ASTeC

Copper supper conducting radio frequency (SRF) cavity preparation and deposition

Fellowship started: June 2017
Fellowship ending: June 2019

Sepideh got her BSc in chemistry and MSc in material science from Sharif University of Iran. Her initial career was as a technical manager in a metallurgical research centre. She gained her PhD in material science and engineering (corrosion and protection) from the University of Manchester, and followed this as a postdoctoral research associate on plasma electrolytic oxidation (PEO) on titanium.

The use of copper as a main accelerator cavity material is primarily due to lowering the cost of the cavity since high purity niobium costs around 40 times more than copper. Another important aspect is the copper thermal conductivity with respect to niobium that can be crucial in promptly transmitting the heat generated in local hot spots to the liquid helium bath. The aim of my work is a systematic study on the effect of substrate preparation to provide optimum interface quality to produce films which adhere strongly to reduce thermal contact resistance.

Important publications

1. S. Aliasghari, M. Ghorbani, P. Skeldon, H. Karami, M. Movahedi, Effect of plasma electrolytic oxidation on joining of AA 5052 aluminium alloy to polypropylene using friction stir spot welding." Surface and Coatings Technology 313 (2017) 274–281.


2. S. Aliasghari, P. Skeldon, and G. E. Thompson. "Plasma electrolytic oxidation of titanium in a phosphate/silicate electrolyte and tribological performance of the coatings." Applied Surface Science 316 (2014): 463-476.


3. S. Aliasghari, A. Němcová, J. Čížek, A. Gholinia, P. Skeldon, and G. E. Thompson. "Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate–phosphate electrolyte." Transactions of the IMF (2016).


4. S. Aliasghari, S., T. Hashimoto, P. Skeldon, and G. E. Thompson. "Effect of Chloride Ions in Plasma Electrolytic Oxidation of Titanium." ECS Electrochemistry Letters 3. (2014): C17-C20.


5. S. Aliasghari, A. Němcová, P. Skeldon, and G. E. Thompson. "Influence of coating morphology on adhesive bonding of titanium pre-treated by plasma electrolytic oxidation." Surface and Coatings Technology (2016).

Important talks

1. S. Aliasghari, M. Ghorbani, P. Davami, N. Varahram, Characterization of Mixed metal oxide on titanium coated electrode based on RuO2-TiO2-IrO2, 13th Middle East corrosion conference & exhibition, 2010, Bahrain.


2. S. Ahmadnia, S. Aliasghari, M. Ghorbani, Corrosion behaviour of plasma electrolytic oxidation coatings in simulated body fluid (SBF) at silicate and calcium phosphate electrolytes, iMAT conference, Shiraz, Iran, 2016.

UK Astronomy Technology Centre

Additive manufacturing for the next generation of astronomical components

Fellowship started: August 2016
Fellowship ending: July 2018

My research investigates the application of additive manufacturing, commonly known as 3D printing, towards light-weight space-based optical components for astronomy. The advantage of additive manufacturing is that it allows the user to build an object layer-upon-layer in a wide range of materials, which means the designer is no longer constrained by traditional machining/tooling methods. Space-based imaging systems have to overcome the Earth’s gravity in order to achieve operation and therefore light-weight optical systems are paramount to ensure the maximum photon collecting area for a given launch-weight restriction. It is hoped during the two years of the fellowship that a series of proof-of-concept additively manufactured test samples will be created. These test samples will trial a variety of additive manufacturing materials and methods and study the effect of the light-weighting structures in terms of print-through upon the optical surface. The goal is to demonstrate that additive manufacturing can be used to create research grade optical components for space-based optical systems.

orcid.org/0000-0002-0469-8288

Important publications

1. Carolyn Atkins, Charlotte Feldman, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Emmanuel Hugot, Mat Beardsley, Michael Harris, Christopher Spindloe, Simon G. Alcock, Ioana-Theodora Nistea, Christian Morawe, François Perrin, "Topological design of lightweight additively manufactured mirrors for space", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107060I (10 July 2018);
    
