Introduction |
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The purpose of this document
is to provide Jefferson Lab employees with |
a standard system of unique
names to represent specific pieces of equipment. |
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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. |
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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. |
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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 |
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