-- RunaBriguglio - 01 Apr 2010

Start of telescope operations:

01:52UT

telescope is pointed to zenith; the "ear" on the shell side is not visible (i.e. the largest gap is 39um)

shell set successfully at first attempt, 02:02UT:

Maximum mode index used to apply flat -> # 232
COMM MAX [m] 7.75848e-05
FORCE MAX [N] 0.290752

Environmental conditions

the sky is a bit cloudy; strong wind. the dome is closed

02:12UT the shell is manually ripped, then set successfully again.

Maximum mode index used to apply flat ->232
COMM MAX [m] 7.75814e-05
FORCE MAX [N] 0.290865

at ripped position the "ear" is still not visible.

The dome will not be opened now, because of the strong wind. We will wait for system thermalization, then we will move the telescope at various elevations and load the default shape. this, to verify the repeatability of the flattening command at different elevations

problem with astigmatism correction?

the shell is set and the telecope is at zenith position. an astigmatism correction (PtV =12um) is applied at a 20s cadence, with opposite signs (i.e. the shell is set at a give moment T0, at T0+20 a 12umPtV astigm is applied, at T0+40 the correction is cancelled).

verify using the following time stamp:

20100401_022728 initial shape

20100401_022748 astigm applied

20100401_022808 initial shape restored

02:34:51 shell manually ripped, then re-set again

Maximum mode index used to apply flat -> # 238
COMM MAX [m] 7.75874e-05
FORCE MAX [N] 0.286864

the astigmatism correction is still working...

Load_shape at different elevations

we will move the telescope at various elevation, then set the shell using the MirrorSet command. After the set is completed, the telescope will be moved 10° lower. the slew will cover the range 90-->20.

80°

Maximum mode index used to apply flat -> # 232
COMM MAX [m] 7.75732e-05
FORCE MAX [N] 0.284243

70°

Maximum mode index used to apply flat -> # 232
COMM MAX [m] 7.75688e-05
FORCE MAX [N] 0.294407

60°

Maximum mode index used to apply flat -> # 240
COMM MAX [m] 7.76340e-05
FORCE MAX [N] 0.309323

50°

Maximum mode index used to apply flat -> # 220
COMM MAX [m] 7.76309e-05
FORCE MAX [N] 0.328830

40°

Maximum mode index used to apply flat -> # 175
COMM MAX [m] 7.75538e-05
FORCE MAX [N] 0.312679

30°

Maximum mode index used to apply flat -> # 187
COMM MAX [m] 7.76540e-05
FORCE MAX [N] 0.362315

20°

Maximum mode index used to apply flat -> # 153
COMM MAX [m] 7.76792e-05
FORCE MAX [N] 0.337186

at each rip of the shell, the gap was checked: the "ear" has never been detected, i.e. the max gap wa 39um

at the end the telescope was moved back to zenith, the shell ripped and set again.

failure while ripping at 90° (see log). recover failure from AdOptControl
FASTDGN00 03:22:36.641452| FUNCTEMERGENCYST > CHCURRAVERAGE-0000 = -0.8
IDLCTRL00 |ALW| 9775|2010-04-01 03:22:36.569089| MAIN > EndCmd
IDLCTRL00 |ALW| 9776|2010-04-01 03:22:36.569215| MAIN > StartCmd

90°

COMM MAX [m] 7.75984e-05
FORCE MAX [N] 0.290929

same problem with astigm correction as before

Slew test

We set the shell while telescope is zenith pointing (shell already set) and move the telescope. No action will be done on the shell (unless required. telescope position and timing will be taken

slew performed 3 time (90-->30-->90) without problems

6:15UT ho_modes_offload disabled

skip frame, rip to recover

Maximum mode index used to apply flat -> # 421
COMM MAX [m] 7.76234e-05
FORCE MAX [N] 0.259889

same test (ho_offload_enabled) but moving the telescope at a lower speed, 0.25°/sec, while fast speed is 1.3°/sec

!!!!07:00UT adsecarb found off

last operation:

ADSECARB00 |ALW| 1329775|2010-04-01 06:52:44.568967

the same, last overcurrent threshold set is:

IDLCTRL00 |ALW| 22495|2010-04-01 06:47:21.869366| MAIN > Setting overcurrent protection for 30.00 [deg]

hence, the following movements were performed without updating the elevation:
6.53.51 start moving 0.25°/s speed -->90°
6.58.07 90
6.59.52 start moving 0.25°/s speed -->30°

Adsecarb restarted

end of test
Topic revision: r3 - 01 Apr 2010, RunaBriguglio
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki? Send feedback