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  1. Introduction

The SLAC 125-981 Beam Containment System LION Power Supply Chassis is deployed to supply an isolated +250V to Long ION chambers deployed throughout the Beam Containment System. The commissioning of FACET has consumed the only operational spare, and printed circuit board design files critical to the fabrication of new spares have been lost. Additionally, the existing design relies on a number of outmoded design and construction practices.
The effort required to regenerate PCB files based on the existing design would be much better spent redesigning the chassis from the ground up. Such a redesign can be accomplished in roughly the same time frame, with better performance, reliability, and documentation.

    1. Purpose

This document shall define performance, form-factor, and interfacing requirements for a LION power supply chassis redesign. The intended audience includes the power supply chassis design engineer, Beam Containment system-level engineers, engineering managers, and both internal and external design reviewers.

    1. Scope

The BCS group will produce a new 250V DC power supply board and chassis for the BCS LION subsystem.

    1. Definitions, acronyms, and abbreviations
    2. References
      1. SD-125-981-00 R1, "BEAM CONTAINMENT SYSTEM LION POWER SUPPLY CHASSIS" electrical schematic
      2. Conversations with Brian Bennett regarding his wish list for a new LION power supply chassis
    3. Overview
  2. Overall Description
    1. <LION system description including integrator cards, tester chassis, terminators, bizarre current loop through cable shields and back plates. See IEEE 830-1998, section 5.2.1 for how to organize>
    2. Functions
      1. 250V supply
      2. Status
      3. Remote on-off
    3. User characteristics
      1. BCS Engineers, Technicians
      2. MCC Operators
    4. Constraints
      1. <3U or less>
      2. <existing input connectors>
      3. <existing output connectors>
    5. Apportioning of requirements

<What can fall on the floor?>

  1. Specific Reqirements
    1. <Supply voltage>
      1. Fusing
      2. Filtering
      3. Switch
    2. Output Characteristics
      1. <voltage, accuracy, residual ripple>
      2. <Isolated Outputs>
      3. <self-checking>
      4. <current limiting>
    3. Status and Diagnostic Interfaces
      1. <output trim adjustability as necessary>
      2. <DMM-friendly monitoring outputs, (front, or rear-mount?)>
      3. <connector with per-channel output status, (dry contacts?)>
    4. Control Interfaces
      1. <stick with bob's connector pinout>
    5. Reliability

<best effort unless we have a better way to specify and calculate>






  1. Revision History

    Rev No.

    Effective Date

    DCO No.

    01

    xx/xx/xx

     

     

     

     

     

     

     
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