Comments for Review of NuMI Horn power supply

                            Aug  13, 2001

                    from  Robert Trendler
                        ------------------------


 1. Overall Remarks
 The review was on target for the power supply, but too soon for the
 transmission line.

 The power supply is well designed and will meet the system requirements. Ken
 Bourkland and his colleagues are to be congratulated. Continued testing
 should shake out any anomalies, e.g. the capacitor connection failures
 described by Ken.

 It was clear from the discussion that work on the transmission line is at an
 early stage. However, important design decisions have been made and tested
 in the prototype installation. It appears that the design is on track and
 when complete will meet requirements.

 2. Itemized suggestions, questions and concerns

 (1) While it appears that the transmission line design effort is only now
 fully underway, the design effort appears too fragmented. Overall design
 coordination is important to ensure that the whole design team is working
 with the same design criteria and with tools that each can utilize.


 (2) It is critical to ensure that the ultimate goal of being able to replace a
 horn is not lost in the details of the transmission line design specifics;
 flexible connection, quick disconnects, etc. As brought out at the review,
 the connection and disconnection for the replacement of a horn, while not
 yet addressed in detail, is likely to be a difficult process requiring great
 care to accomplish. It is important that all component designs address this
 issue.

 (3) Prototype testing of the connections (quick disconnect) should be done.
 Alignment of connector may be difficult to accomplish in the final
 configuration.