Space charge compensation with pulsed electron lenses for intense ion beams in synchrotrons

Stem, William D.

doi:10.1016/j.nima.2018.04.014

Cited by 11 publications

(14 citation statements)

References 17 publications

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“…2 and Eqs. (9,16). In contrast, for a transverse detuning there is no effective impedance modification and only Landau damping is affected.…”

Section: Discussionmentioning

confidence: 98%

“…2. This is the regime foreseen for a PEL in the SIS100 as a space-charge compensation device [16]. Due to the large mode spectrum modification by PEL, expressions of Eq.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, the transverse distribution of the electron beam is assumed to be homogeneous. This PEL was proposed in [16] for space-charge compensation in the SIS18 [17]/SIS100 [18]. Instead a DC EL relies on the transverse nonlinearity of the electron beam's electromagnetic field providing tune shifts depending on the transverse single-particle amplitudes.…”

Section: Introductionmentioning

confidence: 99%

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Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Gubaidulin¹,

Kornilov²,

Métral³

2022

Preprint

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A pulsed electron lens produces a betatron tune shift along a hadron bunch as a function of the longitudinal coordinates, which is a longitudinal detuning. An example of transverse detuning are the tune shifts due to octupole magnets. This paper considers a pulsed electron lens as a measure to mitigate the head-tail instabilities. Using a detailed analytical description within a Vlasov formalism, the coherent properties of the longitudinal and transverse detuning are presented. The analytical predictions are compared with the results of the particle tracking simulations. A pulsed electron lens is demonstrated to be a source of tune spread with two components: a static one, leading to Landau damping; and a dynamic one, leading to an effective impedance modification, which we demonstrate analytically and in our particle tracking simulations. The effective impedance modification can be important for beam stability due to devices causing a longitudinal detuning, especially for nonzero head-tail modes. The Vlasov formalism is extended to include the combination of longitudinal and transverse detuning. As a possible application at the SIS100 heavy-ion synchrotron (Facility for Antiproton and Ion Research (FAIR) at GSI Darmstadt, Germany), a combination of a pulsed electron lens with octupole magnets is considered.

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“…2 and Eqs. (9,16). In contrast, for a transverse detuning there is no effective impedance modification and only Landau damping is affected.…”

Section: Discussionmentioning

confidence: 98%

“…2. This is the regime foreseen for a PEL in the SIS100 as a space-charge compensation device [16]. Due to the large mode spectrum modification by PEL, expressions of Eq.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Gubaidulin¹,

Kornilov²,

Métral³

2022

Preprint

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“…4. pulsed electron lenses: for the existing SIS18 pulsed electron lenses for partial compensation of the space charge tune spread are under consideration [21]. Studies for the SIS100 are ongoing.…”

Section: Beta Beat Correctionmentioning

confidence: 99%

Beam quality and beam loss predictions with space charge for SIS100

et al. 2020

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The SIS100 synchrotron as a part of the new FAIR accelerator facility at GSI should be operated at the "space charge limit" for light and heavy-ion beams. Losses due to space charge induced resonance crossing should not exceed a few percent during a full cycle. Detailed magnet field measurements are now available for 72 out of the total 108 main SIS100 dipole magnets. Particle tracking studies including nonlinear field errors up to 7 th order in the main magnets together with different space charge models are performed. Because of the long time scales reduced space charge models are employed for tune scans. First comparisons with simulations using a self-consistent space charge solver are discussed as well as potential measures to further improve the options in tune space for the reference intensities and beyond. K: Accelerator modelling and simulations (multi-particle dynamics; single-particle dynamics); Beam dynamics; Beam Optics 1Corresponding author.

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“…However, the SIS18 will serve as testbed to demonstrate the space charge compensation scheme and the electron lens with an interaction length of 3.36 m will be installed in one of the available drift sections [1]. The SIS18 ion beam has an elliptical cross section over the length of the interaction region and has to be transversally embedded into a homogeneous electron beam while the pulse needs to be exactly matched to the bunch form in order to avoid over-compensation of the bunch head and tail as presented in [2]. During acceleration of the ion beam the SC tune spread reaches its maximum.…”

Section: Introductionmentioning

confidence: 99%

Status of the development of the electron lens for space charge compensation at GSI

Schulte-Urlichs

Droba

Dönges

et al. 2023

J. Phys.: Conf. Ser.

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At GSI a prototype electron lens for space charge (SC) compensation is currently being designed and main components as the RF-modulated electron gun are already under commissioning. The goal of this project is the (partial) compensation of SC forces within the ion beam by an overlapping electron beam. This may help to increase the intensity of primary beams, especially in the FAIR facility and potentially all large synchrotrons operated at the SC limit. For an effective SC compensation, the generated electron beam needs to follow the transverse and longitudinal beam profile of the ion bunch structure. The requirements are maximum currents of 10 A and grid modulation to cover a broad frequency range from 400 kHz to 1 MHz. The RF-modulated electron gun was designed and manufactured in the scope of the ARIES collaboration and is currently being tested at the E-Lens Lab of Goethe-University Frankfurt. A dedicated test bench was built for commissioning of the major e-lens components and diagnostics. In this contribution the overall set-up will be presented putting special emphasis on the beam dynamics and collector design as well as simulation results of the electron gun.

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Space charge compensation with pulsed electron lenses for intense ion beams in synchrotrons

Cited by 11 publications

References 17 publications

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons

Beam quality and beam loss predictions with space charge for SIS100

Status of the development of the electron lens for space charge compensation at GSI

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