Summary
Overview
Work History
Education
Skills
Languages (spoken & written)
Timeline
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PRAGNESH BALUBHAI DHORAJIYA

PRAGNESH BALUBHAI DHORAJIYA

Dallas,TX

Summary

Dynamic Scientific Assistant with over 22 years of extensive experience in plasma research, dedicated to advancing scientific knowledge and innovation. Currently contributing expertise at the Institute for Plasma Research, collaborating closely with Dr. Paritosh Chaudhuri to drive impactful research initiatives that push the boundaries of the field. Recognized for the ability to analyze complex data and support experimental design while fostering a collaborative environment that enhances team productivity and project outcomes. Committed to continuous learning and the application of cutting-edge techniques, consistently solving challenging scientific problems and inspiring others in the pursuit of excellence.

Overview

23
23
years of professional experience

Work History

Scientific Assistant - E

Institute for Plasma Research
11.2002 - 05.2025
  • Company Overview: Institute For Plasma Research, an R & D organization under Department of Atomic Energy, Govt. of India is a premier organization working across the globe in Controlled Nuclear Fusion Research development and Industrial Plasma Applications.
  • Working in RF-ECRH Group of ADITYA and SST-1 tokamaks (plasma confinement Device), I am involved and have got hand on experience on following major tasks –
  • Gyrotron (82.6 GHz) for Steady State Superconducting Tokamak-1: An 82.6 GHz ECRH (Electron Cyclotron Resonance Heating) system on SST-1 would be used for various experiments like start-up, heating and MHD control. The Gyrotron delivers 200kW power at 82.6 GHz frequency, which corresponds to fundamental harmonic at 3.0 tesla operation and second harmonic ECRH at 1.5 tesla operation toroidal magnetic field of SST-1. The Gyrotron procured from M/s. Gycom Russia.
  • Design and Development and fabrication: Rogowski based dI/dT interlock for Gyrotron protection. Development and fabrication of two series ignitron crowbar sysyem and it is tested up to –45 KV. Installation and commissioning of High Voltage power supply, Anode modulated power supply, filament power supply, vac-ion power supply and inter connection of all these subsystem with gyrotron .Operation of High Voltage power supply during the Gyrotron operation.
  • Commissioning of cooling system for Gyrotron: The cooling system is commisioned in the SST1 hall to supply the required flow at rated pressure. Coonection of all cooling Lines from cooling header to gyrotron’s subparts and operating and visual monitioring of cooling system of gyrotron.
  • Commissioning of Transmission Line system: The ECRH transmission line is commissioned with proper support and alignment. The high power test is carried out and burn pattern at the exit of line near tokamak ensure gaussian beam. This work is done with the support from Engineers of M/s Gycom Russia.
  • CVD (Chemical Vapor Deposition)diamond window test: The scheme of CVD window test is reviewed and finalized a new method to test CVD window on dummy load. In this scheme two mirrors are fabricated by M/s Gycom and mirror box is fabricated by our group (IPR) This mirror system will work as an interface between CVD window and dummyload.
  • Experiment Setup: Layout Design and preparation, Transfer the liquid helium and liquid nitrogen through the transfer line, He level meter installation.
  • System Installation: The 82.6 GHz gyrotron is installed with water dummyload at SST1 hall.The gyrotron is tested in pulse condition. The burn pattern achieved at the exit of matching optic unit ensures good gaussian output from the gyrotron. The gyrotron is tested in CW mode and tested for ~170 kW power/1000sec.
  • System Maintenance: Routine maintenance and testing of the 28.6 GHz and 82.6 Gyrotron system in Aditya and SST-1
  • Designed and testing of ECRH launchers: Involvement in the designed and tested of ECRH launchers (one low field side and one high field side) for SST-1. I am also involved in experiment of Remote Steering Launcher for ECRH system.Beam steering for Current Drive is achieved by rotating the mirrors of launcher.alternatively it could be achieved rectangular/square-corrugated waveguide(SCW). Symmetric beam steering is achieved at a length L (8a2/λ), where ‘a’ is width of waveguide and ‘λ’ is wavelength of microwave while at L/2 (4a2/λ), anti-symmetric steering is seen.
  • Gyrotron (28 GHz) for ADITYA Tokamak: The 28 GHz ECRH system is used to carry out Preionization experiment on ADITYA tokamak.Approximately 30 to 50 kW power in fundamental O-mode is launched from low field side.The toroidal magnetic field of Aditya is varied from .75T to 0.84T.
  • Vacuum and Cryogenic system experience: UHV testing, installation, operation and maintenance of the TMP’s, Rotary Van pump, and electro-pneumatic Gate Valves UHV Testing of cryomagnet, CVD (Chemical Vapor Deposition) diamond window UHV Testing of various vacuum components of ECRH & Ion Cyclotron Resonance Heating system, Diagnostic parts and measurements for Out-gassing. He testing of various system components before the final installation.
  • Present research is to work on exsisting ECRH systems on Aditya and SST-1.Alongwith the existing 28 GHz and 82.6GHz Electron Cyclotron Resonance Heating system for Aditya and SST-1, a new 42 GHz ECRH system is finalized to carry out ECRH assisted start-up in Aditya and SST-1.
  • A 42 GHz ECRH system is designed and in advance stage of procurement to carry out various experiments on plasma start-up, heating and current drives in tokamaks Aditya and SST-1. Involvement during the 2.45 GHz ECRH assisted breakdown Experiment on ADITYA Tokamak.
  • Supervisor: Mr. B. K. Shukla (2002-20015) (Scientific Officer - H), Dr. Paritosh Chaudhuri (2015-20025)

