Tohban Report 2015-12-16

From RHESSI Wiki

(Difference between revisions)
Jump to: navigation, search
 
(2 intermediate revisions not shown)
Line 46: Line 46:
===D1===
===D1===
-
Early the week, we observed enhanced fast rates (and reduced livetime) in the rear segment of D1 and D7. Because rear-fast threshold is already 0xFF, we tried lowering HV. No obvious change in the monitor rates.
+
Early the week, we observed enhanced fast rates (and reduced livetime) in the rear segment of D1 and D7. Because rear-fast threshold is already 0xFF, we tried lowering HV. This helped D7, but there was no obvious change in the D1 monitor rates.
   
   
   Dec 14, 18:19, lowered HV from 3600 to 3400 V.
   Dec 14, 18:19, lowered HV from 3600 to 3400 V.
Line 63: Line 63:
===D4===
===D4===
-
HV was lowered in an attempt to reduce slow rates. The slow rates did decrease a little, but, when the events were turned on for a few minutes, the rate of write pointer motion increased significantly.  
+
HV was lowered in an attempt to reduce slow rates. The slow rates did decrease, but, when the events were turned on for a few minutes, the rate of write pointer motion increased significantly.  
  Dec 10, 21:38, lowered HV from 1500 V to 1000 V
  Dec 10, 21:38, lowered HV from 1500 V to 1000 V
Line 81: Line 81:
===D7===
===D7===
-
D7 front slow threshold was lowered to 0x10 but was brought back to 0x10 due to significant increase of slow rates. D7 HV was lowered in attempt to reduce D7 rear fast rates (and to recover the livetime of the rear segment)
+
D7 front slow threshold was lowered to 0x10 but was brought back to 0x20 due to a significant increase of slow rates. D7 HV was lowered in attempt to reduce D7 rear fast rates (and to recover the livetime of the rear segment).
  Dec 10, 21:38, lowered front slow threshold from 0x20 to 0x10
  Dec 10, 21:38, lowered front slow threshold from 0x20 to 0x10

Latest revision as of 08:34, 16 December 2015


Tohban Reports
Start Date: 9 Dec 2015
End Date: 16 Dec 2015
Tohban: Mitsuo Oka
Tohban email: moka@ssl.berkeley.edu
Next Tohban: TBD
List all reports



Contents

Solar Activity

Solar activity was low (at B-class level) through out the week although there were some C-class activities during the weekend. There are 9 ARs on disk. 4 ARs are expected to be rotated off the disk within 1 or 2 days.

How many GOES flares occurred?

 Flares above B, C, M, X class were      6     1     0     0

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

 Flares above B, C, M, X class were      2     1     0     0

And how many had EXCELLENT coverage?

 Flares above B, C, M, X class were      2     0     0     0

There were RHESSI flares/GOES flares 183 / 7 over the time range 07-Dec-15 14-Dec-15

Memory Management

Decimation was active/vigorous for the full time period. Both front and rear detectors are off during SC night, except for 4 minutes on either side. The SSR is not emptying out.

Spacecraft Status

The cold plates, 1 and 2 were at 132.5 and 131.1 K, on 2015-12-15.

Data Gaps

No significantly large data gap.

GAPS IN APP_ID = 1 (VC1-SOH) WITH PACKET RATE LT 30

2015-12-11T19:35:00.000 -- 2015-12-11T19:50:00.000       900.00000

GAPS IN APP_ID = 154 (VC1-PMTRAS) WITH PACKET RATE LT 4

2015-12-11T19:40:00.000 -- 2015-12-11T19:50:00.000       600.00000


Detector Issues

D1

Early the week, we observed enhanced fast rates (and reduced livetime) in the rear segment of D1 and D7. Because rear-fast threshold is already 0xFF, we tried lowering HV. This helped D7, but there was no obvious change in the D1 monitor rates.

 Dec 14, 18:19, lowered HV from 3600 to 3400 V.

D2

Dec 09, 23:42, raised front fast threshold from 0x70 to 0xFF
Dec 14, 18:19, lowered HV from 4100 to 3900 V

D3

No improvement after power-cycling (The plan was to lower front slow threshold from 0xC0 to 0xB0 if the power-cycling could successfully reduce noise).

Dec 10, 16:42-18:19, power-cycling

D4

HV was lowered in an attempt to reduce slow rates. The slow rates did decrease, but, when the events were turned on for a few minutes, the rate of write pointer motion increased significantly.

Dec 10, 21:38, lowered HV from 1500 V to 1000 V
Dec 12, 00:33, events turned on for 3.5 min

D5

No change made

D6

D6 front slow threshold was lowered without significant increase of slow rates.

Dec 10, 19:58, lowered front slow threshold from 0x40 to 0x30
Dec 12, 00:30, lowered front slow threshold from 0x30 to 0x20

D7

D7 front slow threshold was lowered to 0x10 but was brought back to 0x20 due to a significant increase of slow rates. D7 HV was lowered in attempt to reduce D7 rear fast rates (and to recover the livetime of the rear segment).

Dec 10, 21:38, lowered front slow threshold from 0x20 to 0x10
Dec 12, 00:33, lowered HV from 3500 to 3300 V
Dec 12, 19:20, raised front slow threshold from 0x10 to 0x20 

D8

No change made

D9

D9 is off

Other notes

Spacecraft Management

Decimation Active/Vigorous
HLAT Decimation Rear decimation weight 6, no front decimation
Night time data (fronts) +/- 4 minutes
Night time data (rears) +/- 4 minutes
Require extra passes? No
Requirement for moving pointer? No
Attenuator operation Working as expected
Detector problems? See notes above.
Personal tools
Namespaces
Variants
Actions
Navigation
Toolbox