bluuebunny/crossref_metadata_2025_split huggingface dataset:
Challenges and tolerances for a compact and hybrid ultrafast X-ray pulse source based on RF and THz technologies
Authors: Vinatier T , Assmann R W , Dorda U , Lemery F , Marchetti B 
Published: September 2020

Abstract
We present an in-depth tolerance study and investigation of the main challenges towards the realization of a hybrid compact ultrafast (fs to sub-fs) X-ray pulse source based on the combination of a conventional S-band gun as electron source and a THz-driven dielectric-loaded waveguide as post-acceleration and compression structure. This study allows us determining which bunch properties are the most affected, and in which proportion, for variations of the parameters of all the beamline elements compared to their nominal values. This leads to a definition of tolerances for the misalignments of the elements and the jitter of their parameters, which are compared to the state-of-the-art in terms of alignment precision and stability of operation parameters. The most challenging aspects towards the realization of the proposed source, including THz generation and manufacturing of the dielectric-loaded waveguide, are finally summarized and discussed.
Optimization of the arc compressor performance in the MariX free electron laser
Authors: Conti M Rossetti , Bacci A , Rossi A R , Perillo V , Serafini L 
Published: September 2020

Abstract
The MariX FEL is a compact GeV-class X-ray source exploiting a two-pass two-way acceleration in a Super-Conducting linac operated in continuous wave mode. A key component of this peculiar machine layout is the Bubble Arc Compressor (BAC), a 300 m long beamline consisting of 14 “Double Bend Achromat” cells and a bidirectional quadrupole focusing channel, which allows the beam to make a U-turn while it is being compressed to greatly increase its brightness and peak current.
In this paper we present the performance of the BAC of MariX and the solutions we adopted to solve the main issues that the beam dynamics encounters in a line of this kind. We show the beam dynamics in the BAC matching line which is designed to operate on beams propagating in both directions, considering the anti-symmetric quadrupole focusing behavior. We study the Coherent Synchrotron Radiation (CSR) emission in the BAC showing a scheme that preserves the low emittance granting also a linear compression in presence of strong CSR effects. Lastly, we present a strategy to correct the residual dispersion-based beam tilt that is introduced by the CSR kick and would otherwise spoil the FEL emission. Further, the projected emittance is minimized cancelling the dispersive contributions.
High intensity laser hybrid guiding for electron acceleration
Authors: Kim Artem , Maynard Gilles , Cros Brigitte 
Published: September 2020

Abstract
Controlled guiding of laser pulses at relativistic intensities in plasmas over distances exceeding the diffraction length is a crucial requirement of a Laser Plasma Accelerator Stage (LPAS) for achieving high quality electron beams. A hybrid guiding scheme is proposed using a dielectric capillary tube, inside which a plasma channel is generated. A high intensity laser (I = 4.3x1018 W/cm2) focused at the entrance of this structure can be efficiently guided by the combined refraction of this channel and reflection at capillary walls. The efficiency of this guiding scheme as a LPAS has been investigated through numerical simulations of a 10 pC electrons beam injected at 150 MeV and accelerated up to 1.9 GeV inside a plasma channel of density 1.5x1017e.cm−3 and of 15 cm length.
Diagnostics for Electron Pulse Trains at SwissFEL Obtained by Energy Modulation in a Laser-Driven Dielectric Structure
Authors: Hermann Benedikt , Bettoni Simona , Egenolf Thilo , Feurer Thomas , Frei Franziska , Niedermayer Uwe , Prat Eduard , Ischebeck Rasmus 
Published: September 2020

