sPHENIX HCal discussion

[Edouard Kistenev <kistenev AT bnl.gov>]

Hi, John, 

I can't put it on agenda - not in the list of managers. Someone needs to do it for me.

Edward

PS. Comment to value engineering from last meeting.

Tapered tiles are already tested - they are in HCal lab and everyone have seen them. With small tiles - it is easy, with long tiles - a bit more sophisticated and time consuming but doable. What is important - tiles with reflective coating are not sensitive at all to minor damage to surface caused by machining (if 50mkm limited) - coating process takes care of it. Even more - machined tile if left untreated will be prone to crazing. Chemical treatment takes care of its longevity.

Flat iron plates are great idea. Unfortunately - they leave no space for scintillator at the inner radius of HOuter (or leave a lot of empty space in the structure) - I thought we gave it up.  

Let’s first finish with our existing prototype, it looks so elegant that any attempts to “improve” it today sound like heresy. After the run we may use “stretching” to take a break and one more look into the whole design.

Attachment: main.pdf
Description: Adobe PDF document