Diff for "TelescopeSystemStatus" - www.iram.es Main Wiki

Differences between revisions 1 and 115 (spanning 114 versions)

System - General

The 30-m telescope is now operating using the New Control System (NCS)

[http://www.iram.es/IRAMES/ncs30m/ NCS documentation] [http://mrt-lx1/mainWiki/ Wiki with up-to-date Notes on NCS]

NCS supports only source coordinates in Equatorial J2000.0 system. (More systems will be made available as soon as possible)

Observations near and towards the Sun are not yet supported.

NCS supports observing modes and source offsets in:

Projection "Radio" (same offsets as in old CS) in Equatorial J2000.0
"true angle" horizontal
Nasmyth (receiver offsets)

All 4 Switching Modes are supported by the NCS (total power, beam switching, wobbler switching, frequency switching.)

Observations with "rotated" wobbler and the bolometer are now possible within the pool; contact the pool manager, Stephane Leon, on how to prepare such observations. After finishing with rotated Wobbler, make sure that the operator puts the rotation back to exactly 0 degrees.

Observing modes supported by the NCS:

Calibrate (for heterodyne)
Pointing
Focus
Tip
Track
- Frequency Switching
ON-OFF
- Position Switching
- Wobbler Switching
On-The-Fly Map
- Heterodyne
  - Total Power (like Position Switching)
  - Frequency Switching
- Bolometer
  - Wobbler Switching
VLBI

Automatic calibration and processing of heterodyne data using the MIRA software is in operation for all observing modes. MIRA can also be used manually and offline.

$/!\$ Online data processing, in some circumstances, still may have problems with scans extending over midnight. Please check data and report problems to Albrecht Sievers. It may be safer to avoid long scans extending over midnight.

[#beginOfPage Back to top]

Antenna

[#beginOfPage Back to top]

Wobbler

[#beginOfPage Back to top]

Pointing Model and Focus

The Pointing Model is maintained with respect to the receiver B100. The misalignment and focus error (D-focus) of the other receivers with respect to B100 is the following:

  Rx       misal.(")       date            D_focus(mm)       date
 A100     0.16 ±0.06     27-Feb-07,        +0.09 ±0.03     13-Mar-07
 A230     1.34 ±0.18     27-Feb-07,        +0.43 ±0.02     13-Mar-07
 B100     0.00                              0.00
 B230     1.74 ±0.16     27-Feb-07,        +0.40 ±0.10     17-Apr-07
 C150     1.26 ±0.24      5-Feb-07,        +0.64 ±0.13     17-Apr-07
 C270     0.78 ±0.18      5-Feb-07,        +0.36 ±0.15     17-Apr-07
 D150     1.03 ±0.13     12-Mar-07,        +0.26 ±0.02     12-Mar-07
 D270     1.40 ±0.19     12-Mar-07,        +0.18 ±0.05     12-Mar-07

heterodyne: last model update: 2007-10-23, 40 points, previous rms = 3.44", new rms = 1.69"

bolometer: last model update: 2007-11-16, 36 points, new rms < 1.5"

$/!\$ Pointing on spectral line sources like SiO masers is not yet supported by the data processing.

[#beginOfPage Back to top]

SIS Receivers

A, B, C, D receivers are supported by NCS for observations.

Image/Signal gain-ratio calibration is supported by NCS, processing in MIRA. It is highly recommended to use this.

A standard table of T_cold calibration temperatures for A, B, C, D receivers is implemented in NCS. This built-in table covers most frequencies. $/!\$ Outside this range, T_cold has to be set manually.

Tables and plots are now at http://gra-lx1/mainWiki/ReceiverGroupColdLoadPlotsCurrent 2007-10-11 dj

$/!\$ Receiver C150 shows low continuum signal at the higher frequencies (>168 GHz). It has to be fully checked. Use D150 instead. (2005-11-16)

[#beginOfPage Back to top]

HERA

HERA is supported by the NCS. (2006-02 HU)

Second polarization installed. BR SSB tuning tables for standard frequencies. BR Sideband rejections not determined (2004-12-01 AW). Use standard value of 0.1! BR

For HERA calibration, measured values of the load temperatures are automatically used!

