotron radiation (e.g. Sannibale et al 2003). The pulsar synchrotron is certainly very different from an earth synchrotron.…”

Section: Coherent Radio Emissionmentioning

confidence: 99%

The pulsar synchrotron: coherent radio emission

Contopoulos

2009

Monthly Notices of the Royal Astronomical Society: Letters

View full text Add to dashboard Cite

We propose a simple physical picture for the generation of coherent radio emission in the axisymmetric pulsar magnetosphere that is quite different from the canonical paradigm of radio emission coming from the magnetic polar caps. In this first paper we consider only the axisymmetric case of an aligned rotator. Our picture capitalizes on an important element of the MHD representation of the magnetosphere, namely the separatrix between the corotating closed-line region (the `dead zone') and the open field lines that originate in the polar caps. Along the separatrix flows the return current that corresponds to the main magnetospheric electric current emanating from the polar caps. Across the separatrix, both the toroidal and poloidal components of the magnetic field change discontinuously. The poloidal component discontinuity requires the presence of a significant annular electric current which has up to now been unaccounted for. We estimate the position and thickness of this annular current at the tip of the closed line region, and show that it consists of electrons (positrons) corotating with Lorentz factors on the order of 10^5, emitting incoherent synchrotron radiation that peaks in the hard X-rays. These particles stay in the region of highest annular current close to the equator for a path-length of the order of one meter. We propose that, at wavelengths comparable to that path-length, the particles emit coherent radiation, with radiated power proportional to N^2, where N is the population of particles in the above path-length. We calculate the total radio power in this wavelength regime and its scaling with pulsar period and stellar magnetic field and show that it is consistent with estimates of radio luminosity based on observations.Comment: Monthly Notices Letters, in pres

show abstract

Compact Storage Ring for Far-Infrared Coherent Synchrotron Radiation Source

Kim¹

2007

jjap

View full text Add to dashboard Cite

We present the results of design studies for a compact storage ring that may produce coherent synchrotron radiation in the farinfrared frequency range. The momentum compaction factor in the ring is easily varied by controlling dispersion function and thus a short bunch length of a few picoseconds can be achieved. We have performed a detailed analysis of beam dynamics for a short bunch length in the ring. Within the controllable range of the second-order momentum compaction factor in the ring, it was shown that the alpha bucket and the rf bucket were created. It is shown that the compact ring with conservative machine errors has a sufficient dynamic aperture after the correction of closed orbit distortion. Multi-particle tracking simulations are performed to investigate longitudinal beam instability due to the broadband impedance in the ring. We investigated the effects of coherent synchrotron radiation wake in the ring on longitudinal beam distribution. From these studies, it is shown that the designed compact ring may provide stable electron beams of approximately around 2 ps rms.

show abstract

A model for producing stable, broadband terahertz coherent synchrotron radiation in storage rings

Cited by 3 publications

References 8 publications

CIRCE: a dedicated storage ring for coherent THz synchrotron radiation

CIRCE: a dedicated storage ring for coherent THz synchrotron radiation

The pulsar synchrotron: coherent radio emission

Compact Storage Ring for Far-Infrared Coherent Synchrotron Radiation Source

Contact Info

Product

Resources

About