Present status of CERN capsules Elvis Fornasiere CERN

Present status of CERN capsules Elvis Fornasiere CERN, Geneva (CH) On behalf of CERN BLIP Project, EN-STI-TCD

Outline Ø Assembly of the high-Z capsule Ø Corrective actions and second design Ø Timeline E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Assembly of high-Z capsule prototype I E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Assembly of high-Z capsule prototype II E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Assembly of high-Z capsule prototype III Ø Thin capsule of 2. 21 width led to 2 mm of deformation with the present design Ø We attribute the deformation of the piece after E-beam welding to four main factors. They are summarized here with corrective actions taken: 1. The gap between the pieces was too large and by welding "it pulls" too much on the pieces. • Solution: We reduced the gap to a tolerance H 6 g 6 to the diameter. This represent a gap between 10 to 48 microns to the diameter 65. 2. The e-beam welding thickness was important • Solution: The reduction of the gap in 1 allows a reduction in the e-beam welding thickness. We will weld on 0. 3 mm thickness (instead of values > 0. 5 before). This should reduce the "pulling and deformation" on the pieces. 3. The e-beam welding pulled on piece and deformed it • Solution: We machined grooves next to the welding in order to create a lip that will deform at the place of the piece. The lips are 0. 5 mm wide and 1. 2 mm deep. 4. The process of stress relief annealing was omitted. • Solution: Pieces are stress relief is realized before the final machining. Ø Additionally: in parallel production of “two windows” version as plan B E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Corrective actions and second design E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Timeline Ø Second test foreseen this week Ø Final pieces arriving from this week till end of December Ø Final assembly end of December/beginning of January E. Fornasiere Present status of CERN capsules CERN BLIP Project, Geneva (Switzerland), 29 th November 2016 29. 11. 2016

Elvis Fornasiere Ph. D Student @ CERN – EN-STI-TCD BLIP Project elvis. fornasiere@cern. ch