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
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43 (44) equidistant bunches
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Need to do something for LHCb
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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
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Parameter list
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Circuits and currents
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Implications
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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
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Training to 7TeV
Circuits not commissioned in 2008
75ns and 25ns operation
ions