====== Engineering Meeting Oct 07, 2024 ======

Time: 8am PT/11am ET/5pm CET
Zoom link: https://uzh.zoom.us/j/5166204490?pwd=VUt1VmFLVmJsYTExeXJka0JwbUlIQT09


Attendance: Matt, Dan M, Andrey, Alex, Kamil, Emma, Iva, BP, Scott


Agenda:
  * Vibration specification - Matt [[https://docs.google.com/presentation/d/1QZVWxn7JXC5zd69pPfBtt9XVqhUB6bJbxqPOQOnfgEQ/edit#slide=id.g276ef76903e_0_89|slides]]
    * Need to suppress all peaks 75-110 Hz to 10^-6-10^-7 PSD g/sqrt(Hz) 



  * Fridge Internal Weights - Emma[[https://docs.google.com/spreadsheets/d/1A7ndfzWARWyeTKXfDh8Agbhp-VS1iaWfDKWxS_03I-A/edit?usp=sharing|Spreadsheet]]
    * Bluefors LD 400 conclusions are: the weights are too heavy
  * Updated simulations and radiopurity requirements - Alex
    * Updated background activity from Edelweiss, SuperCDMS etc 
    * Updating in particular Ti double the background about 
    * Underground copper or ancient lead is our only way to improve

Other points:

  * Andrey - Design studies for a circular/chamfered design
    * 30% of weight savings
    * Simplified the pieces, might be easier to machine
    * Made design of individual pieces easier to manufacture
    * Screenshots: [[https://drive.google.com/drive/folders/1g1doxwZ6cujvktOinU10wnV-EWGRsD5N]]
  

To Do:
  * Approximate design of vibration decoupler
  * Andrey will detail new drawings of 'otcagon design' and sends them to UZH
  * Alex adding ancient lead only sims and discussing with Julien


We should also discuss talk information Julien needs for Oxford Instruments