Notes on running the Multibeam Correlator Software with tkmulti
Or try the ATNF
especially for more detail on SPD and MBD.
You will need to use a terminal or computer which supports XWindows
and a terminal local to ARTHUR (eg. the Observing room Falco).
Running the telescope interface software on ARTHUR - MULTI The process
which moves the telescope and starts triggers the correlator software is
called MULTI. It must be run on a local VAX terminal (not from a window
in a Unix box). It should be the first process started.
Log in to ARTHUR as MULTI.
Type multi at the prompt.
Reply yes when it asks whther you wish to continue.
NOTE: This program should be run from the login directory (this is where
you are after logging on to ARTHUR) or from multi$work.
Running the VAX Correlator driving software from a Unix box - MBCORR
This software starts multiple processes that configure the correlator,
start and stop integrations, collect the correlator output and stash it
in RPFITS files. It need an X-windows system, but runs ARTHUR. (It doesn't
run very well on the b/w Tektronix terminal - so use a unix box).
Start a Xsession on the computer of your choice.
If necessary, allow access to your computer by ARTHUR, (xhost +arthur).
Telnet to Arthur and Login as MULTI.
Set Arthur to produce output on your screen as follows:
xdisplay xxxx /serve=n
where xxx is the name of your unix box (and optionally, n is the number
of the desktop eg. for vncviewer running on oddjob:2 you would use xdisplay
oddjob /serve=2). If this doesn't work try....
Create 3 DECTerms as follows
On a DECTERM window start the correlator driver MBCOR
Running the scheduling GUI from a Unix Box - tkmulti
Log in to oddjob. If necessary route the display to your screen, using
xhost oddjob and
setenv DISPLAY xxxxxx:0
Commands for tkmulti
To run a schedule
Other tkmulti operations
ftp the schedule to the multi$sch directory on ARTHUR.
If pulsars are using the telescope, ask the controller to stop the timing
Make sure that the controller has passed command to ARTHUR.
In tkmulti's Multi command entry ENABLE ANTENNA
(You can take data from a stationary or otherwise positioned telescope
- eg controller, pulsars, TELC program on ARTHUR by ommitting this step,
or by DISABLE ANTENNA, if you have previously enabled it). THE TELD program
on ARTHUR will show you who currently has control of the telescope.
To rotate receiver or shift the Reference beam type ENABLE FCC
You should see OK on the logging screen and Anenna enabled, fcc enabled
on the multi display.
To position a beam on source (rather than the centre of the array, type
Enter the schedule name (case insensitive - without directory or extension)
in the Schedule box. If the schedule is OK, multi will return the scan
details in the tkmulti logging screen. (Sched - File Browse mostly hangs
tkmulti, but sometimes it'll bring up the schedule directory listing on
ARTHUR. Unfortunately it then refuses to find the selected file!) Use a
spare window logged into ARTHUR to list the mutli$sch directory.
Pull down the Sched menu and click START (Don't use the Top line start
Check the displayed frequency and bandwitdh are correct.
To interrupt a schedule at the end of the current scan, pull down the Sched
menu and click FINISH. To interrupt immediately, click the Stop button
(top of screen). In both cases if you have finished, observing, it is useful
to type CLOSEFILE in the multi command box (bottom right).
to change mbcor configuration, in Multi command entry (bottom rightish)
(MB1MOD is a single beam setup, MB4MOD is a 4 beam setup - both 64MHz)
to change centre frequency
FREQUENCY nnnn.nnn (MHz)
to change bandwidth
and CONFIG xxxxxx where xxxxxx is a suitable config file
To start the correlator integrating
use START SCAN button (top leftish)
To stop use STOP button
Utility SAVE config (bottom right) will save current tkmulti settings
To finish - VERY IMPORTANT Either
shutdown the multi / tkmulti processes completely as follows
in tkmulti's Multi command entry type QUIT (this shuts down multi).
Then Exit (bottom right) tkmulti.
This will leave the multibeam correlator running on ARTHUR, but that
can be left unless you wish to logout. (multi /tkmulti can be restarted
for later tests if the mbcorr processes are left running). Multi should
be started first, then tkmulti.
To shut down MBCOR on ARTHUR, type QUIT in the MBCOR window. Logging
out of the DECTERM where you started MBCOR is the easiest way of closing
all the MBCOR windows.
Leave everything running, but release control of the telescope by typing
DISABLE ANTENNA in tkmulti's multi command window. (It is also a good idea
to type Closefile - see Problems section!)
Last modified: Wed Jun
14 17:28:34 BST 2000