S. Haider
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View article: An Analytical Study of Islamic Faith and Ethics in the Context of Environmental Sustainability
An Analytical Study of Islamic Faith and Ethics in the Context of Environmental Sustainability Open
In this article, Islamicate environmental ethics are presented as a religious articulation of response to the current ecological crisis. The article posits that Islamic guidance provides a non-sectarian and spiritually articulate vision of…
View article: Islamic Education and Gender Justice: A Study of Child Engagement in the Pakistani Diaspora
Islamic Education and Gender Justice: A Study of Child Engagement in the Pakistani Diaspora Open
There is a continuing practice of childhood engagements in which marriages are arranged at a young age, a long-standing tradition among many Pakistani families that serves to maintain kinship ties. This research paper examines the impact o…
View article: Positron-Positronium Converters in Reflection and Transmission Geometry for Gravitational Experiments with Antihydrogen using Moiré Deflectometry
Positron-Positronium Converters in Reflection and Transmission Geometry for Gravitational Experiments with Antihydrogen using Moiré Deflectometry Open
In the context of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEgIS) located at CERN, positron-positronium converters with a high positron-positronium conversion efficiency have been designed in both reflection and …
View article: Laser Cooling Positronium with Broadband Laser Pulses
Laser Cooling Positronium with Broadband Laser Pulses Open
The first successful demonstration of broadband laser cooling of positronium (Ps) atoms, obtained within the AEgIS experiment at CERN, is presented here. By employing a custom-designed pulsed alexandrite laser system at 243 nm featuring lo…
View article: Mentor-Mentee relationship in Medicine: How to develop trust?
Mentor-Mentee relationship in Medicine: How to develop trust? Open
A mentor-mentee relationship, also known as a mentoring relationship, is a professional or personal partnership in which a more experienced or knowledgeable individual (the mentor) provides guidance, support, and advice to a less experienc…
View article: Robust & Optimal Predictive Current Control for Bi-Directional DC-DC Converter in Distributed Energy Storage Systems
Robust & Optimal Predictive Current Control for Bi-Directional DC-DC Converter in Distributed Energy Storage Systems Open
This article proposes the development of an optimal and robust control approach for the voltage regulation of a bi-directional DC-DC converter for its integration in battery energy storage and electric vehicle charging station applications…
View article: Adaptive Sliding Mode Control of DC–DC Buck Converter with Load Fluctuations for Renewable Energy Systems
Adaptive Sliding Mode Control of DC–DC Buck Converter with Load Fluctuations for Renewable Energy Systems Open
DC–DC converters are extensively utilized in renewable energy systems because of the flexibility in their output voltage and their good conversion efficiency. The design of an adaptive sliding mode controller is proposed in this paper for …
View article: TALOS (Total Automation of LabVIEW Operations for Science): A framework for autonomous control systems for complex experiments
TALOS (Total Automation of LabVIEW Operations for Science): A framework for autonomous control systems for complex experiments Open
Modern physics experiments are frequently very complex, relying on multiple simultaneous events to happen in order to obtain the desired result. The experiment control system plays a central role in orchestrating the measurement setup: How…
View article: Real-time antiproton annihilation vertexing with sub-micron resolution
Real-time antiproton annihilation vertexing with sub-micron resolution Open
The primary goal of the AEgIS experiment is to precisely measure the free fall of antihydrogen within Earth's gravitational field. To this end, a cold ~50K antihydrogen beam has to pass through two grids forming a moiré deflectometer befor…
View article: Positronium Laser Cooling via the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup><mml:mi>S</mml:mi><mml:mtext>−</mml:mtext><mml:msup><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup><mml:mi>P</mml:mi></mml:mrow></mml:math> Transition with a Broadband Laser Pulse
Positronium Laser Cooling via the Transition with a Broadband Laser Pulse Open
We report on laser cooling of a large fraction of positronium (Ps) in free flight by strongly saturating the 13S−23P transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnetic and…
View article: CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments
CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments Open
View article: Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse
Positronium laser cooling via the $1^3S$-$2^3P$ transition with a broadband laser pulse Open
We report on laser cooling of a large fraction of positronium (Ps) in free-flight by strongly saturating the $1^3S$-$2^3P$ transition with a broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced in a magnet…
View article: Pulsed Production of Antihydrogen in AEgIS
Pulsed Production of Antihydrogen in AEgIS Open
Low-temperature antihydrogen atoms are an effective tool to probe the validity of the fundamental laws of Physics, for example the Weak Equivalence Principle (WEP) for antimatter, and -generally speaking- it is obvious that colder atoms wi…
View article: Control system for ion Penning traps at the AEgIS experiment at CERN
Control system for ion Penning traps at the AEgIS experiment at CERN Open
The AEgIS experiment located at the Antiproton Decelerator at CERN aims to measure the gravitational fall of a cold antihydrogen pulsed beam. The precise observation of the antiatoms in the Earth gravitational field requires a controlled p…
View article: Development of a detector for inertial sensing of positronium at AEḡIS (CERN)
Development of a detector for inertial sensing of positronium at AEḡIS (CERN) Open
The primary goal of the AEgIS collaboration at CERN is to measure the gravitational acceleration on neutral antimatter. Positronium (Ps), the bound state of an electron and a positron, is a suitable candidate for a force-sensitive inertial…