AbstractElectron pulse trains with sub-femtosecond spike length offer novel possibilities to ultra-fast pump-probe experiments in free-electron lasers. The pulse train can be generated by an energy modulation which is converted to temporal bunching in a magnetic chicane. The source of the energy modulation is typically a resonant interaction with a co-propagating laser in a wiggler magnet. Alternatively, the modulation can be obtained by a dielectric laser accelerator (DLA). The implementation of the DLA modulation scheme at SwissFEL would be enabled by using the experimental chamber installed in the framework of the Accelerator-on-a-Chip International Program (ACHIP) and a magnetic chicane placed afterwards. In this contribution, we will focus on electron beam diagnostics for the DLA-modulated and compressed electron bunch train. Our simulation results predict that measuring the energy spread of the modulated beam and coherent diffraction radiation emitted from a foil with a hole provides a precise tool to characterize and optimize the laser-electron modulation. An absolute measurement of the longitudinal phase-space with a temporal rms-resolution of 350 as is possible with the planned X-band transverse deflecting cavity in Athos.
Numerical modelling of chromatic effects on axicon-focused beams used to generate HOFI plasma channels
Authors: Ross A J , Alejo A , von Boetticher A , Cowley J , Holloway J , Jonnerby J , Picksley A , Walczak R , Hooker S M 
Published: September 2020

Abstract
Hydrodynamic optical-field-ionised (HOFI) plasma channels promise a route towards high repetition-rate, metre-scale stages for future laser plasma accelerators. These channels are formed by hydrodynamic expansion of a plasma column produced by optical field ionisation at the focus of a laser, typically from an axicon lens. Since the laser pulses used to generate the initial plasma column are of sub-picosecond duration, chromatic effects in the axicon lens could be important. In this paper we assess these effects using a numerical propagation code. The code is validated using analytical formulae and experimental data. For the parameter range investigated, dispersive effects are found to be of minor importance, reducing the peak on-axis intensity in the focal region by approximately 10%.
Summary of WG6: Theory and simulations
Authors: Silva T , Massimo F , Vieira J 
Published: September 2020

Abstract
The presentations of working group 6 (theory and simulations) of the fourth edition of the European Advanced Accelerator Workshop presented new ideas for experimental schemes, analytical models, and updates on well-known Particle in Cell codes. New schemes for improving electron beam quality, positron acceleration, ion acceleration, and radiation generation were proposed. Recently developed features of several Particle in Cell codes were also reported.
Single Domain Multiple Decompositions for Particle-in-Cell simulations
Authors: Derouillat J. , Beck A. 
Published: September 2020

Abstract
As a multi-purpose Particle-In-Cell (PIC) code, SMILEI gathers many different features in a single software. Combining some of them is challenging. In particular, spectral solvers and patch based load balancing have a priori non compatible requirements. This paper introduces the Single Domain Multiple Decompositions (SDMD) method in order to address this issue. To do so, different domain decompositions are used for fields and particles operations. This approach allows to keep small domains for particles, necessary for a good load balancing, while having large domains for the fields. It proves beneficial in mitigating synchronization costs and gives the opportunity to introduce more paralellism in the PIC algorithm on top of providing structures compatible with spectral solvers.
Advances in plasma-based beam dump modelling
Authors: Bonatto A , Nunes R P , Jakobsson O , Williamson B , Liang L , Xia G 
Published: September 2020

Abstract
This work presents a short review on the advances of plasma beam dump modelling since they have been first proposed. Analytical models have been derived to estimate the beam energy loss for both passive and active beam dump schemes. For the passive case in particular, tailored plasma density profiles can improve beam-energy extraction by mitigating particle re-acceleration. A semi-analytical model, consisting of the dynamics of test-particles experiencing the previously derived analytical wakefields, is under development to investigate deceleration beyond the saturation point, in the linear to the quasi-linear regime.
Toward the modeling of chains of plasma accelerator stages with WarpX
Authors: Vay J.-L. , Almgren A. , Amorim L. D. , Bell J. , Ge L. , Gott K. , Grote D. P. , Hogan M. , Huebl A. , Jambunathan R. , Lehe R. , Myers A. , Ng C. , Park J. , Rowan M. , Shapoval O. , Thévenet M. , Zhang W. , Zhao Y. , Zoni E. 
Published: September 2020

