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Cluster EFW Operations

These pages are intended to store and spread information on EFW operations, particularly within the EFW community. It is not expected that all information will be digestible to the uninitiated user, though there has actually been some pedagogical improvement with time, and you may hope for more.

The pages are now in the public domain, though access to some files of specialized content and limited interest, notably emails from outside partners, require username and password.

Please suggest improvements and report errors to Anders Eriksson.

Introduction -- EFW in general
WEC operations
ESOC mission operations reports (restricted access)
Command log files
Commissioning
Calibrations -- files and tech reports
Standard operations

Brief EFW status info
ASPOC operations
EFW internal burst operations

Standard operations -- how we usually run
Sweep operations
Accessing detailed information

Non-standard operations -- anomalies and special operations
Resources and links

Introduction

To understand this page, some knowledge of the EFW instrument is needed. Part of that knowledge can be gained from:

EFW operations presentation at EFW team meeting 050207. Covers how EFW operations are planned, how we usually operate, and what degrees of freedom we have.
EFW paper in Space Science Reviews (Gustafsson et al., SSR vol. 79, p. 137-156, 1997). Details on EFW as designed for Cluster I.
Paper on E-field measurements by Pedersen, Mozer and Gustafsson (Pedersen et al., in Measurement Techniques in Space Plasmas: Fields, AGU monograph 103, 1-12, 1998). Background on double-probe technique, including some details of EFW as re-designed for Cluster II.
EFW for dummies. Introduction to EFW and the double-probe data by Chris Cully.

WEC operations

The Wave Experiment Consortium operations are coordinated by the DWP team in Sheffield, who does a great job keeping us afloat. Many thanks to the Sheffield team!

WEC operations page (access restricted to WEC ops group members).

Command log files

Command logs are available here (restrictd access). These logs are excerpts from the complete command history files provided by ESOC, made by grepping the string WEC. They thus include all WEC commands, which of course includes all EFW commands. The list is updated irregularly, perhaps once a month or so.

Commissioning

The commissioning is summarized on the WEC commissioning page.

Calibrations

Digital calibrations

Digital calibration report. EFW-UIO-TN-0202 by Bjørn Lybekk.

Digital calibration files. The EFW digital end-to-end calibrations are summarized in the EFW calibration files in the WEC cal server in Toulouse. These files try to characterize each individual channel on each of the spacecraft for different amplitudes, but much of the variations seen are suspected to be incidental rather than real. In particular, the ADC offsets will vary in time, and the tabulated values are thus of little use. For detailed analysis, use the analog cal files instead. The most recent files are given here:

Analog calibrations

Analog calibration report: The Cluster EFW Filter Calibration Report by Gabriella Stenberg summarizes the analog calibrations.
Analog calibration files: The essence of the analog calibrations is distilled into a few files of frequency response tables. The columns in each file are: frequency, response in dB, phase response, and real and complex part of transfer function.

Filter inversion: Anders Tjulin has made a nice example plot of inverting the frequency response of the V12H filter and comparing to V12L. The blue line is V12H data calibrated in the frequency domain using the VxyH cal file above. Stars are simultaneous V12L samples.

Standard operations

The list below covers the standard setup of EFW, used during regular operations. Most of this standard setup is defined by what is known as "henceforth parameters", so the changes in standard setup are mostly the results of changes of the henceforth parameter database at JSOC/ESOC.

For reasons of special operations or anomalies (listed below), this setup may not always be the one used.
Also, at the start of each acquisition interval, there may be some minutes before the instrument is properly setup

Brief EFW status info

Per-Arne Lindqvist puts up some brief status information day-by-day on web pages for SC1,SC2,SC3,SC4, and all SC. The format of this information is described by Per-Arne as follows:

There is approximately one line per 24-hour period, with information taken
from the last complete DSC of that day. The information includes:
Flight software version number
    (21 is the nominal version, 25 is when SDT is running (I think), and
    22 is the version when modified spin fits are made)
Number of resets of the EFW instrument
    This should ideally increment by one each time EFW is reset, but it
    appears to resume from some other value occasionally
Time elapsed since last EFW reset
Bias, Puck and Guard settings
Spin period

This information will be updated automatically once per day with the
most recent data retrieved from CDDS at ESOC for the previous day.

ASPOC operations

The plans for ASPOC and EDI operations are accessible at the PEACE web site.

EFW internal burst operations

EFW has an iternal burst memory of 1 MB size, which we can fill with data sampled at up to 36 kS/s.

