TRISPEC Current Status
Present Status (Configuration for UKIRT 01A at February
The new pupil stop for the optical channel was installed at
the end of January 2001. This stop was figured to match the misalignment
of instrument's internal optics, and allowed us to adjust the positions
of the three pupil stops to suitable positions simultaneously. Finaly,
although a small misadjustment only on the IR1 channel remains, the positions
of three pupil stops were almost adjusted to suitable positions simultaneously.
Therefore, we could take reasonable dome flats on the optical channel as
well as the infrared channels. The pupil images by the secondary mirror
after the adjustment of the insturment's optical axis to the telescope
at the 9th of Feburary are here.
Wavelength Calibration Unit Controller
The controller of the wavelength calibration unit (WCU) was
replaced to the new controller with a mechanical relay for switching the
arc lamp. This allowed us to automate the whole procedure for obtaining
the wavelength calibartion data.
Furture Configuration for UKIRT
Focal Length Converter (F36 to F18)
We are plannig to introduce the focal length converter for
F36 to F18, in order to reduce image sizes on the array. Then the pixel
scales would be just twice, specifically, 0.22"/pixel for the optical channel,
0.44"/pixel for both the infrared channels. This would increase an S/N
ratio for any integration time by a factor of 2. And this would allow us
to use a half width slit for point source, then the spectral resolution
would increase by a factor of 2. The converter would be placed in the front
of the window of TRISPEC. However, due to delay in design, we don't still
make it in time. Also we except that finding a guide star can be more difficult
because the field of view will expand by a factor of 2.
Past Configuration (for UKIRT 00B at August 2000)
Second Dichroic Mirror
The second dichroic mirror for dividing into IR1 and IR2 channels was
replaced to one with the smaller ripples on the region of 0.9 to 1.2 microns
at the 14th August 2000.
The pupil stops for the infrared channels were replaced to the new
stops with flexibility for placed positions at the end of July 2000. The
pupil stop for the optical channel was also installed on the second wheel
of the optical channel at the same time. The sizes of stops are 7.90mm
for optical , 6.75mm for IR1, 6.80mm for IR2, and are a littile smaller
than those at Feburary 2000. However, due to the misalignment of instrument's
internal optics, we weren't able to adjust the positions of three channels
to suitable positions simultaneously. Then only two stops for infrared
were adjusted for infrared channels, and the stop for optical wasn't used
during this run. The pupil images after final adjustment at the laboratory
on pupil imaging mode (see next) are here.
And the images by the secondary mirror after the adjustment of the insturment's
optical axis to the telescope at the 23th of August are here.
Pupil Imaging Mode
For maintenance, the new mode what takes a pupil image, was installed
at the end of July 2000. This mode will be used for adjustment of the instument's
optical axis to telescope, and for sevral tests for the instument's internal
Adjustable Mounting Bracket
The new mounting bracket with adjustable trusses, similar to those
used with CGS4, was installed. Using the pupil imaging mode together, we
were easily able to get rid of the misalgnment problem experienced
in February 2000, and we were able to adjust the alignment of the instrument's
optical axis to telescope under dome light during daytime almost completely.
Operation of Telescope and IRPOL2
The software for operation of telescope and IRPOL2 on our computer
was developed. These allowed us to automate some observing procedure, such
as taking exposures with rotating waveplate, and to record sevral status
values as object name, telescope positions, waveplate position, and so
on. Although some bugs were found at first few nights, all of these were
fixed during first few nights.
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Last Modification Date: 2001/02/13
Last Modification Author: Makoto