1. What’s Inside a TESLA Cryomodule Tom Peterson Proton Driver Meeting February 9, 2005

2. February 9, 2005, Proton Driver Meeting Tom Peterson2 TTF cryomodule

3. February 9, 2005, Proton Driver Meeting Tom Peterson3 TTF cryomodule

4. February 9, 2005, Proton Driver Meeting Tom Peterson4 TTF cryomodule

5. February 9, 2005, Proton Driver Meeting Tom Peterson5 Sources of Information Slides and information from: –Bernd Petersen, Lutz Lilje, Axel Matheisen, Nick Walker, Hans Weise, and others (DESY) –Carlo Pagani (INFN) –Terry Garvey (LAL-Orsay) –Tom Nicol (Fermilab) –Don Mitchell (Fermilab) –John Weisend (SLAC) –TESLA TDR (March 2001)

6. February 9, 2005, Proton Driver Meeting Tom Peterson6 Recommended! The video of Hasan Padamsee’s presentations here this past December 14 - 17 will soon be available from Fermilab’s Visual Media Services as a DVD or streaming video This will include the video of the TTF module assembly process, which Hasan showed us on December 17

7. February 9, 2005, Proton Driver Meeting Tom Peterson7 Also packed with information... http://ilc.desy.de/e627/e634/e730/e745/index_eng.html –Links to talks presented by Lutz Lilje, Axel Matheisen, W.- D. Mueller, Bernd Petersen, Nick Walker, and others at our December 6 - 7, 2004, module meeting at DESY http://lcdev.kek.jp/ILCWS/ –“First ILC workshop,” November 13 - 15, 2004 at KEK http://tesla-new.desy.de/content/index_eng.html –DESY TESLA page with link to the TESLA Design Report and other information including talks and posters from the March 2004 ITRP visit

8. February 9, 2005, Proton Driver Meeting Tom Peterson8 Look at TTF module CAD models and photos Updated module drawings are promised from DESY, but we do not have them yet TTF module (TTF-III) features vs. TDR –Eight structures per module (12 in TDR) –Quadrupole at the end of the module (TDR placed it at the center) –Invar rods fix modules axially (both TTF-III and TDR) Upgrades for X-FEL (and probably for us) –Place the quad at 2 K –Cold shield can then be 5 - 8 K –Quad may move to the center of the module

9. February 9, 2005, Proton Driver Meeting Tom Peterson9 Cryomodule--helium vessels in the vacuum vessel CAD model by Don Mitchell, Fermilab

10. February 9, 2005, Proton Driver Meeting Tom Peterson10 Cryomodule--helium vessels in the vacuum vessel with input couplers and the quadrupole CAD model by Don Mitchell, Fermilab

11. February 9, 2005, Proton Driver Meeting Tom Peterson11 Some TESLA Requirements (from John Weisend, July 2004) ComponentTransverse tolerance Axial tolerance Rotational tolerance Cavity+/- 0.5 mm+/- 5 mm- Quadrupole+/- 0.2 mm+/- 5 mm0.1 mrad Temperature LevelPredicted Static Heat Leak ( W ) 70 K76.8 4.5 K13.9 2 K2.8

12. February 9, 2005, Proton Driver Meeting Tom Peterson12 TESLA cryogenic unit

13. February 9, 2005, Proton Driver Meeting Tom Peterson13

14. February 9, 2005, Proton Driver Meeting Tom Peterson14 TESLA Cryogenic System Overview Saturated He II cooled cavities @ 2 K Helium gas thermal shield @ 5 - 8 K Helium gas thermal shield @ 40 - 80 K Two-phase line (liquid helium supply and concurrent vapor return) connects to each helium vessel Two-phase line connects to gas return once per module A small diameter warm-up/cool-down line connects the bottoms of the He vessels (primarily for warm-up) Subcooled helium supply line connects to two-phase line via JT valve once per “string” (~10 modules)

15. February 9, 2005, Proton Driver Meeting Tom Peterson15

16. February 9, 2005, Proton Driver Meeting Tom Peterson16 TTF cryomodules #4 through #8

17. February 9, 2005, Proton Driver Meeting Tom Peterson17

18. February 9, 2005, Proton Driver Meeting Tom Peterson18

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20. February 9, 2005, Proton Driver Meeting Tom Peterson20

21. February 9, 2005, Proton Driver Meeting Tom Peterson21

22. February 9, 2005, Proton Driver Meeting Tom Peterson22 Active Tuner Actively compensate the detuning of the cavity during the RF pulse by mechanical means to reduce power consumption Piezoelectric elements are suitable for this application (heavily used for fuel injection in car industry) Proof-of-principle done A lot of engineering needed –Choice of tuner –Choice of Actuator –… From Lutz Lilje Dec 04 presentation

