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This document provides updates on the measurements of MoGr blocks and the status of Mo and Cu coated blocks. It includes resistivity measurement results, non-irradiated preliminary measurements, and a summary of the findings.
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Updates on the Measurements of the MoGr Blocks Adnan Kurtulus, Nicolò Biancacci Acknowledgments: B.Salvant, C.Accettura, E.Métral, F.Carra, F.Caspers, I.Garcia, R.Fiastre, W.Vollenberg 1
Outline • Updates on the Measurements of the MoGr Blocks • Status of Mo coated DTI Batches. • Status of Cu coated Gr blocks • Non Irradiated Preliminary Measurements • Summary 2
Status of Mo coated DTI Batches. • The resistivity measurement results of Mo coated MoGr blocks are given below from DTI company. 3
Status of Cu coated Gr blocks • Performed measurements on an old CERN produced Cu coated Gr block. • 3 uncoated faces coated by DTI. • Resistivity values are consistent for 3 faces. (Theoritical resistivity for Cu= 17 nOhm.m)
Status of Cu coated Gr blocks Cu coating at DTI • Measurement done also on specific samples by C.Accettura at DC • Resistivity of Cu on Gr (R4450) • Good agreement with DC measurements. 5 https://indico.cern.ch/event/816840/contributions/3412132/attachments/1842475/3021740/20190510_4probesmethod.pdf
Non Irradiated Preliminary Measurements • There are small non irradiated samples (10 mm diameter, 1 mm height) to measure to understand ability of recovering the expected conductivities after irradiation. • We are trying to measure them with big cavity as setup shown below.
Non Irradiated Preliminary Measurements • Current distribution of two cases are shown from the simulation. • Current is distorted when sample is off centered. Sample is off centered Sample is on the center
Non Irradiated Preliminary Measurements Sample is off centered Sample is on the center Q values of simulation Q values of measurements
Summary and Outlook • Status of Mo coated DTI Batches. • The measurements of batch-9 has been made on July on DTI samples. • The results are inline with previous measurements. • Status of Cu coated Gr blocks • Resistivity values are consistent for 3 measured faces on DTI coated CERN blocks. • The results of H011 cavity and DC method are in good agreement. • Non Irradiated Preliminary Measurements: • Q values of CST simulation and measurements are on agreement. • Current is distorted on the edges • Outlook: • The resistivity measurements of new batches are expected to be measured in 2 weeks. • studies going on non irradiated samples. 9
Resistivity measurement results of Mo on Gr from Ricardo. 11