2. Carolyn Atkins, Charlotte Feldman, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Peter Doel, Richard Willingale, Emmanuel Hugot, "Additive manufactured x-ray optics for astronomy," Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103991G (2017/08/29);


3. Charlotte Feldman, Carolyn Atkins, David Brooks, Stephen Watson, William Cochrane, Melanie Roulet, Richard Willingale, Peter Doel, "Design and modelling of an additive manufactured thin shell for X-ray astronomy," Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 103991H (2017/09/08);

Important talks

1. Carolyn Atkins “Topological design of lightweight additively manufactured mirrors for space” 107060I, oral presentation at SPIE Astronomical Instrumentation, Austin TX, USA, June 2018
    
2. Carolyn Atkins “Additive manufacturing of x-ray optics for astronomy” 103991G, oral presentation at SPIE Optics + Photonics, San Diego, USA, August 2017


3. Carolyn Atkins “Additive manufacturing and high resolution X-ray optics”, Oral presentation at the International workshop on Astronomical X-Ray Optics (AXRO), December 2016

ISIS Neutron and Muon Source

Exploration of the aggregate structure for oligomeric surfactant by neutron scattering

Fellowship started: August 2017
Fellowship ending: August 2019

Surfactants have been widely used in cosmetics, detergents and pharmaceutical industries. These applications are always related to surfactant-lipid interactions. The interaction plays an important role in a vast field, including the activity and delivery of drugs, the regulation of cellular processes and the food digestion. The lipid-surfactant interaction helps to predict the skin irritation power of surfactant because human skin is mainly composed of lipids and proteins. The interaction of conventional single chain surfactant with lipid has been well studied to promote its practical use. However, with the growing customer requirement, novel surfactants with higher surface activity and lower CMCs are needed. Oligomeric surfactant, with three or more hydrophobic tails, should be taken into consideration due to its outstanding self-assembly properties. Therefore, the interaction of oligomeric surfactant with lipid should be considered first before practical use. In this project, with the help of SANS at ISIS, the most powerful approach to study the precious structures of surfactant aggregates, the precious aggregate structure of the oligomeric surfactants can be detected. We seek to know how different surfactant aggregates interact with lipid and this may lead some new application for oligomeric surfactant.

Important publications

1. Yao Chen, Xiulin Ji, Yuchun Han, Yilin Wang*, Self-Assembly of Oleyl Bis(2-hydroxyethyl)methyl Ammonium Bromide with Sodium Dodecyl Sulfate and Their Interactions with Zein. Langmuir 2016, 32, 8212-8221.


2. Yao Chen, Fulin Qiao, Yaxun Fan, Yuchun Han, Yilin Wang*, Interactions of Cationic/Anionic Mixed Surfactant Aggregates with Phospholipid Vesicles and Their Effects on Skin Irritation. Langmuir 2017, 33, 2760−2769. (Cover, ACS Editor’s Choice)


3. Yao Chen, Fulin Qiao, Yaxun Fan, Yuchun Han, Yilin Wang*, Interactions of Phospholipid Vesicles with Cationic and Anionic Oligomeric Surfactants. J. Phys. Chem. B 2017, 121, 7122−7132.


4. Zhou, C.; Wang, D.; Cao, M.; Chen, Y.; Liu, Z.; Wu, C.; Xu, H.; Wang, S.; Wang, Y. Self-Aggregation, Antibacterial Activity, and Mildness of Cyclodextrin/Cationic Trimeric Surfactant Complexes. ACS Appl. Mater. Interfaces 2016, 8, 30811-30823.


5. Zhang Liu, Meiwen Cao, Yao Chen, Yaxun Fan, Dong Wang, Hai Xu, Yilin Wang*, Interactions of Divalent and Trivalent Metal Counterions with Anionic Sulfonate Gemini Surfactant and Induced Aggregate Transitions in Aqueous Solution. J. Phys. Chem. B. 2016, 120, 4102-4113.

