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My Research Interests :
I
joined the Laser Plasma Division,
Center for Advanced Technology (CAT),
Department of Atomic Energy, Govt. of
India, Indore in 1994 as Scientific Officer-C . The work of the division
has been related to the Indian initiative towards
Inertial Confinement Fusion.
Read a general article
on the relevance of FUSION (ICF) published in INDIA TODAY, August 31'
1998 ->
click here.
I worked towards the development of High
Power Nd:Glass Laser chain (100 Joule - 3 nanosecond per beam, four
beams), where I worked on design, development & operation of various
sub-systems. I, along with other colleagues developed Q-switched
Nd:Glass–Nd:YLF Hybrid Laser Oscillator, Pulse Slicer, Spatial Filters,
Laser Amplifiers, Frequency Conversion System and handled day to day
operation & maintenance of laser chain for laser-plasma experiments.
Coordinated the development of Laser Glass and Pockell Cells with
Central Glass & Ceramic Research Institute, Calcutta and Laser Materials
Division, CAT . I had been associated with the
High Power Laser Laboratory of
Laser Plasma Division till May 1999
(refer to list of publications).
To devote more time to my new found
interest in Plasma, I switched to the analytical modeling &
simulation of laser
produced plasmas and shifted to the
Laser Plasma Laboratory
of the same
division. Where, I focused on the study of "Relativistic Effects in
Short Pulse Laser Plasma Interaction". I was awarded a Ph.D. by Indian Institute
of Technology,
Delhi on the same topic. I have setup a 3D-PIC (particle-in-cell) code
"PICPSI-3D" for studying laser interaction with a preformed plasma,
where I am studying laser based particle acceleration and related
phenomena. Recently, I developed a 30 node computing cluster to develop
parallel version of this code. I am also using 2D - hydrodynamic code "MULTI-2D" for
hydrodynamic simulation of laser material interaction. At present I am continuing as Scientific
Officer - E.
Academic Achievements :
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2003 : Ph.D. (Plasma Physics :
Laser-Plasma Interaction),
Indian Institute of Technology (IIT), New Delhi, India. (CGPA :
9.5/10 in Pre-Ph.D. courses). |
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1994 : M.Sc. Physics (Specialization:
Fiber & Integrated Optics),
Indian Institute of Technology (IIT), New Delhi, India. (CGPA :
9/10). |
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1991 : B.Sc.
(Electronics), University of Gorakhpur, Gorakhpur, U.P., India
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Projects
/ Certificates :
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M.Sc. Project : “Design and
Fabrication of Suspended Microstrip Filters Using Dielectric
Resonators at X-band” with
Prof. Bharthi Bhat &
Prof.
S.K. Koul at Center for Applied Research in Electronics (CARE),
Indian Institute of Technology (IIT), Delhi. |
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Three month short term course on
“Digital Electronics & Analog Linear Circuits (with practicals on
Microprocessor System Testing/Repairs and Product Design)” from
Jan-March 1992 at Center for Electronics Design and Technology of
India (CEDTI), M. M. M. Engineering College Campus, Gorakhpur, UP.
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Computer Skills*
:
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OS : Windows (all versions), Linux
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Languages : Visual C++, Fortran,
Java (I have done a one & half year extensive course on advanced java
programming from Pentasoft Ltd., Indore) |
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Databases : Oracle 7.3 (I have done
an advanced level extensive course on RDBMS, SQL/PL-SQL, Oracle DBA
and front-end Developer 2000 from CMC, Indore) |
* I have
supervised one MCA and two M.Sc. (Comp. Sc.) projects.
Awards / Offices /
Memberships :
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Joint Secretary, Physics Society,
I.I.T., Delhi. |
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J.R.Chopra Award for the best
project in Pure & Applied Sciences (M.Sc.). |
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Member, Plasma Science Society of
India. |
References :
Dr. P. D. Gupta,
Director,
Raja Ramanna
Center for Advanced Technology,
Indore – 452 013, India.
Ph: +91-731-2488846,
Email : pdgupta@rrcat.gov.in |
Prof. V. K. Tripathi,
Dept. of Physics,
Indian Institute of Technology,
Hauz Khas, New Delhi – 110 016, India.
Ph: +91-11-26591351
Email : vkt@physics.iitd.ernet.in |
Dr. P. A. Naik
Head, Laser Plasma Division
Raja Ramanna
Center for Advanced Technology,
Indore – 452 013, India.
Ph: +91-731-2442502,
Email : panaik@rrcat.gov.in |
Prof. R. P. Sharma,
Center for Energy Studies,
Indian Institute of Technology,
Hauz Khas, New Delhi – 110 016, India.
Ph: +91-11-26591257
Email : rpsharma@ces.iitd.ernet.in |
Current Research :
Laser fusion research has led to the
progress of intense lasers and the physics of laser produced plasmas.
The invention of chirped pulse amplification (CPA) technique has made it
possible to realize the laser intensity > 1020W/cm2.
