AUTHENTIC TEACHING IN STEM EDUCATION - factors for success

Teaching for authentic learning is described in literature as motivating. Therefore, some schools in Sweden profile their education as authentic and some teachers strive for such teaching. During 2022, in a case study, we followed teachers and students in grade three with an age of 17-18 years, in a technology programme at a secondary school with aim to explore specific patterns in characteristics in teaching for authentic learning.  The result shows that teaching in a technology programme in an upper secondary school can be done with characteristics related to theories. Some patterns are appearing as enabler of authentic teaching. Firstly, it seems to be important to start early with authentic activities when the students begin their first year. Secondly, the teachers must let the planning, teaching "go out of control", likewise the assessment. The teachers have the role as engaging coworkers and the authentic teaching is highly explained by the school leadership and their contacts, competence, acceptance, and safety. During 2023 we make a follow up study with a broader participation. Data is collected during interviews with six teachers in different schools, both primary and  secondary schools. All teachers have participated in specific courses and are involved in projects dealing with teaching about space in STEM, with an authentic approach. The interviews will be analysed both related to a category system based on theories about authentic learning and more thematic, with aim to explore what pattern appears as enabler of authentic teaching. In this follow up study we have even more focus on what makes it possible to teach for authentic learning

Technology Education Is Important for Achieving Sustainable Development

In 2015 all 193 United Nations Member States agreed on 2030 Agenda for Sustainable Development with its 17 Sustainable Development Goals (SDGs) with the purpose to end poverty, ensure prosperity, and protect the planet. Technology and sustainable development are intertwined. The term "double-edged sword" has often been used to describe technology, as it can be both helpful and harmful. But to what extent is technology significant for sustainable development and what content can technology education have in relation to sustainable development? This study examines what technology content can be discerned in the sustainable development goals, SDGs, in order to detect possible content for technology education. The 17 SDGs include 169 targets since every SDG are defined with "Outcome targets" and "means of implementation targets". All 169 SDGs targets were analyzed through content analysis. A category system was developed from the definition of technology by Rossouw et.al (2010) and DiGironimos’s (2011)  to discern technology content in the SDGs. The results show that the achievement of each and every 17 Sustainable Development Goals in one way or another relies on our use of technology and our development of technology. Teaching with a sustainability perspective creates meaningful content for technology education, where current news and topics can be a starting point. Such teaching can provide students with necessary knowledge towards making well-grounded decisions based on facts, as both consumers and global citizens

Playing with the Sun: A Virtual Physics Experience for Nuclear Fusion Experimentation and Learning

Nuclear fusion has the potential to become an important energy source in the future, so we propose a virtual physics experience for learning about nuclear fusion and plasma physics with an interactive fusion experiment, and then placing the user inside the experiment and letting them run and control this. Implemented using Unreal Engine 4, users can manipulate parameters of the experiment in real-time with immediate visual results in the form of the shape and colour glow of the virtual plasma, resembling that of a real plasma

Power requirements for electron cyclotron current drive and ion cyclotron resonance heating for sawtooth control in ITER

13MW of electron cyclotron current drive (ECCD) power deposited inside the q = 1 surface is likely to reduce the sawtooth period in ITER baseline scenario below the level empirically predicted to trigger neo-classical tearing modes (NTMs). However, since the ECCD control scheme is solely predicated upon changing the local magnetic shear, it is prudent to plan to use a complementary scheme which directly decreases the potential energy of the kink mode in order to reduce the sawtooth period. In the event that the natural sawtooth period is longer than expected, due to enhanced alpha particle stabilisation for instance, this ancillary sawtooth control can be provided from > 10MW of ion cyclotron resonance heating (ICRH) power with a resonance just inside the q = 1 surface. Both ECCD and ICRH control schemes would benefit greatly from active feedback of the deposition with respect to the rational surface. If the q = 1 surface can be maintained closer to the magnetic axis, the efficacy of ECCD and ICRH schemes significantly increases, the negative effect on the fusion gain is reduced, and off-axis negative-ion neutral beam injection (NNBI) can also be considered for sawtooth control. Consequently, schemes to reduce the q = 1 radius are highly desirable, such as early heating to delay the current penetration and, of course, active sawtooth destabilisation to mediate small frequent sawteeth and retain a small q = 1 radius.Comment: 29 pages, 16 figure

Real-time control of divertor detachment in H-mode with impurity seeding using Langmuir probe feedback in JET-ITER-like wall