ISIS Neutron and Muon Source

Neutron scattering studies of novel multiferroic materials

Fellowship started: June 2016
Fellowship ending: May 2018

My research aims to understand the relationship between structure (both crystal and magnetic) and physical properties in novel transition metal materials with particular interests on multiferroics, frustrated magnets, low dimensional magnets and other magnetic order related novel properties. Multiferroic materials with a coexistence or cross-coupling of magnetic and ferroelectric order have attracted considerable interest both from fundamental and technological point of view. Such functionality has the potential for new technology such as energy-efficient, electrically written magnetic memories and four-logic states cell. My main task is to exploit novel multiferroics as well as to understand their mechanism based on the precise understanding of their crystal and magnetic symmetry. Diffraction techniques such as neutron and x-ray diffraction are essential techniques in investigating multiferroics since they are sensitive to both magnetic orderings and structural distortions. In the support of RIFP grant, I am able to take advantage of the advanced techniques based at RAL such as the ISIS neutron and muon source and Diamond light source to accomplish my research.

Important publications

1. “Unusual spin configuration in high-pressure synthesized perovskites ACrO₃(A=Sc, In, Tl),” Lei Ding, Pascal Manuel, Dmitry Khalyavin, Fabio Orlandi, Wei Yi, Alexei A. Belik, Physical Review B, (2017), 95, 054432.


2. “SrMGe₂O₆ (M=Mn,Co): a family of pyroxene compounds displaying multiferroicity,” Lei Ding, Claire V. Colin, Celine Darie, Pierre Bordet, J. Mater. Chem. C, (2016), 4, 4236-4245.


3. “One-dimensional short-range magnetic correlations in the magnetoelectric pyroxene CaMnGe₂O₆,” Lei Ding, Claire V. Colin, Celine Darie, J Robert, F Gay, Pierre Bordet, Physical Review B,(2016), 93, 06442.


4. “Near zero temperature coefficient of resistivity in antiperovskite Mn₃Ni₁−_xCu_xN,” Lei Ding, Cong Wang, Lihua Chu, Jun Yan, Yuanyuan Na, Qingzhen Huang, Xiaolong Chen, Applied Physics Letters, (2011), 99, 251905.


5. “Preparation and near zero thermal expansion property of Mn₃Cu_0.5A_0.5N (A=Ni,Sn)/Cu composites,” Lei Ding, Cong Wang, Yuanyuan Na, Lihua Chu, Jun Yan, Scripta Materialia, (2011), 65, 687-690.

Important talks

1. August 2017: Lei Ding, “Neutron diffraction study of multiferroic pyroxene NaFeGe₂O₆”, Oral presentation at The 15th international conference on Advanced materials. Kyoto, Japan


2. August 2015: Lei Ding, “Multiferroic and magnetoelectric properties in pyroxenes”, Oral presentation at VI European Conference on Neutron Scattering. Zaragoza, Spain


3. August 2014: Lei Ding, “Structure, magnetic and magnetoelectric effect in Ca(MnCo)Ge₂O₆ pyroxenes”, Oral presentation at Condensed Matter in Paris. Paris, France.

Diamond Light Source Ltd.

Development of time resolved pump-probe circular dichroism at B23

Fellowship started: April 2017
Fellowship ending: March 2019

Circular Dichroism (CD) is a technique whereby chiral molecules are probed by left and right circularly polarized light and the differences in absorption between the left and right polarized light are recorded. This provides information concerning the molecule and its environment and has been used for many years to probe the environment and structure of many biomolecules. In the far UV region (175-260 nm) it has been extensively utilised to probe protein secondary structure as a function of solvent, pH, temperature, pressure, detergents, and ligands whilst the near UV (250-350 nm) can be explored to investigate the structure of DNA and the ternary structure of proteins via the aromatic side chains. This fellowship will enable the development of a state-of-the-art time-resolved pump-probe facility at the B23 CD beamline at Diamond light source. A new range of experiments will be possible investigating, for example, photoactive proteins, caged ligand systems and temperature (T)-Jump experiments. These will be developed in a user friendly manner essential for reaching out to the broad UK Soft Matter and Biology communities.

