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We develop a method to reconstruct the primordial power spectrum, P(k), using both temperature and polarisation data from the joint analysis of a number of Cosmic Microwave Background (CMB) observations. The method is an extension of the…

Cosmology and Nongalactic Astrophysics · Physics 2009-07-22 Gavin Nicholson , Carlo R. Contaldi

Numerous applications in the extreme field science are possible with circularly polarized high peak power ultrashort pulses. Commonly used quarter wave plates are not applicable here, while multi-mirror schemes are very complicated. We…

Plasma Physics · Physics 2024-07-30 E. M. Starodubtseva , I. N. Tsymbalov , D. A. Gorlova , K. A. Ivanov , A. B. Savel'ev

Lowering the noise level of short pulse lasers has been a long-standing effort for decades. Modeling the noise performance plays a crucial role in isolating the noise sources and reducing them. Modeling to date has either used analytical or…

Applied Physics · Physics 2018-10-17 Shaokang Wang , Thomas F. Carruthers , Curtis R. Menyuk

A linear regression algorithm is applied to a digital-supermode distributed Bragg reflector laser to optimise wavelength switching times. The algorithm uses the output of a digital coherent receiver as feedback to update the pre-emphasis…

Signal Processing · Electrical Eng. & Systems 2020-04-22 Thomas Gerard , Hubert Dzieciol , Joshua Benjamin , Kari Clark , Hugh Williams , Benn Thomsen , Domaniç Lavery , Polina Bayvel

We present the process of ion acceleration using ultra-thin foils irradiated by elliptically polarized, high-intensity laser pulses. Recently, efficient generation of monoenergetic ion beams was introduced using the concept of laser-ion…

Plasma Physics · Physics 2024-11-12 Roopendra Singh Rajawat , Tianhong Wang , V. Khudik , G. Shvets

Bilevel optimization problems can be used to represent the collaborative interaction between a power system and grid-connected entities, called the followers, such as data centers. Most existing approaches assume that such followers'…

Systems and Control · Electrical Eng. & Systems 2022-02-09 Yang Liu , Yu Weng , Rufan Yang , Quoc-Tuan Tran , Hung D. Nguyen

Two approaches to calculations' minimization in High Energy Physics are considered. The first one is the method of covariant calculations for the amplitudes of processes with polarized Dirac particles. The second one connects with the…

High Energy Physics - Phenomenology · Physics 2007-05-23 Alexander L. Bondarev

We propose a scheme to overcome the great challenge of polarization loss in spin-polarized ion acceleration. When a petawatt laser pulse penetrates through a compound plasma target consisting of a double layer slab and prepolarized hydrogen…

Plasma Physics · Physics 2020-11-24 Zheng Gong , Yinren Shou , Yuhui Tang , Xueqing Yan

The demand for precision predictions in the field of high energy physics has dramatically increased over recent years. Experiments conducted at the LHC, as well as precision measurements at the intensity frontier such as Belle II require…

High Energy Physics - Phenomenology · Physics 2022-09-28 Marvin Gerlach , Florian Herren , Martin Lang

Fine-grained power estimation in multicore Systems on Chips (SoCs) is crucial for efficient thermal management. BPI (Blind Power Identification) is a recent approach that determines the power consumption of different cores and the thermal…

Performance · Computer Science 2024-10-29 Mohamed R. Elshamy , Mehdi Elahi , Ahmad Patooghy , Abdel-Hameed A. Badawy

Linearized models of power systems are often desirable to formulate tractable control and optimization problems that still reflect real-world physics adequately under various operating conditions. In this paper, we propose an approach that…

Optimization and Control · Mathematics 2018-05-28 Marc Hohmann , Joseph Warrington , John Lygeros

In this paper, we propose a general algorithmic framework to solve a class of optimization problems on the product of complex Stiefel manifolds based on the matrix polar decomposition. We establish the weak convergence, global convergence…

Numerical Analysis · Mathematics 2020-06-16 Jianze Li , Shuzhong Zhang

This short paper describes a numerical method for optimising the conservative confidence bound on the reliability of a system based on tests of its individual components. This is an alternative to the algorithmic approaches identified in…

Software Engineering · Computer Science 2022-02-01 Peter Bishop , Andrey Povyakalo

Polarimetry with permille-level precision is essential for future electron-positron linear colliders. Compton polarimeters can reach negligible statistical uncertainties within seconds of measurement time. The dominating systematic…

Instrumentation and Detectors · Physics 2016-02-17 Benedikt Vormwald , Jenny List , Annika Vauth

Current state-of-the-art discrete optimization methods struggle behind when it comes to challenging contrast-enhancing discrete energies (i.e., favoring different labels for neighboring variables). This work suggests a multiscale approach…

Computer Vision and Pattern Recognition · Computer Science 2012-11-05 Shai Bagon , Meirav Galun

We demonstrate harmonic mode-locking in a semiconductor VCSEL using polarization-controlled delayed feedback. By integrating a rotatable $\lambda$/2-plate within an external cavity, we achieve precise control over pulse multiplicity and…

Optics · Physics 2025-06-19 T. Wang , Y. Ma , Z. Li , Y. Li , Z. Tu , Y. Zhang , G. Xu , S. Baland , S. Xiang , Y. Hao

This paper describes the demonstration of linearly polarized picosecond pulse shaping with variable profiles including symmetric and non-symmetric intensity distributions. Important characteristics such as stability and transmission were…

Optics · Physics 2019-01-21 Fangming Liu , Senlin Huang , Kexin Liu , Shukui Zhang

Tensor processing is the cornerstone of modern technological advancements, powering critical applications in data analytics and artificial intelligence. While optical computing offers exceptional advantages in bandwidth, parallelism, and…

Integrated modelocked lasers with high power are of utmost importance for next generation optical systems that can be field-deployable and mass produced. Here we study fully integrated modelocked laser designs that have the potential to…

Optics · Physics 2020-08-26 Neetesh Singh , Erich Ippen , Franz X. Kärtner

The use of explicit particle-in-cell (PIC) method for relativistic plasma simulations is restricted by numerical heating and instabilities that may significantly constrain the choice of time and space steps. To partially eliminate these…

Plasma Physics · Physics 2024-02-12 Arkady Gonoskov