SPS DAY Aperture History 01/19/2016 Stéphane Cettour Cavé

Outline  Aperture history  Table to calculate beam size  Aperture restriction found over time

Aperture history

Table to calculate the beam size faisceauchambre à vide place libre Beta Vdim. (mm)dim. V. (mm)%(mm) input BWSV * BWSV BWSV QF MBA MBA MBB MBB QD Damper ZS north ZS north ZS north ZS north ZS north Beam dump test

Aperture restriction found over time Vertical Beam size measured since 1995 YearsSize WS51995Actions mmScraper BBSR out mmReplacement of the MBA2137 (Hot spot) mmBeam dump alignment & magnet alignment mmReplacement of two ZS of North extraction with an aperture restriction which came from the plates of the ion traps mmAlignment check 2.19 à 2.20 Alignment check between 2.35 et 2.36 we found a hot spot in MBA We found inside dipole a part of a ball bearing Beam based alignment mmWe found the beam crashed inside a dipole Search aperture restriction in 217, 218 Beam based alignment mmReplacement dipole Search aperture restriction in 217, 218 Beam based alignment mm mmSearch aperture restriction in 217, 218 Beam based alignment

Aperture restriction found over time Vertical Beam size measured since 1995 YearsSize WS51995Actions 2013We found a misalignment on TCE and its vacuum chamber deformed with a beam crash, we replaced TCE We changed the TPST in LSS2 We correct the vertical plane in sextant 6, dog leg re-alignment, uninstalled all LSS1 for the cabling campaign mmBeam based alignment to favour Q20 optics mmOptimisation with bumps 2016???We found a misalignment on BIPMH We found a magnet with beam crash in (replaced) Removed kick on QD215, QD217, QD311, QD313, QD317, QD619, QD623, QD627 Alignment of all quadrupoles in the machine

Bal bearing inside dipole Hot spot measured in 2007 around 309 The part was extracted with the endoscopy

Beam crash inside dipole Hot spot measured in 2008 Magnet removed

TCE Position in BA2

Measurment of the alignment TCE TCE E:3.6mm TCE S:3.4mm

Vertical plane correction in LS1

Beam crash in 10130

Survey RP sextant 5 Location 1Location 2Location 3 Location 4 Location 5 PointLocation Reading [1/100mm]Height [m]dh[m] 1Chamber DS from VVSB mm too high (corresponding to bellow offset with removed shim on pumping port) 2Chamber US from MDHW Chamber US from BIPMH Also too low ( can not be explained with results from BIPMH jig) 4Chamber DS from BIPMH Also too low ( can not be explained with results from BIPMH jig) 5Chamber DS from MDHW51637 (hot spot) Offset confirming aperture restriction in vertical direction 6Chamber between Dipole and Quite close to nominal E Reference Theo from DB S

Thanks for your attention