| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D021113.6 | NSA/AERI/C1 - AERI extended range detector at Barrow | nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| D030203.1 | NSA/AERI/C1 - Failure of AERI cryogenic cooler | nsaaeriC1.00, nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| D030203.2 | NSA/AERI/C1 - Failure of AERI cryogenic cooler | nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/18/2002 | 0132 | 05/16/2002 | 1830 |
| Subject: | NSA/AERI/C1 - AERI extended range detector at Barrow |
| DataStreams: | nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| Description: | The extended range detector had failed and a borrowed replacement detector was installed. The replacement detector had enough air present in the dewar to cause the cryogenic cooler to work at full current. The detector was still warmer than optimal and there is more noise present in the data than is considered normal. The data must be used with discretion. The system was shut off on 020516 due to noise and rising detector temperatures. |
| Measurements: | nsaaerich2C1.a1:
nsaaerisummaryC1.a1:
nsaaerich1C1.a1:
nsaaeriengineerC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/20/2003 | 1835 | 01/25/2003 | 0041 |
| Subject: | NSA/AERI/C1 - Failure of AERI cryogenic cooler |
| DataStreams: | nsaaeriC1.00, nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| Description: | Failure of the cryogenic cooler for the AERI detector resulted in the instrument being shut down during the interval January 20, 2003 @1835GMT until January 25, 2003 @0041GMT, when a new cryogenic cooler was installed. All data are missing for this period. Data after the new cooler was installed are within normal acceptable limits. |
| Measurements: | nsaaeriC1.00:
nsaaerich2C1.a1:
nsaaerisummaryC1.a1:
nsaaerich1C1.a1:
nsaaeriengineerC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/17/2003 | 1749 | 01/20/2003 | 1835 |
| Subject: | NSA/AERI/C1 - Failure of AERI cryogenic cooler |
| DataStreams: | nsaaerich1C1.a1, nsaaerich2C1.a1, nsaaerisummaryC1.a1, nsaaeriengineerC1.a1 |
| Description: | In January 2003, the cryogenic cooler current for the Barrow, AERI detector was steadily increasing. This increase is a sign of cooler failure. On January 16,2003, the cooler began to make noise. The cooler was shut-off on January 17,2003 and any condensed gases were allowed to vent. Condensed gases in the detector dewar cause a cooler to work harder and increase the current. The cooler was then resealed and turned on. However, the cooler did not recover and the current was at a maximum. The cooler was unable to completely cool the detector and the detector never achieved a temperature below 72K. Higher detector temperature increases instrument noise. The instrument was shut off on January 20, 2003 at 1835GMT to prevent a catatrophic failure due to complete cooler failure and repressurization of the detector dewar, which would result in a subsequent implosion of the dewar. |
| Measurements: | nsaaerich2C1.a1:
nsaaerisummaryC1.a1:
nsaaerich1C1.a1:
nsaaeriengineerC1.a1:
|