Load Lock Gun Meeting

December 14, 2004

Attending: Phil Adderley, Joe Grames, Danny Machie, Matt Poelker

-   Danny reported that the preparation chamber has been received from
    Kurt Lesker. Phil wants to clean with hot water, purge with N2 and
    then leak check the chamber. \[After meeting, Phil reported pumpdown
    to 300 mA ion pump current in 1 hour following the hot water
    cleaning.\]

-   Phil reported that Jim cleaned the flanges of the 2^nd^ high voltage
    chamber yesterday. Phil reported that Ralph cleaned chamber in
    chemical lab. Once complete it will be electropolished, then vacuum
    fired. The flanges will also be vacuum fired.

-   Phil noted that we should use vacuum melt stainless steel for the
    electrodes so that polishing does not reveal hidden defects. He said
    that we have 2 proud anodes and will need a 2^nd^ "tee"-electrode
    assembly for the 2^nd^ gun.

-   Phil reported that we have on 4.5" all metal valve and need one
    2.75" all metal valve. Phil subsequently corresponded,

> "Hello Danny, we ordered the wrong compliment of Vat valves. I have in
> my possession an All metal 2.75\" Flanged / 1.5\" bore valve for the
> new Load lock prep to H.V.  We need 2@  2.5\" bore / 4.5\" flanged
> manual valves for the new load lock Gun. One for the suitcase and one
> for the Prep chamber. Can we get procurement to edit the Req / and
> P.O. ?? If not we will need to order another 2.5\" bore All metal
> valve for the suitcase. Thanks. Phil."

-   Danny reported that the manipulators are due on Dec. 23^rd^.

-   Danny reported that the springs for the stalk heater are not done.
    The original material we delivered for fabrication was not
    sufficient, so we sent different material.

-   Danny suggested that we need a new gun table. Following discussion
    we decide that we can modify that table in the EEL lab that
    presently supports the 1^st^ high voltage chamber.

-   Danny reported that the 2^nd^ activation chamber is due Jan. 7^th^.

-   Danny reported that the bellows for the manipulators are due next
    week. All except one passed leak checking and the remaining bellows
    is being remade.

-   We discussed the spring on the rotational manipulator. The spring
    was damaged in BTLLPEG because it conflicted with the copper
    fingers. After Phil repaired the spring in BTLLPEG, and since we are
    careful not to press the copper fingers against the spring, the
    spring has worked. We all decided it is important to test the
    originally chosen spring method further before pursuing a different
    method.

-   We discussed the rotation of the puck in the high voltage electrode.
    Danny will think about a puck with a flat or notched surface. He
    suggested we can test ideas with an stainless puck, rather than with
    a costly moly puck.

-   We discussed the suitcase design. We considered the following:

    -   A baked docking chamber will be attached to the preparation
        chamber by a 4.5" all metal valve.

    -   The baked docking chamber will have a bellows on the chamber
        side of the valve for alignment.

    -   The baked docking chamber will have an ion pump with a turbo
        pump-out port.

    -   When not in use the opposing side of the docking chamber will
        hae a 4.5" blank.

    -   The suitcase chamber will have a 4.5" all metal valve which
        would connect to the docking chamber at the blank location.

    -   The suitcase chamber will have a manipulator which can suitable
        reach the center of the preparation chamber.

    -   The suitcase chamber will have a means protecting the
        manipulator such that it cannot be bend.

    -   The suitcase chamber will have handles so that two people may
        easily move it.

    -   The suitcase manipulator will have a puck carrier suitable for
        four pucks, such that the pucks do not readily fall out of the
        carrier. Danny will consider a suitable carrier. Joe proposed
        the idea of a "deep" puck carrier.

    -   A baked load chamber will exist permanently in the EEL lab.

    -   The load chamber will have a window on one end and the opposing
        will have a 4.5" blank.

    -   The suitcase 4.5" all-metal valve will mate to the load chamber
        at the location of the blank.

    -   The load chamber will have an RGA and ion pump with a turbo
        pump-out port.

    -   The load chamber will have a support to transfer 4 pucks to the
        suitcase and 4 pucks from the suitcase without venting the
        chambers.

    -   The support will ideally provide heating to four pucks
        simultaneously.

        -   We discussed how to locate the puck, specifically the face
            of the photocathode, into the cathode electrode. No solution
            was reached.