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Kumar, Arvind

B. M. Udgaonkar (1927–2014)

Combustion Science Workshop

First Lasing in an Infrared Free Electron Laser at RRCAT, Indore

Abstract Views :337 | PDF Views:79

Authors

K. K. Pant ¹, Vinit Kumar ¹, Bhaskar Biswas ¹, Arvind Kumar ¹, Shankar Lal ¹, Sona Chandran ¹, Saket Kumar Gupta ¹, Md. Khursheed ², Pravin Nerpagar ¹, A. K. Sarkar ¹, Ravi Kumar Pandit ¹, K. Ruwali ³, K. Sreeramulu ³, S. Das ³, R. S. Shinde ³, S. Chouksey ⁴, J. K. Parate ⁴, Viraj Bhanage ⁵, P. P. Deshpande ⁵, Shradha Tiwari ⁵, Mandar Joshi ⁶, Lalita Jain ⁵, Anand Valecha ⁷, Ayukt Pathak ⁵, M. A. Ali ⁵, H. R. Bundel ⁵, Purushottam Shrivastava ⁸, T. Reghu ⁸, Umesh Kale ⁸, Yashwant Wanmode ⁸, Praveen Mohania ⁸, Jaikishan Mulchandani ⁸, Akhil Patel ⁸, Mahesh Acharya ⁸, Ashish Mahawar ⁸, Mahendra Lad ⁹, M. K. Jain ⁹, Nitesh Tiwari ⁹, Pritam S. Bagduwal ⁹, V. G. Sathe ¹⁰, Sujata Joshi ¹⁰, Ram Shiroman ¹⁰, A. S. Yadav ¹⁰, Randhir Kumar ¹⁰, Alok Singh ¹¹, Vineet K. Dwivedi ¹¹, Mangesh Borage ¹², S. R. Tiwari ¹¹

Affiliations
1 Materials and Advanced Accelerator Sciences Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
2 Advanced Lasers and Optics Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
3 Accelerator Magnet Technology Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
4 Design and Manufacturing Technology Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
5 Laser Controls and Instrumentation Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
6 Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, IN
7 Accelerator Control Systems Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
8 Pulsed High Power Microwave Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
9 Radio Frequency Systems Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
10 Ultra-High Vacuum Technology Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
11 Power Converters Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN
12 Homi Bhabha National Institute, Raja Ramanna Centre for Advanced Technology, Indore 452 013, IN

Source

Current Science, Vol 114, No 02 (2018), Pagination: 367-373

Abstract

An Infrared Free Electron Laser (IR-FEL) designed to operate in the 12.5–50 μm wavelength band is presently in an advanced stage of commissioning at the Raja Ramanna Centre for Advanced Technology (RRCAT), Indore. Here we report results from first experiments on the IR-FEL after installation of its optical cavity, which has resulted in a power output that is ~105 times the expected spontaneous emission power for the beam parameters used in the experiment. The estimated out-coupled peak micro-pulse power during these experiments is ~2 kW. This is the first observed signature of lasing in the IR-FEL, and the first reported lasing in a FEL in India. This communication discusses the development of the IR-FEL, the recent experimental results, and the ongoing efforts to further increase the IR power to the design peak out-coupled power of 2 MW.

Keywords

Beam Parameters, Free Electron Laser, Infrared Power, Undulator.

Full Text

References

Cohn, K., Blau, J., Colson, W. B., Ng, J. and Price, M., Free electron lasers in 2015. In Proceedings of Free Electron Laser Conference, Korea, 23–28 August 2015, p. 625.

Kumar, V. et al., Design of an infra-red free electron laser at RRCAT. In Proceedings of InPAC, IUAC, New Delhi, 2011.

Kumar, A., IRFEL injector simulations. In Proceedings of InPAC 2009, RRCAT, Indore, 2009.

Kumar, G. et al., Installation, testing and commissioning of 10 kW pulse RF amplifier system @ 476 MHz using planar triode for IRFEL. In Proceeding of InPAC 2015, TIFR Mumbai, 2015; Tiwari, N. et al., Development and deployment of CW and pulse digital low level RF systems for accelerators at RRCAT. In Proceeding of InPAC 2015, TIFR Mumbai, 2015.

Praveen, M. et al., Design and development of low level S-band RF control system for IRFEL injector Linac. In Proceeding of InPAC 2015, TIFR Mumbai, 2015; Shrivastava, P., Status of 24 MW microwave system and LLRF control for IR-FEL linac. RRCAT Newsl., 2016, 29(1).

Singh, A. et al., Power supplies for IRFEL beam transport line magnets. In Proceeding of InPAC 2015, TIFR, Mumbai, 2015.

