Tohban Report 2012-01-25

Tohban Reports
Start Date:	18 Jan 2012
End Date:	25 Jan 2012
Tohban:	Claire Raftery
Tohban email:	claire@ssl.berkeley.edu
Next Tohban:	Hugh Hudson
List all reports

Solar Activity

• RHESSI IS ANNEALING THIS WEEK

Solar activity was higher than we'd hoped this week, given that RHESSI is undergoing its third anneal. Along with 19 C class flares, there was also three M class flares, including the biggest particle event since October 2003 on Jan 23 2012. Of course, RHESSI did not catch any of these as it is annealing. Activity doesn't look like it will be slowing this week.

How many GOES flares occurred?

Flares above B, C, M, X class were      ?    19     3     0

And how many of these are listed in the RHESSI flare list?

Flares above B, C, M, X class were      0    0     0     0

And how many had EXCELLENT coverage?

Flares above B, C, M, X class were      0     0     0     0

There were RHESSI flares/GOES flares 0 / 0 over the time range 18-Jan-12 25-Jan-12

Memory

We are not taking events and are keeping up with the extra ADP data being generated, with the SSR reaching 0% on the final passes.

There was a read error on Friday night during the acquisition of ADP data. This was reset and is behaving normally now.

Data Gaps

Annealing

Detector issues

Annealing

Annealing plans

Following the Over Current Trip (at 2012-017-06:32:36 UTC) shutting down the cryocooler, an investigation and brainstorm led to the conclusion that there was in fact, no over current issues with the cryocooler and it was deemed safe to turn on. This was successfully done on 2012/019 02:29:17 UT with the OC trip turned off. It was decided to leave the OC trips off for the remainder of the anneal as 1. They have been off since the last cryocooler anomoly in March 2010 and 2. The detectors have been annealed before with the OC trips turned off. Following the turning on of the cryocooler, the heaters were incrementally turned on to a set point of 50 C followed by 94 C over the next two days. We are now in full anneal mode, with the temperatures holding steady.

Latest numbers as of final pass on 25 Jan 2012

Cryo Power: 21.9 W avg accel: 11.8 mG Cold Plate 1: 372.5 K Cold Plate 2: 369.1 K Cold Tip 1: 271.8 K Cold Tip 2: 268.8 K Thermal Shield: 329.9 K

Cooldown plans

Cooldown will begin on Monday 1/30 with the first pass around 1900UT. During this pass, the heaters will be turned off and the detectors will be allowed to cool slowly until a temperature of 190K is reached.