Abstract
The ATF2 project is the final focus system prototype for the ILC and CLIC linear collider projects, with a purpose to reach a 37 nm vertical beam size at the interaction point using compact optics based on a novel scheme of local chromaticity correction. Construction of all components and installation were completed at the end of 2008. An initial commissioning phase followed in 2009, using larger than nominal $\ensuremath{\beta}$ functions at the interaction point, corresponding to reduced demagnification factors in comparison to the design, to limit effects from higher-order optical aberrations and hence simplify beam tuning procedures while key instrumentation was being tested and calibrated. In this paper, first measurements of dispersion and Twiss parameters are presented based on scanning the beam during this period with a set of tungsten wires located just behind the interaction point, using two complementary analysis methods.
Highlights
ATF2 [1,2] is a test facility for ILC [3] and CLIC [4] type final focus systems based on local chromaticity correction [5]
The wire scanners installed behind the interaction point (IP) at ATF2 were assembled from two different similar systems used in the SLAC final focus test beam [10]
First ATF2 beam waist measurements were reported using the post-IP tungsten wire scanner, including the procedures to deal with dispersion and the finite size of the wire
Summary
ATF2 [1,2] is a test facility for ILC [3] and CLIC [4] type final focus systems based on local chromaticity correction [5]. The first complete beam waist measurements at the ATF2 IP were done during the Spring commissioning in 2009 These measurements were used to provide first estimates of Twiss parameters at the IP and of the horizontal emittance, before implementing systematic optical corrections. By fitting parabolic dependencies to the measured data as a function of the QD0 magnet currents, the parameters in (1) could be determined For both the emittance and function to be determined simultaneously, it is essential to resolve the minimum beam size at the waist. A few prospects towards the systematic implementation of the described methods during beam size minimization at the ATF2 IP are discussed in the last section
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