Saini, R. S. et al., Electron beam optics design of variable energy beam transport line for a tunable infra-red free electron laser at RRCAT. In Proceedings of InPAC 2011, IUAC, New Delhi, 2011.

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Kailash, R. et al., Development of magnets for infra-red free electron laser project at RRCAT. In Proceeding of InPAC 2015, TIFR Mumbai, 2015.

Agronomic Biofortification of Zinc in Wheat (Triticum Aestivum L.)

Abstract Views :264 | PDF Views:82

Authors

Arvind Kumar ¹, Manas Denre ¹, Ruplal Prasad ¹

Affiliations
1 Department of Soil Science and Agricultural Chemistry, Birsa Agricultural University, Kanke, Ranchi - 834006, IN

Source

Current Science, Vol 115, No 5 (2018), Pagination: 944-948

Abstract

Zinc malnutrition poses a major health issue for human beings globally. Agronomic bio-fortification explores the feasibility to control the zinc deficiency related disorders of the human population. Field experiment was conducted in a red and lateritic soil of Ranchi on 23 wheat cultivars with soil and foliar applications of ZnSO₄ ⋅ 7H₂O. Zinc content of wheat grain increased from 38.86 to 77.17 mg/kg with soil application and to 76.49 mg/kg with soil + foliar application of Zn. Total Zn uptake by wheat (grain + straw) cultivars with soil + foliar application of Zn was significantly higher in short (933 g/ha) and long (960 g/ha) duration cultivars compared to that with soil application. Apparent Zn recovery in wheat also improved with soil + foliar application of Zn fertilizer, suggested that agronomic bio-fortification of zinc is possible in wheat and can prevent Zn malnutrition in human beings to a considerable extent.

Keywords

Agronomic, Biofortification, Triticum Aestivum L., Red And Lateritic Soil, Zinc Deficiency.

Full Text

References

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Design and Evaluation of a Pneumatic Metering Mechanism for Power Tiller Operated Precision Planter

Abstract Views :283 | PDF Views:84

Authors

Sandip Mandal ¹, G. V. Prasanna Kumar ², Hetal Tanna ³, Arvind Kumar ⁴

Affiliations
1 Central Institute of Agricultural Engineering, Nabibagh, Bhopal 462 038, IN
2 Department of Agricultural Engineering, Triguna Sen School of Technology, Silchar 788 001, IN
3 College of Agricultural Engineering and Technology, Anand Agricultural University, Godhra 389 001, IN
4 ICAR Research Complex for NEH Region, Umiam 793 103, IN

Source

Current Science, Vol 115, No 6 (2018), Pagination: 1106-1114

Abstract

Power tiller is the most common prime mover in medium and marginal farms due to its light weight, compact design and low cost. Many attachments for power tiller have been developed except for precision pneumatic planter which is necessary to plant irregular, small and expensive seeds. In the present work, a pneumatic seed metering mechanism was designed for the power tiller operated 3-row precision planter. It was tested for planting soybean, pigeon pea and corn seeds at 20 cm spacing. The best design and operating parameters of the modular seed metering device were identified by conducting experiments on the sticky belt test stand considering various performance indices on the basis of pareto dominance criterion. The seed metering disc having 8 holes of 3.5 mm diameter on pitch circle diameter of 116 mm and operated at 0.11 ms^–1 peripheral speed and 6 kPa suction were found to be the best combination of design and operating parameters for the precise metering of seeds. More than 67% of the seeds got distributed in the range of 15–20 cm spacing.

Keywords

Pareto Dominance, Pneumatic Seed Metering, Power Tiller, Precision Planter.

Full Text

References

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Effect of defoliation on tree growth of Populus deltoides Bartr. ex Marsh in India

Abstract Views :141 | PDF Views:91

Authors

Arvind Kumar ¹, Jitendra Kumar ¹, Girish Chandra ²

Affiliations
1 Forest Entomology Discipline, Forest Protection Division, Forest Research Institute, PO-New Forest, Dehradun 248 006, India, IN
2 Division of Statistics, Indian Council of Forestry Research and Education, PO-New Forest, Dehradun 248 006, India, IN

Source

Current Science, Vol 123, No 10 (2022), Pagination: 1268-1273

Abstract

To assess the impact of artificial leaf defoliation of Populus deltoides on its different growth parameters, a study was conducted on G-48 clone under field condition and four defoliation treatments, i.e. 25%, 50%, 75% and 100%, were done in addition to control. Defoliation pattern was simulated with insect defoliator Clostera spp. feeding and the experiment was conducted from July to December. Significant variation was observed in tree height and DBH growth loss in all the treatments with respect to control, and 24.16–66.03% volume increment loss was observed under 25–100% leaf defoliation respectively

Keywords

Artificial defoliation, Clostera species, growth loss, Populus deltoides.

Full Text

References

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