Important publications

1. Time-resolved X-ray solution scattering reveals the structural photoactivation of a light-oxygen-voltage photoreceptor


2. Detection of interaction between protein trytophan residues and small or macromolecular ligands by synchrotron radiation magnetic circular dichroism


3. Antithrombin stabilisation by sulfated carbohydrates correlates with anticoagulant activity


4. Structural photoactivation of a full-length bacterial phytochrome

Important talks

1. Development of Time-Resolved CD at Diamond Light Source (DLS, 2016)


2. Development of 2DIR at Gothenburg University (Lundberg Retreat, 2016)


3. Spectroscopic techniques to probe GAG-Protein Interactions. Their secondary structure, stability and future developments (RSC/Biochemistry society, 2012)

UK Astronomy Technology Centre

Origins of Dust

Fellowship started: October 2017
Fellowship ending: September 2019

My astrophysics research focuses on infrared stellar populations in Local Group galaxies and what they have to say about the chemical evolution of the Universe.

Cool dusty stars and supernovae enrich the interstellar medium with heavy elements and dust grains. These dying stars emit radiation in the infrared. Therefore, using cameras on board the Spitzer Space Telescope, Herschel and the (soon to be launched) James Webb Space Telescope (JWST) the dust producing (and dust destroying) stellar populations of Local Group galaxies can be observed. This allows stars to be characterised on a galactic scale and constraints put on the chemical composition and, abundances of dust as a function of the metallicity (the ratio of heavy elements to helium), following the cosmic evolution of astrophysical dust from the high-redshift universe to the present-day.

To do this, the vast majority of my research involves analysing infrared spectroscopy, photometry and generating radiative transfer models.

Important publications

1. ORCID: 0000-0003-4870-5547


2. The star-forming complex LMC-N79 as a future rival to 30 Doradus. Ochsendorf, B. B., Zinnecker, H., Nayak, O., Bally, J., Meixner, M., Jones, O. C., Indebetouw, R, Rahman, M, 2017, Nature Ast., 1, 268


3. The SAGE-Spec Spitzer Legacy program: the life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification - III. Jones, O. C., Woods, Paul M., Kemper, F., et al., 2017, MNRAS, 470, 3250


4. Probing the Dusty Stellar Populations of the Local Volume Galaxies With JWST/MIRI. Jones, O. C., Meixner, M., Justtanont, K., Glasse, A., 2017, ApJ, 841, 15


5. The mid-infrared evolution of the FU Orionis disk. Green, J. D., Jones, O. C., Keller, L. D., et al., 2016, ApJ, 832, 4


6. The Dustiest Post-Main Sequence Stars in the Magellanic Clouds. Jones, O. C., Meixner, M., Sargent, B. A., Boyer, M. L., Sewilo, M., Hony, S. & Roman-Duval, J., 2015, ApJ, 811, 145

Important talks

1. What have we learnt / do not know about infrared populations? – Invited talk, MEGA-SAGEVIII, Keel


2. SN 1987A: The Formation and Evolution of Dust in a Supernova Explosion – Invited talk, JWST Proposal Planning Workshop, STScI


3. Near-IR stellar populations of Sextans A - The AGB-Supernovae Mass Transition, Rome


4. The Stellar Populations of Local Volume Galaxies with JWST/MIRI - JWST Nearby Galaxies Workshop, California


5. The life-cycle of dust in galaxies: Dust Production from Evolved Stars – Colloquium, Onsala Space Observatory, Sweden

ASTEC, Daresbury Laboratory (STFC)

Particle beam manipulation with high-field THz pulses

Fellowship started: June 2017
Fellowship ending: May 2019

My project will deliver a new generation of high-energy particle accelerators which will meet scientific challenges of this century. The conventional RF-driven accelerator technology is limited to acceleration gradients of less than 100MV/m. Moreover, multi-km scale facilities requires for such high-energy particle physics experiments. It also requires complex equipment and control measures to enable femtosecond resolution in temporal measurement and control of particle bunches. Terahertz radiations have the potential to overcome these challenges and can deliver acceleration gradients several orders of magnitude higher than at radio frequencies. Furthermore, terahertz accelerators have the possibility to be inherently synchronised to femtosecond precision, with multiple critical systems driven by a single-pulsed laser system. I am developing an optical setup which can deliver a high brightness tunable THz radiation source by exploiting the nonlinear optical processes. This THz radiation will accelerate the electron bunches inside the waveguide structures. Using high power Ti:Sapphire oscillator-amplifier laser system, optimisation of an appropriate high field-strength terahertz source and optical engineering design will be carried out to enable the necessary terahertz/particle interaction. This system will be experimentally validated on a working particle-accelerator, demonstrating the viability of the terahertz as a means to manipulate and control high-energy particle beams.

