Outstanding points for LIUSPS specifications V Kain H

Outstanding points for LIU-SPS specifications V. Kain, H. Bartosik, E. Carlier 1

SPS LIU BI specification q EDMS document available under q 1566197 v. 0. 1|SPS-B-ES-0003 v. 0. 1 Operational requirements for beam instrumentation for the SPS LIU beams by B. Dehning, B. Goddard, V. Kain, L. Jensen, T. Lefevre q Open points after engineering check: – BSRT optimum location – BGI new location q Will also mention (already part of the specification) – Prioritized locations for faster BLMs – Locations of wire scanners 21 April 2016 BI/TB meeting 2

BSRT q Currently installed in half-cell 521 – Large dispersion in H of 1. 3 m – Bunch-by-bunch differences of momentum spread large → uncertainty on average emittance measurement q New location proposal following MSWG presentation 9/10/2015 21 April 2016 BI/TB meeting 3

Alternative location for BSRT: 516 q Requirement to have enlarged quadrupole at 516 bx = 75 m Dx = -0. 25 m 21 April 2016 BI/TB meeting 4

BSRT Extraction Mirror - aperture requirements q Aperture requirements defined by slow extracted beam F. Velotti q Minimum required aperture from machine side: – Location 1: 53 mm, -64. 4 mm – Location 2: 50 mm, -56. 3 mm q Proposed extraction mirror position: – 60 to 70 mm from beam center 21 April 2016 BI/TB meeting Looks feasible. Integration to be checked. Availability of enlarged QF 516 to be checked. 5

BGI – alternative location for vertical 517 q Was already treated in BI/TB 21 st of January, 2016 E. Carlier 21 April 2016 BI/TB meeting 6

A propos wire scanner locations q From the specification SPS-B-ES-0003: – All vertical scanners should be placed at location 41677 and the horizontal scanners at location 51995. 2 scanners per plane should be available to have an operational and a spare system. 21 April 2016 BI/TB meeting 7

A propos fast BLMs q We cannot know where aperture bottlenecks will be introduced – Propose pragmatic approach q Location for fast BLMs pre-LS 2 – LSS 1: injection, beam dump, scrapers – BLM sun glasses at scrapers q Post-LS 2: – LSS 5 and LSS 1 21 April 2016 BI/TB meeting 8

Conclusion q BGI and BSRT locations are proposed. – BSRT location needs verification for a few aspects – Will follow up with Etienne and George q All other open points have been clarified – Except of continuous measurement of longitudinal parameters q Next step: – Update the specification with the latest clarifications 21 April 2016 BI/TB meeting 9