Such ultra high power lasers with ultra short pulse can be produced not
only in a big laser system, but also in a tabletop laser system called
table-top-terawatt (T3) laser. This laser can be made to pass
through a low-density plasma channel to ignite a compressed core. This
scheme is called fast ignition and is being studied experimentally. Many
scientists have shown interest in the physics and applications of matter
irradiated by such ultra high intensity lasers. Experiments and
particle-in-cell simulations have reported the generation of strong
magnetic fields in the 100MG range. This magnetic field is an almost
stationary field generated by the strong current of hot electrons. In
addition, the ponderomotive pressure is about 10 Gbar at IL
=1019W/cm2 and much higher than the plasma
pressure. As a result, charged particle motions become complicated under
the influence of strong magnetic fields, ponderomotive force and
relativistic effects. The propagation of such ultra-short high-intensity
laser pulse in under-dense plasma is of interest, both for the
understanding of laser interactions in this new relativistically driven
plasma regime and for applications such as laser wake field
accelerators, X-ray lasers. Computer simulations have been taken up to
study the interaction of ultra-short high-intensity laser pulse with
under-dense plasma and over-dense plasma and to study the X-ray
emission. Magnetic instability, fast ion acceleration and interaction
with cluster are some other important phenomena of interest.
I took up experimental work on laser
plasma interaction in 2001, where I participated in various experiments
on laser plasma interaction using a 2 J-200 psec. laser system. Using
this system we have studied the equation of state of some metals under
high pressure. I have also been involved in
experimental work on interaction of atomic clusters with an intense
short pulse laser, where we studied the absorption and scattering of
longer laser pulse (~25 psec, 2 J) with gas clusters and emission of
x-rays and its correlation with cluster size.
My current research interest is the theory & simulation
of laser plasma interaction in ultra-high intensity short pulse domain.
I have
developed analytical model using paraxial wave equation to study the
propagation of a high intensity short pulse laser in underdense plasma
and have studied the evolution of pulse, stimulated Compton scattering
and non-resonant second harmonic generation. I have also studied the
effect of a relativistic electron beam in underdense plasma where I have
developed an analytical model using kinetic theory.
My thesis work on the theory of laser plasma interactions
gave me in-depth understanding of various plasma processes. This helped
me in enhancing my skills towards interpretation of experimental results
and, I could take up simulation of laser plasma interaction. I have
setup a 3D particle-in-cell code PICPSI-3D developed at L&PTD, BARC,
Mumbai, India. The code has been modified to suit our need and
has been commissioned in our simulation laboratory to study the laser-plasma
based acceleration schemes. Recently, we have commissioned a 30 node
computing cluster, on which we are developing a parallel PIC code for
laser-plasma interaction studies. The code is being run to study the two
important domains of laser wake field acceleration i.e. SM-LWFA regime
(keeping in view of existing laser power in our laboratory) and Bubble
regime (keeping in view of augmentation in our laser power). I have also
setup the 1D-PIC code LPIC++ developed at Max-Planck Institute, Germany.
Publications
Journals: 7
Reports:
1
Conferences: 14
Journals:
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Second Harmonic Generation in a
Plasma Channel, A. Upadhyay and V. K. Tripathi, J.
Plasma Physics, vol. 71, part 3, pp. 359–366, 2005
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Equation of State Studies using a
10Hz Nd:YAG Laser Oscillator, M. Shukla, A. Upadhyay,
V.K.Senecha, P. Khare, S. Bandopadhyay, V. N. Rai, C.P. Navathe, H.
C. Pant, M. Khan & B. K. Godwal; Laser and Particle Beams, vol. 21,
611, 2003.
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Weibel Instability of Relativistic
Electron Flows in a Plasma and its Coupling to Plasma Waves,
A. Upadhyay, V. K. Tripathi and H. C. Pant, Plasma Phys. &
Cont. Fusion, vol. 44, 2357-63, 2002.
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Effect of Hot Electrons on Stimulated
Compton scattering of a Laser in a Self Sustained Plasma Channel,
A .Upadhyay, V. K. Tripathi and H. C. Pant, Physics of
Plasmas, Vol. 9, No.5, May 2002.
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Asymmetric Self-Focussing of a Laser
Pulse in Plasma, A .Upadhyay, V.K. Tripathi, A. K.
Sharma and H.C.Pant, J. of Plasmas Phys., vol. 68, part I, 75-80,
2002.
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Pulse Front Sharpening of a Laser in
Plasma., A. Upadhyay , V.K.Tripathi, H.C. Pant,
Physics Scripta, Vol.63, 326-328, 2001.
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Development of High Power Laser and
Relevant Technology in India, A.S.Joshi, .P.Navathe, M.S.Ansari,
M.P.Kamath, S.Bandyopadhyay, A. Upadhyay, A.P.Kulkarni,
P.K.Tripathi, P.Khare, S.R.Patwa, J.D. Singh, N.Sreedhar, R.Chandra,
M.N.Kumbhare and H. C. Pant, Fusion Engineering and Design, Vol. 44,
67-70, 1999.
