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S. Das ¹, K. Sreeramulu ¹, Ashok Kumar ¹, B. Srinivasan ¹, R. S. Shinde ¹

Affiliations
1 Accelerator Magnet Technology Division, Raja Ramanna Centre for Advanced Technology, Indore -452013, IN

Abstract

Synchrotron users in Indus-2 require stable photon beams for performing various scientific experiments. At the source points of the photons, typical requirement of the beam position stability is ≤ 10 % of the r.m.s size of the electron beam. This stability requirement demands correction of beam orbit disturbances in the range from DC to 100 Hz. The existing slow corrector magnets in Indus-2 are used for correction of very slow disturbances e.g. thermal drift. Therefore a separate set of combined function corrector magnets of high bandwidth were developed for correction of short term perturbations (from low to high frequency up to 100 Hz). These fast corrector magnets have relatively weak kick strengths of ≥ ± 50 μrad at 15 A DC. The magnetic measurements show no appreciable attenuation in the field strength of these magnets up to 200 Hz. The design, development of the fast corrector magnets and the results achieved by using them in the fast orbit feedback system of Indus-2 will be discussed in this paper.

Keywords

Fast Correctors, Synchrotron, Air Core Magnets, Beam Stability, Feedback System.

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K. Sreeramulu ¹, P. K. Kulshreshta ¹, Vanshree Thakur ¹, Kailash Ruwali ¹, Lakshman Singh ¹, Ashok Kumar ¹, B. Srinivasan ¹, Anil Kumar Mishra ¹, R. S. Shinde ¹

Affiliations
1 Raja Ramanna Centre for Advanced Technology, Indore-452013, IN

Abstract

Close type quadrupole magnets for Indus-2 require highly homogeneous magnetic field to focus electron beam. The field uniformity is governed by magnet geometry besides its steel quality. Magnets were developed with improved techniques and optimized for higher order multipole fields. This paper discusses development of magnets with magnetic measurement results.

Keywords

Close-Type Quadrupole, Field Gradient, Multipole Fields, Harmonic Bench.

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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

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.

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