Quality Assurance Electrical

Prabir Roy

Phone: 510-***-**** ******@*****.*** U.S. citizenship

http://www.linkedin.com/pub/prabir-roy/4a/41a/369/

Qualification Summary

Extensive research and development experience in experimental physics related to keV to MeV energy range

linear accelerators. Designed and developed charged particle sources, beam transport systems, electron and

ion diagnostics (including imaging system, fast response and short pulsed optical, electrical, impulses),

high-dense plasma sources, pulsed tube, and various types of beam quality test equipments. Additional

experience on injector development and beam transport modeling, experimental statistical data collection

(using Labview), data analysis (using computer software MS excel, python, Math-Cad), including compar-

ing experimental data to theoretical models. Published more than 15 peer reviewed principal author articles

on the field. Ability to work on a team or independently.

Professional Experience

Lawrence Berkeley National Laboratory, Berkeley, California, USA, Sr. Scientific

Associate (2013-2006), Physicist Scientist (2006-2004), Postdoc Physicist (2003-2002)

Accomplishments:

• Formulated designs (including proto-type), development, and characterization of lithium alumino-

silicate ion sources. Performed investigation on the lifetime, neutral atom loss at duty factors, temper-

atures and energies [Roy et al., Review of Sci. Instrum., 82 (2011) 013304].

– Provided source design parameters of a 11M US$ ARRA funded induction accelerator project at

LBNL, with potentiality to use the source as a tool for development of plasma diagnostics.

• Conducted an experiment and demonstrated result on intense beam compression in plasma; 400 times

radial compression and 50 times longitudinal compression enhanced a beam density significantly–a

world class physics result [Roy et al., Phy. Rev. Letters, 95 (2005) 234801].

– A key advancement of physics experiments to increase ion beam particle number density; celebrated

by scientific communities, and cited internationally more than 100 times.

• Conduced experiments and validated first beam dynamics experimental result of a Pulse Line Ion

Accelerator (PLIA) [Roy et al., Phy. Rev. STABeams, 9 (2006) 070402].

– A cost effective low energy particle accelerator technique is useful for industries.

• Designed, developed and demonstrated a novel method of non perturbing ion-beam diagnostic using

a non-intense electron beam [Roy et al., Rev. of Sci. Instrum., 76 (2005) 023301].

– A scientific and technological achievement, conceived by some other laboratories in the USA, UK,

China, Germany for non-perturbing beam measurements.

• Designed, developed and demonstrated a prototype plasma probe and applied to a 8 T magnetic field

line to characterize high dense plasma distribution [Roy et al., Nucl. Instrum. Meth. Phys. Res. A606

(2009) 22].

– A characterization of magnetic mirror affect on particles, demonstration of intense plasma channel

formation, a technique to focus a beam without spreading, and has potentiality to use for rapid cooling

of hot materials in space where radiation alone is not enough.

• Achieved expert level experience on electrical quality assurance (QA) with Hi-pot, sequential resis-

tance, electrical impulses, stress and strain measurements.

– An important quality to qualify and test magnets at tens of kilo-Amper level current for characteri-

zation of prototype magnets.

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Center for Applied Physics studies, Louisiana Tech Univ., Ruston, USA, postdoc

Physicist (2001-2002)

Accomplishments:

Tested, debugged and installation Inter-Cryostat-Detector (ICD) electronic drawers assembly with cos-

mic ray test (using photo multiplier tubes and its associated electronics) for Fermi-National Laboratory

D-zero Run II project. Also, contributed to build up charge exits detectors (CEDs) foam box structure

to hold CED plates for a scattering experiment for the Jefferson laboratory G-zero projects.

–A major accomplishment of an institutional responsibility on schedule for international collaboration.

Name was included in several PRL papers.

Omachron Science Inc., Hampton, Ontario, Canada, Research Scientist (1998-2001)

Accomplishments:

• Conceived, conducted and developed new experiments related to plasma, material atomization, ther-

modynamics technologies. Introduced plasma and a quicker heat transfer in an artificial space envi-

ronment was demonstrated.

