Keyword: target
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MOCOYBS04 Electrodisintegration of 16O and the Rate Determination of the Radiative Alpha Capture on 12C at Stellar Energies electron, experiment, multipole, photon 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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TUCOXBS05 Beam Timing and Cavity Phasing cavity, linac, acceleration, injection 39
 
  • R.M. Koscica, N. Banerjee, G.H. Hoffstaetter, W. Lou, G.T. Premawardhana
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  In a multi-pass Energy Recovery Linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration. The beam should also achieve specific energy targets during each loop that returns it to the linac. To satisfy the energy recovery and loop requirements, one must specify the phase and voltage of cavity fields, and one must control the beam flight times through the return loops. Adequate values for these parameters can be found by using a full scale numerical optimization program. If symmetry is imposed in beam time and energy during acceleration and deceleration, the number of parameters needed decreases, simplifying the optimization. As an example, symmetric models of the Cornell BNL ERL Test Accelerator (CBETA) are considered. Energy recovery results from recent CBETA single-turn tests are presented, as well as multi-turn solutions that satisfy CBETA optimization targets of loop energy and zero cavity loading.  
slides icon Slides TUCOXBS05 [5.186 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOXBS05  
About • paper received ※ 13 September 2019       paper accepted ※ 01 November 2019       issue date ※ 24 June 2020  
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