Technical possibilities. See the EFW ops presentation or the Gustafsson et al SSR paper.
Dumping the burst data. The Master Science Plan (MSP) allocates telemetry mode BM3 normally twice per orbit, allowing us to dump our internal burst memory. On each s/c, we thus normally have two bursts per orbit, i.e. six bursts per week.
List of already collected bursts. The list is updated at irregular intervals, perhaps once a month or so. The columns in this list are:
    Isdat file name -- a rough (plus minus 30 s) indication of burst time
    fs: Sampling frequency
     q: Number of quantities sampled
    ss: Search pages
    cc: Collect pages
    Quantities: What actually was sampled.
Trigging the bursts

The EFW bursts can be trigged on a variety of signals (see Gustafsson et al SSR paper or the EFW ops presentation).

V12M seems to be a useful signal -- if something happens here, data are probably fun.
On SC13, P1 is broken, so V12M is not very useful. We normally use BP34 instead.

The EFW burst trigger is normally enabled for some period, usually between 30 mins and a few hours twice per orbit. Longer period means larger probability of spurious trigs on e.g. WHISPER transmissions, shorter time less likelihood of hitting something fun.

Planning burst operations. Burst operations are ususally planned as follows:

Ensure that there are no wasted BM3 opportunities. If there is a BM3 dump, there should be an EFW burst collected before it.
If there are any spacecraft burst mode (BM1) operations on an orbit, we usually enable the EFW burst trig within this period. This should increase the probability of getting high-resolution data from other instruments when we have our internal burst data.
Look at what EFW users have requested.
Try to co-ordinate EFW burst ops with WBD (Wide Band Data) operations. For coordinated EFW-WBD operations from November 2008, see here.
If none of 2-4 above apply, a region that looks fun is chosen for the burst, often using a default configuration (which is given in the table below).

Requests for burst operations. Please suggest how you think we should use the burst. Send a mail to Anders and Mats, telling what you think we should do, and why. The following requests are known for the moment:

Request	Region	Relevant time period	Requested by whom?	Tech details	Comments
Bow shock and solar wind unfiltered bursts	Bow shock/solar wind	Dayside apogee period 2004-2005	Forrest Mozer	Sampled: 4 x 9 kS/s, V1U, V2U, V3U, V4U (SC24); V2U, V3U, V4U, V3H (SC13) Trig on: V12M (SC24), BP34 (SC13)
Lower hybrid cavities	Inner magnetosphere (between perigee and auroral zone)	All	Anders Eriksson, Anders Tjulin	Sampled: 4 x 9 kS/s (V1V2V3V4H) or 8 x 4.5 kS/s (V1V2V3V4H, Bx, By, Bz) or 8 x 450 S/s (same but M instead of H). Trig on: V12M (SC24), BP34 (SC13), or time tagged in interesting region.	Need to cover all MLTs and all ILAT < 75 deg, so better have one burst per week over long time than many in a short period.
WBD comparisons	Anywhere WBD is operating	All	Anders Eriksson	Sampled: 4 x 9 kS/s (V1V2V3V4H) or 2 x 18 kS/s (V12V34H) Trig on: V12M (SC24), BP34 (SC13)	Now and then. If other bursts are colocated with WBD, this request needs not be treated.

Sweep operations

Probe bias sweep (current and voltage) are used for providing diagnostics of the probes and of the probe-plasma coupling as well as for getting information on the plasma parameters. We usually run at least one sweep every AI, though sweeps may be cancelled altogether during short AIs. Since August 2001, we have a strict time-sharing between sweep and burst operations, in order to ensure that sweeps do not trigger bursts. An example current sweep is available here. The photoelectron saturation current has stayed around 260 nA since end of commissioning, with a typical sheath impedance at the standard operational point (-140 nA current bias) of 12 Mohm.

Accessing detailed information

To see the detailed setup at some particular time, an ISDAT user may choose the ctm menu clients->cluster->efwstat. This will present you with an overview of the instrument setup at the start time of the interval you have selected in the time manager (ctm). What you immediately see is some brief status information with 1 second resolution (the FDM, or Fast Digital Monitor). In efwstat, choose view->DSC to see the more comprehensive status information in the Digital SubCom telemetry. Not all elements in this 256-item list are self-explanatory (for example, only expert users will understand the burst status quantities), but some should be evident and useful (i.e. bias current and sweep settings). Note that 8 entries of the DSC are updated every second, so that any single item is updated every 32 seconds.

Standard operations

These are the default settings, defined by the JSOC henceforth parameters. Note that we quite often run individual bursts with different settings than those shown, and (during autmn 2002) quite often used Langmuir mode on SC13 P2. Significant deviations from the standard settings below are reflected in the table of non-standard operations (though this table usually does not show all burst parameters and SC13 P2 Langmuir mode).

