Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session D02: Extreme BeamsInvited Live
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Sponsoring Units: DPB Chair: Sergei Nagaitsev, Fermilab Room: Washington 1 |
Saturday, April 18, 2020 3:30PM - 4:06PM Live |
D02.00001: Bright X-Ray and Gamma Sources From Self-Modulated Laser Wakefield Acceleration Invited Speaker: Felicie Albert This presentation will discuss the development of x-ray and gamma-ray sources based on laser-wakefield acceleration (LWFA) in the self-modulated regime. These sources are developed for probing high energy density (HED) science experiments at large-scale laser facilities. We will present recent experiments on the production of LWFA-based radiation, with photon energies from a few keV to a few MeV, using picosecond laser pulses. At the Titan laser (LLNL, 150 J, ps), we demonstrated evidence of betatron, Compton scattering, and bremsstrahlung emission in the self-modulated regime of laser wakefield acceleration (SMLWFA). For each radiation generation mechanism, we will go over detailed experimental properties and characterization of the sources, as well as supporting Particle In Cell simulations. We will also discuss the results of recent shots conducted with OMEGA-EP (LLE, University of Rochester) and the National Ignition Facility’s Advanced Radiographic Capability (LLNL), where we have demonstrated electron acceleration up to a few 100’s MeV energies for the development of future particle and x-ray probe platforms at these facilities. [Preview Abstract] |
Saturday, April 18, 2020 4:06PM - 4:42PM Live |
D02.00002: Cold ion beams in a storage ring as quantum computers. Invited Speaker: Timur Shaftan One of the promising directions in Quantum Computers (QC) is based on using ion traps. In a modern QC, several tens of ions are collected in a small electromagnetic trap, with their motion cooled down to micro K temperature level, leading to entanglement of their quantum states, controlled by the laser and RF fields. These ions become qubits and are used to run quantum computations at unprecedent rate using specialized codes (one example is QuTip, Quantum Toolbox in Python, \underline {http://qutip.org/}). I will discuss a concept of a QC, which holds a potential to support much higher capacity$^{\mathrm{\thinspace }}$of qubits as compared with the state-of-the-art devices on Paul traps. The idea is to use crystalline beams of ions in a storage ring as the medium for qubits. The crystalline beams have been demonstrated in accelerators since 1980s, when particles, being cooled, formed a revolving crystalline-like structure. Comparing this concept with the QC on a conventional ion trap, one might consider expansion of the QC to a small storage ring with high qubit capacity. The latter is important for evolution of the QC capabilities, including the processing power and robustness against errors due to decoherence. While it is very early to discuss a specific design of the QC on a storage ring, I will go over the concept and a few challenges that require proof-of-principal experiments, so that some basic aspects of this interesting concept are validated. [Preview Abstract] |
Saturday, April 18, 2020 4:42PM - 5:18PM Live |
D02.00003: FACET-II: Unprecedented Beam Properties Invited Speaker: Vitaly Yakimenko It is widely recognized that current designs for energy frontier colliders are pushing the envelope of affordability. They are expensive to construct and operate due to the high beam power necessary to achieve the required luminosity. Reduction in beam power without sacrificing luminosity and physics potential is only possible through tighter focusing of the colliding beams. In current designs, beamstrahlung radiation prevents further tightening of the beam focus in lepton colliders. Beamstrahlung is the fundamental process of synchrotron radiation as particles bend in the electromagnetic fields of the opposing colliding bunch. Beamstrahlung radiation both smears out the energy spectrum and produces an unwanted background source for the physics detectors. Both of these effects significantly degrade the quality of physics measurements possible. These effects become more of a challenge with higher collision energies. This obstacle can be effectively mitigated by longitudinally compressing the bunches to the extent that the radiation probability becomes small. The bunch length range to achieve this is of the order of 100nm depending on colliding beam energy [[i],[ii]]. Suppressed beamstrahlung enables a reduction of the horizontal beam size by a factor of 100 compared to existing designs and corresponding reduction in beam power, while maintaining luminosity. Further, this strategy prevents degradation of the energy spectrum, so a greater fraction of this luminosity is close to the peak collision energy – a key factor for lepton collision physics. The expected performance of the FACET-II facility at SLAC National Accelerator Laboratory allows us to study beam compression within a factor of four of the aforementioned goal at higher than required bunch charge. [i] V. Yakimenko et.al. Phys. Rev. Lett. 122, 190404, 2019. [ii] G. White and V. Yakimenko, Ultra-Short-Z Linear Collider Parameters, Workshop on Future Linear Colliders (LCWS2018), Arlington, Texas, 22-26 October 2018. arXiv:1811.11782v1 [Preview Abstract] |
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