Operating the Target Changer

25.04.2002 / im

Changing the target during beamtime

• From macrobusy: login to pip, user piptof
• Change to the target directory:

> cd target
• > target recall

gives a list of the available targets
• > target recall [name]

moves the target called [name] into position.

Restarting after a power failure

The motor controller (VME module next to the Eltec E7) wil lose any position information
when the power is turned off. In that case, a reference drive must be performed:

• If there are any targets with wings on the target ladder: REMOVE THE TARGET LADDER !

Most likely, you will have to move the target table manually to do that.
This is only possible when the motor power supply is turned off.
• Login to pip, user piptof
• Change to the target directory:

> cd target
• give the command

> target initpos
This will move the target table to the lowest position and rotate it to the reference angle.
• Reattach the target ladder. A good position to do this is the "empty target" position:

> target recall empty
• Now you can select your favorite target (see above).

Installing and adjusting targets

After  installing a new target, you can move it into position with the following commands:

• target up [h]  moves the target  up by [h] mm.
• target down [h]  moves the target down by [h] mm.
• target lrot [phi]  rotates to the left by [phi] degrees.
• target rrot [phi]  rotates to the right by [phi] degrees.

If you try to move out of range (note: this also applies to angles below 0 degrees), a positioning failure
will be reported.

To view the absolute coordinates, do

target showpos

Direct movement to absolute coordinates is possible with

• target moveto [h] [phi]

Once you are happy with the target position, choose a meaningful name and save it:

• target saveas [name]

If the target list contains an item with the same name,  this item will be overwritten.
The target positions are stored in the file targets.dat. To remove a target from the list, type

• target remove [name]