Abstract
The Particle-In-Cell code WarpX is being developed by a team of the U.S. DOE Exascale Computing Project to enable the modeling of chains of tens of plasma accelerators on exascale supercomputers, for future collider designs. The code is combining the latest algorithmic advances (e.g., boosted frame, pseudo-spectral Maxwell solvers) with mesh refinement and runs on the latest CPU and GPU architectures. An example of the application to the modeling of up to three successive muti-GeV stages is presented. The latest implementation on GPU architectures is also reported.
Critical thinking ability through experiential learning in the calculus class
Authors: Abdullah A A , Shanti W N , Sholihah D A 
Published: September 2020

Abstract
This quasi-experimental study aims to develop students’ mathematical thinking skills in calculus classes. The learning model used is experiential learning, where students develop mathematical concepts from their own experience, data obtained from Student Worksheets, observations of student activity sheets in discussions to solve problems, and draw conclusions through critical thinking processes. The results of the study show that students’ critical thinking skills that can be developed in this learning model are: interpretation, analysis, evaluation, and making conclusions. With an average score of students in the pretest and posttest is 59.55 and 73.18. Changes in pretest and posttest scores were statistically significant (p<0.05) following completion of the experiential learning program. An increase in the average value of critical thinking skills along with the increasing number of students who are categorized as very critical and critical in the hierarchy of critical thinking abilities category.
Students’ mathematical critical thinking reviewed from self-regulated learning
Authors: Susanti V D , Krisdiana I , Adamura F 
Published: September 2020

Abstract
Critical thinking is the ability to think logically, reflectively, and productively which is applied to produce a good decision. Therefore, it is necessary for mathematics learning. This study aims to analyze the students’ mathematical critical thinking in solving numerical analysis problems in terms of self-regulated learning (SRL). The subjects of this study were the seventh semester students of mathematics education at Universitas PGRI Madiun, selected using purposive sampling technique. The instrument in this study was a test for mathematical thinking analysis and a self-regulated learning questionnaire for subject selection. The results suggest that students with high and intermediate SRL are both having a good ability to make generalizations, identify and justify concepts, while students with low SRL only have a good ability to make generalizations, but performed low on the ability to identify and justify the concepts of analysing algorithm.
The ethnomathematics in making woven bamboo handicrafts of osing community in Banyuwangi, Gintangan village as geometry teaching material
Authors: Yudianto E , Susanto S , Sunardi S , Sugiarti T , Fajar F A 
Published: September 2020

Abstract
Ethnomathematics refers to the application of mathematics in cultural life. This research was intended to describe the ethnomathematics in making woven bamboo handicrafts in Gintangan village, Banyuwangi. The things obtained in this research were the changes in of geometric teaching material, covering Test Problem Package with Ethnomatematics as the topic. The type of this research was qualitative research with ethnographic approach. The data collection methods used were observation and interview. The subjects of this research consisted of 2 persons; they were foremen who made the woven bamboo handicrafts, kukusan, ereg, tenong and nyiru. Ethnomathematics emerged when the woven craftsmen carried out the activities to measure, calculate and design. When the process of measuring the thickness of the bamboo whittles came, the measurement concept was meters (m). During the process of calculating the drying time of bamboo and the amount of bamboo whittles, comparative concept of value appeared. During the design process, the concept of quadrilateral and number sequences emerged. The result of this research was geometry teaching material in the form of test package. The question of test package was pointed for the students of class VIII at middle school. The question of Test Package covered 4 C5 and 1 C6 questions
Interactive learning media based on MySQL technology in mathematics
Authors: Aliyah H , Kusmayadi T A , Fitriana L 
Published: September 2020

