5.3.3.16  Operating procedure

The MacA and MacB communicate by the Timbuktu package, which implements the TCP/IP protocols over an Ethernet dedicated line.

• switch on the MacB computer (energize the VME crate).
• run Timbuktu on the MacB: you can select it in the Apple (top-left) menu.
• open the connection selecting the CONTROL button after you entered the TCP/IP number (129.57.188.20).
• give the username H2OCEBAF and the password WATER.

The window that appears contains a `carbon copy' of the MacA screen: the user in counting room can control all the operations of MacA by using the MacB mouse and keyboard as if the MacB user were using the MacA; BE CAREFUL: the performance are reduced due to the connection: do not be in a hurry! wait for the screen to refresh after any action.

The system startup depends on the history of the shutdown

• go to the right side of the Right rack and push the green start button of the right box; you will hear a beeping sound;
• go to the front of the Left rack and push the green button near the emergency one;
• wait for the MacA to be operative;
• click on the H2O CEBAF97 icon (the slow control program for the water target at CEBAF), which is almost in the center of the MacA desktop. The LabView application will run automatically and the slow control main window will be shown;
• push the arrow button on the top-left side of this window in order to start the program.

  The first time the program is ran, after MacA power on, it initializes the electronic modules. Every time the program is ran, it asks for a new initialization of the electronic modules. Answer YES, a small window with 4 buttons appears. Press all the buttons in order from top to bottom. When the initialization is done the main window come back.

• Recognize the cause of the emergency, and fix it.
• Turn the emergency button in order to restore its operation. The system will be energized and a beeping sound will be heard.
• Push the green button near the emergency red button. The beeping sound will be turned off.

• go to the experimental hall;
• close the program on the MacA; shutdown the MacA;
• move to the right side of the Right rack and push the red stop button of the right box (the left box is not used).

• check that the slow control program is running on MacA and optionally on MacB;
• check if the pump is on, and in case turn it on from the switch in front of Right Rack or from the switch in front of "Pump Command Module" in Counting Room
• increase the pump speed to about 4/5 of the scale by moving the slide (pump speed) in the main window of MacA or MacB (right side);
• wait about 20 minutes to stabilize the water flow, then adjust the pump speed to the wanted working value.

• press the motor button on the bottom of the main window of the computer; a motor control window will appear
• select the type of movement (up/down, rotation);
• select the target or the angle; the move button should be activated if everything is O.K.;
• press the Move button; a warning message remind you to be sure of your action. Be sure that the beam is off!!
• during the movement watch the two displays showing the current position and the one to be reached.
• when the final point is reached, a message will inform you of the success of the operation. Otherwise a warning message will tell you about the faulty status.

The gas filling of the target cell, when empty, has to be done in Hall A: on the right rack there is a self-eplaining panel. The washing button has to be pushed (for about 15 minutes) to open the inlet and outlet valves in order to allow the gas to replace the air which fills the target cell.

In order to refill the cell, in the case of very small leakages (remember that the pressure must be about 1.02 Atm), push the pressure bottom part of the main window. The pressure control window will appear. The operation is self-explaining. Just remember that the gas flows only if you keep the button pressed.

The corrispondence between the targets and the encoders is as follow:

The vertical scale factor is: 1 encoder unit = 5.74 $\mu m$

The angular correspondence is:

that means: 1 encoder unit = 0.035 degree

When a new calibration is required only an expert person must perform the following steps:

• go to the Hall A;
• run the calibration program ("setlimits.vi") on MacA in order to allow the computer to get the limits of the movement ranges (up/down and rotation); this procedure takes several minutes;
• rotate the target to two angles and take note of the encoder values
• write these value on a scrapbook
• select sequentially the 6 targets (waterfall and the solid ones) and take note of the encoders values;
• write them in the table ....
• note ALL the previous values on the logbook.
• move