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IntroductionR2E/EPC Projects will be based on Commercial Off The Shelves - COTS components. Ensuring a given hardness to a design and production based on this component category (not designed for) requires a strong strategy. R2E Validation LevelsA given machine failure rate leads to following figures driven by the quantities of units being in operation. For example, an IGBT transistor with a cross section of 1E-11 cm², used 4 times in 100 converters will lead to 4 LHC Machine failures / year at a E>20MeV fluence of 1E9 part./(cm².year), for this component only. Testing component in a mixed field like CNRAD gives the opportunity to validate the SEE and the TID criteria, but SEE sensitivity can be under-estimated due to facility low energy spectrum.
Component Validation Levels
* 100Gy is very high compared to non-tunnel installed units, but it is a bit low for tunnel installed units: in such a case, a dose spread over the full unit family installed is obtained moving / replacing units from low dose <=> high dose locations in the full LHC machine life. COTS ManagementCOTS components sensitivity is given by the original component design (inherent structure at the semiconductor level), but also by the foundry being used for production, and then is very hard to keep under control. A component being tested some years ago doesn't give a lot of information on the today component behaviour, since perhaps produced differently: new design or process or even in another foundry. A Quality Plan has then to be strictly followed to minimize the risk. R2E COTS CERN Validation Process .vsd COTS IdentificationCOTS Identification is the process which determines if a given COTS is sharing the same BATCH than another one. COTS TraceabilityCOTS traceability is certainly a must, even if perhaps not mandatory in our cases. R2E Component Single Event ValidationAll components are not showing the same sensitivity to radiations, and especially to the single event effect: theoritically and practically. Based on the litterature and the domain knowledge, 3 classes will be used to classify the components, with testing effort in relation to the known criticity. S.E. Classes Definition
Component Classification Criteria Table
S.E. Test ProcessR2E S.E. COTS CERN Validation Process .vsd R2E Component T.I.D ValidationTID Classes Definition
Component Classification Criteria Table T.I.D. Test ProcessR2E T.I.D. COTS CERN Validation Process .vsd R2E Component Displacement Damage Validation |
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