Important publications

1. N. Mitra, A. K. Patra, S. P. Singh, S. Mondal, P. K. Datta, S.K. Varshney, “Interfacial delamination in glass-fiber/polymer-foam-core sandwich composites using singlemode–multimode–singlemode optical fiber sensors: Identification based on experimental investigation,” Journal of Sandwich Structures & Materials (2017): 1099636217733983.


2. S. Mondal, S. Mukherjee, S. P. Singh, S. C. Rand and P. K. Datta, ”Stability Analysis of Cascaded Second-Order Mode-locked Laser Considering Dynamic Gain Aperturing for Picosecond Pulse Generation,” Optics Express 24, 14, 15274–88 (2016).


3. S. Mondal, S. P. Singh, S. Mukherjee, S. Mukhopadhyay, and P. K. Datta, ”Widely tunable intracavity phase-matched cascaded second-order interaction for generation of multi-colour radiation,” IEEE Journal Quantum Electronics 51, 1–5 (2015).


4. S. Mukhopadhyay, S. Mondal, S. P. Singh, A. Date, K. Hussain, and P. K. Datta, ”Dual colour cw mode-locking through soft aperture based on second order cascaded nonlinearity,” Opt. Exp. 21, 454–462 (2013).


5. S. Bhattacharya, R. Maiti, A. Das, S. Saha, S. Mondal, S. Ray, S. Bhaktha B.N., and P. Datta, "Efficient control of ultrafast optical nonlinearity of reduced graphene oxide by infrared reduction," J. Appl. Phys. 120, 013101 (2016).

Important talks

1. “Coherent sources for mid-infrared laser spectroscopy” - 20th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics (2016).


2. "Realization of Inverse Saturable Absorption by Cascaded Second-Order Process for Stable Modelocking” - Frontiers in Optics and Laser Science Conference (FIO/LS-2015).


3. "Intracavity cascaded second order interaction in BBO for generation of efficient, widely tunable coherent radiation” - Advanced Solid State Lasers conference (ASSL-2014).


4. “Multi-colour OPO based on second order cascaded nonlinear interaction” - Lasers and Electro-Optics Pacific Rim Conference (CLEO-PR-2013).


5. "Dual colour CW mode-locking through soft-aperture and second order cascaded nonlinearity” - International Conference on Fibre Optics and Photonics, (2012).

UK Astronomy Technology Centre

Properties of massive stars: single and binaries

Fellowship started: September 2016
Fellowship ending: September 2018

My research interests are focused on the study of the formation and evolution of massive stars (> 8 solar masses). Massive stars end their lives as core collapse supernovae. They are powerful cosmic engines that impact their surroundings affecting the evolution of the galaxies in which they reside. In recent years it has become evident that the majority of the most massive stars do not exist in isolation but form and evolve in binary systems. Massive binary systems can also be the progenitors of black hole binary systems and hence be potential gravitational wave sources such as GW150914, first gravitational wave source detected by LIGO.

The aim of my fellowship is to investigate properties of massive OB objects, single and binaries, located in different starburst regions in the Local Group. By analysing multi-epoch optical spectroscopy, obtained with different instruments of the Very Large Telescope, I determine stellar properties such as temperatures, luminosities, mass-loss rates, etc., for the single stars and orbital periods, mass-ratios, eccentricities, etc., for the binary systems. My work not only aims to constrain their stellar properties but also bridge the gap between observations and theoretical predictions. Finally, at UKATC I am also contributing to the Phase-A study of the potential second generation Multi-Object Spectrograph “MOSAIC” of the Extremely Large Telescope.

