Beam Loss, Protection and Transfer Lines Working Group

1. LHC Injectors Upgrade Project Beam Loss, Protection and Transfer Lines Working Group Progress of the Working Group LIU-SPS Coordination Meeting, 13 June 2012 Prepared by Öznur Mete on behalf of the WG members • TCDI Studies • Scraper Studies • FLUKA and ANSYS Studies • Radiation Protection

2. TCDI Studies: TI 2 – Eliana Gianfelice • Objective: find new location for the TCDIs in order to avoid downstream beam showers which are caught by the LHC BLMs, and trigger beam dumps • Mitigation: Shielding added at the end of 2010 reduced the effects of the showers produced by TCDIV.29234 and TCDIH.29205 by a factor 2 or 3. No sufficient for LIU beam specs. • In progress: BLM sunglasses New locations for protection devices • Based on work done by V. Kain, CERN-THESIS-2005-047, Eliana Gianfelicestudied new possible locations :

3. TCDI Studies: TI 8 – Eliana Gianfelice • Mitigation: Extra shielding has been added during March 2011 stop leading to improvement of about a factor 3 for the worst BLMs, i.e. BLMQI.07R8.B2E20 and BLMQI07R8.B2E10,. No sufficient for LIU beam specs. • Eliana Gianfelicestudied new possible locations : TCDI Studies: summary • New locations have been found for collimators in TI2 and TI8 (Q26 and Q20 optics) • All optics and beam specification have been provided for FLUKA simulations to Alessio. • For details: • LIU-SPS BL-P-TL-WG meeting, 21 Sept. 2011 (TI2): • https://edms.cern.ch/document/1162635/1 • LIU-SPS BL-P-TL-WG meeting, 05 Oct. 2011 (TI8): • https://edms.cern.ch/document/1164642/1

4. SPS scraper studies: new possible location - Öznur Mete • LSS1, LSS2 (already activated) and LSS3 are full of equipment • LSS4 was studied – dropped due to RP concerns • Alternative locations : LSS5 and LSS6 • LSS5 houses UA9 experiment and intentionally being kept unoccupied (as much as possible). • Consider LSS6 as the primary region LSS6 Horizontal scraping located between 619-620 with 3 existing MPLH magnets. Vertical scraping located between QDA.619-QF.620 with 2 existing and 2 new vertical bumpers.

5. SPS scraper studies- Öznur Mete • From operational experience : required amount of scraping from? 3σ scraping ? • Beam based tests are ongoing by using the SPS scraper BSHV.11771 in order to determine the beam loss points and orbit stability (ABT in collaboration with Karel Cornelis, Lene Drosdal, Eliana Gianfelice, Verena Kain, Alessio Mereghetti, Oznur Mete, Helga Timko, Eric Veyrune). • Simulation studies are ongoing with SPS orbit effects • For details: LIU-SPS BL-P-TL-WG meeting, 16 May 2012 (Scrapers @ LSS6): https://edms.cern.ch/document/1218316/1 LIU-SPS BL-P-TL-WG meeting, 30 May 2012 (Orbit effects): https://edms.cern.ch/document/1220150/1 When decision taken: integration studies by Frederic Galleazzi

6. FLUKA studies – Alessio Mereghetti - EN/STI/EET, UoM (UK)

7. FLUKA studies – Alessio Mereghetti - EN/STI/EET, UoM (UK) Upcoming Actions • ANSYS studies were started regarding the stress issues on TCDI – material resistance ? New material, length? Cooling ? (in collaboration with Alessio Mereghetti, Oliver Aberle, Fausto Maciariello).

8. Others upgrades for SPS – Karel Cornelis, Verena Kain, Jörg Wenninger • Upgrade of the SPS MP systems? • TT10 BLMs: at all TT10 Quads, specs given – request made to BI – Lars Jensen • Interlocks for the new scrapers and collimators for TI 2/8 - under study • For details: • LIU-SPS BL-P-TL-WG meeting, 20 Oct. 2011 (Machine protection): • https://edms.cern.ch/document/1166807/1

9. Beam Losses: estimation from CNGS - Jörg Wenninger • Losses in the SPS associated with the CNGS beam has been considered for the estimates of the LIU scraping. • For details: • LIU-SPS BL-P-TL-WG meeting, 25 Jan. 2012 (CNGS losses): • https://edms.cern.ch/document/1182426/1

10. Radiation Protection: First Dose Estimates for ECX4 - Helmut Vincke • First estimates concerning influence of the scraping operation in ECX4 on the radiation environment in ECX4/ECA4 were carried out. • These estimates are based on old calculations which partly resemble the scraping situation in ECX4. • Both prompt dose rate and residual dose rate caused by the scraping operation in ECX4 will have a severe impact on the radiation environment in ECA4 and ECX4. • The current area classifications of ECA4 will have to be changed from Supervised Radiation Area to a higher level. This change implies stronger constraints concerning access, dose and job planning and dosimeter requirements. • The need for more accurate simulations has to be considered. Manpower for these calculations has to be found. • For details: • LIU-SPS BL-P-TL-WG meeting, 25 Jan. 2012 • https://edms.cern.ch/document/1195087/1 Critical Area Calculated for a beam loss rate 1.23E13 protons/s

11. Progress - Plans • TCDI: • New locations found for TCDI in TI2 and TI8 for both Q26 and Q20 optics, Specs for Flukka calculations - done, Eliana Gianfelice • Flukka studies: Energy deposition on jaws and downstream elements – done for Q20, to be done for Q26 - Alessio Mereghetti • ANSYS studies: to be done - Oliver Aberle, Fausto Maciariello • SPS beam scrapers: • Possible scraping locations investigated for both Q26 and Q20 optics. Approved location is LSS6 – being finalised, Öznur Mete • Integration studies for the new bumpers for LIU scrapers - done for the SS4 case, Frédéric Galleazzi, Jérémie Bauche – to be done for LSS6 • Flukka studies: Energy deposition and loss patterns –to be done, Alessio Mereghetti • Dose rate due to the beam loss during scraping was estimated in the light of the CNGS beam loss measurements and the previous FLUKA studies - done, Jörg Wenninger, Helmut Vincke – Assess activation in LSS6 - Helmut Vincke • Beam tests: Scraping of the full beam and estimate orbit stability & check with simulation - ongoing, Karel Cornelis, Lene Drosdal, Eliana Gianfelice, Verena Kain, Alessio Mereghetti, Oznur Mete, Helga Timko, Eric Veyrune • Flukka studies for other devices (LHC TDI, TCLIs, SPS TPSG 4 TPSG6) • More: SPS beam dump system (TIDVG, TIDH, MKDH, MKDV) ...