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| ||||| Friday, March 08, 2002 - 08:02 pm How are you able to have the cryocooler pumps running and at some point not couple, vibration, with the HST. | |
| ||||| Friday, March 08, 2002 - 08:46 pm Answer: speak softly in a very high pitch. The compressor spins at about 7500 revs per second. At this very high speed natural filtering from the mass of the rest of the cryocooler will attenuate the vibration. In addition, the impeller spins on a cushion of air. This reduces the amount of vibration coupled to the rest of the mass. On top of all this, the overall cryo cooler is mounted on elastomeric cushions, further providing filtering. http://www.edcheung.com/job/sm3b/sm3b.htm | |
| ||||| Saturday, March 09, 2002 - 12:29 am Edward, Thanks for the quick response. I missed the speed in the information I had. At these speeds with a low mass rotor I see where the where is no problems. I use an air grinder that approaches this speed with a low mass rotating element, that has no problem with vibration. Thanks again, syd | |
| ||||| Sunday, March 10, 2002 - 03:15 pm When will you know if the cryo cooler is operating properly? When/how soon will you know that the cooler will achieve the temperatures that will enable NICMOS to function again? I'm really happy for all of you! So glad 3B went so well, and looking forward to seeing new images from HST. | |
| ||||| Sunday, March 10, 2002 - 04:21 pm Hmm, good question seeing that this board stops operation March 15. It may be difficult for you to find out the details. I expect to be present when the NCS is started up. If all else fails, and you have no other information outlet, E-mail me in a few weeks at: echeungNOSPAM@hst.nasa.gov (remove the caps). http://www.edcheung.com/job/sm3b/sm3b.htm | |
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