Important publications

1. The VLT-FLAMES Tarantula Survey. XXIV. Stellar properties of the O-type giants and supergiants in 30 Doradus; Ramírez-Agudelo et al. 2017, Astronomy & Astrophysics 600, A81


2. The VLT-FLAMES Tarantula Survey. XXV. Surface Nitrogen abundance of the O-type giants and supergiants; Grin, Ramírez-Agudelo et al. 2017, Astronomy & Astrophysics 600, A82


3. Massive pre-main sequence stars in M17; Ramírez-Tannus (+Ramírez-Agudelo) et al. 2017, Astronomy & Astrophysics 604, A78


4. The VLT-FLAMES Tarantula Survey. XXI. Stellar spin rates of O-type spectroscopic binaries; Ramírez-Agudelo et al. 2015, Astronomy & Astrophysics 580, A92


5. The VLT-FLAMES Tarantula Survey. XII. Rotational velocities for the single O-type stars; Ramírez-Agudelo et al. 2013, Astronomy & Astrophysics 560, A29

Important talks

1. Spectroscopic Surveys with the ELT: A gigantic Step into the Deep Universe, October 17-19, 2017, Toledo, Spain
   Talk: Pushing back the horizon: increasing the observations limit of massive stars


2. Stars, Supernovae and Nucleosynthesis, September 4-5, 2017, Edinburgh, United Kingdom
   Talk: Stellar properties of O-type giants and supergiants in 30 Dor


3. Instituto de Astronomia, Geofisica e Ciencias Atmosféricas (IAG), September 17-19, 2016, São Paulo, Brasil
   Colloquium talk: Rotation in massive stars in the Tarantula Nebula


4. Magnetism and variability in O stars, September 17-19, 2014, Amsterdam, The Netherlands
   Talk: Observed rotational properties of the O-type stars in the Tarantula Nebula: single and binaries


5. International Astronomical Union Symposium #307: New Windows on Massive Stars, Asteroseismology Interferometry and Spectropolarimetry, June 23-27, 2014, Geneva, Switzerland
   Talk: Observed rotational properties of the O-type stars in the Tarantula Nebula: single and binaries

ISIS Neutron and Muon Facility

Neutron scattering and μSR studies on transition metal based oxides: An experimental approach to address magnetic structure and interactions

Fellowship started: May 2017
Fellowship ending: May 2019

Transition metal oxides (TMOs) that straddle the subtle boundary between covalent, ionic and metallic bonding show copious physical phenomena, such as high-Tc superconductivity in layered cuprates, colossal magnetoresistance (CMR) in perovskite manganites, half-metallicity, low dimensional (D) magnetism, coexistence of magnetism and ferroelectricity — termed multiferroicity, spin-liquid ground state and many more. This diversity has been stimulated interest for decades while particular focus resides on 3d oxides, where strong electron correlations dominate due to narrow bandwidth with a dramatic manifestation being the occurrence of the Mott metal-insulator transition and 5d oxides, unconventional phenomena are induced by the competing spin-orbit coupling and electron correlation. However, most of the modern transition metal based systems under study remain to be formally analysed in terms of magnetic point group symmetries, which are vital for the analysis and prediction of the magnetic structures, magnetic excitations, spin fluctuations as well as magnetoelectric effects and for this the microscopic techniques, like- inelastic neutron scattering, neutron diffraction and μSR are obvious. Hence, the aim of my research is to study suitable 3d and 5d TMOs using these techniques, which will allow a stringent test of the various theoretical models based on low-D magnetism, multiferroicity, and frustrated magnetism.

Important publications

1. J. Sannigrahi, S. Giri, and S. Majumdar: Observation of weak ferromagnetism and the sizable magnetocaloric effect in Co2V2O7. Journal of Physics and Chemistry of Solids. 101 1-4 (2016).


2. J. Sannigrahi, S. Giri, and S. Majumdar: Magnetic and electric properties of Mn2V2O7, Solid State Comm. 228 10 (2016).


