LEP startup 1996
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Transcript LEP startup 1996
Schedule for cool down (March 2008)
Strategy for 2008 2009
A
2008
Hardware commissioning
Machine
checkout
To 5TeV
No beam
2009
Train to
7TeV
No beam
Beam
Setup
5TeV
43 bunch
operation
Train to
7TeV
Beam
B
Machine
checkout
Beam
commissioning
C
75ns ops
25ns ops I
Beam
Shutdown
Stage A physics running for ALICE and LHCb
43 (44) equidistant bunches
Need to do something for LHCb
Previously thought to displace bunches in one beam (asym)
Can do better (symmetrically displace bunches in both beams)
Allows to adjust luminosity sharing between 2 and 8 while keeping
maximum number of collisions in 1 and 5
Parameters for 5TeV run
Target machine parameters - Stage I - 43 bunch operation
Set parameters
Unit
Injection
Collision
Crossing angle 1 & 5
μrad
0
0
Crossing angle 2
μrad
0
0
Crossing angle 8 (+/- spectrometer polarity)
μrad
0
0
Separation 1 & 5
mm
5
5
Transverse IP shift (crossing plane)
mm
0
0
Separation 2
mm
4
4
Transverse IP shift (crossing plane)
mm
0
0
Separation 8
mm
4
4
Transverse IP shift (crossing plane)
mm
0
0
Beta * 1 & 5
m
11
2
Beta * 2
m
10
10
Beta * 8
m
10
6
Energy
TeV
0.450
5
Number of bunches
43
4×1010
Bunch intensity
Longitudinal emittance
eV.s
Normalised transverse emittance
μm.rad
< 1.0
2.5
3.5
3.75
Parameters for 5TeV run
Derived parameters
Unit
Injection
1.72×1012
Protons per beam
Current per beam
mA
Stored energy per beam
MJ
Relativistic Gamma
3.1
0.12
480
Bunch length
cm
11.24
Beam size 1 & 5
μm
283
Beam size 2 & 8
μm
270
F
Peak luminosity 1 & 5
Events per crossing 1 & 5 (60 mbarn)
Collision
cm-2 s-1
-
1
TBSO
Parameter list
Circuits and currents
Implications
What is needed, what is not
What do we do about magnets at zero field
Experiment magnets will be at 7TeV field
Collimators
Getting ready for 2009
Training to 7TeV
Circuits not commissioned in 2008
75ns and 25ns operation
ions