–The system proved that electrons in the plasma could be used in a vacuum to enhance or reduce heat

transfer between two objects (a US Patent by a Canadian company).

• Identified a new process making liquid metal droplets or metal powder of micron size by designing an

electrostatic atomization technique.

–Results used for a US patent by a Canadian and US companies.

• Utilized an electrical discharge in a desk-sized plasma reactor with combustion NOx exhaust being

dissociated.

– Results used for a US patent by a Canadian and US companies.

• Study performed on vapor deposition/plasma spray for sub-micron precise geometry.

• Participated in designing, developed, and demonstrating a new Heat Engine prototype which was

contributed to a US Patent by a Canadian company.

Previous Relevant Experience

Institute of Laser Engineering (ILE), Osaka Univ., Osaka, Japan, Research Fellow

Accomplishments:

• A laser heated electron injector was demonstrated [P. K. Roy et al., Rev. Sci. Instrum., 67 (12)(1996)4098].

–The direct laser heating was so efficient that this laser heating technique eliminated the magnetic

fields at the cathode surface. Such fields, even when very small, lead to emittance dilution and are all

but unavoidable when ohmic or beam heating is used.

• A multistage electron collector was designed using the EGUN code and developed for an electron

beam energy recovery system [P. K. Roy et al., Rev. Sci. Instrum., 68 (12)(1997) 4404].

–The collector reduced and controlled the escaping of the primary trajectories and secondary electrons.

• A higher efficient electron beam energy recovery system was successfully demonstrated [P. K. Roy et

al., Japanese J. of Applied Phys., 38I (1999) 279].

–Accomplishment of a scientific validation experiment for industrial and scientific applications.

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Education

University level:

• Ph. D., Electromagnetic Energy Engineering, ILE, Osaka University, Japan. Thesis title: Experimental

Study on an Electron Beam Energy Recovery System for Free Electron Lasers, (1998).

• Master of Science (M. Sc.), Physics, Chittagong University, Bangladesh. Thesis title: Measurement of

gamma radioactivity in soil using HPGe detector, (1987), at RTL, BGD Atomic Energy Commission.

(installed the detector, shielding assembly, multichannel analyzer, sample preparation for γ radiation)

• Bachelor of Science (B.Sc.) (Hons.), Physics, Chittagong University, Bangladesh, (1986).

Training

Continuing Education:

• Beam Physics with Intense Space Charge, US Particle Accelerator School (4 graduate course credits

of Boston University, Massachusetts, USA) June 12-23 (2006).

• ‘Technical writing’, Univ. of California Berkeley extension, UC Berkeley, USA (2004).

Association Membership

• APS (1995–current) MD, USA, • IEEE (1999–current) NY, USA, • AAAS (2008–current) DC, USA.

Languages

• English (Orally and written: fluent), • Japanese (Orally: fluent, written: proficient),

• Bengali (Orally and written: fluent).

Addendum 1: Awards and honors

• Presented invited talks: International Heavy Ion Fusion (HIF) Symposium in 2004 (Princeton Univ.),

2006 (France), 2008 (Japan), 2010 (Germany), and 2012 (Berkeley, USA); LINAC 2006 (Tennessee).

• Oral contribution talks: APS-DPP, 2005 to 2011, every year.

• Poster presentation: PAC 2005 to 2011, every year.

• Spot Recognition Award of Berkeley Lab in 2012 (for source development), and 2013 (for safety).

• Award of Excellence by US Defense programs for contribution to the Stockpile Stewardship (2006).

• MONBUSHO (Ministry of Education, Japan Government), Japan (Oct.1994-March 1998).

• National Science and Technology Fellow, Bangladesh Government (Dec. 1991 -Aug. 1992).

