Seventeenth design meeting

Friday 31 Jul 2020, 14:00 → 15:00 Europe/Zurich

Changes in the design

• Temperature sensor on top and bottom cap of the sample holder.

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• Temperature sensor on the helium capillary under Lambda plate

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• Changed helium capillary routing for ease of installation

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• 2 HS50 heaters on bottom plate of the psep

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• Flexible outgoing helium line bellow PSep

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• Capillary going inside vacuum chamber down, and exit on the bottom of the chamber

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Discussion:
 

• “chain like” KF flange in cold volume instead of the normal flange, because of cryo temperature
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• Bottom flange is custom (nonstandard) to accommodate exact size
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• Smaller diameter of the line of level gauge would possibly be better from thermal acoustic oscillation point of view (28 mm diameter now)
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• I checked thermal conduction through the pipe enclosing the bayonet line, to see if freezing of water on the top flange will be significant or not, the power going through is in the range of 3 W with the geometry implemented today

14:00 → 15:00 Discussion

Kryolize_Report_Fresca 1 insert with 2.9 barg.pdf

From: Torsten Koettig <torsten.koettig@cern.ch>
Sent: 04 August 2020 14:40
To: Luca Dassa <Luca.Dassa@cern.ch>
Cc: Laetitia Dufay-Chanat <laetitia.dufay-chanat@cern.ch>
Subject: RE: insert for impedance tests

 

Hi Luca,

 

Here is my draft calculation for the SV pipe diameter.

Please have a look and check with your calculations.

 

Pipe length is 50mm inside and 100 mm outside the vacuum vessel. All for the new pressure of 2.9 barg.  20 layers MLi on the phase separator and the flexible in the line at the cold part. 10 layer of MLI along that pipe.

 

 

I need to catch a tram at 12.15 from CERN to leave for vacation, so I need to go at least 11.45 around.

 

 

Yours Torsten