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Meeting CERN-Nanoker
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Europe/Zurich
F. Carra showed that the objectives defined at the beginning of the project were achieved.
S. Hoell presented the results of tests performed at Cern to see if the annealing process is necessary for CrGr. From sequential annealing at increasing temperature levels an elongation of the samples during annealing steps at 1300°C and 1400°C was obtained, probably due to a phase change. Industrial applications (<400°C) and collimation (<1000°C) do not require any annealing, as no significant length changes could be detected in this temperature range. CTE to be better evaluated, values obtained so far comply with the functional specification (<15e-6 K^-1).
Test were performed on trough-plane specimen; in-plane measurements are ongoing.
Actions:
- Test a 3rd out of plane sample at 400 and 1000C to increase statistics à Stefan
- Test 3 in plane samples with the 400C and 1000 cycles à Stefan
- Prepare a list of samples to be cut by Nanoker for a complete thermostructural characterization. For each family of samples, indicate: scope of the samples (which physical quantity is measured), number, dimensions, direction (in plane our out of plane). Add any other wanted specification (more samples of the plate radius? Which plate out of the two shown in slide 11 of Fede’s presentation? Etc.). Keep in mind measurements as a function of temperature, and pre/post thermal cycles (25-1000C for example?) àStefan with Jorge
- Inform CERN with some advance when a slot for possible sintering cycle is available in the SPS machine, to discuss together which sintering test we could do à Sergio, Carlos
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