EFOSC2 

ESO Faint Object Spectrograph and Camera
 
 
  
jP2PP for EFOSC2 
Pre-Observing (in the La Silla Computer Room) At the telescope control room Only an outline of the steps for running  jP2PP is given here. Refer to the Main jP2PP Web Page for a more detailed description and the latest manual. A description of different observing modes and the corresponding jP2PP parameters is available at Observing Modes.
 
Pre-Observing (in the La Silla Computer Room)

Getting Started

Login as user 360v1 or 360v2 or 360v3 on the machine kila using one of the X-terminals in the computer room in the main office building below the hotel. The password may be obtained from the support astronomer.

Type  bin/startjp2pp  in the home directory and when prompted type in your P2PP username and password (usually emailed to you by the support astronomer a few weeks before your run) and then sit back and relax while the package takes its time to open the jP2PP workspace panel. If this is the first time the program will download the details of the observing programme from ESO Garching and store it on the local disk; on subsequent occasions the locally saved information will be sufficient for running jP2PP.

Select the appropriate ESO Observing Period (top right) and Programme (listed under Folders on the left)    .....   and then you are in business

A Brief Overview of the jP2PP  Main Panel

There are 2 types of blocks generated by jP2PP: ObsBlocks, which require a target position, and CalBlocks, which have no provision for defining a target or an Acquisition template (the terminology is unforunately a bit confusing since they both generate what is called an OB or observing block which is what is used to execute the observations). The two are catalogued separately and cannot be changed from one type to another. Select one or the other by clicking on the appropriate button; this will automatically list all the existing OBs of that category (1 OB in each row).

There are 4 buttons on the top left corner  New  to open a new OB,  Duplicate  to duplicate an existing OB,  Verify  to verify that the OB has been defined without any errors and  View  to view /edit the parameters of an OB.  The last 3 options require that an existing OB be selected ; the selected OB is highlighted with white script on a blue background while the others are black on white. The selection can be changed by clicking on the desired OB with the left mouse button.

Several fields of each OB are displayed on the main panel. Fields of relevance to a 3.6m/EFOSC2 user are Name, Target and Acquisition. The widths of the columns can be changed (using the left mouse button) to display these fields to the fullest advantage while shrinking the others.

A New CalBlock OB from Scratch

Images of typical OB Panels for each of the EFOSC2 observing modes may be found by following the links on  Observing Modes.

Step 1
 

Step 2 Step 3 A combination of several Step B and Step C can be used to build an OB with a variety of templates in the required order. However, indiscriminate mixing of templates within a single OB, while permitted, is bad practice and could lead to mix-ups  during the night in certain cases; mixing certain kinds of templates does make for more efficiency but not for all types.

An erroneous definition of an OB will be indicated by red characters on the OB panel and a red spot against the OB in the main panel. The telescope will not be able to execute such an OB.

One can  rearrange the sequence of templates in an OB by the simply dragging a template from its current location to the desired location using the left mouse button.

An unwanted template may be deleted by clicking on the Delete button on the top left.

Note : in case of DuplicateDelete  and  rearranging the sequence of templates the template in question has to be first selected by clicking on it (i.e. anywhere on the column with the defined values).

A New ObsBlock OB from Scratch

This is very similar to generating a CalBlock but for the following differences:

A New OB from an Existing OB

Select the OB on the main panel and click on Duplicate  to obtain a replica which only differs in its Name (original name with an additional numerical suffix). This can then be modified using the methods described above.

Exporting the OBs into ASCII files

The OBs generated will be stored as binary files in the directory jp2pp-cache/####.dir  where  #### is the P2PP code of the observer. However these have to be transferred as ascii files across machines. They can be converted to appropriate ASCII files using the Export option in the main panel of jP2PP.

  • Create a sub-directory  jp2pp-cache/impex/####  where  #### is your P2PP user code.
  • Highlight all the required OBs (refer to the jP2PP manual for highlighting many OBs at once).
  • Select  Export  found under the File  button on the main panel and export files to the above sub-directory. This has to be done separately for  ObsBlocks  and  CalBlocks
  • At the telescope control room

    Import the previously generated OBs
    (The support astronomer will assist the observer in this)

    OBs can now be generated, deleted, modified as before

    Scheduling  Observations

  • The observer only needs to highlight a particular OB and inform the telescope operator who will pull it across the network into the machine which controls the telescope and the instrument.
  • jP2PP needs to be idle (with the OB highlighted) only at the instant when the operator is pulling the OB across. At all other times the observer can edit and add to his/her list of OBs even when observations are going on
  • OBs can be selected in any order with no reference to the sequence in which they were generated.The only constraint is that jP2PP must be running while observations are going on.
  • Some General Comments

    After some practice (a couple of hours) one can generate a new OB in some 5-10 minutes, typically. It is even faster to duplicate an existing OB and modify the replica. So it is not necessary to have every OB prepared before a run. A good strategy would be to prepare OBs for the first night or half night and prepare the rest during the night (provided the observing programme does not consist of very shoft exposures of a large number of sources)

    Preparing OBs during the run also means that one can fine-tune one's strategy depending on the observing conditions and experience gleaned from the first few observations. However this should not be taken to mean that one should enter the Control Room with no preparation at all!


    Send comments to: ls-spectro

    Last modified: Sun Jan 13 02:34:36 CLST 2002 

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