Changing Slits, Filters, and Grisms

The page below describes how to changing the slits, the filters, the grisms, and other components on the wheels in the instrument, and describes how to control the wheels directly. And please note that the details given below are subject to change at any time.

Changing the Focal Plane Masks and Slits

To change the focal plane masks and slits, type on demi or on trispec as follows.
% sl <slit_name>
The following value are currently available as slit_name.
l600   -   Long 600µm slit
l450   -   Long 450µm slit
l300   -   Long 300µm slit
s600   -   Short 600µm slit
s450   -   Short 450µm slit
s300   -   Short 300µm slit
polmask   -   Polarimetry mask
black   -   Close
none   -   Open
If a requested slit isn't installed in dawer, the command will fail rightly. Before run this command, please check if the slit is actually available at your run. For changing observation mode, please use the obsmode command.

Changing the Filters

To change the filters, type on demi or on trispec as follows.
% fl <filter_name> ...
The following value are currently available as filter_name.
b   -   B bandpass filter on the optical channel
v   -   V bandpass filter on the optical channel
r   -   R bandpass filter on the optical channel
i   -   I bandpass filter on the optical channel
j   -   J bandpass filter on the IR1 channel
h   -   H bandpass filter on the IR1 channel
k   -   K bandpass filter on the IR2 channel
ks   -   Ks bandpass filter on the IR2 channel
lp   -   L' bandpass filter on the IR2 channel
3.3u   -   3.3µm narrow bandpass filter on the IR2 channel
3.7u   -   3.7µm narrow bandpass filter on the IR2 channel
gg455   -   GG455 long wavelength pass filter on the optical channel
gg495   -   GG455 long wavelength pass filter on the optical channel
950fh90   -   950FH950 long wavelength pass filter on the IR1 channel
ge   -   Germanium filter on the IR2 channel
lwp-br   -   Long wavelength pass filter on the optical channel (alias GG495)
lwp-jh   -   Long wavelength pass filter on the IR1 channel (alias 950FH90)
lwp-kl   -   Long wavelength pass filter on the IR2 channel (alias Ge)
lwp-all   -   Long wavelength pass filters on all channels
black-br   -   Close the optical channel
black-jh   -   Close the IR1 channel
black-kl   -   Close the IR2 channel
black-all   -   Close all channels
none-br   -   No filter on the optical channel
none-jh   -   No filter on the IR1 channel
none-kl   -   No filter on the IR2 channel
none-all   -   No filters on all channels
The command accepts plural filter names at once, then the command will set that in sequence.

Inserting and Deserting the Grisms

To insert or desert the grisms, type on demi or on trispec as follows.
% gr <grism_name>
The following value are currently available as grism_name.
vr   -   Low dispersion grism with grooves of 200 l/mm on the optical channel
jh   -   Low dispersion grism with grooves of 120 l/mm on the IR1 channel
k   -   Medium dispersion grism with grooves of 150 l/mm on the IR2 channel
all   -   Insert grisms on all channels
none-br   -   No grism on the optical channel
none-jh   -   No grism on the IR1 channel
none-kl   -   No grism on the IR2 channel
none-all   -   No grisms on all channels
For changing observation mode, please use the obsmode command.

Inserting and Deserting the Wollaston Prisms

To insert or desert the Wollaston prisms, type on demi or on trispec as follows.
% wo <prism_name>
The following value are currently available as prism_name.
vr   -   Wollaston prism on the optical channel
jh   -   Wollaston prism on the IR1 channel
kl   -   Wollaston prism on the IR2 channel
all   -   Insert Wollaston prisms on all channels
none-br   -   No prism on the optical channel
none-jh   -   No prism on the IR1 channel
none-kl   -   No prism on the IR2 channel
none-all   -   No prisms on all channels
For changing observation mode, please use the obsmode command.

Inserting and Deserting the Pupil Imaging Lenses

To insert or desert the pupil imaging lenses, type on demi or on trispec as follows.
% pl <lens_name>
The following value are currently available as lens_name.
vr   -   Pupil imaging lens on the optical channel
jh   -   Pupil imaging lens on the IR1 channel
kl   -   Pupil imaging lens on the IR2 channel
all   -   Insert pupil imaging lenses on all channel
none-br   -   No lens on the optical channel
none-jh   -   No lens on the IR1 channel
none-kl   -   No lens on the IR2 channel
none-all   -   No lenes on all channels
For changing observation mode, please use the obsmode command.

How to Control the Wheels Directly

To control the wheels directly, type on demi or on trispec as follows.
% wh <wheel_number> <wheel_control_command> [<argument> ...]
The following value are currently available as wheel_number.
1   -   Slit/mask wheel
2   -   First filter wheel on the optical channel
3   -   Pupil stop wheel on the optical channel
4   -   Second filter wheel on the optical channel
5   -   Third filter wheel on the optical channel
6   -   Grism wheel on the optical channel
7   -   First filter wheel on the IR1 channel
8   -   Second filter wheel on the IR1 channel
9   -   Grism wheel on the IR1 channel
10   -   First filter wheel on the IR2 channel
11   -   Second filter wheel on the IR2 channel
12   -   Grism wheel on the IR2 channel
sl   -   Slit/mask wheel (alias 1)
br   -   All wheels (five wheels) on the optical channels
jh   -   All wheels (three wheels) on the IR1 channels
kl   -   All wheels (three wheels) on the IR2 channels
fl   -   All filter wheels on all channels
gr   -   All grism wheels on all channels
all   -   Slit/mask wheel and all wheels on all channels
And, the following commands are currently available as wheel_control_command.
  • param   -   Set control parameters for the motor for the wheel.
  • rst   -   Move until turn on a zero point switch, then the position is set to zero.
  • mz   -   Move until turn on a zero point switch, the position is not reset.
  • mv   -   Move by requested step. (24000 steps is correspond to a 360 degrees rotation. the command accepts -12000 to 12000 as step.)
  • set   -   Move to requested position. (the command accepts 0 to 23999 as position.)
  • slot   -   Move to the position correspond to requested slot number or slot name
  • pos   -   Show current position of the wheel.
  • init   -   Move to the initial position of the wheel.
  • sh   -   Move twice by requested step after requested wait times.
  • For several wheel control commands mv, set, and slot,  the command accepts the following omited usage as well.
    % wh <wheel_number> {[+|-]<number> | <slot_name>}
    If you add a plus or minus sign to a number, the number will be interpret as the step number for the control command mv. If you do not, it will be interpret as the position number for the control command set. Also, if you type a slot name (such as 'S600' and  'V'), the wh command accepts it as the argument for control command slot.

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    Last Modification Date: 2001/02/18
    Last Modification Author: Makoto Watanabe <watanabe@z.phys.nagoya-u.ac.jp>