1. Engineering Department ENEN Consequences and Possible Cause of Elevated Collimator Temperatures Collimation Working Group 02.11.2015 L. Mettler, F. Carra, A. Bertarelli, M. Garlasche 2 November 2015L. Mettler – EN-MME1

2. Engineering Department ENEN  Consequences of elevated collimator temperatures  Discussion of “anomalous” temperatures recorded Outlook 2 November 2015L. Mettler – EN-MME2

3. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME3 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations

4. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME4 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations Acceptable collimator temperature: up to 50 o C Based on homogeneous T in steady state Impairs the vacuum → T and vacuum probes to trigger interlock Outgassing rate, e.g. of ferrites, scales exponentially with temperature

5. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME5 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations Specification for flatness in operation: 100µm Ensures efficient beam cleaning Error in flatness comprises Mechanical tolerance (~40 µm) Self-weight (~30 µm) Temperature distribution (~30 µm)

6. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME6 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations E.g. TCTP

7. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME7 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations E.g. TCTP

8. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME8 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations E.g. TCSG

9. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME9 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations E.g. TCSG

10. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME10 Elevated Collimator Temperatures  Outgassing  Flatness of active surface (jaw)  Plastic deformations Different CTEs and temperature gradients lead to thermal stress Irreversible deformation typically first on cooling pipes Should not impair the functioning of cooling Depends on design/materials, e.g. for tertiary collimator > 100 o C (based on simulations for quench test)

11. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME11 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

12. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME12 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1 beam intensity jaw water

13. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME13 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

14. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME14 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

15. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME15 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

16. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME16 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

17. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME17 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

18. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME18 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1 C-C AC150 St. Steel CuNi10Fe1Mn Glidcop

19. Engineering Department ENEN Collimator temperatures > 40 o C All fluctuations in water T synced → water seems to flow Fluctuations in water T too large to discern evacuated heat Jaw and water T “uncoupled” → consistent with radiative cooling, τ ≈ 14 h Calibration offset in jaw temperatures Thermal loads estimated from heating curves (5.54 W per jaw in fill 4467) Since jaw T is homogeneous → no thermal morphing Cooling pipes wrongly connected 2 November 2015L. Mettler – EN-MME19 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

20. Engineering Department ENEN beam intensity jaw water 2 November 2015L. Mettler – EN-MME20 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

21. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME21 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

22. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME22 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

23. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME23 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

24. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME24 Anomalous Temperature Recordings  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1 R4550 Graphite St. Steel CuNi10Fe1Mn Glidcop

25. Engineering Department ENEN Collimator temperatures ≈ 60 o C Big gradient along jaw → FE model inaccurate; Outgassing not critical Water T appears to reflect heat evacuation (but T in unknown) Cooling performance within expected range (τ < 7 min) Is the quick cooling / gradient along jaw physical or does RF invalidate temperature probes? Keep an eye on vacuum and beam quality 2 November 2015L. Mettler – EN-MME25 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

26. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME26 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

27. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME27 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

28. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME28 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

29. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME29 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

30. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME30 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

31. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME31 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1

32. Engineering Department ENEN 2 November 2015L. Mettler – EN-MME32 Elevated Collimator Temperatures  TCSP_A4R6_B1  TCLIA_4L8  TCSG_A5R3_B1 Modest collimator temperatures ≈ 30 o C Water ∆T large – may not be flowing or heated by other components Cooling is slow (τ > 1h) Check if water flowing