Education

Bachelor of Science - Physics

South Gujarat University
India
01.2000

M.Sc (Distance education) - Electronic science

Annamalai University
01.2010

Skills

  • Basic understanding of programming languages including C and C
  • Microsoft Office proficiency
  • Vacuum system instrumentation
  • High voltage operations

Languages (spoken & written)

Gujarati, Hindi, English

Timeline

Scientific Assistant - E

Institute for Plasma Research
11.2002 - 05.2025

Bachelor of Science - Physics

South Gujarat University

M.Sc (Distance education) - Electronic science

Annamalai University

Publications

  • Paper Published/Communicated in Journals:

1. Test and Commissioning of 82.6 GHz ECRH system on SST-1. Dhiraj Bora, K. Sathyanarayana, B. K. Shukla, Prabal Chattopadhyay, Y. S. S. Srinivas, P. L. Khilar, Mahesh Kushwah, Kumar Rajnish, Manoj Singh, Rajan Babu, Jatin P., Agrajit G., Prabal Biswas, Pragnesh D., M Shmelev, V Belousov, V Kurbatov, Yu Belov and E Tai, et al, Journal of Physics 25(2005)96-102

2. Cyclotron resonance heating systems for SST-1. Dhiraj Bora, Sunil Kumar, Raj Singh, K. Sathyanarayana, S.V. Kulkarni, A. Mukherjee, B.K. Shukla, P. Khilar, M. Kushwah, Rajnish Kumar, D. Pragnesh, M. Shmelev, V. Belousov, V. Kurbatov, Yu Belov and E. Tai, et al, Nuclear fusion 46(2006) S72-S84.

3. A prototype experiment on remote steering antenna for ECRH system. B. K. Shukla, K. Sathyanarayana, P. Chattopadhyay, Pragnesh Dhorajiya and Dhiraj Bora, Fusion Science and Technology, vol.52, July (2007)

4. Low power experiment on remote steering of microwave beam through square corrugated waveguide B. K. Shukla, K. Sathyanarayana, P. Chattopadhyay, Pragnesh Dhorajiya and Dhiraj Bora, Proceeding of international Conference on sub millimeter Science and Technology, ICSST-04, Ahmedabad,2004.

5. High power test of CVD diamond window for ECRH system in SST-1. B. K. Shukla, Rajan Babu, Mahesh Kushwah, K Sathyanarayana, Jatin Patel, S. Laxmikant Rao, Pragnesh Dhorajiya, Mikhail Shmelev, Yury Belov and Vladimir Belousov, et al, M/s. Gycom, IAP, Nizhny Novgorod, Russia (SP3-18, ICOPS 2011 SOFE , 38th international conference on Plasma Science and 24th Symposium on Fusion Engineering, June 2011)

6. 42Ghz 0.5MW ECRH System forTokamak SST-1 and ADITYA. B. K. Shukla, R. Goswami, P.K. Chattopadhyay, R. Srinivasan, R. Babu, J. Patel, H. patel, P. Dhorajiya and ECRH, (SP3-19, ICOPS 2011 SOFE , 38th international conference on Plasma Science and 24th Symposium on Fusion Engineering, June 2011)

  • Paper presented in International conference:

1. EC wave in SST-1: preliminary study on plasma start up. B. K. Shukla,R. Srinivasan, Prabal Chattopadhyay, Jatin Patel, Rajan Babu, Pragnesh dhorajiya and ECRH Group, International symposium on wave, coherent structure and turbulence in plasma, 12-15 Jan, 2010, IPR, Gandhinagar, India.