Valid from YYYY-MM-DD HH:MM	Change	Settings	Comments
2001-02-01	Initial operational setup	All probes in E-field mode (current bias) -180 nA on P12, -220 nA on P34 Puck -1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins	Start of nominal operations
2001-03-07 15:38	Bias voltage sweeps extended from 64 to 96 steps	All probes in E-field mode (current bias) -180 nA on P12, -220 nA on P34 Puck -1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins	To span most of available +-40 V range
2001-04-25	-180 nA on all probes	All probes in E-field mode (current bias) -180 nA on all probes Puck -1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins	To symmetrize probes and decrease saturation problem in dense plasmas
2001-05-25 01:34	Puck to +1 V on SC1 and SC3	All probes in E-field mode (current bias) -180 nA on all probes SC1, SC3: Puck +1 V, guard -6.1 V SC2, SC4: Puck -1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins	To check if this cures glitches on anti-sunward probe.
2001-06-01 04:54	Puck to +1 V on all s/c Bias current to -140 nA	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins	Bias current change to stop saturation in dense plasmas. Puck voltage put equal on all s/c after testing since May 25 on SC1 and SC3.
2001-06-30 01:37	Burst initial threshold to 0	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins Burst: V12H and V34H at 18 kS/s Trig on BP12	From this on, EFW internal burst is operational.
2001-07-30/31	V12M and V34M (180 Hz filters) in NM on all s/c	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2h 15mins Burst: V12H and V34H at 18 kS/s Trig on BP12	The L-filter (10 Hz) on SC2 probe 3 malfunctioned late in July. This implied V34L being useless for SC2, so V12M, V34M were put in HX in NM instead of V12L, V34L. During August, all s/c where run with this setting. Note that L filters are still in LX, to monitor SC2 P3 L-filter behaviour.
2001-08-05 12:16	Burst parameters V3U, V4U, trig on V12H Sweep interval 1h on 50% of all AIs, no sweeps on remaining 50%	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 1h/infinity Burst: V3U and V4U at 18 kS/s Trig on V12H	Unfiltered burst quantities and V12H trigger by request from Forrest. As sweeps may interfere with burst trigging, we better run more sweeps when on some AIs and none at all at other times.
2001-08-26 23:11	Burst parameters V1U, V2U, V3U, V4U Trig on V12M	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 1h/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s Trig on V12M	Four unfiltered quantities and V12M trigger on request by Forrest.
2001-09-02 23:19	V12M and V34M in NM on SC2 only Burst parameters V3U, V4U, trig on V12H	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC134: V12L, V34L HX in NM, SC2: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 1h/infinity Burst: V3U, V4U at 18 kS/s Trig on V12H	Keep M filters in NM only on the s/c where they are needed, i.e. SC2. Option of keeping V12L and V34M not considered useful as mixing filters on the same s/c causes problems for despinning etc. Reversion to pre-010826 burst settings for PP68 (by JSOC mistake)
2001-09-09	Burst parameters V3U, V4U, trig on V12H	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC134: V12L, V34L HX in NM, SC2: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 1h/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s Trig on V12M	Back to the burst settings of August 26.
2001-10-01 07:45	Increase sensitivity on burst trigger by factor of eight	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC134: V12L, V34L HX in NM, SC2: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 1h/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s Trig on V12M	Burst trigger: sum 8 values, no division.
2001-01-10 04:16	Sweep interval 20 minutes/infinity	All probes in E-field mode (current bias) -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC134: V12L, V34L HX in NM, SC2: V12M, V34M HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 20mins/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s Trig on V12M	Better take more sweeps when we actually do them, and let the rest of the data be free from this interference.
2002-02-01	SC1 probe 1 workarounds was gradually implemented from 2002-01-01 onwards: P1 in Langmuir mode (makes Vsc be calculated from P34), take V2L V34L in NM, base spin fits on P34 data, change order in LX list to put V3L into spin fit format.	All probes in E-field mode (current bias) -140 nA on all probes, except P1 on SC1 (voltage bias). Puck +1 V, guard -6.1 V HX in NM, SC1: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC34: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 20mins/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s Trig on V12M
2002-08-06	SC3 probe 1 workarounds: P1 in Langmuir mode (makes Vscbe calculated from P34), take V2L V34L in NM, base spin fits on P34 data, change order in LX list to put V3L into spin fit format.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 20mins/infinity Burst: V1U, V2U, V3U, V4U at 9 kS/s (V1U often replaced by V3H on SC13) Trig on V12M
2002-11-01	Burst quantities V1V2V3V4H (on SC13, V1H is replaced by V3U). Sweep details also changed, sweeps every 20 mins.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 20mins (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12M	After a long period with only infrequent sweeps (about twice per orbit), we started running them reqularly again.
