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Dive into the research topics where Gurnam Singh is active.

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Featured researches published by Gurnam Singh.


Review of Scientific Instruments | 2008

Design and characterization of combined function multipole magnet for accelerators

Gautam Sinha; Gurnam Singh

This paper presents the design and analysis of a multipurpose combined function magnet for use in accelerators. This magnet consists of three corrector magnets: (i) skew quadrupole, (ii) horizontal dipole, and (iii) vertical dipole magnets, along with the main sextupole magnet. The strength of the corrector magnets is smaller than that of the main sextupole magnet. The strength of all the four magnets can be varied independently. The excitation strength required to produce skew quadrupole gradient and the presence of various multipole components in the magnet are estimated using first order perturbation theory. The experimental data for the variation of the sextupole strength and its higher order multipoles in the presence of skew quadrupole excitations are presented and compared to the theoretical predictions. Simulation using two-dimensional fine element code, Poisson, is also done. Results obtained from all the above three methods are found to be in good agreement with each other. The variations of skew quadrupole gradient for different sextupole excitations are also measured. The validity of this theory is also checked for various combinations of excitations including the case where magnet gets saturated. The excitation strengths required for producing the horizontal and vertical dipole fields are estimated analytically along with the presence of various multipoles. Theoretical predictions of permissible multipoles are compared to the results obtained from simulation.


Review of Scientific Instruments | 2015

Beam emittance reduction during operation of Indus-2

Ali Akbar Fakhri; Pradeep Kant; Gurnam Singh

Indus-2 storage ring is a 2.5 GeV third generation synchrotron radiation source. This source was commissioned using a moderate optics. Beam injection was accomplished using an off momentum electron beam to avoid difficulties faced in storage of beam at 550 MeV. The injection procedure and relevant beam dynamical studies are discussed. The switch over from the moderate optics to low emittance optics is done at 2.5 GeV after storing the electron beam. The procedure evolved to reduce the beam emittance and its implementation during the operation is discussed.


Review of Scientific Instruments | 2015

An analytical study of double bend achromat lattice

Ali Akbar Fakhri; Pradeep Kant; Gurnam Singh

In a double bend achromat, Chasman-Green (CG) lattice represents the basic structure for low emittance synchrotron radiation sources. In the basic structure of CG lattice single focussing quadrupole (QF) magnet is used to form an achromat. In this paper, this CG lattice is discussed and an analytical relation is presented, showing the limitation of basic CG lattice to provide the theoretical minimum beam emittance in achromatic condition. To satisfy theoretical minimum beam emittance parameters, achromat having two, three, and four quadrupole structures is presented. In this structure, different arrangements of QF and defocusing quadruple (QD) are used. An analytical approach assuming quadrupoles as thin lenses has been followed for studying these structures. A study of Indus-2 lattice in which QF-QD-QF configuration in the achromat part has been adopted is also presented.


Review of Scientific Instruments | 2013

Studies of beam injection with a compensated bump and uncompensated bump in a synchrotron.

Ali Akbar Fakhri; S. K. Prajapati; Gurnam Singh

Synchrotron radiation sources Indus-1 and Indus-2 have a synchrotron as the common injector. A three kicker compensated bump injection scheme was employed for beam injection into this synchrotron. The stored beam current in the synchrotron is higher, when all the three kickers are operated at the same current than when kickers are operated at currents required to generate compensated bump. Beam dynamics studies have been done to understand why this happens. Theoretical studies indicate that higher stored current in the later case is attributed to smaller residual oscillations of injected beam. These studies also reveal that if the angle of the injected beam during beam injection is kept varying, the performance could be further improved. This is experimentally confirmed by injecting the beam on rising part of the injection septum magnet current pulse.


Archive | 2007

DESIGN OF THE TRANSFER LINE-2 FOR THE CTF-3 AT CERN

Amalendu Sharma; Gurnam Singh; Raja Ramanna


Pramana | 2013

Beam lifetime measurement and analysis in Indus-2 electron storage ring

Pradeep Kumar; Gurnam Singh


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2009

Optics design and second order longitudinal dispersion minimization in a bunch compressor transfer line for CTF3

Amalendu Sharma; Abdurrahim; Gurnam Singh


Vacuum | 2015

Dependence of loss rate of electrons due to elastic gas scattering on the shape of the vacuum chamber

Pradeep Kumar; Gurnam Singh; H. Vaishnav; Pitamber Singh


arXiv: Accelerator Physics | 2014

Dependence of loss rate of electrons due to elastic gas scattering on the shape of the vacuum chamber in an electron storage ring

Pradeep Kumar; Gurnam Singh; Pitamber Singh


Physical Review Special Topics-accelerators and Beams | 2013

Analytical expressions of transfer functions for a hard edge dipole magnet using a basic geometrical approach

Amalendu Sharma; Pitamber Singh; Abdurrahim; Gurnam Singh

Collaboration


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Ali Akbar Fakhri

Raja Ramanna Centre for Advanced Technology

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Amalendu Sharma

Raja Ramanna Centre for Advanced Technology

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Gautam Sinha

Raja Ramanna Centre for Advanced Technology

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Pitamber Singh

Bhabha Atomic Research Centre

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Pradeep Kumar

Raja Ramanna Centre for Advanced Technology

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Abdurrahim

Raja Ramanna Centre for Advanced Technology

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Anil Kumar

Indian Institute of Technology Kanpur

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B.P. Mandal

Banaras Hindu University

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H. Vaishnav

Raja Ramanna Centre for Advanced Technology

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