2. Commissioning of 82.6 GHZ Electron Cyclotron Resonance Heating system on SST1 Tokamak. K.Sathyanarayana, B.K.Shukla, D. Bora, Mahesh Kushwah, P. L. Khillar, Pragnesh D., 4thIAEA Tm on SSO magnetic fusion device and MHD of advanced scenarios 1-5 Feb,2005, Ahmedabad, India

Paper presented in National conference:

1. Remote Steering of Microwave Beam through Square corrugated wave guide. B. K. Shukla, Pragnesh dhorajiya and ECRH Group, 18 th National symposium on Plasma Science Society of India, PLASMA-2003, Dec 7-10 2003, Birla nstitute of Technology, Ranchi (India).

2. Ultra High Vacuum compatible Microwave Beam Launcher for ECRH in SST-1, B.K.Shukla, K.Sathyanarayana, P. Biswas, Pragnesh D. and Dhiraj Bora, National Symposium on Vacuum Science AND Technology and its application to plasmas, Indian Vacuum Society National Symposium-2005, Nov, 16-18 2005,Institute for Plasma Research, India.

3. Lower low voltage startup of aditya tokamak using 28 GHz ECRH system. B. K. Shukla, Pragnesh dhorajiya and ECRH Group, 20 th National symposium on Plasma Science Society of India, PLASMA-2005, Dec 5-7 2005, Cochin (India).

4. Design and Development of Micro-controller based calorimetric power measurement for high power microwave tubes. Dharmesh Purohit, Pragnesh Dhorajiya, Rajan Babu, Jatin Patel, Harshita Patel, K. Sathyanarayana, B. K. Shukla and S. V. Kulkarni, 23rd National symposium on Plasma Science Society of India, PLASMA-2008, Dec 10-13-2008, BARC, Mumbai (India).

5. Design and Development of dI/dT protection for 82.6 GHz gyrotron. N. Rajan Babu, K. sathyanarayana, Pragnesh B Dhorajiya, and ECRH Group, 24 th National symposium on Plasma Science Society of India, PLASMA-2009, Dec 2009, NIT , Hamirpur HP (India).

6. Development of software for monitoring and control of water-cooling for 82.6 GHz Gyrotron. Jatin kumar Parel, Pragnesh Dhorajiya, , K. Sathyanarayana and ECRH Group, 24 th National symposium on Plasma Science Society of India, PLASMA-2009, Dec 2010, NIT, Hamirpur HP (India)

7. Development of crowbar firing card for ignitron-crowbar system. Harshida Patel, D. Purohit, B. K. Shukla, Jatin Patel, K. sathyanarayana, Pragnesh B Dhorajiya, Rajan Babu, et al, 25 th National symposium on Plasma Science Society of India, PLASMA-2010, Dec 8-11 2010, IASST, Gawahati (India).

8. High power CWtest of 82.6 GHz Gyrotron. B. K. Shukla, Mahesh Kushwah, Rajan Babu, Jatin Patel, K. Sathyanarayana, Slaxmikant Rao, Pragnesh Dhorajiya, Harshida Patel, Sunil Belsare, 25 th National symposium on Plasma Science Society of India, PLASMA-2010, Dec 8-11 2010, IASST, Gawahati (India).

9. Testing and commissioning of solid state anode modulator power supply for 82.6 GHz gyrotron system, N. Rajan Babu, B. K. Shukla, K. sathyanarayana, Sunil Belsare, Pragnesh B Dhorajiya, Jatin Patel and Harshida Patel, 25 th National symposium on Plasma Science Society of India, PLASMA-2010, Dec 8-11 2010, IASST, Gawahati (India).

10. Ultra high vacuum compatible water-cooled interface system for SST-1 ICRH system. A.Mukherjee, D. Rathi, Siju George, S.Dani, A. Varia, Pragnesh D, Dhiraj Bora & RF Group Institute for Plasma Research, Bhat, Gandhinagar – 382428

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