3. J. Sannigrahi, S. Bhowal, S. Giri, S. Majumdar, and I. Dasgupta: Exchange striction induced giant ferroelectric polarization in copper based multiferroic material α-Cu2V2O7, Phys. Rev. B. 91 220407(R) (2015).


4. J. Sannigrahi, S. Chattopadhyay, A. Bhattacharyya, S. Giri, S. Majumdar, D. Venkateshwarlu, and V. Ganesan: Two dimensional magnetic correlation in the unconventional corrugated layered oxides (Ba,Sr)4Mn3O10, J. Phys.: Condens. Matter. 27 056001 (2015).


5. J. Sannigrahi, S. Chattopadhyay, D. Dutta, S. Giri, and S. Majumdar: Magnetic and electric properties of CaMn7O12based multiferroic compounds: effect of electron doping, J. Phys.: Condens. Matter. 25 246001 (2013).

Important talks

1. “Structural diversity and novel magnetic and electric properties of M2V2O7.” J. Sannigrahi and S. Majumdar, 7th IACS-APCTP-Academy Joint Conference on Emergent Phenomena in Novel Oxide Materials and Low Dimensional Systems sponsored by Indian Academy of Sciences, Bengaluru, Indian Association for the 6 Cultivation of Science, Kolkata and Asia Pacific Center for Theoretical Physics (APCTP), Korea, 29th November to 2nd December, 2015 in Orange County, Coorg, India.

Particle Physics Department

Development of Silicon Strip Sensor test platform for the upgrade of the ATLAS experiment at CERN

Fellowship started: August 2017
Fellowship ending: August 2019

The project is to work within the particle physics department at STFC-RAL to develop a software test platform that will allow PPD to run repeatable production tests of silicon detector modules, used in the upgrade of the ATLAS inner detector at CERN. The modules have demanding electrical and mechanical requirements in terms of signal efficiency and noise performance, as well as High and Low Voltage powering and cooling. Testing these modules in various ways (given through a variable software platform) optimises both the production flow and the product itself for later operation. Delivering a framework that allows PPD to run repeatable tests on objects in a simplistic and fast manner, whilst delivering accurate and repeatable results will allow me to apply my software skills in support of the future production of the tracker as well as enhancing the hardware of the future tracker by early stage understanding of characteristics. Developing an understanding of the achievable performance, I will also test CMOS active sensor candidates to compare their performance to the baseline module build envisaged for the ATLAS inner detector upgrade.

Important publications

1. “Precision measurement of the e + e − → Λ +c Λ -c cross section near threshold”, [BESIII Collaboration], Phys. Rev. Lett. 120, 132001 (2018)


2. “Search for heavy resonances decaying into W W in the eνμν final state in pp collisions at √s = 13 TeV with the ATLAS detector”, [ATLAS Collaboration], Eur. Phys. J. C 78, no. 1, 24 (2018)


3. “Precision measurement of D ∗0 branching fractions at BESIII”, [BESIII Collaboration], Phys. Rev. D 91, 031101(R) (2015)


4. “Precision measurement of the integrated luminosities of the data taken by BESIII at center of mass energies between 3.81 GeV and 4.42 GeV”, [BESIII Collaboration], Chin. Phys. C 39, 093001 (2015)


5. “Observation of a Charged Charmoniumlike Structure in e + e − →π + π − J/ψ at √s =4.26 GeV”, [BESIII Collaboration], Phys. Rev. Lett. 110, 52001 (2013)

Important talks

1. “Data driven W+Jets background estimation using the fake factor method in the WW -> lvlv final state at ATLAS” , International Symposium on Higgs Boson and Beyond Standard Model Physics, China, (2016)


2. “The study of Λ c decays at BESIII”, 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Kyoto, Japan, (2016)


3. “The study of e + e − → Λ +c Λ –c at BESIII”, International Workshop on QCD Exotics, Jinan, China, (2015)


4. “The recent results from BESIII”, Heavy Flavour and CP Violation 2014, China (2014)


5. “The recent results about Charmonium(like) states at BESIII”, XIth Quark Confinement and Hadron Spectrum, St. Petersburg (2014)