View article: High-resolution MCP-TimePix3 imaging/timing detector for antimatter physics
High-resolution MCP-TimePix3 imaging/timing detector for antimatter physics Open
We present a hybrid imaging/timing detector for force sensitive inertial measurements designed for measurements on positronium, the metastable bound state of an electron and a positron, but also suitable for applications involving other lo…
View article: High-yield thermalized positronium at room temperature emitted by morphologically tuned nanochanneled silicon targets
High-yield thermalized positronium at room temperature emitted by morphologically tuned nanochanneled silicon targets Open
Nanochanneled silicon targets with high positron/positronium (Ps) conversion rate and efficient Ps cooling were produced. Morphological parameters of the nanochannels, such as their diameter and length, were adjusted to get a large fractio…
View article: Protocol for pulsed antihydrogen production in the AEḡIS apparatus
Protocol for pulsed antihydrogen production in the AEḡIS apparatus Open
The AE ḡ IS collaboration’s main goal is to measure the acceleration of antihydrogen ( ) due to gravity. The experimental scheme is to form a pulsed beam whose vertical deflection is then measured by means of a moir…
View article: Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment
Rydberg-positronium velocity and self-ionization studies in a 1T magnetic field and cryogenic environment Open
We characterized the pulsed Rydberg-positronium production inside the Antimatter Experiment: Gravity, Interferometry, Spectroscopy (AE¯gIS) apparatus in view of antihydrogen formation by means of a charge exchange reaction between cold ant…
View article: A cryogenic tracking detector for antihydrogen detection in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e454" altimg="si123.svg"><mml:mtext>AEgIS</mml:mtext></mml:math> experiment
A cryogenic tracking detector for antihydrogen detection in the experiment Open
View article: Hybrid Imaging and Timing Ps Laser Excitation Diagnostics for Pulsed Antihydrogen Production
Hybrid Imaging and Timing Ps Laser Excitation Diagnostics for Pulsed Antihydrogen Production Open
In this work we present a hybrid detection method providing simultaneous imaging and timing information suitable for fully monitoring positronium (Ps) formation, its laser excitation, and its spatial propagation for the first trials of pul…
View article: Techniques for Production and Detection of 2<sup>3</sup>S Positronium
Techniques for Production and Detection of 2<sup>3</sup>S Positronium Open
In this work, we show recent measurements of $2^{3}S$ long-lived positronium production via spontaneous decay from the 3 3P level. The possibility to tune the velocity of the $2^{3}S$ positronium, excited following this scheme, is presente…
View article: Gravity and antimatter: the AEgIS experiment at CERN
Gravity and antimatter: the AEgIS experiment at CERN Open
From the experimental point of view, very little is known about the gravitational interaction between matter and antimatter. In particular, the Weak Equivalence Principle, which is of paramount importance for the General Relativity, has no…
View article: Calibration and Equalisation of Plastic Scintillator Detectors for Antiproton Annihilation Identification Over Positron/Positronium Background
Calibration and Equalisation of Plastic Scintillator Detectors for Antiproton Annihilation Identification Over Positron/Positronium Background Open
In this contribution, the system of the external plastic scintillator slabs of the AEgIS experiment is presented. These slabs, surrounding the superconducting magnet and operating at room temperature, are read out by photomultiplier tubes …
View article: Efficient <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mspace width="0.16em"/><mml:mmultiscripts><mml:mi>S</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> positronium production by stimulated decay from the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>3</mml:mn><mml:mspace width="0.16em"/><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> level
Efficient positronium production by stimulated decay from the level Open
We investigate experimentally the possibility of enhancing the production of 2S3 positronium atoms by driving the 1S3-3P3 and 3P3-2S3 transitions, overcoming the natural branching ratio limitation of spontaneous decay from 3P3 to 2S3. The …
View article: The AEgIS experiment: towards antimatter gravity measurements
The AEgIS experiment: towards antimatter gravity measurements Open
(Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment aiming to probe the Weak Equivalence Principle of General Relativity with antimatter by studying free fall of antihydrogen in the Earth’s gravitation…
View article: A ∼100 μm-resolution position-sensitive detector for slow positronium
A ∼100 μm-resolution position-sensitive detector for slow positronium Open
View article: Velocity-selected production of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mmultiscripts><mml:mi mathvariant="normal">S</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mspace width="0.16em"/><mml:mn>3</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> metastable positronium
Velocity-selected production of metastable positronium Open
Positronium in the 2S3 metastable state exhibits a low electrical polarizability and a long lifetime (1140 ns), making it a promising candidate for interferometry experiments with a neutral matter-antimatter system. In the present work, 2S…
View article: The AEgIS experiment at CERN: Probing antimatter gravity
The AEgIS experiment at CERN: Probing antimatter gravity Open
The AE$\\overline{g}$IS experiment at CERN’s Antiproton Decelerator is set up to precisely measure the gravitational interaction between matter and antimatter. For this purpose, antihydrogen will be formed from cold antiprotons and positro…
View article: Positronium Rydberg excitation diagnostic in a 1T cryogenic environment
Positronium Rydberg excitation diagnostic in a 1T cryogenic environment Open
Forming a pulsed beam of cold antihydrogen using charge-exchange with Rydberg positronium (Ps) is the goal of the AEgIS collaboration, which aims to a first gravity measurement on neutral antimatter. Recently achieved results in Ps formati…