Introduction

The purpose of this document is to provide Jefferson Lab employees with

a standard system of unique names to represent specific pieces of equipment.

Up to nine alphanumeric characters are used to identify a particular

equipment, its system, and its location.  Nomenclature identification is

used on drawings, schematics, computer software, and other sources of

information. Nine characters or less is more efficient that a narrative

description, such as: the sixth cavity in the thirteenth cryomodule in the

South Linac.

Background

The Nomenclature Document was first published as part of CEBAF

Technical note 91-083 in October 1991.  Updated revisions were published

and distributed in December 1992 and 1993.  The document was converted to a

menu-driven computer data base in 1994, which provided a search capability.

The software was upgraded in March/April 1995 to include the capabilities to

print or browse through the entire document. 1n 1996, the nomenclature was

added to the JLAB web home page.  In 2013, the document was converted to

Excel and an equivalent PDF version. To access the nomenclature on the web, go

to the site index and select C.  Under C, look for CND (CEBAF Nomenclature

Document). Select that option.

Description

All names have a maximum of nine characters, and all letters are upper case;

i.e., capital letters.  For convenience in the nomenclature document, the

letters S V V X X Y Y Z Z are used to symbolize a nine-character name. The

meaning of these letters is as follows:

S    Technical System

VV   Component Type

XX   Sector or Subsystem

YY   Locator

ZZ   Element Number

A brief description of these five categories follows:

S --- Technical System:  A single letter is used to symbolize a major system

such as a C for cryogenics or M for magnets.  The Associate Directors for

Accelerator and Physics have final approval authority to add, change, or

subtract symbols for technical systems.

VV -- Component Type:  Two letters are used to symbolize component types

such as CV for check valve or WP for water pump.  All component types are

associated with a technical system, and every three-letter combination must

have a unique meaning.  We try to minimize the instances of more than one

meaning for the second and third characters, but there are a few exceptions.

The Nomenclature Administrator has final approval authority to add, change,

or subtract symbols for component types.

XX -- Sector or Subsystem:  Two characters, which can be a number or letter

in either position, are used to symbolize a location, a subsystem, or a

large piece of equipment.  For example, 1L is used for the North Linac, 29

is used for the vacuum system in the Cryogenic Test Facility, and 3E is used

for the third extractor. Sectors and subsystems are not tied to a particular

technical system.  Not all technical systms use the XX positions.  In which

case, the positions are left blank.  The Operations Manager has final

approval authority to add, change, or subtract symbols for sectors and

subsystems.

YY -- Locator:  Two numbers are used to symbolize a location within a

sector (XX), such as the sequential numbering of quadrupoles within a

sector.  All non-girdered components are numbered per the upstream quad.

Exceptions:  Dipoles are numbered sequentially within a sector.

Cryomodules match the 'zone' number (first module is #2

and the last is #26).  This number controls the upstream

components.

ZZ -- Element Number:  One or two letters or numbers are used to indicate

the actual number of name of a component.  The element number is tied to a

locator and a technical system. An example of the usage of element numbers

is using numbers 1 through 8 to indicate the cavities in a cryomodule. Using

H to indicate a horizontal configuration for a beam position monitor is

another example.  The Operations Manager has approval authority to add,

change, or subtract symbols for element numbers.

Example:  IDA2C04

This is an Insertable Beam Stop in Line B of the BSY between quad girders

04 & 05.  This is broken down as follows:

I       Instrumentation System

DA       Beam Stop, retractable

2C       Line 'B' - Beam Switchyard

04       Located down beam of the 4th Quad