BYU phase array feed.

feb 2010


Topics

    Sources:

    Observing plans:

    Observing log files

    History:


    All measurements, miscellaneous in chronological order

    BYU paf results:

    Misc:  (top)

     

    Articles:  (top)



Sources:  (top)

    Strong lband calibration sources available:

Source
Cat
Flux Jy
*-->1665
 Notes
point src calibrators
J0108+133
N
10.31*
maj,min :18.1,<16.2 . flux@1665. chris say 4' size?
J0137+331 (3C48)
C
13.67*
This transits @noon around 19apr10. freq @ 1665
J0318+164 (CTA21)
C 7.17*
flux @1665
J0437+296(3C123) N 54.9 maj,min 27.7,<18
J0502+252 N 5.7
maj,min  , 15.4,<18.5
J0521+166 (3C138)
C 8.27*
8% polarized @1600MHz
J1229+020 (3C273) N
54
maj,min 21.5,<15.9
J1331+305 (3C286)
C 13.32*
9% polarized @1600MHz.
J1330+251 (3C287)
N 6.26*
maj,min  < 16.0 < 15.55
J1347+122 N 5.02*
maj,min <18.2 < 17.1
J2014+23 (3C409) N
11.23*
maj,min 21,<14.8 (at 1665Mhz via chris salter).
J2123+250 (3C433)
N
10.27
maj,min 19,<13.9 (chris says 2')
J2232+117
N
7.2
maj,min <19,<17
J2253+161 (3C454.3) C 13.34* This is a variable. Strength probably different.
extended sources
J0534+22(crab)
N
324
maj,min 127,127
053428.03 +2202 02.5
M87 (.25 deg) image
M87 (.25 deg) contour map: (.ps) (.pdf)
123049.46 122321.6
N 138
maj,min 48.4 18.7
J1648+0504 (3C348) Hercules A

47
at least a double...
16 51 11.70 +04 59 19.0 23Jy
16 51 3.85 +04 59 41.9 11.1 Jy
16 51 4.94 +04 59 42.3 8.5 Jy
192342.51 143031.1
 (W51 image .5 deg square)
W51 contour map (.ps) (.pdf)
N 36.8
maj,min 83.9,63.7
B2018+295 (3C410)
C 8.65
size:41 arc secs
B2121+248 (3C433)
C 10.63
size 120 arc secs




J1538+147 (.ps) (.pdf) contour map
N
.012
12 mJy (peak) nvss source . 40 sec integrations.

Source ra,dec, rise/transit/set times  (top)

ra,dec for sources
rise,transit,set, keyhole lst times for sources

 The plots show Tracking time for each source (.ps) (.pdf):

processing:x101/projects/byuPhAr/online/srcshed.pro

Possible problems tracking sources: (top)


Communications: AO and BYU computer   (top)

23feb10: Here are my latest ideas on the communications between the BYU computer and the AO control system.

MESSAGES AOCONTROL TO BYU  SYSTEM
Function
aocmd
byuReply
notes
initialize BYU
INIT
init stat info
if reply stat= err  then info can hold an error message
After the reply, the BYU system should be ready to accept datataking requests
Example:
INIT
setup
SETUP aoinfo
setup stat info
keyword values passed from ao to byu prior to start of datataking
keyword
typical value
info
N_EL
33
# elevation steps entire pattern
N_XEL
33
# cross elevation steps
ST_EL
1..33
1st elevation step this run (count from 1)
ST_XEL
1.33
1st cross elevation step this run.
ASTEP
.8333
great circle angle step in Amin (or do you prefer deg?)
TM_SECS
10
integration time in seconds.
FOCUS
0.
Focus offset for this run (inches).
OFF_STEER
0,1,2,3
specify whether cal offs are done or not:
0 - no cals, 1- cal at start, 2-cal at end, 3 cal at start and end
All cal offsets will step 1 degree in the axis of motion:
grid -1deg start, +1deg end in xel
cross : az arm = 1 deg in xel
            el arm  = 1 deg in el
POS
B0,C1,D1
positioner name. values are:
B0,C1-C6,D1-D6. see plots
SRC
J1347+122
source name

I'd like the ra,dec to come with each start command at each point. If this is not possible let me know.
Reply if stat =err then info can hold the error message.
Example:
SETUP N_EL=33 N_XEL=33 ST_EL=1 ST_XEL=1 ASTEP=.83333 TM_SECS=10 FOCUS=0 OFF_STEER=0 POS=B0 SRC=J1347+122

start datataking
START aoinfo
start stat byuinfo
aoinfo: elOffDeg azOffDeg hhmmss ddmmss seqNumber
  • elOffDeg, azOffDeg: the great circle offsets from the source center in degrees that the telescope moved. the beam offsets on the sky will be minus these values.
  • ra,dec position we are tracking at the start of the integration (j2000)
  • seqNumber 1..NxM + off_steer offs. If off_steer-1 or 3 then the first seqnumber is the off, not the first gridpnt
The reply should come back right before the BYU system starts taking data.
The AO system will wait for the integration time and then start the telescope moving to the next position.
This will save the pipeline delay of about 2 seconds when tracking a new position.
The BYU system should not  expect another cmd until the integration time is up.
We can hardwire the integration time or make it a setup parameter.
We can add whatever other info you need to aoinfo.
Example:
START .01 .02 013741.3  330935.1 1
AO will exit
EXIT
none
This tells BYU that AO is exiting.. It will close the socket and not wait on the reply.
BYU should go back to listening on the socket.

Ip addresses/gateways  (top)


    The ip addresses/gateways to use are:



The byu mapping routines:  (top)

    The routines available are:
Higher level routines: Lower level routines:

Time to execute patterns:

    The time to execute the patterns is shown in the table below.

Time for patterns (excluding slew to source times)
Observation
step (Amin)
time (secs)
notes
byumap 7x7 (12may09)
1.5
570
no cal scans
byucross 31x31 (12may09)
.6 (hpbw/5)
508
nocal
byupntdipoles 19pnts (12may09)
dipole spacing using
13.88 asec/cm for x and y.
205
nocal. move to each dipole center



The positioner  (top)

    The feed will sit on a movable mount that can move in focus as well as the xy plane perpendicular to focus.

Controller:aires 9000 4 axis controller from parker motion.


Articles (top)


Measurements/Misc.:  (top)


Byu paf results  (top)

Note:


31x31 super fine grid sensitivity maps:  (top)

15x15 fine grid sensitivity maps: (top)


7x7 grids at locations A0-A6 for focus=-8,0,10,20. Sensitivity maps  (top)

Z focus scan results

BEAM PATTERNS


Extended sources

Weak sources:

Frequency Scan

Absorber:



History  (top)

equipment/software changes changes  (top)

Super fine grids 31x31 done  (top)

Fine grids done (15x15) done (top)


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