Procedure for Displex startup and use

  1. Move the displex:

    If the displex is in the cage, then it has to be moved from there to the hutch.

    Take the experimental table and put it under the displex frame. Using four 4x4 wooden blocks we could raise the displex frame by lifting the table. This way you can move the table with the displex on it to the hutch. Remember, however, that the compressor also needs to be pulled with the displex frame. And, if the water pipes are connected to the water supply and return on the wall of the hutch, they need to be disconnected first.

    Next the Lakeshore temperature control unit and the vacuum meter have to be moved into the hutch, too.

  2. Make the connections:

    1. Connect the water pipes to the supply and return on the hutch wall;
    2. Connect the Lakeshore cable to the displex;
    3. Connect the vacuum cable;
    4. Connect the power cables for the temperature sensor; vacuum meter, and the compressor;
    5. Connect He supply to the heat exchange chamber;
    6. Connect N2 to the sample chamber;
    7. Connect vacuum lines from the rough to the displex;

  3. Startup:

    1. Turn on the scroll pump if it is not ON yet. Turn on the big black valve to pump down the displex and, at the same time, put the aluminum cover on the sample chamber door;
    2. Turn on the temperature controller;
    3. Turn on He gas supply and open all the related valves and meters;
    4. Turn on the temperature controller;
    5. Finally turn on the compressor.

  4. Watch:

    Vacuum should go below 10 mTorr in a couple of minutes;

    Temperature should go down to below 20 K(~ 13.5 K when stabilized) in less than an hour.

  5. If a certain temperature is desired, the controller should be used.

    Push the setpoint bottom and change the temperature to the desired value using the up/down bottoms. Push enter when ready. This should get it going.

  6. Changing sample:

    Turn off the black valve for pumping and turn on the nitrogen supply to the sample chamber; open the sample door and change the sample as quickly as possible to avoid temperature rising too much. Put the door back and turn on the valve again to start pumping.

 

Written by Shengke Wang