1. Dose Measurements S. Roesler (DGS-RP) Collimation WG – IR3 passive absorbers 4 June 2012

2. 2 Outline Collimation WG – IR3 passive absorbers 4 June 2012 - Measurements 1) Ambient dose equivalent manual radiation survey (AD6 survey instrument), TS1 25/04/12 PMI readings 2) Absorbed dose high level dosimetry (RPL dosimeters), 2011 (preliminary) Thanks to: F.Jaquenod, C.Tromel, J.Tummer, H.Vincke - Comparison IR3 vs IR7 - Scaling to nominal operational parameters and comparison to simulations for IR7

3. 3Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Ambient dose equivalent (survey 25/04/12) Survey: 25/04/12

4. 4Collimation WG – IR3 passive absorbers 4 June 2012 Survey: 25/04/12 IR3 – Ambient dose equivalent (survey 25/04/12)

5. 5Collimation WG – IR3 passive absorbers 4 June 2012 12 µSv/h6.5 µSv/h6.3 µSv/h5.1 µSv/h IR3 – Ambient dose equivalent (PMI readings 31/01/12)

6. 6Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Absorbed dose (2011) 4.2 kGy (LSXL3-19) 5.2 kGy (LSXR3-19)

7. 7Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Absorbed dose (2011) 1.8 kGy (LSXL3-18) 1.8 kGy (LSXR3-18)

8. 8Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Absorbed dose (2011) 300 Gy (LSXL3-16)

9. 9Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Absorbed dose (2011) 5.2 kGy (LSXL3-13) 1.9 kGy (LSXR3-14)

10. 10Collimation WG – IR3 passive absorbers 4 June 2012 Survey: 25/04/12 IR7 – Ambient dose equivalent (survey 25/04/12)

11. 11Collimation WG – IR3 passive absorbers 4 June 2012 Survey: 25/04/12 IR7 – Ambient dose equivalent (survey 25/04/12)

12. 12Collimation WG – IR3 passive absorbers 4 June 2012 Survey: 25/04/12 IR7 – Ambient dose equivalent (survey 25/04/12)

13. 13Collimation WG – IR3 passive absorbers 4 June 2012 Survey: 25/04/12 IR7 – Ambient dose equivalent (survey 25/04/12)

14. 14Collimation WG – IR3 passive absorbers 4 June 2012 IR7 – Absorbed dose (2011) 10.0 kGy (LSXL7-24) 9.2 kGy (LSXR7-22)

15. 15Collimation WG – IR3 passive absorbers 4 June 2012 IR7 – Absorbed dose (2011) 6.6 kGy (LSXL7-18) 5.6 kGy (LSXR7-18)

16. 16Collimation WG – IR3 passive absorbers 4 June 2012 IR3 vs. IR7 – Absorbed dose D3 (2011) 10.0 kGy (LSXL7-24) 9.2 kGy (LSXR7-22) 4.2 kGy (LSXL3-19) 5.2 kGy (LSXR3-19) IR3 IR7

17. 17Collimation WG – IR3 passive absorbers 4 June 2012 IR3 vs. IR7 – Absorbed dose Q5 (2011) IR3 IR7 6.6 kGy (LSXL7-18) 5.6 kGy (LSXR7-18) 5.2 kGy (LSXL3-13) 1.9 kGy (LSXR3-14)

18. 18 IR7- Right January 2011 January 2012 January 2013 (Jan.2011 x fac.15) January 2017 (Jan.2011 x fac.54) ElementContactAisle Contact B1/B2 Aisle (1m) ContactAisleContactAisle TCP.D610.01.231/766150.018.0540.065.0 TCP.C618.02.5275/34516270.038.0970.0135.0 TCP.B631.03.1300/56040465.047.01670.0170.0 TCAPA70.03.01100/860351050.045.03780.0160.0 TCAPB13.01.2145/20313195.018.0700.065.0 TCSG.A68.01.5450/45028120.023.0430.080.0 TCAPC65.02.5870/84016975.038.03510.0135.0 Dose equivalent rates (μSv/h) Measurements Extrapolations Collimation WG – IR3 passive absorbers 4 June 2012 IR7 – Scaling to nominal parameters

19. 19 Dose equivalent rates (μSv/h) (about two months cooling) IR7-RightJanuary 2013 Nominal (Jan.2013 x factor 3.6) ElementContactAisleContactAisle TCP.D6150.018.0540.065.0 TCP.C6270.038.0970.0135.0 TCP.B6465.047.01670.0170.0 TCAPA1050.045.03780.0160.0 TCAPB195.018.0700.065.0 TCSG.A6120.023.0430.080.0 TCAPC975.038.03510.0135.0 S.Roesler et al., EDMS 863919 reasonable agreement for passive absorber dose rate somewhat lower than predicted for first secondary collimator (due to initial settings?) Collimation WG – IR3 passive absorbers 4 June 2012 IR7 – Scaling to nominal parameters

20. 20 Dose equivalent rates (μSv/h) IR3-RightJanuary 2011 January 2012 January 2013 (Jan.2011 x fac.15) January 2017 (Jan.2011 x fac.54) ElementContactAisle Contact B1/B2 Aisle (1m) ContactAisleContactAisle TCP13.00.3180/886195.04.5702.016.0 TCAPA24.00.7440/3608360.011.01300.038.0 TCSG.57.50.2195/17212113.03.0405.011.0 MQWA.C9.0270/1765135.0490.0 Measurements Extrapolations Collimation WG – IR3 passive absorbers 4 June 2012 IR3 – Scaling to nominal parameters

21. 21 Summary Collimation WG – IR3 passive absorbers 4 June 2012 measurement results exist from 1) PMI ionization chambers (ambient dose equivalent) 2) dedicated radiation surveys (ambient dose equivalent) 3) HLD (absorbed dose in air) direct comparison with simulation results for the operational conditions of 2011 not (yet) available, scaling of measured residual dose rates to nominal operational parameters indicated rough agreement (within factor 2-5) with simulations for IR7 measurements show asymmetry between beam 1 and 2 for both IR3 and 7, doses higher by about a factor of two for beam 1 residual dose rates higher in IR7 as compared to IR3 (factor of 10 for passive absorber in in front of D3), ratio between both probably different for number of lost protons due to different layouts (e.g., number and location of collimators and absorbers) absorbed doses upstream of D3 and Q5 yokes (at the locations of the dosimeters!) higher for IR7 (factor of 2-5), conclusions on peak dose requires simulations