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Addendum 2: Partial list of publications (P. K. Roy):

Review articles

1. P. K. Roy et al., Lithium ion sources, Nucl.Instrum. Methods Phys. Res. in press, June, 2013,

http://dx.doi.org/10.1016/j.nima.2013.05.086.

2. P. K. Roy et al., Source fabrication and lifetime for Li + ion beams extracted from alumino-silicate

sources, Rev. Sci. Instrum., 83(4), (2012) 043303-8.

3. P. K. Roy et al., Li+ alumino-silicate ion source development for the Neutralized Drift Compression

Experiment (NDCX), Rev. Sci. Instrum., 82,(2011) 013304-7.

4. P. K. Roy et al., A space-charge-neutralizing plasma for beam drift compression, Nucl.Instrum. Meth-

ods Phys. Res. A606 (2009) 22–30.

5. P. K. Roy et al., Neutralized drift compression experiments with a high-intensity ion beam, Nucl.

Instrum. Methods Phys. Res. A 577 (2007) 223–230.

6. P. K. Roy et al., Energy amplification and beam bunching in a pulse line Ion accelerator, Phys. Rev.

STAccel. Beams, 9 (2006) 070402. (LBNL–59896).

7. P. K. Roy et al., Drift compression of an intense neutralized ion beam, Phys. Rev. Lett. 95, (2005),

pp. 234801, (LBNL–58769).

8. P. K. Roy et al., Neutralized transport experiment, Nucl. Instrum. Methods Phys. Res. A 544 (2005)

225–235, (LBNL–55157).

9. P. K. Roy et al., Electron beam diagnostic for space charge measurement of an ion beam, Rev. Sci.

Instrum.76(2) (2005) 023301–8, (LBNL–56392).

10. P. K. Roy et al., Study of non-intercepting ion beam diagnostic for beam density profile, Nucl. In-

strum. Methods Phys. Res. A 544 (2005) 520–526.

11. P. K. Roy et al., Results on intense beam focusing and neutralization from the neutralized beam

experiment, Phys. Plasmas, 11(5) (2004) 2890–2898,(LBNL–53974).

12. P. K. Roy et al., Experimental study of electron beam energy recovery system with a laser heated

electron gun and a multistage electron collector for high efficient beam application, Japanese Journal

of Applied Physics, 38,part-I(1999) 279–285.

13. P. K. Roy et al., Experimental study on an electron beam energy recovery system using a multistage

electron collector, Rev. Sci. Instrum. 69(4) (1998)1685–1687.

14. P. K. Roy et al., Design study and experimental performance of a multistage electron collector, Rev.

Sci. Instrum. 68(12) (1997) 4404–4408.

15. P. K. Roy et al., Study of a laser-heated electron gun, Rev. Sci. Instrum., 67(12) (199*-****-****.

16. P. A. Seidl et al., Development and testing of a lithium ion source and injector, Phys. Rev. STAccel.

Beams, 15, (2012) 040101-8.

17. A. Anders et al., Hollow Plasma in a Solenoid, IEEE Trans. on Plasma Science 39(11) (2011) 2888-

2889.

18. A. Anders et al., Dense metal plasma in a solenoid for ion beam neutralization, IEEE Trans. on

Plasma Science 39(6) (201*-****-****.

19. P. A. Ni et al., Li+ ion emission from a hot-plate alumina-silicate source stimulated by flash heating

with an infrared laser, Rev. Sci. Instrum., 82,(2011) 023304-9.

20. P. A. Seidl et al., Progress in beam focusing and compression for warm-dense Matter experiments,

Nucl. Instrum. Methods Phys. Res. A606 (2009) 75–82.

21. A. B. Sefkow et al., Simulations and experiments of intense ion beam current density compression in

space and time, Phys. Plasmas 16 (2009) 056701.

22. F. M. Bieniosek et al., High-energy density physics experiments with intense heavy ion beams, Nucl.

Instrum. Methods Phys. Res. A606 (2009) 146–151.

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