$/!\$ Watch the computer control of the derotator closely (2002-12-22). BR $/!\$ Make sure the derotator tracking is stopped after observations, i.e., set to zero degrees in "frame". BR

$/!\$ The automatic tuning of both HERA1 and 2 can be improved by manually changing the mixer current according to DJ; HERA Pool managers should be aware of this, and operators will receive training (2007-09-19 RM)

HERA 2 is more noisy than HERA 1, limiting HERA2's useful frequency range to below about 242 GHz (2006-09-27 HU according to info from SN)BR

[#beginOfPage Back to top]

Pointing and Flux monitoring with SIS receivers:

Continuum instability ("ripple") can occur with all receivers, making pointing and focusing difficult.

In general some receivers are better than others in this respect as summarized here:

A100 generally OK for pointing. (2003-11-12) BR B100 OK, is best for pointing. B100 is the standard reference for the heterodyne pointing modelBR $/!\$ C150 often bad for pointing, ripple. (2002-07-16) BR D150 generally good performance for pointing.(2002-07-16) BR $/!\$ A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) BR B230 OK BR $/!\$ C270 can be unstable and difficult for pointing. (2007-04-30) BR $/!\$ D270 can be unstable and difficult for pointing. (2002-07-16) BR With HERA pointing may be difficult using beam switch mode - total power mode may give better results but requires excellent weather BR

[#beginOfPage Back to top]

Bolometers

Bolometer Observations are supported by the NCS.

Mambo1: OFFLINE

Mambo2 was re-installed and commissioned the week 13.11.2007/20.11.2007

[#beginOfPage Back to top]

Backends

Support by NCS:

Continuum Backends for heterodyne receivers
4 MHz Filterbanks
1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels
WILMA for observations with HERA
VESPA
ABBA for MAMBO bolometer
$/!\$ the 100 kHz Filterbank is decommissioned. (RM, HU, 19.9.2007)

[#beginOfPage Back to top]

Computer/Software

$/!\$ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU). Note that the NCS supports most essential features, but still has some limitations! See the NCS documentation for details, in particular links from the Wiki [https://mrt-lx1.iram.es/mainWiki/OperationNotesObservers NCS Operation Notes for Observers]

$/!\$ Pako does not run under the default gildas version on mrt-lx3, mrt-lx2. Use gag_aug06 before starting pako (2008-01-15 AS). Note: the instructions to start pako explicitly say to run it on mrt-lx1. The 'tricksuggested by AS for mrt-lx2, mrt-lx3 may work, but it is not guaranteed.

[#beginOfPage Back to top]

Other Items

Remote observing via VNC is available from Granada, Grenoble, and Bonn. Coordinate with Walter Brunswig.

[#beginOfPage Back to top]

Updates/History

To see the changes between the actual and the last version, please see Show Changes in the Wiki Interface. If you want to see the Revision History of this page, please see Get Info in the Wiki Interface.

[#beginOfPage Back to top]

Legend

: OKBR $/!\$ : WarningBR : ErrorBR
The wiki markup of these icons is:
(./) : OK /!\ : Warning {X} : Error
[#beginOfPage Back to top]

-  ⇤ ← Revision 1 as of 2005-04-21 16:25:33 → 
  Size: 4572
  Editor: gra-lx8
  Comment:
+   ← Revision 115 as of 2008-03-19 18:42:38 → ⇥
  Size: 7861
  Editor: HansUngerechts
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
+##language:en
#pragma section-numbers off
-Line 3:
+Line 5:
-= Telescope System Status =
-Line 5:
+Line 6:
-''(Date 2004-12-01)''
-Line 11:
+Line 9:
+The 30-m telescope is now operating using the New Control System (NCS)
-Line 12:
+Line 11:
-NORMAL OPERATION
+ . [http://www.iram.es/IRAMES/ncs30m/ NCS documentation]
 [http://mrt-lx1/mainWiki/ Wiki with up-to-date Notes on NCS]
NCS supports only source coordinates in Equatorial J2000.0 system.  (More systems will be made available as soon as possible)

Observations near and towards the Sun are not yet supported.

