Dear Sultan,

 

just remark about thermal stress in diamond target. Indeed, diamond is pespective material for targets/detectors due to its highest thermal conductivity (it means reduced demands for external cooling).

There is just reference to the paper on the subject (not for hybrid positron source conditions, though). Probably, it could be of interest for Prof. Chehab. 

https://iopscience.iop.org/article/10.1088/1742-6596/732/1/012030
 

 

Best regards,

Anton.

 

 

Thank you so much for active participation in the work of our seminar!

I’m grateful for your comment with a link to rather interesting paper, that in cc now becomes available also to Robert (below, after my mail). 

Next days your note will be published also in the lecture’s minutes.

Dear Robert, you can reply to the comment either directly writing in the minutes or sending me your answer. Thanks again for your very attractive lecture!

With kind wishes,     Sultan

 

 

 

Dear Colleagues,
 

                           Thank you for this messge. I shall look trough the article of Anton and communicate later on. Thanks again , Sultan, for these nice meetings where it is the occasion to hear many colleagues already met at RREPS or Channeling symposia. 
 

                                                  With best regards
 

                                                 Robert

 

 

Dear Sultan, Dear Anton,
 

                                       I read the  interesting article of A.A.Babaev and A.S.Gogolev. The problematics are the same as in positron targets where the reliability is depending from the possible damages due to intense power deposition in small volumes of the target. In the attached note I tried to present an approach to this problem. I must underline that I found some discrepancies in the documentation concerning the diamond. As , for instance, for the tensile strengths. That is why this note is more qualitative than quantitative.
 

                                                                  With best regards
 

                                                                   Robert

 

 

 

Dear Robert,

 

thank you for your note.

Indeed, we calculated waves of deformation with COMSOL (that is like ANSYS) and published results in Russian-language journal in 2018 (I thought we published them in the paper I’ve sent….)

We found that the first bunch produced maximal von-Mises stress 2.2 GPa (that is close to your estimation; although I am not sure our approaches are completely the same), so we decided the target was broken.

 

Best regards,

Anton.