SPS dose forecast foreseen safety installations Update following

SPS dose forecast foreseen safety installations Update following MC WG 17. 10. 2016 Elisa Guillermain elisa. guillermain@cern. ch

Outputs from last MC WG meeting • See slides on https: //indico. cern. ch/event/577094/ • Scaling with distance • Factor 10 agreed • Scaling with time • What will influence the dose has been identified • Main contributions are SHIP, new collimator. • How this will influence the dose is not yet known ! Ø Conservative scaling = considering each years will be the same in terms of dose depending on the location in the tunnel… • Data 2014 + 2015 used so far • MC WG asked for same analysis without 2014 BLM data • MC WG asked for same analysis with 2011 + 2012 data MC WG - 07. 11. 2016 2

BLM and RPL in SPS ring Cable tray RPL position 08 BLM position 08 Beam line RPL position 20 • BLM data is yearly • RPL data is for two years • For example 2011 + 2012; 2014 + 2015 MC WG - 07. 11. 2016 3

SPS Tunnel cross section Installation zone of foreseen systems ≈ 150 cm SPS beam line m 5 c ≈ 17 ≈ 100 cm Still open questions • Is this the same decrease factor in the ARCs and in the LSSs ? • For both the transport side wall and the ceiling ? ≈ 30 cm Tray RPL Coil RPL And BLM Decrease factor at the transport wall and at the ceiling considered to be the same Ø Factor 10 MC WG - 07. 11. 2016 4

SPS Geometry • SPS geometry • 6 sextants of 1152 m • With 36 periods of 32 meters • Periods divided in 100 elements numbers • 6910 meters in total • BLM positions given in sextant, period, element • Idem for RPL • Transformed in meters for plotting • See histogram below • Error lower than +/- 7 meters, except for 11 locations (up to -29 m and +67 meters) LSS 1 Beam dump Injection from PS with TT 10 LSS 2 Extraction to North area with TT 20 LSS 3 LSS 4 Extraction to LHC or CNGS / AWAKE with TT 40 LSS 5 LSS 6 Extraction to LHC or Hi. Rad. Mat with TT 60 MC WG - 07. 11. 2016 5

SPS Schedule • LS 1 : SPS shut down from Feb. 2013 up to Feb. 2014 • During LS 1, some SPS elements were changed or moved, leading to a modification of the machine performance (beam optics modified), etc… • After LS 1, BE-OP tuned the magnets, leading to a different beam optics than before LS 1. • Advices from last MC WG: • Best to use only 2015 data since Year 2014 was not yet fully optimized (first months after LS 1). Ø Exclusion of 2014 BLM data (not possible for RPL…) Ø Use of 2015 data for BLM and (2014+2015)/2 for RPL. • Doses in 2014 +2015 were lower than before LS 1 Ø In 2011 + 2012 the CNGS experiment was running and responsible for a non -negligible part of the SPS dose. Ø Advice using 2011 + 2012, probably the most representative, and possibly data for worst case conditions. MC WG - 07. 11. 2016 6

SPS in 2014 – 2015 As shown during 18. 10. 2016 MC WG - 07. 11. 2016 7

Yearly doses as recorded by BLM and RPL in both 2014 + 2015 MC WG - 07. 11. 2016 8

Yearly doses recorded in both 2014 + 2015 and divided by 10 for distance MC WG - 07. 11. 2016 9

SPS in 2015 But RPL data cannot be 2015 only ! ØCompared to 2014 + 2015 data, BLM 2014 data is removed… MC WG - 07. 11. 2016 10

Yearly doses as recorded by BLM in 2015 and by RPL in both 2014 + 2015 MC WG - 07. 11. 2016 11

Yearly doses recorded by BLM in 2015 and by RPL in both 2014 + 2015 and divided by 10 for distance MC WG - 07. 11. 2016 12

Comparison of 2014 + 2015 data with RPL 2014 + 2015 and BLM 2015 Max increase factor is of 1. 85 MC WG - 07. 11. 2016 13

SPS in 2011 – 2012 (In 2013, SPS stopped in Feb…) MC WG - 07. 11. 2016 14

Yearly doses as recorded by BLM and RPL in both 2011 + 2012 MC WG - 07. 11. 2016 15

Yearly doses recorded in both 2011 + 2012 and divided by 10 for distance MC WG - 07. 11. 2016 16

