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Beam Impact Dsitrubtions On Collimators For Shower Studies
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This site contains links to the beam impact distributions on the LHC collimation system for various operation
scenarios. This includes different optics settings (450: GeV injection, 7TeV: early collission, nominal collission)
and configurations of the LHC collimation system (opening and number of collimators used). The following sections
will describe the availabel optics, the composition of the input files and last section will give a link to files.
| optics name |
energy |
IP1 |
IP2 |
IP5 |
IP8 |
|
[GeV] |
crossing/seperation |
cross./sep. |
cross./sep. |
cross./sep. |
| inj.450 |
450 |
on/on |
on/on |
on/on |
on/on |
| lowb.coll |
7000 |
on/off |
on/off |
on/off |
on/off |
| lowb.coll_all |
7000 |
on/off |
on/off |
on/off |
on/off |
| lowb.ecoll |
7000 |
on/off |
on/off |
on/off |
on/off |
| lowb.all |
7000 |
on/off |
on/off |
on/off |
on/off |
| lowb.rlc |
7000 |
on/off |
on/on |
on/off |
on/off |
| optics name |
energy |
IP1 |
IP2 |
IP5 |
IP8 |
ALICE |
LHCB |
|
[GeV] |
ß* [m] |
ß* [m] |
ß* [m] |
ß* [m] |
spectrometer |
spectrometer |
| inj.450 |
450 |
17.0 |
10.0 |
17.0 |
10.0 |
off |
off |
| lowb.coll |
700 |
0.55 |
10.0 |
0.55 |
10.0 |
off |
off |
| lowb.coll_all |
700 |
0.55 |
10.0 |
0.55 |
10.0 |
on |
on |
| lowb.all |
700 |
0.55 |
0.50 |
0.55 |
1.0 |
on |
on |
| lowb.ecoll |
700 |
2.0 |
10.0 |
2.0 |
2.0 |
on |
on |
| lowb.rlc |
700 |
0.55 |
10.0 |
0.55 |
2.0 |
on |
off |
The files containing the impact distribution on the elements (collimators) may not include header
explaining the contents of the columns. Therefore the table below explains composition of the file
and the meaning.
| collimator ID name |
rotation [radiant] |
s-position |
x-position |
xp |
y-postion |
yp |
interaction type(*) |
particle ID |
turn |
| 58 |
0 |
0.155147 |
-7.62721 |
-0.030752 |
0.0400282 |
0.0329704 |
1 |
5039 |
13 |
| 58 |
0 |
0.101235 |
-7.56941 |
-0.0150631 |
0.0942428 |
0.00245703 |
1 |
634 |
27 |
| 58 |
0 |
0.055993 |
-7.79939 |
-0.0216831 |
-0.33547 |
0.00101564 |
1 |
736 |
8 |
| 58 |
0 |
0.039045 |
-7.63263 |
-0.00609148 |
-0.314906 |
-0.00926711 |
1 |
304 |
72 |
The collimator ID is a unique number (within all colliators according to the same beam) for a collimator,
e.g. the collimator 58 is the TCTH.4L5.B1, which is horizontal tertiary collimator. The real name of the
collimator is normally contained in the filename. The roatation is given in radiants for the above example
the collimator is a horizntal and therefore the roataion is zero (e.g. a vertical is rotated by Pi/2 = 1.57).
The rotation is done clockwise according to the coordinate system of the beam. The s-position is given in
meters from the starting point of the collimator jaw, the x- and y-position is given in milimeters from the
origin of the coordinate system (this means that the opening of the collimator is not
subtracted). The interaction types are summarized in the table below, the particle ID is the number asinged to
the particle by SixTrack to keep track of the particle and the turn stated the number of turns done in
the accelerator by particle before it interacted.
| # (*) |
interaction type |
| 1 |
particle absorbed |
| 2 |
nuclear elastic scattering |
| 3 |
pp elastic scattering |
| 4 |
single diffractive scattering |
| 5 |
Coulomb scattering |
The picture above shows the definition of the refrence frames used for each beam. Beam1 goes clockwise and beam 2
counter-clockwise. The azimuthal angle defining the rotation of an element (collimator) starts from the positive
x-axis and is measured clockwise in the x-y plane.
Th. Weiler, AB/ABP-LOC,
16 August 2006
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