2002-11-29	Sweeps every 2 hours.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12M
2003-01-25	Trig SC13 on BP12.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H at 9 kS/s (V1H replaced by V3U on SC13) Trig on BP12 (SC13), V12M (SC24)
2003-05-25	Use of flight s/w v 2.4 manually implemented on SC13 for planning periods 158 and 159.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H at 9 kS/s (V1H replaced by V3U on SC13) Trig on BP12 (SC13), V12M (SC24)
2003-06-08	Back to FSW 2.3 on SC13 for the June maneouvre period.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H at 9 kS/s (V1H replaced by V3U on SC13) Trig on BP12 (SC13), V12M (SC24)
2003-09-29 00:31	FSW 2.4 baseline on SC13, which means that (V23,V34) is now the baseline sample pair on SC13. No internal burst data dumped from SC13 (by mistake).	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: SC 24: V1H, V2H, V3H, V4H at 9 kS/s; SC13: no bursts Trig on V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2004-02-11 00:00	Eight-quantity burst at 4.5 kS/s (using 4 kHz sampling, i.e. undersampled data) is set as default. No internal burst data dumped from SC13 due to an erroneous setting of henceforth parameters.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: SC24: V1H, V2H, V3H, V4H, SCX, SCY, SCZ, BP12 at 4.5 kS/s; SC13 no bursts. Trig on V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2004-05-09 00:49	Eight-quantity burst at 4.5 kS/s (using 4 kHz sampling, i.e. undersampled data) is set as default. Bursts taken on all s/c after correction of henceforth parameter problem.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H, SCX, SCY, SCZ, BP12 at 4.5 kS/s (V1H replaced by V3U on SC13) Trig on BP12 (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2005-02-27 17:01	Changes: SC13: Trig burst on V12H SC24: Increase burst trig integration to 25 samples (1 sec)	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H, SCX, SCY, SCZ, BP12 at 4.5 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2005-04-09 03:33	Default burst changed to 4 quantities at 9 kS/s.	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2006-01-01 10:16	V2L rather than V23L on SC13 in NM (and change to start level of current sweeps)	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -140 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2006-06-16 23:30	Bias current changed to -100 nA because of decreased photoemission at solar minimum	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -100 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V2L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2006-07-01 06:06	Back to V23L (instead of V2L) on SC13 in NM	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -100 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX: V1L, V2L, V3L, V4L, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2007-06-01 17:20	Put M filtered data in LX (and change order of LX table) on SC2 to partially alleviate V1x failure	All probes in E-field mode (current bias), except P1 on SC13 (voltage bias). -100 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V12M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC13: V23M, V34M HX in BM1, SC24: V12M, V34M LX, SC134: V1L, V2L, V3L, V4L, BPC, BP12 LX, SC2: V1M, V2M, V3M, V4M, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC13) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)
2009-05-09 08:15	Workarounds for failed P4 on SC1 gradually implemented from this time.	All probes in E-field mode (current bias), except P1 on SC123 and P4 on SC1 (voltage bias). -100 nA on all probes Puck +1 V, guard -6.1 V HX in NM, SC13: V23L, V34L HX in NM, SC2: V23M, V34M HX in NM, SC4: V12L, V34L HX in BM1, SC123: V23M, V34M HX in BM1, SC4: V12M, V34M LX, SC134: V1L, V2L, V3L, V4L, BPC, BP12 LX, SC2: V1M, V2M, V3M, V4M, BPC, BP12 Sweep interval 2hrs (no sweeps when burst enabled) Burst: V1H, V2H, V3H, V4H) at 9 kS/s (V1H replaced by V3U on SC123, V4H by V2U on SC1) Trig on V12H (SC13), V12M (SC24) Bias current sweep data packed in 16 bit format (previously 13 bit)

Non-standard operations (after 2001-10-01)

List of non-standard operations (from XML database)

This list is intended to cover all non-standard operations of EFW, planned or accidental. At present, there are no entries before 2001-10-01, and there is a significant backlog for some periods. Standard operations are described above.

Documents, presentations etc

EFW operations

Operations presentation by Anders at EFW meeting 2005-02-07 [PDF]

Anomaly reports

SC1 P1 failure 2002-12-28: EFW-IRFU-AR-003 (v 1.0) [PDF, 1.3 MB], with separate Appendix C [PDF, 28 kB]
SC3 P1 failure 2002-07-29: EFW-IRFU-AR-004 (v 1.1) [PDF, 670 kB]

Resources and links

Page maintained by Anders Eriksson

Cluster EFW Operations

Contents

Introduction

WEC operations

Command log files

Commissioning

Calibrations

Standard operations

Brief EFW status info

ASPOC operations

EFW internal burst operations

Sweep operations

Accessing detailed information

Standard operations

Non-standard operations (after 2001-10-01)

Documents, presentations etc

Resources and links