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200 papers

We demonstrate the Doppler laser cooling of $^{40}$Ca$^+$ ions confined in a segmented linear Paul trap in the presence of a strong quadrupolar magnetic field generated by two permanent ring magnets. Magnetic field gradients of 800 to 1600…

Atomic Physics · Physics 2023-09-08 Christian Mangeng , Yanning Yin , Richard Karl , Stefan Willitsch

We report observations of the acceleration and trapping of energetic ions and electrons between a pair of corotating interaction regions (CIRs). The event occurred in Carrington Rotation 2060. Observed at spacecraft STEREO-B, the two CIRs…

Solar and Stellar Astrophysics · Physics 2014-01-13 Z. Wu , Y. Chen , G. Li , L. L. Zhao , R. W. Ebert , M. I. Desai , G. M. Mason , B. Lavraud , L. Zhao , Y. C. -M. Liu , F. Guo , C. L. Tang , E. Landi , J. Sauvaud

We report measured rate coefficients for electron-ion recombination for Si10+ forming Si9+ and for Si9+ forming Si8+, respectively. The measurements were performed using the electron-ion merged-beams technique at a heavy-ion storage ring.…

In Fermilab's electron cooler, a 0.1A, 4.3MeV DC electron beam propagates through the 20 m cooling section, which is immersed in a weak longitudinal magnetic field. A proper adjustment of 200 dipole coils, installed in the cooling section…

Accelerator Physics · Physics 2012-08-17 Andrei Khilkevich , Lionel R. Prost , Alexander V. Shemyakin

Calorimetric measurements of AC loss and hence interstrand contact resistance (ICR), were measured on three samples of Rutherford cable wound with Cu-stabilized jelly-roll type unplated Nb3Al strand. One of the cable types was furnished…

Superconductivity · Physics 2018-07-04 M. D. Sumption , R. M. Scanlan , A. Nijhuis , E. W. Collings

This study investigates the nonlinear interactions between electrons and electron-cyclotron resonance (ECR) heating beams in magnetized, low-temperature fusion plasmas, focusing on enhancing pre-ionization efficiency. We analyse key…

Plasma Physics · Physics 2025-07-15 Tulchhi Ram , T. Wauters , P. C. de Vries , P. K. Sharma , Raju Daniel

Fundamental studies of excitation and non-linear evolution of kinetic instabilities of strongly nonequlibrium hot plasmas confined in open magnetic traps suggest new opportunities for fine-tuning of conventional electron cyclotron resonance…

Electron-ion collision spectroscopy at heavy-ion storage rings aims at precision measurements of resonance features that occur in the cross sections of electron collision processes such as electron-impact ionization of ions or electron-ion…

A previous publication has shown that the in-plane polarization (IPP) component of a polarized 0.97-GeV/c deuteron beam in the COSY storage ring may acquire a polarization half-life in excess of 1000 s through a combination of beam…

In this paper, we focus on a PIG source for producing intense H-ions inside a 9 MeV cyclotron. The properties of the PIG ion source were simulated for a variety of electric field distributions and magnetic field strengths using CST particle…

Accelerator Physics · Physics 2014-06-04 Mitra Ghergherehchi , Xiang- Jie Mu , Yeong- Heum Yeon , Jong-Wan Kim , Jong- Seo Chai

Cornell's electron/positron storage ring (CESR) was modified over a series of accelerator shutdowns beginning in May 2008, which substantially improves its capability for research and development for particle accelerators. CESR's energy…

Accelerator Physics · Physics 2015-09-02 M. G. Billing

We study the onset of electron heating in intense laser-solid interactions and its impact on the spectral quality of radiation pressure accelerated ions in both hole boring and light sail regimes. Two- and three-dimensional particle-in-cell…

Plasma Physics · Physics 2022-11-01 H. -G. Jason Chou , Anna Grassi , Siegfried H. Glenzer , Frederico Fiuza

To face the higher levels of radiation due to the 10-fold increase in integrated luminosity during the High-Luminosity LHC, the CMS detector will replace the current Calorimeter Endcap (CE) using the High-Granularity Calorimeter (HGCAL)…

We analyze the dynamics and steady state of a linear ion array when some of the ions are continuously laser cooled. We calculate the ions' local temperature measured by its position fluctuation under various trapping and cooling…

Quantum Physics · Physics 2015-11-10 Guin-Dar Lin , L. -M. Duan

The Integrable Optics Test Accelerator at Fermilab will explore beam dynamics in a ring with intense space-charge using 2.5 MeV proton beams with an incoherent tune shift approaching -0.5. We will use this machine to explore the interplay…

Accelerator Physics · Physics 2023-10-24 N. Banerjee , G. Stancari , M. K. Bossard , J. Brandt , Y-K. Kim , S. Nagaitsev

Detectors proposed for the International Linear Collider (ILC) incorporate a tungsten sampling calorimeter (`BeamCal') intended to reconstruct showers of electrons, positrons and photons that emerge from the interaction point of the…

Scanning Electron Microscopy (SEM) experiments provide detailed insights into material microstructures, enabling high-resolution imaging as well as crystallographic analysis through advanced techniques like Electron Backscatter Diffraction…

Materials Science · Physics 2024-12-05 Christina Koenig , Alice Bastos da Silva Fanta , Joerg R. Jinschek

We report ionization cross section measurements for electron impact single ionization (EISI) of Fe^11+$ forming Fe^12+ and electron impact double ionization (EIDI) of Fe^11+ forming Fe^13+. The measurements cover the center-of-mass energy…

Instrumentation and Methods for Astrophysics · Physics 2015-03-17 M. Hahn , D. Bernhardt , M. Grieser , C. Krantz , M. Lestinsky , A. Mueller , O. Novotny , R. Repnow , S. Schippers , A. Wolf , D. W. Savin

Storage rings have been employed over three decades in various kinds of nuclear and atomic physics experiments with highly charged ions. Storage ring operation and precision physics experiments benefit from the availability of beam cooling…

Nuclear Experiment · Physics 2020-10-28 Markus Steck , Yuri A. Litvinov