Burning plasmas with 500 MW of fusion power on ITER will rely on partially detached divertor operation to keep target heat loads at manageable levels. Such divertor regimes will be maintained by a real-time control system using the seeding of radiative impurities like nitrogen (N), neon or argon as actuator and one or more diagnostic signals as sensors. Recently, real-time control of divertor detachment has been successfully achieved in Type I ELMy H-mode JETITER-like wall discharges by using saturation current (Isat) measurements from divertor Langmuir probes as feedback signals to control the level of N seeding. The degree of divertor detachment is calculated in real-time by comparing the outer target peak Isat measurements to the peak Isat value at the roll-over in order to control the opening of the N injection valve. Real-time control of detachment has been achieved in both fixed and swept strike point experiments. The system has been progressively improved and can now automatically drive the divertor conditions from attached through high recycling and roll-over down to a user-defined level of detachment. Such a demonstration is a successful proof of principle in the context of future operation on ITER which will be extensively equipped with divertor target probes

Depinning of kinks in a Josephson-junction ratchet array

We have measured the depinning of trapped kinks in a ratchet potential using a fabricated circular array of Josephson junctions. Our ratchet system consists of a parallel array of junctions with alternating cell inductances and junctions areas. We have compared this ratchet array with other circular arrays. We find experimentally and numerically that the depinning current depends on the direction of the applied current in our ratchet ring. We also find other properties of the depinning current versus applied field, such as a long period and a lack of reflection symmetry, which we can explain analytically.Comment: to be published in PR

A new sawtooth control mechanism relying on toroidally propagating ion cyclotron resonance frequency waves: Theory and Joint European Torus tokamak experimental evidence

The sawtooth control mechanism in plasmas employing toroidally propagating ion cyclotron resonance waves is extended. The asymmetrically distributed energetic passing ions are shown to modify the ideal internal kink mode when the position of the minority ion cyclotron resonance resides within a narrow region close to the q=1 surface. An analytical treatment of the internal kink mode in the presence of model distribution function with parallel velocity asymmetry is developed. The fast ion mechanism explains the strong sensitivity of sawteeth to resonance position, and moreover is consistent with dedicated Joint European Torus [F. Romanelli, Nucl. Fusion 49, 104006 (2009)] experiments which controlled sawteeth despite negligible current drive

Minority and mode conversion heating in (3He)-H JET plasma

Radio frequency (RF) heating experiments have recently been conducted in JET (He-3)-H plasmas. This type of plasmas will be used in ITER's non-activated operation phase. Whereas a companion paper in this same PPCF issue will discuss the RF heating scenario's at half the nominal magnetic field, this paper documents the heating performance in (He-3)-H plasmas at full field, with fundamental cyclotron heating of He-3 as the only possible ion heating scheme in view of the foreseen ITER antenna frequency bandwidth. Dominant electron heating with global heating efficiencies between 30% and 70% depending on the He-3 concentration were observed and mode conversion (MC) heating proved to be as efficient as He-3 minority heating. The unwanted presence of both He-4 and D in the discharges gave rise to 2 MC layers rather than a single one. This together with the fact that the location of the high-field side fast wave (FW) cutoff is a sensitive function of the parallel wave number and that one of the locations of the wave confluences critically depends on the He-3 concentration made the interpretation of the results, although more complex, very interesting: three regimes could be distinguished as a function of X[He-3]: (i) a regime at low concentration (X[He-3] < 1.8%) at which ion cyclotron resonance frequency (ICRF) heating is efficient, (ii) a regime at intermediate concentrations (1.8 < X[He-3] < 5%) in which the RF performance is degrading and ultimately becoming very poor, and finally (iii) a good heating regime at He-3 concentrations beyond 6%. In this latter regime, the heating efficiency did not critically depend on the actual concentration while at lower concentrations (X[He-3] < 4%) a bigger excursion in heating efficiency is observed and the estimates differ somewhat from shot to shot, also depending on whether local or global signals are chosen for the analysis. The different dynamics at the various concentrations can be traced back to the presence of 2 MC layers and their associated FW cutoffs residing inside the plasma at low He-3 concentration. One of these layers is approaching and crossing the low-field side plasma edge when 1.8 < X[He-3] < 5%. Adopting a minimization procedure to correlate the MC positions with the plasma composition reveals that the different behaviors observed are due to contamination of the plasma. Wave modeling not only supports this interpretation but also shows that moderate concentrations of D-like species significantly alter the overall wave behavior in He-3-H plasmas. Whereas numerical modeling yields quantitative information on the heating efficiency, analytical work gives a good description of the dominant underlying wave interaction physics