Jyoti Prasad Biswas

High average current HVDC electron gun for EIC hadron cooling

Erdong Wang, Omer Rahman, J. Skaritka, R. Lambiase et autres

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Single layer graphene protective layer on GaAs photocathodes for spin-polarized electron source

Jyoti Prasad Biswas, Mengjia Gaowei, Kali Prasanna Mondal, Erdong Wang et autres

GaAs-based photocathodes are the primary choice for polarized electron sources, commonly used in polarized electron microscopes and polarized positron sources. GaAs photocathodes are typically activated with cesium and oxygen, which are highly reactive and require an ultra-high vacuum (∼10−11 Torr or lower) …

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Polarized Photocathodes development for the EIC: Optimizing Spin and Quantum Efficiency

Jyoti Prasad Biswas

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Polarized Photocathode R&D at BNL and spin consideration for the EIC

Jyoti Prasad Biswas, Erdong Wang, Omer Rahman, J. Skaritka et autres

Superlattice GaAs photocathodes are vital for producing polarized electron beams for the Electron-Ion Collider (EIC) at Brookhaven National Laboratory. The electron pre-injector at the EIC requires a 7 nC bunch with at least 85% spin polarization from a GaAs-based superlattice cathode. The …

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Femto-second laser ablated surface-textures in AISI 440C martensitic stainless steel for precision bearings: Hardness, residual stress, lubricant wettability, friction and wear assessment

Pooja Anand, Jyoti Prasad Biswas, Sanasam Sunderlal Singh, G.L. Samuel et autres

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Palladium-Catalyzed Para-Selective Arylation of 1-Naphthamide

Sukumar Pradhan, Uttam Dutta, Jyoti Prasad Biswas, Mazen Elsaid et autres

-naphthoic acids is highly challenging due to the presence of proximally more accessible C-H bonds at the C2 and C8 positions. Herein, we report the first palladium-catalyzed direct C4 arylation of 1-naphthamides with high regioselectivity and excellent functional group compatibility. Diverse aryl …

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Rhodium‐Catalyzed Meta ‐C−H Arylation of Arenes with Varied Linker Lengths: Bridging Catalytic Selectivity with Structural Diversity

Astam Mandal, Jyoti Prasad Biswas, Debabrata Maiti

The directing group (DG)-assisted approach has so far been the major route to achieve selective C-H activation at both proximal and distal positions. While rhodium catalysts are highly effective in DG-assisted ortho-C-H arylation, meta-C-H arylation with rhodium has not yet been reported. …

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Rhodium‐Catalyzed Meta‐C−H Arylation of Arenes with Varied Linker Lengths: Bridging Catalytic Selectivity with Structural Diversity

Astam Mandal, Jyoti Prasad Biswas, Debabrata Maiti

Abstract The directing group (DG)‐assisted approach has so far been the major route to achieve selective C−H activation at both proximal and distal positions. While rhodium catalysts are highly effective in DG‐assisted ortho‐C−H arylation, meta‐C−H arylation with rhodium has not yet been …

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Advancements in Accelerator Physics and System Developments for the EIC

Alexei Blednykh, Panagiotis Baxevanis, William Bergan, Jyoti Prasad Biswas et autres

The development and enhancement of the Electron-Ion Collider (EIC) are founded on extensive research and development efforts aimed at achieving rigorous performance goals. This document outlines the crucial research and development (R&D) efforts that underpin the various systems and components of the …

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High-intensity polarized electron gun featuring distributed Bragg reflector GaAs photocathode

Erdong Wang, Omer Rahman, Jyoti Prasad Biswas, J. Skaritka et autres

The polarized electron source is a critical component in accelerator facilities such as the electron–ion collider, which requires a polarized electron gun with higher voltage and higher bunch charge than existing sources. One challenge we faced was the surface charge limit of …

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An upgrade for the CeC cathode deposition system: co-deposition of K₂CsSb and CsTe/GaAs for CeC use

Kali Prasanna Mondal, R. Begay, Jyoti Prasad Biswas, L. Cultrera et autres

Properties such as high quantum efficiency (QE), low thermal emittance, and longevity are crucial features for the rapidly developing electron accelorators. Compared to the traditional sequential deposition, the co-evaporation method is reported to yield better surface roughness, film crystallinity, and high quantum …

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Effect of pulse repetition rate on synthesis of TiOx nanoparticles by femtosecond pulsed laser ablation in aqueous medium

Jyoti Prasad Biswas, Sanasam Sunderlal Singh, G.L. Samuel

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