Abstract
Interactive learning media is one of the factors supporting success in the learning process. This study aims to develop interactive learning media based on MySQL technology and to determine the feasibility of media developed for 8th-grade students on straight line equation material. This system works by using a web application. The population in this study were all 8B grade students at MTs Negeri 7 Kediri odd semester 2019/2020. The model used in this study is the ADDIE model which includes Analysis, Design, Development, Implementation, and Evaluation. The first step is analyzing students ‘difficulties, the second step is designing an appropriate learning program, the third step is developing learning media, the fourth step is implementing learning media for students, and the last step is evaluating students’ abilities by giving tests. The results showed that the interactive learning media had fulfilled the validity, practicality, and effectiveness aspects so that the media was appropriate to be used.
Direct identification of Borobudur temple artefacts for learning flat shapes concepts
Authors: Anista R , Marsigit M 
Published: September 2020

Abstract
Understanding concepts is important in learning mathematics, one of them is learning geometry. The concept of geometry is closely related to daily life, so that introducing directly the object of geometry is expected to facilitate the understanding of geometry concepts for students. This research is a descriptive qualitative research. The purpose of this study was to determine student understanding in studying geometry by directly identifying Borobudur temple artefacts. The subjects of this study were 3 students of class VIII SMP. The instrument in this study was the researcher herself as the main instrument guided by a concept understanding test and interview guidelines based on valid and reliable tests. Data were collected through the provision of pre-test and post-test about understanding the concept of a flat figure which includes 7 indicators and accompanied by interviews as supporting data. The results showed that directly identifying the Borobudur temple artefacts can be used as an alternative to studying the concept of flat wake. The weakness of this study is that the three subjects have not been able to answer the problem in indicator 7, which is about developing sufficient requirements or necessary requirements from the concept of a flat figure. This can be a material or material that can be used as future research.
Students’ mathematical proficiency in solving calculus problems after Maple implementation
Authors: Hamid H , Angkotasan N , Jalal A , Muhtadi D , Sukirwan  
Published: September 2020

Abstract
This research aimed to analyze and explore the capability of mathematical proficiency second semester math education students of Faculty of Teacher Training and Education (FKIP) Khairun University academic year 2017/2018. In this study mathematical problems are presented in Calculus, and given the opportunity for students to understand the problems provided both from the theoretical aspects related to indicators of mathematical proficiency namely conceptual understanding, procedural fluency, strategic competence, adaptive reasoning, and productive disposition, which further uses Interactive Maple Tutor, Maple Assistant, and Show Solution commands. Students in this study can take some steps themselves, and ask Maple to take the next step. Research data were collected and analysed with a descriptive-qualitative approach of student work for each indicator of mathematical proficiency with research subject in total 128 students. The results showed that the ability of the mathematical proficiency of students of mathematics education in the medium category.
The challenge-based learning to students’ spatial mathematical ability
Authors: Susilawati Wati , Suryadi Didi 
Published: September 2020

Abstract
The low ability of students thinking in geometry requires a new perspective in creating a more challenging and better mathematics learning process. This study aims to improve mathematical spatial ability through challenge-based learning using the Quasi-Experiment Method and Non-equivalent Pretest-Posttest Control Group Design. The instruments used PAM test and spatial thinking ability test. Analysis of quantitative data used t-test, Mann–Whitney U test, and Adjusted Rank Transform, two-way ANOVA. The study conducted at a university in Bandung, Indonesia. It involved 62 prospective Madrasah Ibtidaiyah teacher candidates as samples, which categorized into two classes, 32 class B as an experimental class and 30 class A as a control class. The findings show: There is a higher increase in mathematical spatial abilities of students who obtain challenge-based learning than students who obtain expository learning based on the overall student sample and students’ initial mathematical knowledge. There was an interaction effect between type aspects (challenge-based learning and expository learning) and initial mathematical knowledge on students’ mathematical spatial abilities. Challenge-based learning can facilitate the process of conflict, discovery, social interaction, and the reflective process of students. The material is easy to understand and exciting to learn. Thus, spatial ability is better than expository learning.
Augmented Reality for Integer Learning: Investigating its potential on students’ critical thinking
Authors: Suryanti S , Arifani Y , Sutaji D 
Published: September 2020

