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Deshpande, P. P.

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

Abstract Views :342 | PDF Views:82

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.

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Chemical composition of Low Moor and Walker Company cannons in the Odisha State Maritime Museum, east coast of India

Abstract Views :211 | PDF Views:82

Authors

Sila Tripati ¹, Rudra Prasad Behera ², N. G. Rudraswami ¹, P. P. Deshpande ³

Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 Department of Archaeology, Government of Odisha, Bhubaneswar 751 014, IN
3 Department of Metallurgy and Materials Science, College of Engineering, Pune 411 005, IN

Source

Current Science, Vol 122, No 8 (2022), Pagination: 965-973

Abstract

Cannons are military or civil weapons supported on carriages or fixed mounts and used in warfare as well as against rebellions. Now, most of the cannons are exhibited in museums, forts, public and private buildings, and open places. Moreover, historical documents provide information on different types of forge-welded or cast cannons, which were manufactured both in India and abroad. Like in other museums, six iron cannons are housed at the Odisha State Maritime Museum, Cuttack, Odisha, India. Among them, two Low Moor (LM) cannons are displayed at the museum’s main entrance, one LM and a Walker Company (WC) cannon are exhibited adjacent to the dockyard located in the museum, and two smaller cannons are displayed in the museum gallery. Similarly, two LM and two WC cannons are displayed at Residency, Lucknow, Uttar Pradesh, which were deployed during the First War of India’s independence in 1857. None of the LM and WC cannons has displayed a considerable degree of corrosion despite their exposure to the open environment for a long duration. Electron microscopy studies of the LM and WC cannons of the Odisha State Maritime Museum were carried out to ascertain corrosion and decay. This study deals with the results of chemical analysis of the LM and WC cannons, emphasizing the fact that the corrosion rate of these cannons is significantly less than other cannons of India.

Keywords

Cannons, chemical analysis, corrosion rate, decay, museums.

Full Text

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