1. EuCARD WP 7 – High Field Magnets Task 2 – Support studies Task summary
Maciej Chorowski, Jaroslaw Polinski, Piotr Bogdan
Faculty of Mechanical and Power Engineering
EuCARD collaboration meeting – CERN

2. Content Aim of the WP7.2 task WP7.2 main achievements
WP7.2 main outstanding problems
WP7.2 status of the deliverables
Work to be done in the post-EuCARD time period

3. Task 7.2 – Support Studies
Sub–task Radiation resistance certification
Sub-task objective: qualification of the HFM coil electrical insulation materials for work under very large radiation doses
Sub-task scope:
Determination of certification scope:
selection of potential insulation material candidates
definition of certification irradiation type, doses and energy
definition of material properties to be tested and methods
Selection of irradiation source
Sample irradiation
Irradiated sample tests

4. Task 7.2 – Support Studies
Sub–task 2.2 – HFM thermal models and design
Sub-task Objectives: Models of the radiation heat deposition and removal from HFM coil (structure)
Sub-task scope:
Model of the radiation heat deposition in the HFM coil
Thermal characterization of the insulation materials
Thermal model of the HFM coil
Thermal model of the Nb3Sn dipole magnet

5. Radiation map for the Interaction Region Quadrupoles for LHC upgrade phase I
Courtesy R. Flukiger

6. Radiation spectrum at Q2a: 35m from Collision Point
Radiation type
Contents, %
Influence on magnet coil materials
Neutrons
4.82
SC and Cu
Protons
0.14
Photons (g)
88.93
Insulation
Electrons
4.31
small effect
Positrons
2.23
Pions +
0.19
probably small effect
Pions -
0.26

7. Photon spectrum on the inner coil of Q2a at the peak location – FLUKA simulation
Dose – min. 50MGy
Courtesy R. Flukiger

8. Photons spectra from electron linac
Courtesy S. Wronka
Photons spectra for electron collision with target made of 1mm thick tungsten and 0.2mm thick gold

9. EuCARD insulators certification conditions
Radiation type: electron beam, E>1MeV
Integrated radiation dose – 50 MGy
Irradiation environment – LN2
Warm–up between the irradiation and certification tests:
mechanical/electrical test – short time only
thermal – yes, contact with atmospheric air should be limited
Certification tests temperature:
mechanical/electrical tests – 77K
thermal – 1.6 – 2.0 K

10. Beam energy required for the sample irradiation
Depth of bean penetration in water for various beam energy value
Scaling from water to G10
rH20 = g/cm3
rPMMA = 1.2 g/cm3
rG10 = g/cm3
For 2 cm long mechanical sample irradiation the beam energy as 10 – 11 MeV is necessary
Courtesy S. Wronka

11. Selection of the electron source available at NCBJ, Świerk, Poland
* For 0.5 mm thick sample

12. Insulation candidates
RAL mix 71 – DGEBA epoxy + D400 hardener
RAL mix 237 – Epoxy TGPAP-DETD(2002)
LARP insulation; CTD filler ceramic
Cyanate Ester AroCy L10 40% + DGEBA epoxy 60%

13. Electrical certification tests - standards
Test standard – EN : “Methods of test for electric strength of solid insulating materials. Tests at power frequencies”
Specimens dimension:
thickness – 0.5mm
length x width – min. 50x50 mmxmm
Required irradiation area – 5mm diameter circle (spot)
Photo – CTD, Inc.

14. Mechanical certification tests 1/2
Typical tests methods:
Determination of apparent interlaminar shear strength by short-beam method - EN ISO 14130
Specimens dimension requirements:
thickness – min. 2mm
length x width – min 20 x 6 mmxmm
Required irradiation area – full area of the specimen
Determination of mode I interlaminar fracture toughness - ISO EN standard
thickness – min. 5 mm
length x width – min 125 x 20 mmxmm
Photo – CTD, Inc.
Interlaminar shear strength test
Interlaminar fracture toughness test

15. Mechanical certification tests 2/2
Plastics - Determination of tensile properties - EN ISO 527-1
Specimens dimension requirements:
thickness – 0.5 mm is acceptable
(test part) length x width – 60x8 mmxmm
Required irradiation area – full area of the test part
Photo – CTD, Inc.