Abstract
Research on critical thinking has been carried out by researchers. Critical thinking is one of the four skills students must have before the 21st century. In recent years Augmented Reality (AR) technology has provided opportunities by making learning more interesting, that able to visualizing mathematical objects in the real world. This research was conducted in a remote area of Bawean Island after the mathematics teachers participated in Augmented Reality-based mathematics learning media development program. The sample of the study was 95 students of 7th grade junior high school from five schools on Bawean Island. Investigation of the potential use of Augmented Reality technology to critical thinking skills, carried out by providing students with pretest and posttest critical thinking skills. Also, student responses were considered in this study. The results of our analysis, the ability of student’s critical thinking skills after the use of AR-based media is better than before the use of AR-based media, and students give a very good response to the use of AR-based media in this integer learning.
Analysis of the government district RMTDP using FMD and dematel method
Authors: Suhaedi D , Ishfahani A A , Harahap E H , Fajar M Y , Rohaeni O 
Published: September 2020

Abstract
Indonesia is one of the developing countries. Development is carried out in national, provincial, and district areas. Generally, development is done through a plan. Development planning consists of several strategic issues. These strategic issues describe the state of an area, specifically the area of a district. The purpose of this study is to analyze nine strategic issues of the Regional Medium-Term Development Plan (RMTDP) of the Government District in 2016-2021. Each strategic issue includes seven criterion values. Data from each strategic issue is collected using a questionnaire created by the institution. Data on these strategic issues are formulated in the form of a mathematical model, namely multiple criteria decision making (MCDM). Analysis of the MCDM data is performed using the Fuzzy Maximizing Deviation (FMD) and DEMATEL methods. The results of data analysis show that issues that should receive priority attention are still limited to basic environmental facilities and infrastructure, and the most dominant criteria for these nine issues are the tasks and responsibilities of the regional government.
Understanding primary school children’s learning on addition of fractions
Authors: Abbas Nor’Arifahwati Haji , Shahrill Masitah , Indra Prahmana Rully Charitas 
Published: September 2020

Abstract
Fractions are universally known to be difficult to learn. Learning basic fractions may not be sustainable if one is to apply it to more advanced mathematical content knowledge as it is interlinked with other mathematics topics. In the effort to understand how children grasp the learning of fractions additions, a study was carried out with a random sampling of Years 4, 5 and 6 children in Brunei Darussalam. The research participants consisted of 33 children who are currently studying at government and private primary schools in Brunei. A pen-and-paper self-designed test was used as an instrument in collecting the data. The quantitative data was analysed by using a descriptive analysis method. The overall reliability of the self-designed tests indicated that the items have relatively high internal consistency with a Cronbach alpha of .859. The findings revealed that the children’s understanding is stronger on questions with answers regarding proper fractions rather than improper fractions. This could be further explored through future studies employing a qualitative approach.
Mathematics module based on problem-based learning to improve students’ metacognition
Authors: Barokah I , Budiyono  , Saputro D R S 
Published: September 2020

AbstractLow student metacognition can be improved during the teaching and learning process. This study aims to obtain a mathematics module based on problem-based learning valid, practical, and effective. This research is development research. The development model used refers to the development model according to Budiyono. There are 3 stages in this research, namely preliminary study, product development, and product efficacy test. The population in this study was 8th-grade students of junior high school in Surakarta, Indonesia. Schools selection using a stratified cluster random sampling technique. The sample for preliminary field testing is 29 students. The sample for main field testing is 87 students. The instruments used in this study were module assessment sheets, student and teacher response questionnaires, metacognitive knowledge questionnaires, and metacognitive regulation tests. The results of this study are a mathematics module based on problem-based learning are valid based on expert judgment with very good categories, practical based on the assessment of teachers and students with very agreeable categories and effective because of increasing student metacognition after learning using mathematics module based on problem-based learning.