General Lab Information

Jyoti Biswas

Research Staff 3 Physics, Accelerator Physics, Electron-Ion Collider

Jyoti Biswas

Brookhaven National Laboratory

Electron-Ion Collider
Bldg. 1005S, Room 2-202
P.O. Box 5000
Upton, NY 11973-5000

(614) 370-4101
 jbiswas@bnl.gov

Jyoti Biswas serves as an Assistant Physicist within the Accelerator Physics Group at the Electron-Ion Collider (EIC). He obtained his Ph.D. in Physics from Stony Brook University, New York, USA, in 2020. Following this, he joined the Instrumentation Division at Brookhaven National Laboratory (BNL) as a postdoctoral researcher, where he focused on the development of high quantum efficiency and long-lifetime photocathodes. In 2022, he transitioned to the EIC Directorate.

Dr. Biswas has made significant contributions to the development of High Voltage DC guns, low voltage high current cathode test stands, graphene coatings on alkali antimonide photocathodes, and DBR and superlattice GaAs-based photocathodes. At the EIC, his work primarily involves research and development of polarized electron sources, as well as the pre-injector with a Wien filter for spin manipulation.

He possesses expertise in beam dynamics simulation packages such as Parmela and General Particle Tracer (GPT), as well as electromagnetic software including Opera 3D and Poisson/Superfish. Additionally, Dr. Biswas is proficient in spin measurement using Mott polarimetry and has extensive experience with various material characterization techniques such as XPS, TEM, STM, LEEM, LEED, Raman spectroscopy, among others.

Expertise | Research | Education | Appointments | Publications

Expertise

  • Polarized electron source, high Voltage DC guns, Beam dynamics simulation
  • GaAs-based photocathodes, Spin Measurement
  • XPS, TEM, STM, LEEM, Raman, XRD 
  • Parmela, GPT, Opera 3D, Poisson/Superfish

Research Activities

  • Electron pre-injector with Wien filter for spin manipulation
  • Robust photocathode material for high QE and long lifetime
  • Superlattice GaAs QE and spin evaluation
  • Beam dynamics for high current low voltage cathode test stand
  • Monte Carlo Vacuum simulation for BNL EIC 350kV DC gun 
  • Ion back bombardment induced Cathode damage in DC gun
  • Photocathodes with improved properties

Education

Ph.D. in Physics, Stony Brook University, NY, USA,  2020 

Professional Appointments

 Assistant Physicist, Electron-Ion Collider,  BNL,  11/2022 – Present 

Postdoctoral Research Associate, Instrumentation division, BNL,  11/2020 - 11/2022

Selected Publications

  • Biswas J, Wang E, Gaowei M, et al (2021) High quantum efficiency GaAs photocathodes activated with Cs, O2, and Te. AIP Advances 11:025321. https://doi.org/10.1063/5.0026839
  • Biswas J, Cen J, Gaowei M, et al (2020) Revisiting heat treatment and surface activation of GaAs photocathodes: In situ studies using scanning tunneling microscopy and photoelectron spectroscopy. Journal of Applied Physics 128:045308. https://doi.org/10.1063/5.0008969
  • Biswas J, Gaowei M, Liu A, et al (2022) Cesium intercalation of graphene: A 2D protective layer on alkali antimonide photocathode. APL Materials 10:111115. https://doi.org/10.1063/5.0122937
  • Wang E, Litvinenko VN, Pinayev I, et al (2021) Long lifetime of bialkali photocathodes operating in high gradient superconducting radio frequency gun. Scientific Reports 11:. https://doi.org/10.1038/s41598-021-83997-1
  • Wang E, Rahman O, Skaritka J, et al (2022) High voltage dc gun for high intensity polarized electron source. Physical Review Accelerators and Beams 25:. https://doi.org/10.1103/physrevaccelbeams.25.033401
  • Biswas J, Rahman O, Wang E (2019) Study of Photocathode Surface Damage due to Ion Back-Bombardment in High Current DC Gun. Proceedings of the North American Particle Accelerator Conference NAPAC2019:USA. https://doi.org/10.18429/JACOW-NAPAC2019-MOPLH02
  • Biswas J, Cultrera L, Liu W, et al (2023) Record quantum efficiency from strain compensated superlattice GaAs/GaAsP photocathode for spin polarized electron source. AIP Advances 13:. https://doi.org/10.1063/5.0159183
  • Biswas,Jyoti, Wang,Erdong, Skaritka,John, et al (1AD) Quest for an optimal spin-polarized electron source for the Electron-Ion Collider. IPAC24: https://doi.org/10.18429/JACoW-IPAC2024-MOPR77
Jyoti Biswas

Brookhaven National Laboratory

Electron-Ion Collider
Bldg. 1005S, Room 2-202
P.O. Box 5000
Upton, NY 11973-5000

(614) 370-4101
 jbiswas@bnl.gov

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