Progress survey on work on radiation damage of materials used in FAIR-facilities and further experiments suggested W. Ensinger TU Darmstadt FB Materialwissenschaft Stipendiats/PhD students: Vincent Lima, Anton Belousov

Radiation damage of materials used in FAIR-facilities Project/Stipendiat Vincent Lima Damage of polymer-based materials by stray radiation (secondary radiation by beam loss) Radiation hardness and life-time investigations of components of magnets and other beam-guiding elements (insulation of superconductor cables, structural parts of magnets) made of polymers and composites Irradiation experiments and investigation of relevant material properties, such as electrical insulation and mechanical strength V. Lima et al., Degradation of polyethylene oxides during irradiation with uranium ions, GSI Scientific Report 2010, 389 V. Lima et al., Mechanical Strength Tests on Ion Irradiated Glass Fibre Reinforced Epoxies, GSI Scientific Report 2011

 superconducting (sc) magnets  more compact design  closer to the beamline Radiation damage of materials used in FAIR-facilities

radiation sensitive materials polymers fiber reinforced plastics (FRP) SIS 100 Dipole „G11“ (green) Kapton TM (brown) 4

Protons, 21 MeV, 2E16 p/cm 2, 82 MGy Ni, 11 MeV/u. 5E12 ions/cm 2, 25 MGyTa, 11 MeV/u. 5E12 ions/cm 2, 80MGy „Cocktail beam“ ~6MGy 5

Tensile strength test results of irradiated coil parts of dipole-magnets made of glass-fiber reinforced polyepoxide (GSI Scientific Report 2011) Radiation damage of materials used in FAIR-facilities

Limit by European law 7 Radiation damage of materials used in FAIR-facilities

8 proton (21 MeV) irradiated G11 (ITEP Moscow) pristine 2× × × × × × ×10 16 Epoxy matrix less irradiation resistant than polyimide (weakest part of magnet) p/cm 2 Pb ions (2.3 GeV) irradiated G11 (UNILAC Darmstadt) 1× × × ×10 12 ions/cm 2 Radiation damage of materials used in FAIR-facilities

Ü bersicht FAIR relevanter T ä tigkeiten des Arbeitskreises Materialanalytik, Fachbereich Materialwissenschaften, Prof. Dr. Ensinger, TU Darmstadt 9 „Voltage Breaker“ The Insulated Helium Connector: - Helium transportation (from one coil to the yoke cooling channel) -stops the current - 20 Bar of pressure -Fiber reinforced plastic for SIS100 (produced by Babcock Noel) Radiation damage of materials used in FAIR-facilities

Ü bersicht FAIR relevanter T ä tigkeiten des Arbeitskreises Materialanalytik, Fachbereich Materialwissenschaften, Prof. Dr. Ensinger, TU Darmstadt Direct irradiation with Ar-Ions (400MeV/u) up to 0.9*10 14 ions/cm 2 (8.9 MGy) „Voltage Breaker“ Test After one thermal cycle to 77K the leakage rate of the voltage breaker increases from 1e-11 mbar*l/s to 5e-5 mbar*l/s (at a helium pressure of 25 Bar) 9 MGy of Ar beam is too much for the voltage breaker: Shielding will be required! 10 Radiation damage of materials used in FAIR-facilities

Before the shield installationAfter the shield installation Beam Shield: 6 mm of stainless steel Voltage breaker 11 Design recommendation

 A. Belusov et al., SEUs in CCD chips in radiation environment of high-intensity heavy ion accelerators, Document ID: ACC_FAIR-note , GDS-ID: DOC-2012-Mar-6 Project/Stipendiat Anton Belousov Damage of semiconductor components by stray irradiation Radiation hardness and lifetime investigations of electronic components, particularly for beam diagnostics (CCD-cameras) Irradiation experiments and tests of functionality of cameras (CCD-chips, electronics) Radiation damage of materials used in FAIR-facilities

A. Belousov et al., Short and Long Term Ionizing Radiation Effects on Charge-Coupled Devices (CCD) in Radiation Environment of High-Intensity Heavy Ion Accelerators, 14th International Workshop on Radiation Imaging Detectors 2012 Pixel events of a CCD-camera chip induced by secondary radiation of a target. Radiation damage of materials used in FAIR-facilities

 Summary Experiments on radiation damage of radiation-sensitive materials (in the vicinty of the beam-line) give insights on the failure mechanisms. Further experiments aim towards the identification of materials weaknesses, life-time estimations and possible steps to increase service life (e.g. by radiation shielding). Radiation damage of materials used in FAIR-facilities

 Further investigations required:  Electronic materials and devices (beam guiding elements, cameras)  Scintillator materials (beam diagnostics)  Magnetic materials (TiNb alloy superconducting magnets)  1 PhD student ( ) Radiation damage of materials used in FAIR-facilities