Coherent synchrotron radiation instability in a bunch compressor

Heifets, S.; Stupakov, Gennady; Krinsky, S.

doi:10.1103/physrevstab.5.064401

Cited by 154 publications

(78 citation statements)

References 5 publications

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“…It is assumed here that energy modulations are accumulated upstream of the chicane but not inside: there the self-interaction is suppressed due to R 51 and R 52 effects [11][12][13]. We also assume in the following that a length of the drift space is much larger than that of the chicane, while the R 56 of the drift space is much smaller.…”

Section: B Formula For a Gain Per Cascadementioning

confidence: 99%

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Using the longitudinal space charge instability for generation of vacuum ultraviolet and x-ray radiation

Schneidmiller

Yurkov²

2010

Phys. Rev. ST Accel. Beams

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Longitudinal space charge (LSC) driven microbunching instability in electron beam formation systems of x-ray free-electron lasers (FELs) is a recently discovered effect hampering beam instrumentation and FEL operation. The instability was observed in different facilities in infrared and visible wavelength ranges. In this paper we propose to use such an instability for generation of vacuum ultraviolet (VUV) and x-ray radiation. A typical longitudinal space charge amplifier (LSCA) consists of few amplification cascades (drift space plus chicane) with a short undulator behind the last cascade. If the amplifier starts up from the shot noise, the amplified density modulation has a wide band, on the order of unity. The bandwidth of the radiation within the central cone is given by an inverse number of undulator periods. A wavelength compression could be an attractive option for LSCA since the process is broadband, and a high compression stability is not required. LSCA can be used as a cheap addition to the existing or planned short-wavelength FELs. In particular, it can produce the second color for a pump-probe experiment. It is also possible to generate attosecond pulses in the VUV and x-ray regimes. Some user experiments can profit from a relatively large bandwidth of the radiation, and this is easy to obtain in the LSCA scheme. Finally, since the amplification mechanism is broadband and robust, LSCA can be an interesting alternative to the self-amplified spontaneous emission free-electron laser (SASE FEL) in the case of using laser-plasma accelerators as drivers of light sources.

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Section: B Formula For a Gain Per Cascadementioning

confidence: 99%

“…It is advisable to reduce it (if technically possible), since the wavelength (8) and length of the drift space (12) are also reduced but the gain (13) stays the same. This happens until the spread of longitudinal velocities starts playing a role, i.e.…”

Section: Formulas For An Optimized Lsc Amplifiermentioning

confidence: 99%

Using the longitudinal space charge instability for generation of vacuum ultraviolet and x-ray radiation

Schneidmiller

Yurkov²

2010

Phys. Rev. ST Accel. Beams

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“…The effect of radiation shielding [21][22][23] is neglected, since the wavelength at which the CSR starts being suppressed by the vacuum chamber [22], ! 2hðh=RÞ 1=2 ffi 1 mm (h is the vacuum chamber gap and R the bending radius), is much longer than the electron bunch length, 40 m z 80 m. Particle-field interactions on a scale much shorter than the bunch length such as those driving the so-called microbunching instability [24][25][26][27] are ignored on the ground that the analysis of the microbunching instability [26,27] predicts a small gain for the experimental configuration of this study. For the sake of simplicity, the CSR emission and its interaction with the electrons is described below within the bounds of the single-kick approximation.…”

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confidence: 94%

Cancellation of Coherent Synchrotron Radiation Kicks with Optics Balance

2013

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Minimizing transverse emittance is essential in linear accelerators designed to deliver very high brightness electron beams. Emission of coherent synchrotron radiation (CSR), as a contributing factor to emittance degradation, is an important phenomenon to this respect. A manner in which to cancel this perturbation by imposing certain symmetric conditions on the electron transport system has been suggested.We first expand on this idea by quantitatively relating the beam Courant-Snyder parameters to the emittance growth and by providing a general scheme of CSR suppression with asymmetric optics, provided it is properly balanced along the line. We present the first experimental evidence of this cancellation with the resultant optics balance of multiple CSR kicks: the transverse emittance of a 500 pC, sub-picosecond, high brightness electron beam is being preserved after the passage through the achromatic transfer line of the FERMI@Elettra free electron laser, and emittance growth is observed when the optics balance is intentionally broken. We finally show the agreement between the theoretical model and the experimental results. This study holds the promise of compact dispersive lines with relatively large bending angles, thus reducing costs for future electron facilities.

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“…As a bunch propagates through the bends of a magnetic bunch compressor, the tail-head interaction due to CSR induces increased beam energy spread and transverse emittance dilution that can degrade the downstream FEL performance [1][2][3]. In addition, the CSR interaction is known to generate a microbunching instability in which large-amplitude current modulations can grow from small-amplitude, shortwavelength variations in the initial current profile [4,5].…”

Section: Introductionmentioning

confidence: 99%

Longitudinal pulse shaping for the suppression of coherent synchrotron radiation-induced emittance growth

Mitchell

Qiang

Emma

2013

Phys. Rev. ST Accel. Beams

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The damaging effect of coherent synchrotron radiation (CSR) on the emittance and energy spread of high-energy beams in accelerator light sources can significantly constrain the machine design and performance. We propose a mitigation approach in which the dynamical effect of the longitudinal component of CSR is suppressed by appropriately preparing the initial longitudinal current profile of the beam. In a chicane, a linear theory for the mechanism of CSR-induced emittance growth is used to demonstrate how this procedure can produce a beam whose core experiences suppressed transverse emittance growth. The dynamics of such a beam is illustrated for the Berlin-Zeuthen CSR benchmark chicane.

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Coherent synchrotron radiation instability in a bunch compressor

Cited by 154 publications

References 5 publications

Using the longitudinal space charge instability for generation of vacuum ultraviolet and x-ray radiation

Using the longitudinal space charge instability for generation of vacuum ultraviolet and x-ray radiation

Cancellation of Coherent Synchrotron Radiation Kicks with Optics Balance

Longitudinal pulse shaping for the suppression of coherent synchrotron radiation-induced emittance growth

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