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Updates on Measurements of MoGr Blocks

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 Measurements of MoGr Blocks

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  1. 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

  2. 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

  3. Status of Mo coated DTI Batches. • The resistivity measurement results of Mo coated MoGr blocks are given below from DTI company. 3

  4. 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)

  5. 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

  6. 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.

  7. 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

  8. Non Irradiated Preliminary Measurements Sample is off centered Sample is on the center Q values of simulation Q values of measurements

  9. 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

  10. Thanks for your attention! 10

  11. Resistivity measurement results of Mo on Gr from Ricardo. 11

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