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The AT-MAS Field Quality Observatory: Main Dipoles |
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This web site contains updated graphs of
field quality measured in the Large Hadron Collider Dipoles at the manufacturers,
global beam dynamics targets and finally warm-to-cold correlations as measured
at cold in CERN. Instructions: to reduce the probability of
activating IE and Excel bugs, please do not open files from your browser but save
them on your disk (on IE, place your mouse on the link, then right mouse and Save
target as ...). Then, please open them with the disabled
macro and no
update options. You need a NICE password to download the files.
For problems in file downloading please contact authors.
Collared coils and cold masses are identified by a
progressive number, whose correspondence
to the magnet name can be found in the Log file of the measurements and of the
holding point.
Excel files with magnetic measurements of each
collared coil or cold mass at room
temperature can be found in the
LHC main
dipole data repository. Measurements and post-processing of raw data are carried
out through instrumentation and personnel of the
AT-MTM-AS
section. Control limits based on beam dynamics are worked out using correlations to
magnetic measurements at 1.9 K carried out by
AT-MTM.
Some of the
Disclaimer: Please note that these measurements
are the result of the efforts and collaboration of many people. However these
results are not final. You can consult data, but before using them you are
kindly requested to ask permission from the authors.
Note! Click here if you need access
to the original documents in MS Word format 
The letter S
after the icon denotes a scatter plot, where individual data are shown together
with a running
average where all firms are mixed. This plot aims at showing data of every
magnet versus beam dynamics targets.
The letter
T after the icon denotes a trend plot, where moving
averages of 5 magnets are given, and each firm is treated separately. This plot
aims at showing trends in the production of each manufacturer.
The Collared Coil versus beam dynamics limits
Log
file of the measurements and of the holding point
Summary of systematic,
random and uncertainty
and
projected with nominal shims
Magnetic length, coil waviness and shims
S
T
Transfer function and
integrated transfer function
S
T
and projected with nominal shims
S
T
Normal field harmonics b2
S
T, b4
S
T b3, b5, b7
S
T
and projected with nominal shims
S
T
Skew field harmonics a2,a3,a4
S
T
The Cold Mass versus beam dynamics limits
Log
file of the measurements and of the holding point
Summary of systematic,
random and uncertainty
and
projected with nominal shims
Magnetic length and coil waviness
S
T
Transfer function and
integrated transfer function
S
T and
projected with nominal shims
S
T
Normal field harmonics b2
S
T, b4
S
T
b3, b5, b7
S
T and
projected with nominal shims
S
T
Skew field harmonics a2,a3,a4
S
T
Extrapolation of warm measurements to cold (1.9 K)
From collared coil to cold
From cold mass to cold
Correlations from collared coil to 1.9 K
Magnetic length, transfer
functions
Normal field harmonics b2,
b4
, b3, b5, b7
Skew field harmonics a2,a3,a4
Correlations from cold mass to 1.9 K
Magnetic length, transfer
functions
Normal field harmonics b2,
b4 , b3, b5, b7
Skew field harmonics a2,a3,a4
Field quality newsletter (collared coils)
2004
March-April
January-February
2003 November-December
September-October
July-August
May-June
March-April
January-February
2002
November-December
September-October
July-August
May-June
March-April
Photo: "The photojournalist Dennis Stock", by A. Feininger, 1951.
AT-MAS Logo by V. Frigo.