• Always remember to close the shutter at the end of the night or when you have finished using Michelle.
• Close the shutter immediately if the outside humidity is 80% or higher.
• Disable the array at the end of the night or when you are finished using Michelle.
• If the chop throw changes, you must click the fast guider button to resize the draw window.
• After slewing, don't turn on guiding until the telescope is in chop beam A.
  

Summary of instructions

• Type "michelleMenu &" on Hokulea
• Select "mich_oper screen"
• Enable the array from the mich_oper DM screen
• Select "WFG serial console (only)" from the michelleMenu screen
• Select "CCS serial console" from the mich_oper DM screen
• When running down, disable the array and close the shutter from the mich_oper DM screen

Running the relevant DM screens

Log onto Ohi or Hokulea as observer and type "michelleMenu&". This will bring up the following window:

Figure 1. The michelleMenu screen from which all relevant Michelle related windows can be launched.

In theory, there is only one DM screen you need to run in order to observe successfully with Michelle. However, we will describe a few others in case they are needed for troubleshooting. At the very minimum, you will need to run the mich_oper.dl screen which is launched by hitting the "mich_oper screen" button in the above menu. The following will launch:

Figure 2. The mich_oper Epics window. This is the only window you need to run when observing with Michelle, although for monitoring purposes you may wish to run further screens. Note that the Channel A and B temperatures in this case were being monitored while the instrument was at room temperature. When cold and with the array enabled, they would normally be at around 6.5K and 10.5K respectively.

Enabling the array: At the beginning of the night, or when Michelle is about to be used for the first time, you must enable the array using the "Enable" button. The array control state will turn green from yellow, and the channel A & B temperatures will rise. Remember to disable the array at the end of the night or when you have finished using Michelle.

Closing the shutter: The Michelle shutter, situated in the warm calibration unit, is essential for the safety of the KBr window since it's hygroscopic. Although the shutter will open automatically when you run the first Michelle sequence, you must remember to shut the window when you have finished using Michelle, if the outside humidity reaches 80%, or at the end of the night. To do this, simply click on the "flat/cover" button and then hit "START".

Although the above describes the bare minimum needed to run Michelle, it is recommended that you also run the STATUS screen (see section 2) and that you also run the WFG and CCS serial consoles (see section 3).

Other useful DM screens

Figure 3. The CCS status display.

Figure 4.  The cryostat control system DM screen.

After a reboot of the CCS, you can force the mechanisms to find datum by simply hitting the "apply" button. Each mechanism comes back with pre-determined settings after a reboot and this button simply sends a request to each mechanism to move to those settings. Since the mechanisms lose their reference position after a reboot, they are automatically forced to re-find their datum positions before moving to the desired setting. In normal operations, the mechanism will probably not move if you hit this button since each mechanism will probably already be at the correct setting.

NB. If the CCS has been rebooted, sending and executing a Michelle sequence in the OCS software will also result in the mechanism finding datum.

If, for some reason, you need to move an individual mechanism, say, for troubleshooting purposes, hold down the right hand mouse button over the relevant button and select the option you want. In most cases, this will be the first menu item, but buttons such as the detector and imaging buttons also give you a choice of two separate motors, For the detector these are the detector focus and translation, and for imaging this is the injector and extractor. As an example of what can be done, we'll look at the grating DM screen.

Figure 5. The grating DM screen

NB. Before moving any mechanism using the individual mechanism DM screens, you should contact Tom Kerr for assistance.

The top third of the screen simply displays the current settings, the bottom two thirds is where the action takes place. Most buttons and fields are probably obvious. The set wavelength buttons allow you to specify whether you are entering a wavelength or a mechanism step position. The datum search buttons will either force the mechanism to find datum ("force") or allow the software to use its intelligence and decide whether the mechanism needs to find datum or not ("discretionary"). In just about every case, discretionary should be selected. The order selection buttons specify whether the software determines the grating order (automatic) or whether the user will specify it.

The grating can be selected using the 5 buttons on the left, with the wavelength (or step position) being entered in the brown field in the middle of the display and the order (if necessary) being specified on the right. Note that zero order cannot be selected and that a step position has to be entered manually for this. For the LowN grating, zero order is found at 4572 steps.

Power is automatically applied to the motors when the START button is clicked and the wl_power and drum power buttons will toggle. Note that you must hit the start button in order to move the gratings to the desired setting, they will simply sit at their original position if you do not.

Emergency stop: There have been occasions with other instruments that an observations is accidentally started with so many coadds that the integration will take several minutes, or even hours, to stop. Hitting the stop asap button in the sequence console doesn't help, as the exposure will only stop after the set number of coadds have been done. The same is true for Michelle, although it is very unlikely such an observation will be created in the first place.

In case you do need to abort an observation in an emergency, you can do this via the Edict DM screen available by holding down the right hand mouse button on the "other displays" field in the mich_oper screen, and selecting "Edict".

Figure 6. The Edict DM screen. The abort button is immediately below the observe button.

The Edict and CCS serial consoles

Figure 7. The CCS serial console.

Figure 8. The Waveform Generator (WFG) serial console

In normal operations, both consoles will display logging information and software settings relevant to both the CCS and Edict systems, therefore if there is a problem of which the cause is not clear, you should glance at these consoles to see if an error message is displayed. Occasionally, you may also need to open all the edict serial consoles while troubleshooting to see if any errors are being reported by the slaves. These can be launched using the "All Edict serial consoles" button on the michelleMenu display.

If systems need to be rebooted via software, you can do this via the serial consoles. Simply type "reboot" in either the WFG or CCS serial console. Remember - rebooting in the WFG serial console will reboot Edict only, and rebooting in the CCS serial console will reboot the CCS only.

Please be sure to close all the serial consoles when you are finished with Michelle.

Target acquisition and peakup

Instructions: