Transverse bunch-by-bunch feedback system for time-resolved experiments at PLS-II

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Jaeyu Lee ◽  
T. Nakamura ◽  
K. Kobayashi ◽  
D.-T. Kim ◽  
T. Ha ◽  
...  
Keyword(s):  
Feedback System ◽  
Feedback Loops ◽  
Two Dimensional ◽  
Digital Converter ◽  
Time Resolved ◽  
Analog To Digital ◽  
One Dimensional ◽  
Measurement Function ◽  
Pohang Light Source ◽  
Fill Pattern

A description of the upgraded bunch-by-bunch feedback system for time-resolved experiments at Pohang Light Source II (PLS-II) is provided. The bunch-by-bunch feedback system has been upgraded to increase the single-bunch current in the hybrid fill pattern of the PLS-II facility. The project is part of the SPring-8 and PLS-II collaboration. The main features of the upgrade are to employ a single 500 MHz analog-to-digital converter (ADC) instead of the previous four 125 MHz interleaved ADCs for 500 MHz rate, to replace a single-loop two-dimensional feedback with two independent one-dimensional feedback loops, to implement the tune measurement function with a single bunch, and mainly to implement single-bunch and stretcher control. The realization of a 400 mA hybrid fill pattern including a 10 mA single bunch demonstrates the precision of the upgraded bunch-by-bunch feedback system.

An Effective CS-BP Algorithm for 2-D DOA Estimation

2011 ◽  
Vol 128-129 ◽  
pp. 62-65
Author(s):  
Yu Yan An ◽  
Sen Sen Bai
Keyword(s):  
Frequency Modulation ◽  
Sampling Rate ◽  
Doa Estimation ◽  
Bp Algorithm ◽  
Basis Pursuit ◽  
Two Dimensional ◽  
Digital Converter ◽  
Analog To Digital ◽  
High Sampling Rate ◽  
Simulation Results

The bandwidth of the direction of arrival (DOA) estimation requires high sampling rate which extends the current analog to digital converter capacity. The paper presents an effective basis pursuit (BP) algorithm based on compressive sensing (CS) signals, which is called CS-BP algorithm, for two-dimensional (2-D) DOA estimation of Linear Frequency Modulation (LFM ). The simulation results verified that the method can effectively reduce the sampling data, and improve DOA estimation performance and efficiency.

Crystal structure and luminescent properties of novel coordination polymers constructed with bifurandicarboxylic acid

2017 ◽  
Vol 73 (4) ◽  
pp. 715-721 ◽  
Author(s):  
Xianyu Huang ◽  
Daoliang Chen ◽  
Mingrui He ◽  
Jianfeng Li ◽  
Jiawei Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dicarboxylic Acid ◽  
Coordination Polymers ◽  
Luminescent Properties ◽  
Crystallographic Analysis ◽  
Spectroscopic Measurement ◽  
Molecular Structures ◽  
Two Dimensional ◽  
Time Resolved ◽  
One Dimensional

Four novel coordination polymers (CPs) assembled with [2,2′-bifuran]-5,5′-dicarboxylic acid (H2L) and metal ions ZnII, CdIIor CoIIhave been successfully synthesized. Their molecular structures have been determined to be Zn(L)(H2O)2(1), [Zn(L)(DMF)]2(2), [Cd(L)(EtOH)(DMF)2]2(3) and Co(L)(H2O)4·(H2O)2(4) by crystallographic analysis. It is found that (2) exhibits a two-dimensional infinite framework, whereas the others exhibit a one-dimensional framework. Both (2) and (3) exhibit ligand-based emission which is blue-shifted compared with the emission from the H2Lligand. Time-resolved spectroscopic measurement reveals that the complexes exhibit a similar lifetime with that of the ligand, which confirms that the emission of the complexes originates from the ligand.

scholarly journals Energy-Dependent Time-Resolved Photoluminescence of Self-Catalyzed InN Nanocolumns

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 737
Author(s):  
Fang-I Lai ◽  
Jui-Fu Yang ◽  
Wei-Chun Chen ◽  
Dan-Hua Hsieh ◽  
Woei-Tyng Lin ◽  
...  
Keyword(s):  
Activation Energy ◽  
Carrier Dynamics ◽  
Nitrogen Vacancy ◽  
Two Dimensional ◽  
Time Resolved ◽  
One Dimensional ◽  
Lifetime Analysis ◽  
Energy Dependent ◽  
Time Resolved Photoluminescence ◽  
Formation Energies

In this study, we report the optical properties and carrier dynamics of different surface dimensionality n-type wurtzite InN with various carrier concentrations using photoluminescence (PL) and an energy-dependent, time-resolved photoluminescence (ED-TRPL) analysis. Experimental results indicated that the InN morphology can be controlled by the growth temperature, from one-dimensional (1D) nanorods to two-dimensional (2D) films. Moreover, donor-like nitrogen vacancy (VN) is responsible for the increase in carrier concentration due to the lowest formation energies in the n-type InN samples. The PL results also reveal that the energies of emission peaks are higher in the InN samples with 2D features than that with 1D features. These anomalous transitions are explained as the recombination of Mahan excitons and localized holes, and further proved by a theoretical model, activation energy and photon energy-dependent lifetime analysis.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

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