0000373: The cryo-temperature of RT8/MFFE-06 became high since UT06:00,25/08 for unknown reason.
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ID Category Severity Reproducibility Date Submitted Last Update
0000373 [MFFE] cooling/cryostat major always 25-08-11 09:59 19-09-11 09:43
Reporter Yuan Tang View Status public  
Assigned To Harm-Jan Stiepel
Priority normal Resolution fixed  
Status resolved  
Summary 0000373: The cryo-temperature of RT8/MFFE-06 became high since UT06:00,25/08 for unknown reason.
Description The cryo-temperature of RT8/MFFE-06 became high since UT06:00,25/08 for unknown
reason.(The pressure of the helium is ok from Peter G.)
Additional Information Note:

Cryo temperature fortunately settled below 20K after a couple of hours on 25.08.
I added the daily plot of this incident to this issue for documentation.

I already recognized an unstable cryo temperature of RT-8 for at least two weeks. No variation in He-pressure. 70K plateau temperature decreased from
approx 77K to 65K.

But temperature of 20K plateau remained always below 20 K. I haven't seen
rising it that dramatically. Jan Stolt is on holiday and I wanted to keep
the spare MFFEs for urgend issues. That's why I left it as is so far.

Same for RT-D by the way.

(Juergen 20110826)
MFFE 06
RT 8
MFFE-band all bands
polarisation X, Y
sky frequency (MHz)
Attached Files  cryo20plot-20110826100307.jpg [^] (109,350 bytes) 26-08-11 10:08

- Relationships

- Notes
(0000359)
Harm-Jan Stiepel
19-09-11 09:42

 Op 5 sept. 2011 is MFFE06 vervangen door MFFE09
 

- Issue History
Date Modified Username Field Change
25-08-11 09:59 Yuan Tang New Issue
25-08-11 09:59 Yuan Tang MFFE  => 06
25-08-11 09:59 Yuan Tang RT  => 8
25-08-11 09:59 Yuan Tang MFFE-band  => all bands
25-08-11 09:59 Yuan Tang polarisation  => X, Y
25-08-11 10:49 Yuan Tang Assigned To  => Juergen Morawietz
25-08-11 10:49 Yuan Tang Status new => assigned
26-08-11 10:08 Juergen Morawietz Additional Information Updated
26-08-11 10:08 Juergen Morawietz File Added: cryo20plot-20110826100307.jpg
26-08-11 10:19 Juergen Morawietz Additional Information Updated
26-08-11 11:22 Juergen Morawietz Additional Information Updated
30-08-11 13:46 Juergen Morawietz Assigned To Juergen Morawietz => Harm-Jan Stiepel
19-09-11 09:42 Harm-Jan Stiepel Note Added: 0000359
19-09-11 09:43 Harm-Jan Stiepel Status assigned => resolved
19-09-11 09:43 Harm-Jan Stiepel Resolution open => fixed