23. February 9, 2005, Proton Driver Meeting Tom Peterson23

24. February 9, 2005, Proton Driver Meeting Tom Peterson24 Blade tuner concept

25. February 9, 2005, Proton Driver Meeting Tom Peterson25 Helium vessel string in clean room

26. February 9, 2005, Proton Driver Meeting Tom Peterson26 Helium vessel string in clean room

27. February 9, 2005, Proton Driver Meeting Tom Peterson27 Cavity Interconnect

28. FNAL Module February 9, 2005, Proton Driver Meeting Carlo Pagani 28 Module assembly picture gallery – 3 bis Internal details

29. February 9, 2005, Proton Driver Meeting Tom Peterson29

30. February 9, 2005, Proton Driver Meeting Tom Peterson30

31. February 9, 2005, Proton Driver Meeting Tom Peterson31

32. February 9, 2005, Proton Driver Meeting Tom Peterson32

33. February 9, 2005, Proton Driver Meeting Tom Peterson33 TTF helium vessel string

34. February 9, 2005, Proton Driver Meeting Tom Peterson34 300 mm gas return pipe as structural support Standard tolerances for high-quality welded pipe (+/- 5 mm), including straightness Lower post flanges, end flanges, and cavity supports are welded to the pipe Pipe weldment is stress relieved The axis defined by end flange centers is transferred to the lower post flanges Cavity support flanges are machined relative to pipe axis Similar procedure for vacuum vessel for post-weld machining of upper post flanges and coupler port flanges

35. February 9, 2005, Proton Driver Meeting Tom Peterson35 TTF helium vessel string

36. February 9, 2005, Proton Driver Meeting Tom Peterson36 Helium vessel supports

37. February 9, 2005, Proton Driver Meeting Tom Peterson37 Runner Pad Rolling needles C-shaped support Spring Washers Four C-shaped stainless steel elements clamp a titanium pad welded to the helium tank. Rolling needles reduce drastically the longitudinal friction Cavities are independent from the elongation and contraction of the HeGRP. Lateral and vertical position are defined by reference screws Longitudinal position can be fixed by the use of an Invar rod Cavity supports principle From Lutz Lilje, Dec 04 presentation

38. February 9, 2005, Proton Driver Meeting Tom Peterson38 Moving cavity string to cantilever

39. February 9, 2005, Proton Driver Meeting Tom Peterson39 Support posts

40. February 9, 2005, Proton Driver Meeting Tom Peterson40 Thermal shield installation

41. February 9, 2005, Proton Driver Meeting Tom Peterson41 Thermal shield installation

42. February 9, 2005, Proton Driver Meeting Tom Peterson42 Vacuum shell installation

43. February 9, 2005, Proton Driver Meeting Tom Peterson43 TTF cryomodule

44. February 9, 2005, Proton Driver Meeting Tom Peterson44 TTF cryomodule

45. February 9, 2005, Proton Driver Meeting Tom Peterson45 Module end

46. February 9, 2005, Proton Driver Meeting Tom Peterson46

47. February 9, 2005, Proton Driver Meeting Tom Peterson47 Some History of Changes in Design Features for TTF Cryomodule Three “generations” of TTF cryomodule designs TTF-I was module #1 TTF-II was modules #2 and #3 TTF-III is modules #4 - #8 X-FEL modules will differ in some details from TTF TDR called for some significant changes from all of the above such as a longer module with 12 cavities per module

48. February 9, 2005, Proton Driver Meeting Tom Peterson48 TTF cryomodules #2 and #3

49. February 9, 2005, Proton Driver Meeting Tom Peterson49

50. February 9, 2005, Proton Driver Meeting Tom Peterson50 3 rd Generation Cryomodule Allows for fixed couplers –Invar rod and roller bearings allow cavities to remain fixed while the 300 mm tube shrinks Eccentric disks are gone –More intuitive alignment results Smaller cross section results in standard pipe size for outer vessel Axial position of last support changed to stiffen structure near quadrupole

51. February 9, 2005, Proton Driver Meeting Tom Peterson51 Helium vessels Original design was to flow through helium vessel, no separate 2- phase pipe Smaller vessel has advantages but limits heat transfer from the cavity to around 30 W For CW operation or other high heat load operation of a few cavities, one could consider reverting to this type of helium vessel

52. February 9, 2005, Proton Driver Meeting Tom Peterson52 TDR cryomodule main features Based on 3 rd generation TTF cryomodule design, but ~17 m as opposed to 12 m. 38 inch OD carbon steel vacuum vessel. Two thermal shields, at 5-8 K and 40-80 K. MLI on both shields, the cavity helium vessels, and the gas return pipe. Twelve 9-cell cavities, quadrupole, steering dipole, BPM. Magnetic shielding is integral to the cavity helium vessel. Cryogenic piping is integral to the cryomodule vessel. More elaborate scheme for fixing cavity position axially

53. February 9, 2005, Proton Driver Meeting Tom Peterson53 TDR 17 meter module fixed pts