title: Measurements of aperture and beam lifetime using movable beam scrapers in Indus-2 electron storage ring.
abstract: In this paper, the measurements of vertical and horizontal aperture which are available for stable beam motion in Indus-2 at beam energy 2.5 GeV using movable beam scrapers are presented. These beam scrapers are installed in one of the long straight sections in the ring. With the movement of beam scrapers towards the beam centre, the beam lifetime is measured. The beam lifetime data obtained from the movement of vertical and horizontal beam scrapers are analyzed. The contribution of beam loss due to beam-gas scattering (vacuum lifetime) and electron-electron scattering within a beam bunch (Touschek lifetime) is separated from the measured beam lifetime at different positions of the beam scrapers. Vertical and horizontal beam sizes at scrapers location are estimated from the scraper movement towards the beam centre in quantum lifetime limit and their values closely agree with measured value obtained using X-ray diagnostic beamline.
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: Pradeep
authors.initials: P
authors.lastname: Kumar
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: A D
authors.initials: AD
authors.lastname: Ghodke
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Karnewar
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: A C
authors.initials: AC
authors.lastname: Holikatti
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: S
authors.initials: S
authors.lastname: Yadav
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: T A
authors.initials: TA
authors.lastname: Puntambekar
authors.affiliation: Raja Ramanna Centre for Advanced Technology, Indore 452013, India.
authors.forename: G
authors.initials: G
authors.lastname: Singh
authors.affiliation: Bhabha Atomic Research Centre, Mumbai, India.
authors.forename: P
authors.initials: P
authors.lastname: Singh