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2021-02-19
06:13
Identification of impedance sources responsible for longitudinal beam instabilities in the CERN PS / Lasheen, A (CERN) ; Damerau, H (CERN) ; Favia, G (CERN) ; Kozlowski, P (CERN) ; Popovic, B (CERN)
Longitudinal instabilities in the CERN PS are an important limitation to obtain the expected beam intensity and longitudinal emittance at the PS extraction in the framework of the LHC Injector Upgrade (LIU) project. The observed coupled-bunch instabilities lead to dipolar and quadrupolar oscillations, as well as to an uncontrolled longitudinal emittance blow-up for proton beams. [...]
2020 - 7 p. - Published in : 10.23732/CYRCP-2020-009.323 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.323-329 (CERN-2020-009)

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2021-02-17
06:31
Active methods of suppressing longitudinal multi-bunch instabilities / Bertin, F (CERN) ; Damerau, H (CERN) ; Favia, G (CERN) ; Lasheen, A (CERN)
Longitudinal multi-bunch instabilities limit the beam intensity and quality reach of hadron synchrotrons. In case the impedance source driving the instability is well known, for example an RF cavity, active feedback can be set up locally to reduce its effect on the beam. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.197 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.197 (CERN-2020-009)

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2021-02-17
06:31
Low impedance design with example of kickers (including cables) and potential of metamaterials / Zannini, C (CERN) ; Barnes, M.J. (CERN) ; Biancacci, N (CERN) ; Danisi, A (CERN) ; Koukovini-Platia, E (CERN) ; Métral, E (CERN) ; Rumolo, G (CERN) ; Salvant, B (CERN)
Unmatched terminations of single elements were recently identified to be responsible for beam instabilities in the CERN PSB and LEIR machines. Impedance models are needed to estimate the impedance of similar devices and to assess potential intensity limitations. [...]
2020 - 8 p. - Published in : 10.23732/CYRCP-2020-009.167 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.167 (CERN-2020-009)

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2021-02-17
06:31
Source of horizontal instability at the CERN Proton Synchrotron Booster / Koukovini-Platia, E (CERN) ; Barnes, M J (CERN) ; Bartosik, H (CERN) ; Rumolo, G (CERN) ; Sermeus, L (CERN) ; Zannini, C (CERN)
The CERN Proton Synchrotron Booster (PSB) has been known to suffer from horizontal instabilities since its early operation. These instabilities appear at specific beam energies and range of working points. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.148 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.148 (CERN-2020-009)

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2021-02-17
06:31
Diagnostics with quadrupolar pick-ups / Oeftiger, A (Darmstadt, GSI ; CERN)
The spectrum of a quadrupolar pick-up gives access to coherent second-order modes of a beam in a non-invasive way. The signature of bunched beams not only features the first-order and second-order dipolar modes, but also most notably (1.) bands of even envelope modes, (2.) odd (skew) envelope modes and (3.) coherent dispersion modes. [...]
2020 - 7 p. - Published in : 10.23732/CYRCP-2020-009.130 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.130 (CERN-2020-009)

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2021-02-09
06:14
Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance / Biancacci, N (CERN) ; Métral, E (CERN) ; Migliorati, M (INFN, Rome ; Rome U.)
A destabilizing effect of the detuning impedance has been recently observed in simulations of the CERN Proton Synchrotron (PS) at the injection energy: while without the detuning impedance the instability is faster in the vertical plane as expected (due to the elliptical shape of the vacuum chamber), with detuning impedance the instability appears to be faster in the horizontal plane. In order to understand the detuning impedance destabilizing effect, we study the collective behavior for the simpler case of a coasting beam with PS-like parameters and a simplified impedance model. [...]
2021 - 7 p. - Published in : Phys. Rev. Accel. Beams 23 (2021) 124402 Fulltext from Publisher: PDF;

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2021-01-25
08:28
Longitudinal Phase Space Tomography Version 3 / Grindheim, Christoffer Hjerto (Western Norway University of Applied Sciences (NO)) ; Albright, Simon (CERN)
Longitudinal phase space tomography is essential in most of the CERN synchrotrons to measure longitudinal beam parameters. [...]
CERN-ACC-NOTE-2021-0004. - 2021. - 24 p.
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2021-01-15
11:59
Space charge and intrabeam scattering effects for Lead-ions and Oxygen-ions in the LHC injector chain / John, Isabelle (Lund University (SE)) ; Bartosik, Hannes (CERN)
In the context of a possible LHC run with Oxygen-ion beams in about 2023, this report presents results of the space charge and intrabeam scattering effects for the Oxygen beam in comparison to the operational Lead beam in the LHC ion-injector chain (LEIR, PS and SPS). [...]
CERN-ACC-NOTE-2021-0003. - 2021. - 31 p.

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2021-01-13
13:50
Production of mass separated $^{11}$C beams for PET-aided hadron therapy / Stegemann, Simon Thomas
Ever since the first discovery of an artificially-generated radionuclide, the production of radioisotopes and radioactive ion beams has been an essential tool in nuclear physics research for the study of the atomic nucleus and its properties [...]
CERN-THESIS-2020-257 -

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2020-12-16
17:05
Development of a Novel Transverse Beam Profile and Emittance Monitor for the CERN Proton Synchrotron / Sandberg, Hampus
Beam profile and emittance monitoring is essential to understand the dynamic be- haviour of the ensemble of particles in an accelerator beam [...]
CERN-THESIS-2020-236 - 239 p.

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