Tohban Report 2015-04-08
From RHESSI Wiki
| Tohban Reports | |
|---|---|
| Start Date: | 01 April 2015 |
| End Date: | 08 April 2015 |
| Tohban: | Lindsay Glesener |
| Tohban email: | glesener@ssl.berkeley.edu |
| Next Tohban: | ??? |
| List all reports | |
Contents |
Solar Activity
Memory Management
Spacecraft Status
Data Gaps
Temperatures
Cryocooler power: It was determined that the cryocooler experiment performed the previous week (i.e. turning up the power to 75W) had not caused a significant enough change in the cold tip temperature (only 0.6 degree total) and was causing some potential for damaging problems, including damaging the cryocooler (though note we don't think any damage was caused by this test), running too low on the battery voltage (due to the increased power usage), and additional noise on the spacecraft bus that may have caused an ATS load not to take. It was noted that what we are seeing from the cryocooler, i.e. decreased return (cooling) on the investment (power) is indicative of approaching the regime where we're almost out of room for the cryocooler piston to move without hitting the stop. In light of these risk factors, and the fact that we didn't gain much in terms of temperatures, it was decided to return the cryocooler power to 71W.
That change was made April 1 (no joke!) at 21:59 UTC.
Detector issues
Other notes
Spacecraft Management
A spinup was performed on April 1. RHESSI was spun up from 14.6 to 15.0 RPM today between 2015-18:52 and 20:22 UTC.
| Decimation | Active/Vigorous |
| Night time data (fronts) | plus/minus 4 min |
| Night time data (rears) | plus/minus 4 min |
| Require extra passes? | No |
| Requirement for moving pointer? | No |
| Attenuator operation | Normal |