Comparison of 2014 + 2015 data with 2011 + 2012 data Max increase factor is of 30 MC WG - 07. 11. 2016 17

The future MC WG - 07. 11. 2016 18

Possible options • Rough scaling • But then we do not know what is the dose in specific areas • How to asses the functioning in each zone ? • Assess what will influence the dose • Influences were spotted (intensity increase (LINAC 4 and HL-LHC), SHIP, new collimator)(CRAB not an issue…) • Increase factors are not know ! • Increase in intensity is unknown • Influence of modification / upgrade of the machine on the dose is unknown • Need a crystal ball for predicting the future? • Do a linear scaling from the yearly doses… • Done with 2014+2015 data • Now with 2011+2012 data • Will need to get back on these and check variability across the years ! MC WG - 07. 11. 2016 19

At beam – From 2011+2012 data MC WG - 07. 11. 2016 20

At beam – From 2014+2015 data MC WG - 07. 11. 2016 21

At wall – From 2011+2012 data MC WG - 07. 11. 2016 22

At wall – From 2014+2015 data MC WG - 07. 11. 2016 23

Will be future be like 2011+2012 ? Or like 2014+2015 ? Or…? MC WG - 07. 11. 2016 24

Estimated accumulated doses From data 2014+2015, at transport wall Area Dose / year 2014 5 years / 2015 dose 10 years dose 20 years dose 40 years dose Arcs Below 200 Gy 800 Gy in Arc 1+ 1 k. Gy 4 k. Gy 2 k. Gy 8 k. Gy 4 k. Gy 16 k. Gy 8 k. Gy 32 k. Gy LSS 1 10 k. Gy 50 k. Gy 100 k. Gy 200 k. Gy 400 k. Gy LSS 2 55 k. Gy 275 k. Gy 550 k. Gy 1, 1 MGy 2, 2 MGy LSS 3 300 Gy 1, 5 k. Gy 3 k. Gy 6 k. Gy 12 k. Gy LSS 4 125 Gy 625 Gy 1, 25 k. Gy 2, 5 k. Gy LSS 5 350 Gy 1, 75 k. Gy 3, 5 k. Gy 7 k. Gy 14 k. Gy LSS 6 55 Gy 275 Gy 1, 1 k. Gy 2, 2 k. Gy 550 Gy In Sextant 4 and Sextant 6, the accumulated dose is higher in the Arc+ than in the LSS MC WG - 07. 11. 2016 25

Estimated accumulated doses From data 2014+2015, excluding BLM 2014, at transport wall Area Dose / year 2014 5 years / 2015 dose 10 years dose 20 years dose 40 years dose Arcs Below 200 Gy 800 Gy in Arc 1+ 300 Gy in Arc 2 - 1 k. Gy 4 k. Gy 1, 5 k. Gy 2 k. Gy 8 k. Gy 3 k. Gy 4 k. Gy 16 k. Gy 8 k. Gy 32 k. Gy 12 k. Gy LSS 1 10 k. Gy 50 k. Gy 100 k. Gy 200 k. Gy 400 k. Gy LSS 2 100 k. Gy 500 k. Gy 1 MGy 2 MGy 4 MGy LSS 3 300 Gy 1, 5 k. Gy 3 k. Gy 6 k. Gy 12 k. Gy LSS 4 125 Gy 625 Gy 1, 25 k. Gy 2, 5 k. Gy LSS 5 350 Gy 1, 75 k. Gy 3, 5 k. Gy 7 k. Gy 14 k. Gy LSS 6 55 Gy 275 Gy 1, 1 k. Gy 2, 2 k. Gy 550 Gy MC WG - 07. 11. 2016 26

Estimated accumulated doses From data 2011+2012, at transport wall Area Dose / year 2011 / 2012 5 years dose 10 years dose 20 years 40 years dose Arc 3+ 2, 5 k. Gy 12, 5 k. Gy 25 k. Gy 50 k. Gy 100 k. Gy Arc 1+ 1, 75 k. Gy 8, 75 k. Gy 17, 5 k. Gy 35 k. Gy 70 k. Gy Arc 2+ and Arc 4+ 1 k. Gy 5 k. Gy 10 k. Gy 20 k. Gy 40 k. Gy Other Arcs Below 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy LSS 1 100 k. Gy 500 k. Gy 1 MGy 2 MGy 4 MGy LSS 2 250 k. Gy 1, 25 MGy 2, 5 MGy 10 MGy LSS 3 100 Gy 500 Gy 1 k. Gy 2 k. Gy 4 k. Gy LSS 4 3 k. Gy 15 k. Gy 30 k. Gy 60 k. Gy 120 k. Gy LSS 5 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy LSS 6 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy In Sextant 3, the accumulated dose is higher in the Arc+ than in the LSS Vs 2, 2 MGy with the 2014 -2015 data… MC WG - 07. 11. 2016 27