NCS supports observing modes and source offsets in:

 * Projection "Radio" (same offsets as in old CS) in Equatorial J2000.0
 * "true angle" horizontal
 * Nasmyth (receiver offsets)
All 4 Switching Modes are supported by the NCS (total power, beam switching, wobbler switching, frequency switching.)

 * Observations with "rotated" wobbler and the bolometer are now possible within the pool; contact the pool manager, Stephane Leon, on how to prepare such observations. After finishing with rotated Wobbler, make sure that the operator puts the rotation back to '''exactly 0 degrees'''.
Observing modes supported by the NCS:

 * Calibrate (for heterodyne)
 * Pointing
 * Focus
 * Tip
 * Track
  * Frequency Switching
 * ON-OFF
  * Position Switching
  * Wobbler Switching
 * On-The-Fly Map
  * Heterodyne
   * Total Power (like Position Switching)
   * Frequency Switching
  * Bolometer
   * Wobbler Switching
 * VLBI

Automatic calibration and processing of heterodyne data using the MIRA software is in operation for all observing modes. MIRA can also be used manually and offline.

/!\ Online data processing, in some circumstances, still may have problems with scans extending over midnight.  Please check data and report problems to Albrecht Sievers. It may be safer to avoid long scans extending over midnight.
-Line 17:
+Line 51:
+(./) OK
-Line 18:
+Line 53:
-OK
-Line 23:
+Line 57:
-Avoid wobbler throw of 120"; with a throw of 120" the specification of a phase time may not work properly.  With a throw of 119 or 121 is should be OK. (2003-07-09)
Results from first pointing after unlocking the wobbler can be  wrong! Usually it's sufficient to ignore the first pointing and repeat the pointing (2003-07-09)

Wobbler rotation implemented. Current range: +/- 60deg (2004-12-01 AW)
+(./) OK
-Line 31:
+Line 61:
-== Pointing Model ==
+== Pointing Model and Focus ==
The Pointing Model is maintained with respect to the receiver B100. The misalignment and focus error (D-focus) of the other receivers with respect to B100 is the following:
-Line 33:
+Line 64:
-heterodyn: OK (last model update: 2004-11-17 ).
bolometer: OK (last model update: 2004-11-02 ).
+{{{
  Rx       misal.(")       date            D_focus(mm)       date
 A100     0.16 ±0.06     27-Feb-07,        +0.09 ±0.03     13-Mar-07
 A230     1.34 ±0.18     27-Feb-07,        +0.43 ±0.02     13-Mar-07
 B100     0.00                              0.00
 B230     1.74 ±0.16     27-Feb-07,        +0.40 ±0.10     17-Apr-07
 C150     1.26 ±0.24      5-Feb-07,        +0.64 ±0.13     17-Apr-07
 C270     0.78 ±0.18      5-Feb-07,        +0.36 ±0.15     17-Apr-07
 D150     1.03 ±0.13     12-Mar-07,        +0.26 ±0.02     12-Mar-07
 D270     1.40 ±0.19     12-Mar-07,        +0.18 ±0.05     12-Mar-07
}}}
heterodyne: last model update: 2007-10-23, 40 points, previous rms = 3.44", new rms = 1.69"
-Line 36:
+Line 77:
-Operator/AOD: Check regularly that automatic P4 P5  is working (2002-12-13).
Narrowband continuum pointing (for SiO masers) is out of service! (2003-07-09, 2003-07-30)
+bolometer: last model update: 2007-11-16, 36 points,  new rms < 1.5"

/!\ Pointing on spectral line sources like SiO masers is not yet supported by the data processing.
-Line 40:
+Line 82:
-Line 43:
+Line 85:
-A, B, C and D receivers are aligned within  3", checked (2003-09-24)
+(./) A, B, C, D receivers are supported by NCS for observations.
-Line 45:
+Line 87:
-Calibration Tcold temperatures have been checked by receiver group.
New scaling factor of 1.0 has been implemented into obs.
Obs Tcold should be ok (2004-01-17)
+(./) Image/Signal gain-ratio calibration is supported by NCS, processing in MIRA. It is highly recommended to use this.

(./) A standard table of T_cold calibration temperatures for A, B, C, D receivers is implemented in NCS. This built-in table covers most frequencies.  /!\ Outside this range, T_cold has to be set manually.

