######## EE S[upport]{.smallcaps}

##### 19.d. [Background]{.underline}

##### The EE Support Department is responsible for the control, maintenance, operation of and improvement to, the Main Injector and Tevatron main magnet power supplies (with their associated 13.8 KV transformers and switch gear), and individual magnet load power supplies for various beam abort and transfer lines. It also maintains the correction element power supplies for Main Injector, Recycler, and Tevatron rings, the Tevatron regulation system, the Main Injector regulation system, Tevatron quench-detection/protection systems, Booster GMPS voltage regulation, and NTF bend magnet power supplies. In addition, this department is responsible for most of the accelerator's kicker power-supply systems and the electronics for the vacuum systems for both machines. The Department performs electrical disconnections in conjunction with Main Injector quad magnet replacements, helps maintain the integrity of Tevatron bus joints, and provides additional technical and engineering support for NTF. The Department is also responsible for the operation, maintenance and modifications for all beam-line power supplies. The regular yearly preventive maintenance activities performed on all these systems include replacing old water hoses, cleaning air filters, diagnostic testing of transformer oil, cleaning and testing of switchgear, calibrating the quench protection electronics, and replacing aging linear power supplies and/or electrolytic filter capacitors. The Department supports a Drafting/Design group that provides electrical drafting, PC layout and board prototyping services for the entire division. 

##### 19.f. [Accomplishments in FY04]{.underline}

Besides the normal maintenance activities, the following projects are
completed or expect to be completed; the replacement of old quench
protection voltage-to-frequency lead monitoring cards (80 cards), the
installation of transient recorders for Tevatron 1 kamp lowbeta power
supplies to help diagnose intermittent trips, continuation of the effort
started in FY03 of replacing charging power supplies in the Tevatron
abort kickers with newer, more reliable ones, and the installation of
improved monitoring and diagnostics for the 275 Tevatron dipole
corrector power supplies.

Also planned is to install a newly designed prototype solid-state dump
switch and controls in the Tevatron quench protection system. The
existing system requires frequent maintenance and problems are difficult
to diagnose. This effort was delayed from FY03 to FY04 because of
limited resources.

As part of an on-going effort to replace aging power supplies in the
beamlines, EE Support replaced twenty 30 year-old power supplies with
new modern switch-mode units and has started a program of rebuilding the
older LING 55kW power supplies.

Planning for BTeV and the modifications to the C0 interaction region
have started. These plans deal with issues of power-supplies,
quench-protection and controls.

##### 

**19.g.1. [Accomplishments Expected in FY05]{.underline}**

Assuming the TEV dump switch replacement prototype is successful, a
program to replace all 12 dump switches and controls will be
implemented. The replacement of 30 year-old magnet power supplies with
newer ones will continue as resources permit as will the rebuilding
program for the LING 55 kW power supplies. Attention will be paid to any
power supply reliability problems associated with collider operation and
fixes will be implemented.

Planning and design work for the modifications to the C0 interaction
region will be a significant effort.

**19.g.2. [Future Accomplishments Expected in FY06 and
Beyond]{.underline}**

The program of replacing aging power supplies will continue, as
resources permit, and collider operation will be monitored for potential
improvements in reliability. The Tevatron dump switches will be replaced
as resources allow. The first set of modifications for the C0
interaction region will be installed and commissioned.

########