Energy acceptance of the St. George recoil separator

Meisel, Z.; Moran, M.; Gilardy, G.; Schmitt, J.; Seymour, C.; Couder, M.

doi:10.1016/j.nima.2017.01.035

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…To optimize the rejection of a separator, methods employed at other facilities such as DRAGON at TRIUMF [9] and the St. GEORGE recoil separator at Notre Dame University [10] have typically involved scaling from known tunes that were shown to provide good results in the past, or by manually adjusting quadrupoles one by one to find the optimal tune about some nominal ionoptical settings obtained from beam physics calculations [11]. Since SECAR is a novel device, previous tunes are not readily available.…”

Section: I2 Traditional Tuning Methodsmentioning

confidence: 99%

Online Bayesian Optimization for a Recoil Mass Separator

Miskovich,

Montes,

Berg

et al. 2022

Preprint

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The SEparator for CApture Reactions (SECAR) is a next-generation recoil separator system at the Facility for Rare Isotope Beams (FRIB) designed for the direct measurement of capture reactions on unstable nuclei in inverse kinematics. To maximize the performance of this system, stringent requirements on the beam alignment to the central beam axis and on the ion-optical settings need to be achieved. These can be difficult to attain through manual tuning by human operators without potentially leaving the system in a sub-optimal and irreproducible state. In this work, we present the first development of online Bayesian optimization with a Gaussian process model to tune an ion beam through a nuclear astrophysics recoil separator. We show that this method achieves small incoming angular deviations (<1 mrad) in an efficient and reproducible manner that is at least three times faster than standard hand-tuning. Additionally, we present a Bayesian method for experimental optimization of the ion optics, and show that it validates the nominal theoretical ion-optical settings of the device, and improves the mass separation by 32% for some beams.

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Section: I2 Traditional Tuning Methodsmentioning

confidence: 99%

Online Bayesian Optimization for a Recoil Mass Separator

Miskovich,

Montes,

Berg

et al. 2022

Preprint

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“…On the experimental side, new accelerator laboratories deep underground (CASPAR in the US [100], LUNA-MV in Italy [9,16,101,102], and JUNA in China [103]) and novel approaches in above-ground facilities have greatly increased the sensitivity of direct reaction-rate measurements. The latter include the use of recoil separators such as ERNA at INFN/Naples [104], St. George at the University of Notre Dame [105], and DRAGON at TRIUMF [106,107]; as well as new detector technologies such as the use of high-resolution silicon detector arrays [108] or active targets that track individual reaction products at TUNL's HIγS [109], quasi-spectroscopic neutron detectors [110],…”

Section: How Did We Get Here?mentioning

confidence: 99%

Horizons: Nuclear Astrophysics in the 2020s and Beyond

Schatz,

Reyes,

Best

et al. 2022

Preprint

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Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the chemical elements. This white paper summarizes progress and status of the field, the new open questions that have emerged, and the tremendous scientific opportunities that have opened up with major advances in capabilities across an ever growing number of disciplines and subfields that need to be integrated. We take a holistic view of the field discussing the unique challenges and opportunities in nuclear astrophysics in regards to science, diversity, education, and the interdisciplinarity and breadth of the field. Clearly nuclear astrophysics is a dynamic field with a bright future that is entering a new era of discovery opportunities.

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“…An experimental demonstration of the energy acceptance at 0 • is presented in [201]. Measurements at larger angles yielded a more limited acceptance of θ = ±30 mrad and ∆E/E = ±4%.…”

Section: Accepted Manuscript Maximize Transmissionmentioning

confidence: 99%

The status and future of direct nuclear reaction measurements for stellar burning

Aliotta¹,

Buompane²,

Couder³

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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The study of stellar burning began just over 100 years ago. Nonetheless, we do not yet have a detailed picture of the nucleosynthesis within stars and how nucleosynthesis impacts stellar structure and the remnants of stellar evolution. Achieving this understanding will require precise direct measurements of the nuclear reactions involved. This report summarizes the status of direct measurements for stellar burning, focusing on developments of the last couple of decades, and offering a prospectus of near-future developments.

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Energy acceptance of the St. George recoil separator

Cited by 10 publications

References 21 publications

Online Bayesian Optimization for a Recoil Mass Separator

Online Bayesian Optimization for a Recoil Mass Separator

Horizons: Nuclear Astrophysics in the 2020s and Beyond

The status and future of direct nuclear reaction measurements for stellar burning

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