Comparison of 2011+2012 and 2014+2015 MC WG - 07. 11. 2016 28

Proposal for irradiation test dose steps 2014+2015 data, divided by 10 for distance Area Dose / year 2014 / 2015 5 years dose 10 years dose 20 years dose 40 years dose Arcs Below 200 Gy 800 Gy in Arc 1+ 1 k. Gy 4 k. Gy 2 k. Gy 8 k. Gy 4 k. Gy 16 k. Gy 8 k. Gy 32 k. Gy LSS 1 10 k. Gy 50 k. Gy 100 k. Gy 200 k. Gy 400 k. Gy LSS 2 55 k. Gy 275 k. Gy 550 k. Gy 1, 1 MGy 2, 2 MGy LSS 3 300 Gy 1, 5 k. Gy 3 k. Gy 6 k. Gy 12 k. Gy LSS 4 125 Gy 625 Gy 1, 25 k. Gy 2, 5 k. Gy LSS 5 350 Gy 1, 75 k. Gy 3, 5 k. Gy 7 k. Gy 14 k. Gy LSS 6 175 Gy 875 Gy 1, 75 k. Gy 3, 5 k. Gy 7 k. Gy 2 k. Gy, 10 k. Gy, 500 k. Gy, 1 MGy, 3 MGy MC WG - 07. 11. 2016 29

Proposal for irradiation test dose steps 2011+2012 data, divided by 10 for distance Area Dose / year 2011 / 2012 5 years dose 10 years dose 20 years 40 years dose Arc 3+ 2, 5 k. Gy 12, 5 k. Gy 25 k. Gy 50 k. Gy 100 k. Gy Arc 1+ 1, 75 k. Gy 8, 75 k. Gy 17, 5 k. Gy 35 k. Gy 70 k. Gy Arc 2+ and Arc 4+ 1 k. Gy 5 k. Gy 10 k. Gy 20 k. Gy 40 k. Gy Other Arcs Below 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy LSS 1 100 k. Gy 500 k. Gy 1 MGy 2 MGy 4 MGy LSS 2 250 k. Gy 1, 25 MGy 2, 5 MGy 10 MGy LSS 3 100 Gy 500 Gy 1 k. Gy 2 k. Gy 4 k. Gy LSS 4 3 k. Gy 15 k. Gy 30 k. Gy 60 k. Gy 120 k. Gy LSS 5 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy LSS 6 500 Gy 2, 5 k. Gy 10 k. Gy 20 k. Gy 5 k. Gy, 25 k. Gy, 150 k. Gy, 500 k. Gy, 2 MGy, 5 MGy, 10 MGy MC WG - 07. 11. 2016 30

Consequences of each proposal • From 2014 / 2015 data • 2 k. Gy, 10 k. Gy, 500 k. Gy, 1 MGy, 3 MGy • @ 10 k. Gy/h (BGS pallet) • Irradiation time is 15 days • Cost is about 20’ 000 € for 1 pallet • From 2011 / 2012 data • 5 k. Gy, 50 k. Gy, 200 k. Gy, 500 k. Gy, 2 MGy, 5 MGy, 10 MGy • @ 10 k. Gy/h (BGS pallet) • Irradiation time is 45 days • Cost is about 50’ 000 € for 1 pallet MC WG - 07. 11. 2016 31

Still open questions • Radiation levels in the TAs, at both levels ? • Installation of Rad. Fets or Bat. Mons in TA 2 ? • Will require at least one year of integration ! • In PA 6 for Crab cavities : 1 Gy/year • Radiation levels in the shafts • Fabrice Malacrida contacted -> Not suitable ! • Possibility of installing Rad. Fets ? • Fire doors positions • Shall get back when the exact position is defined • Or give inputs so that the doors are not placed at worst positions • Some LSS limits seems to accumulated quite high radiation levels ! MC WG - 07. 11. 2016 32

Thanks for your attention !