Report:
1.
1-D Particle in Cell (PIC) Simulation of
Relativistic Laser Plasma Interaction Using LPIC++, A. Upadhyay,
RRCAT Internal Report # CAT/2006-02, 2006.
International /
National Conferences:
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Scattering of Multi-Picosecond Laser
Light from Argon Gas Cluster Plasma, H. Singhal, V. Arora, P. A.
Naik, R. A. Khan, A. Upadhyay, S.R. Kumbhare and P.D.
Gupta, Proc. Of Fourth DAE-BRNS National Laser Symposium, Jan.
10-13, 2005, Bhabha Atomic Research Center, Mumbai, India.
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Design and Performance of High Power
Laser for High Pressure Physics Experiments, H. C. Pant, M. Shukla,
A. Upadhyay, V. N. Rai, V. K. Senecha, M. Khan and B.
K. Godwal, International Conference on Frontiers of Plasma Physics
and Technology, Dec. 9-14’ 2002, Banglore, India.
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High Speed Time & Space Resolved
Diagnostics of Laser Produced Plasma, M. Shukla, H. C. Pant, V. K.
Senecha, A. Upadhyay, V. N. Rai and B. K. Godwal,
International Conference on Frontiers of Plasma Physics and
Technology, Dec. 9-14’ 2002, Banglore, India.
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"Role of Decay Instability in Second
Harmonic Emission from Laser Produced Plasmas" by A. Upadhayay,
A. Kumar and V.K. Tripathi; 17th National Symposium on Plasma
Science and Technology, Dec. 16-19, 2002 at Bharathiar Univ.,
Coimbatore.
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Asymmetric Self-Distortion of a Short
Laser Pulse in a Plasma, A. Upadhyay, V.K.Tripathi and
H.C.Pant, XVI Plasma Science Society of India Symposium on Plasma
Science and Technology, Nov. 2001, Center for Plasma Physics,
Guwahati, India.
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Pulse Front Sharpening of a laser in
Plasma, A. Upadhyay, V.K.Tripathi, H.C. Pant, XV
Plasma Science Society of India Symposium on Plasma Science and
Technology, Dec. 2000, Saha Institute of Nuclear Physics,
Calcutta, India.
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Development of High Power Glass Laser
for Plasma Studies, A. S. Joshi, M. P. Kamath, A. Upadhyay,
P. K. Triapthi, A. P. Kulkarni, R. Pareekh and S. Gupta, National
Seminar on High Power Lasers and their Applications, Feb. 1999,
Cochin University, Cochin, India.
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Development of Nd:Glass (Phosphate)
for High Power Laser, A. Upadhyay, P. K. Tripathi, M.
P. Kamath and A.S. Joshi, National Seminar on High Power Lasers and
their Applications, Feb. 1999, Cochin University, Cochin.
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Testing of Sol-Gel coated
Anti-Reflection Coatings, R. Pareekh, A. P. Kulkarni, S. Gupta and
A. Upadhyay, Proc. of National Laser Symposium 1998,
Indian Institute of Technology, Kanpur, India.
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On-Line Collimation of Relay Systems
for the High Power Nd:Glass Laser, M.P. Kamath, A. Upadhyay,
A. P. Kulkarni, P. K. Tripathi and A. S. Joshi, Proc. of National
Laser Symposium 1998, Physical Research Laboratory, Ahmedabad,
India.
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Development of High Power Laser and
Relevant Technology in India, Proc. of IAEA Technical Committee
Meeting on Drivers and Ignition Facilities for Inertial Fusion,
A.S.Joshi, .P.Navathe, M.S.Ansari, M.P.Kamath, S.Bandyopadhyay,
A. Upadhyay, A.P.Kulkarni, P.K.Tripathi, P.Khare,
S.R.Patwa, J.D. Singh, N.Sreedhar, R.Chandra, M.N.Kumbhare and H. C.
Pant, March 1997, Osaka University, Osaka, Japan.
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Nd:YLF::Nd:Glass(Phosphate) Hybrid
Laser Oscillator for the High Power Glass Laser, M. P. Kamath,
A.S.Joshi, A. P. Kulkarni, A. Upadhyay, P. K. Tripathi,
S. R. Patwa, C. P. Navathe, M. S. Ansari, N. Sreedhar, R. Chandra
and M.N. Kumbhare, Proc. of National Laser Symposium 1997,
Center for Advanced Technology, Indore, India.
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Measurement of Beam Profile of Nd:YLF
Oscillator, A. Upadhyay and A. P. Kulkarni, Proc. of
National Laser Symposium 1996, Bhabha Atomic Research Center,
Mumbai, India
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A PC Based Shear Interferometer for
Laser Beam Wavefront Aberration Analysis, S.Bandyopadhyay, M.S.
Ansari, A. Upadhyay, P. Khare and C.P. Navathe, Proc.
of National Laser Symposium 1995, Instrument Research
Development Estabishment, Dehradun, India.
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