(./) Tables and plots are now at http://gra-lx1/mainWiki/ReceiverGroupColdLoadPlotsCurrent 2007-10-11 dj

/!\ Receiver C150 shows low continuum signal at the higher frequencies (>168 GHz). It has to be fully checked. Use D150 instead. (2005-11-16)


[#beginOfPage Back to top]

== HERA ==
(./) HERA is supported by the NCS. (2006-02 HU)

Second polarization installed. [[BR]] 
SSB tuning tables  for  standard frequencies. [[BR]] 
Sideband rejections not determined (2004-12-01 AW).  Use standard value of 0.1! [[BR]]

(./) For HERA calibration, measured values of the load temperatures are automatically used!

/!\ Watch the computer control of the derotator closely (2002-12-22). [[BR]] /!\ Make sure the derotator tracking is stopped after observations, i.e., set to zero degrees in "frame". [[BR]]

/!\ The automatic tuning of both HERA1 and 2 can be improved by manually changing the mixer current according to DJ; HERA Pool managers should be aware of this, and operators will receive training (2007-09-19 RM)

HERA 2 is more noisy than HERA 1, limiting HERA2's useful frequency range to below about 242 GHz (2006-09-27 HU according to info from SN)[[BR]]
-Line 52:
+Line 117:
+Continuum instability ("ripple") can occur with all receivers, making pointing and focusing difficult.
-Line 53:
+Line 119:
-Continuum instability ("ripple") can occur with all receivers, making pointing and focussing difficult.
 In general some receivers are better then others in this respect as summarized here:
+In general some receivers are better than others in this respect as summarized here:
-Line 56:
+Line 121:
-    A100 generally OK for pointing. (2003-11-12)
    B100 OK, will be replaced  (2003-11-12)
    C150 often bad for pointing, ripple. (2002-07-16) 
    D150 generally good performance for pointing.(2002-07-16)
    A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) 
    B230 OK, will be replaced (2003-11-12)
    C270 very bad for pointing at 265 Ghz. (2002-07-16)
    D270 can be unstable and difficult for pointing. (2002-07-16)
    HERA pointing difficulties using beam switch mode - total power mode gave better results (2004-01-17)

[#beginOfPage Back to top]

== HERA ==

Second polarization installed. One blind pixel.
No SSB tuning tables except for few standard frequencies.
Sideband rejections not determined   (2004-12-01 AW)


Watch the computer control of the derotator closely (2002-12-22). 
Make sure the derotator tracking is stopped after observations, i.e, set to zero degrees in "frame".
With VESPA, only two spectra per pixel can be used.
+ . A100 generally OK for pointing. (2003-11-12) [[BR]] B100 OK, is best for pointing. B100 is the standard reference for the heterodyne pointing model[[BR]] /!\ C150 often bad for pointing, ripple. (2002-07-16) [[BR]] D150 generally good performance for pointing.(2002-07-16) [[BR]] /!\ A230 often unstable, bad for pointing and flux monitoring. (2003-11-12) [[BR]] B230 OK [[BR]] /!\ C270 can be unstable and difficult for pointing. (2007-04-30) [[BR]] /!\ D270 can be unstable and difficult for pointing. (2002-07-16) [[BR]]
 With HERA pointing may be difficult using beam switch mode - total power mode may give better results but requires excellent weather [[BR]]
-Line 83:
+Line 127:
-Mambo II is installed and ready for operation (AW 2004-12-01)
+Bolometer Observations are supported by the NCS.