16. Thermal certification method
1.6 – 2.1K - Drum method:
allows determination of thermal conductivity and Kapitza resistance at superfluid helium conditions
Specimens dimension :
min. 3 different thicknesses from 0.1 – 0.5 mm range
length x with – 100x100 mmxmm
Required irradiation area – 80 mm diameter circle
4.2 – 300 K – standard thermal conductivity set-up based on cryocooler
Specimens dimension requirements: stripe of 0.5mm thick material
Required irradiation area – full area of stripe (preferably)

17. Irradiation set-up designed and commissioned at PWR and transferred to NCBJ, Swierk
Accelerator 0.2 mm thick Ti window
Irradiation cryostat operation tests
Irradiation set-up

18. View of partially irradiated thermal samples

19. Electrical certification test cryostat at PWR
Voltage source – up to 60kV

20. Electrical certification test cryostat at PWR

21. Radiation certification electrical tests summary
Criteria: 5 kV/mm !!!

22. Mech. tests commissioning
Burned
Normal

23. Courtesy, B. Baudouy, S. Pietrowicz

24. Courtesy, B. Baudouy, S. Pietrowicz

25. Courtesy, B. Baudouy, S. Pietrowicz

26. Courtesy, B. Baudouy, S. Pietrowicz

27. Courtesy, B. Baudouy, S. Pietrowicz

28. Courtesy, B. Baudouy, S. Pietrowicz

29. Courtesy, B. Baudouy, S. Pietrowicz

30. Courtesy, B. Baudouy, S. Pietrowicz

31. Courtesy, B. Baudouy, S. Pietrowicz

32. Courtesy, B. Baudouy, S. Pietrowicz

33. Thermal tests at PWr – set-up view

34. LARP and Mix71 thermal measurements in HeII results

35. LARP and Mix71 thermal measurements in HeII results

36. WP7.2 main achievements summary
Methodology for the high doses radiation certification of the future accelerator insulation materials
adaptation of industrial test accelerator to the functionality of high doses electron source
design, production and commissioning of cryogenic irradiation, mechanical test and electrical test set-ups
development of the irradiation procedure (know how):
dose rate
method of the material samples cooling during irradiation
material irradiation patterns
Implementation of the superfluid helium phase to the ANSYS CDF code and thermal modeling
Upgrade of the thermal conductivity and Kapitza resistance database with 3 new materials

37. WP7.2 the main outstanding problems/ the work to be done in the post-EuCARD era
Irradiation and mechanical test of 2 irradiated materials – to be done till June 2013
Irradiation and thermal test of 4 irradiated materials - to be done till Sep 2013

38. Task 7.2 - Milestones and deliverables status
Delivered/to be delivered
M27
M12
on time
M38
Milestone/deliverable
M7.2.1 Methodology for coil radiation resistance certification
M7.2.2 Preliminary heat deposition model for a dipole Nb3Sn model magnet
D Report on the radiation resistance, as measured with e- beams, of coil insulation materials for HL-LHC
D7.2.2 Thermal model for a dipole Nb3Sn model magnet
D7.2.3 Superfluid helium transport model for the thermal design of the high field model magnet
Expected
M24
M12
M48
M36

39. Team involved in the task WP7.2
PWR
Jarosław Poliński
Maciej Chorowski
Piotr Bogdan
Piotr Pyrka
Eliza Roszak
CEA Saclay
Francois Kircher
Francoise Rondeaux
Bertrand Baudouy
Slawomir Pietrowicz
STFC
Simon Canfer
CERN
Gijs dr Rijk
Rene Flukiger
Rob Van Weelderen
Attilio Milanese
Ezio Todesco
NCBJ Swierk
Slawomir Wronka
Micham Matusiak
Konrad Kosinski
TECHTRA
Piotr Bielowka