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Entry   optical table cleaning, posted by Ronic Chiche at Optical room about utilities Oxydation.jpg20241203_113105.jpg20241203_125359.jpg
    Reply   optical table cleaning, posted by Ronic Chiche at Optical room about utilities 
       Reply   optical table cleaning, posted by Ronic Chiche at Optical room about utilities 
Message ID: 229     Entry time: Fri Dec 6 16:59:57 2024     In reply to: 228     Reply to this: 231
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: utilities 
 Location: Optical room 
 Title: optical table cleaning 

this afternoon, we checked the dust meter which is at 0 for 1 and 5µm dust particles but ~ 2000-3000 for 0.3µm particles.

we opened the two top panels to let the air flow clean the inside of the vessel.

we observed some other minor oxydised regions (than the one taken in picture) on the external parts of the inox panels but at first sight, nothing inside the vessel.

Ronic Chiche wrote:

this morning with Alice and Daniele, we removed all the optics elements and equipments from the SBOX optical table and started to clean it.
the dust meter count 0 on all particle sizes after the cleaning.

we observed a small part of the SBOX which seems to be oxydised (see picture).

the two previously used mirrors of the SBOX (C23018/7 and C23017/2) were already in their plastic boxes outside of the SBOX.
they are still on the optical table.

we have to decide which mirrors to put in the cavity:

if we don't want to use a "new" ThomX coupling mirror M1, we have to use a Gamma-factory mirror (161185) with T=460ppm for example (we don't have any other FS plan mirrors).

if we don't plan to work at high power in the SBOX for the moment, we could use an "old" ThomX M2 mirror with ROC=2.241m (C1611/11) to avoid any risk of contamination of a "new" ThomX M2 mirror.

 

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