Chimney Open Issues Page: 2 of 3
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INTRODUCTION
In the process of developing a design for the design report, many
side questions or comments arose which were not completely
answered or investigated because the work was outside the scope of
developing a base design. I have pored over my meeting notes and
tried to list all such chimney "open issues" in this engineering note.
ISSUES
1. Is a 3" bending radius through the chimney acceptable? RRR fo aluminum
goes up as strain goes up. Will the copper separate from the aluminum
stabilizer at the bend?
Comment: Some investigation was done. A pure aluminum stabilizer can take a
bend radius of 1". A response from Akira said that based on experience a safe
bending radius should be 10 times larger than the thickness or width. My gut
feeling is that the bending of the conductor thru the chimney won't be a
problem.
2. I measured only 2 1/2" gap between the ECS and CC at the outer edge of the
vacuum vessels. This needs to be 3" for our chimney.
Comment: I've mentioned this to D-Zero people, Herme Stredde, Jim
Christenson.
3. What is the resonant frequiency of outr chimney? The silicon tracker
which mounts inside won't want vibration from fluid flow, vacuum pump.
4. It might be desireable to model the G-10 spiders with IDEAS to check the
heat load.
5. Is vibration a concern for the LN2 pipes as 20 fluid flows through them?
Comment (from R.L. Schmitt): "Vibration of the LN2 lines is probably only a
concern if velocity is very high."
6. Where and how will the vacuum jacket be supported by the outside world?
Comment: The obround section will be supported off the face of the CC. The
chimney section upward to the control dewar can be supported off the cryo
bridge.
7. Is the electrical noise from the turbomolecular pump O.K.?
Comment: The turbo pump is mounted outside the detector and should be
alright. Comment (from R.L. Schmitt): "A turbo pump is installed on the
bottom of the CDF control dewar. Detectors are within a few feet. The
experiment could tell you if there is a noise problem, but they have not
mentioned it to us."
8. G-10 supports for the chimney piping were not included in the 11/92
conductance calculations.
Comment: The conductance calculations will have to be revisited and redone if
quantitative numbers are going to appear in the design report.
9. Is it possible for leak diagnosis to tell if the leak is in the control dewar or
solenoid? (If a leak occurred.)
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Rucinski, R. Chimney Open Issues, report, October 4, 1993; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc843637/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.