Keyword: experiment
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MOCOXBS05 Status of the MESA ERL Project linac, electron, cavity, MMI 14
 
  • F. Hug, K. Aulenbacher, R.G. Heine, D. Simon
    KPH, Mainz, Germany
  • K. Aulenbacher
    GSI, Darmstadt, Germany
  • K. Aulenbacher, S. Friederich
    HIM, Mainz, Germany
  • S. Friederich, P. Heil, R.F.K. Kempf, C. Matejcek
    IKP, Mainz, Germany
 
  Funding: This work has been supported by DFG through the PRISMA+ cluster of excellence EXC 2118/2019 and by the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871.
MESA is a recirculating superconducting accelerator under construction at Johannes Gutenberg-Universität Mainz. It can be operated in either external beam or ERL mode and will be used for high precision particle physics experiments. The operating beam current and energy in EB mode is 0.15 mA with polarized electrons at 155 MeV. In ERL mode a polarized beam of 1 mA at 105 MeV will be available. In a later construction stage of MESA the beam current in ERL-mode shall be upgraded to 10 mA (unpolarized). Civil construction and commissioning of components like electron gun, LEBT and SRF modules have been started already. We will give a project overview including the accelerator layout, the current status and an outlook to the next construction and commissioning steps.
 
slides icon Slides MOCOXBS05 [14.029 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOXBS05  
About • paper received ※ 14 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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MOCOYBS04 Electrodisintegration of 16O and the Rate Determination of the Radiative Alpha Capture on 12C at Stellar Energies electron, multipole, photon, target 18
 
  • I. Friščić, T.W. Donnelly, R. Milner
    MIT, Cambridge, Massachusetts, USA
 
  Funding: This research is supported by the U.S. Department of Energy Office of Nuclear Physics (Grant No. DE-FG02-94ER40818)
For over five decades one of the most important goals of experimental nuclear astrophysics has been to reduce the uncertainty in the S-factor of radiative alpha capture on 12C at stellar energies. We have developed a simple model, which relates the radiative capture reaction and the exclusive electrodisintegration reaction. We then show that by measuring the rate of electrodisintegration of 16O in a high luminosity experiment using a state-of-the-art gas target and a new generation of energy-recovery linear (ERL) electron accelerators under development, it is possible to significantly improve the statistical uncertainty of the radiative alpha capture on 12C in terms of E1 and E2 S-factors in the astrophysically interesting region, which are the key inputs for any nucleosynthesis and stellar evolution models. The model needs to be validated experimentally, but, if successful, it can be used to improve the precision of other astrophysically-relevant, radiative capture reactions, thus opening a significant avenue of research that spans nuclear structure, astrophysics and high-power accelerator technology.
 
slides icon Slides MOCOYBS04 [4.003 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-MOCOYBS04  
About • paper received ※ 15 September 2019       paper accepted ※ 04 November 2019       issue date ※ 24 June 2020  
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TUCOXBS03 Beam Dynamics Layout of the MESA ERL linac, operation, acceleration, electron 28
 
  • F. Hug, K. Aulenbacher, D. Simon, C.P. Stoll, S.D.W. Thomas
    KPH, Mainz, Germany
  • K. Aulenbacher
    GSI, Darmstadt, Germany
  • K. Aulenbacher
    HIM, Mainz, Germany
 
  Funding: This work has been supported by DFG through the PRISMA+ cluster of excellence EXC 2118/2019 and by the European Union’s Horizon 2020 Research and Innovation programme under Grant Agreement No 730871.
The MESA project is currently under construction at Johannes Gutenberg-Universität Mainz. It will be used for high precision particle physics experiments in two different operation modes: external beam (EB) mode (0.15 mA; 155 MeV) and energy recovery (ERL) mode (1 mA; 105 MeV). The recirculating main linac follows the concept of a double sided accelerator design with vertical stacking of return arcs. Up to three recirculations are possible. Acceleration is done by four TESLA/XFEL 9-cell SRF cavities located in two modified ELBE cryomodules. Within this contribution the recirculation optics for MESA will be presented. Main goals are achieving best energy spread at the experimental setups in recirculating ERL and non-ERL operation and providing small beta-functions within the cryomodules for minimizing HOM excitation at high beam currents.
 
slides icon Slides TUCOXBS03 [5.077 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS03  
About • paper received ※ 16 September 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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WEPNEC08 Dispersion Matching With Space Charge in MESA space-charge, injection, recirculation, electron 74
 
  • A. Khan, O. Boine-Frankenheim
    TEMF, TU Darmstadt, Darmstadt, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
 
  Funding: Supported by the DFG through GRK 2128.
For intense electron bunches traversing through bends, as for example the recirculation arcs of an Energy-Recovery Linac (ERL), dispersion matching with space charge of an arc into the subsequent radio-frequency (RF) structure is essential to maintain the beam quality. We show that beam envelopes and dispersion along the bends and recirculation arcs of an ERL, including space charge forces, can be matched to adjust the beam to the parameters of the subsequent section. The present study is focused on a small-scale, double-sided recirculating linac Mainz Energy-recovering Superconducting Accelerator (MESA). MESA is an under construction two pass ERL at the Johannes Gutenberg-Universit\"at Mainz, which should deliver a continuous wave (CW) beam at 105 MeV for physics experiments with a pseudo-internal target. In this work, a coupled transverse-longitudinal beam matrix approach for matching with space charge in MESA is employed.
 
poster icon Poster WEPNEC08 [1.190 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC08  
About • paper received ※ 12 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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