Mambo1: OFFLINE

Mambo2 was re-installed and commissioned the week 13.11.2007/20.11.2007
-Line 88:
+Line 136:
+Support by NCS:
-Line 89:
+Line 138:
-MHz shift in 100kHz FB header (AW 2004-12-01)
 Software and/or hardware problem in the 1MHz FB  - problem is currently investigated (AW 2004-12-01)
 Spikes in VESPA at intersection of different units (AW 2004-12-01)
+ * Continuum Backends for heterodyne receivers
 * 4 MHz Filterbanks
 * 1 MHz Filterbank in parts of 256, 512, 768, or 1024 channels
 * WILMA for observations with HERA
 * VESPA
 * ABBA for MAMBO bolometer
 * /!\ the 100 kHz Filterbank is decommissioned. (RM, HU, 19.9.2007)
-Line 97:
+Line 149:
-Mirroring between IRAM Grenoble ( http://www.iram.fr ) and Granada( http://www.iram.es/ ) websites sometimes takes several days to update.   (2003-07-01)
+/!\ The 30-m telescope is now operating using the New Control System (NCS) (2005-11-30 HU). Note that the NCS supports most essential features, but still has some limitations! See the NCS documentation for details, in particular links from the Wiki [https://mrt-lx1.iram.es/mainWiki/OperationNotesObservers NCS Operation Notes for Observers]

/!\ Online data processing, in some circumstances, still may have problems with scans extending over midnight.  Please check data and report problems to Albrecht Sievers. It may be safer to avoid long scans extending over midnight.

/!\ Pako does not run under the default gildas version on mrt-lx3, mrt-lx2. Use '''gag_aug06''' before starting '''pako''' (2008-01-15 AS). Note: the instructions to start '''pako''' explicitly say to run it on mrt-lx1.  The 'trick''suggested by AS for mrt-lx2, mrt-lx3 may work, but it is not guaranteed.
-Line 102:
+Line 158:
+ * (./) Remote observing via ''VNC'' is available from Granada, Grenoble, and Bonn.  Coordinate with Walter Brunswig.
[#beginOfPage Back to top]
-Line 103:
+Line 161:
-OK
+== Updates/History ==
To see the changes between the actual and the last version, please see '''''Show Changes''''' in the Wiki Interface.  If you want to see the Revision History of this page, please see '''''Get Info''''' in the Wiki Interface.
-Line 107:
+Line 166:
+== Legend ==
(./) : OK[[BR]] /!\ : Warning[[BR]] {X} : Error[[BR]]
-Line 108:
+Line 169:
-== Updates/History ==
+The wiki markup of these icons is:
-Line 110:
+Line 171:
-''(in reverse order by date!)''

    2004-12-01 AW [[BR]]
    2004-07-24 RM [[BR]]
    2004-03-24, 25 HU [[BR]]
    2004-01-17 AW [[BR]]
    2003-11-12 HU [[BR]]
    2003-09-25 MR [[BR]]
    2003-09-08 HU [[BR]]
    2003-08-20 HU [[BR]]
    2003-08-05 AS [[BR]]
    2003-07-09 RM [[BR]]
    2003-07-01,04/5, 7 HU [[BR]]
    2003-06-08, 09 HU [[BR]]
    2003-04-22, 26 HU [[BR]]
    2003-04-06 AS [[BR]]
    2003-03-31 HU [[BR]]
    2003-03-20 RM [[BR]]
    2003-02-11 AW [[BR]]
    2003-01-10, 2003-01-17, 2003-02-05 RM [[BR]] 
    2003-01-14 TG [[BR]]
    2003-01-03, 06 HU [[BR]]
    2002-12-31 HU [[BR]]
    2002-12-21, 22 HU [[BR]]
    2002-12-19 RM [[BR]]
    2002-12-13, 14, 15, 16 HU [[BR]]
    2002-12-11 RM [[BR]]
    2002-12-05  TG [[BR]]
    2002-11-27 RM [[BR]]
    2002-11-05 AW [[BR]]
    2002-10-18 DJ [[BR]]
    2002-10-15 DJ [[BR]]
    2002-10-09, 12, 14 HU [[BR]]
    2002-10-08 AW [[BR]]
    2002-09-27 TG [[BR]]
    2002-09-26 DJ [[BR]]
    2002-09-23 AW [[BR]] 
    2002-09-11/12, 17 HU [[BR]]
    ... (?) [[BR]]
    2002-08-07,10 HU [[BR]]
    2002-07-22 DJ [[BR]]
    ... (?) [[BR]]
    2002-07-16  HU [[BR]]
    ... (?) [[BR]][[BR]]
+{{{
(./) : OK
/!\ : Warning
{X} : Error
}}}
-Line 156:
+Line 177:
-'''Created by R. Mauersberger, June 18th, 2002'''