LSS 5 Impedance Optimization Aaron Farricker Christine Vollinger
- Slides: 8
LSS 5 Impedance Optimization Aaron Farricker & Christine Vollinger Acknowledgements: Diogo Murteira & Chiara Pasquino IWG#21 26/06/2018 1
Introduction • During LS 2 the internal beam dump of the SPS is being redesigned and relocated from LSS 1 (SPS injection region) to LSS 5 • This gives the opportunity to optimize LSS 1 and LSS 5 for impedance • The optimization of LSS 1 was presented at IWG#16 • Here we will go through the layout in stages looking at the optimizations suggested and which will be implemented • LSS 5 is the topic of ECR#1964856 IWG#21 26/06/2018 2
General Changes • All pumping ports are shielded as in LSS 1 • Anywhere that a non circular beam pipe is used has racetrack bellows rather than round • The beam dump shielding is ongoing with tests on the proposed braided shield ongoing with TE/VSC IWG#21 26/06/2018 3
SPS. 51610 to SPS. 51710 • Chamber after the QFA is changes to a QFA type pipe • Racetrack bellows are used to reduce the impedance • Request to transition from the MBA after the MDHW to a 156 mm pipe using a taper is ongoing • It would require changing the 156 mm pipe in the MDHW to an MBA • The new BSRT will be installed between the racetrack bellows using a tank similar to the ZS interconnect IWG#21 26/06/2018 4
SPS. 51810 to SPS. 51910 • The two pumping modules will be shielded internally using curved screens • The BTV is in the process of being optimized and will be presented at the IWG in the coming weeks IWG#21 26/06/2018 5
SPS. 51810 to SPS. 51910 • 86 mm bellows have been produced for in the connection between the masks • Therefore we need to try to maintain this aperture • The masks should be tapered to 86 mm on the pumping side • The pumping modules will be shielded down to 86 mm using internal shields • VVSB->VVSA (reduced size) IWG#21 26/06/2018 6
SPS. 51910 to SPS. 52010 • Movement of the XRP next to the BCTDC would resolve the issues here • This will utilize the original taper on the fast BCT • The pumping module will be shielded internally IWG#21 26/06/2018 7
Other Objects • The design of the BSRT is being studied with BE/BI and the design office-> Idea is to utilize the work done on the ZS interconnects to minimize the impedance • Design of the BTV is being finalized with large improvement compared to the huge BTV in LSS 1 • The shielding of the beam dump is being studied with the upstream end being concluded o The downstream end needs to take a 3 cm compression stroke in a 10 cm length regularly o Shielding this in a high radiation, high mechanical movement area is posing issues which are being worked through IWG#21 26/06/2018 8
