Luminosity and PU conditions during the intensity ramp up in 2022
| |
Luminosity and PU conditions during the intensity ramp up in 2022 |
|
The parameters on this page reflect the current best guess of the machine conditions and will be regularly updated. Please consider this when using these parameters for any estimate. In case of doubts do not hesitate to ask the LPC.
We project the instantaneous luminosity (in units of cm-2s-1) and pile up to be expected during the intensity ramp up of the LHC in the following tables, with varying assumptions on β* and beam emittance (based on the LHC beam parameters archieved in early July 2022).
The numbers below assume a bunch intensity of 1.2 x 1011 ppb (protons per bunch).
The situation at the beginning of the fill (β* = 60 cm) would be the following:
| β* = 60 cm |
|---|
| Emittance \ #bunches | 3b | 12b | 75b | 300b | 600b | 900b | 1200b | 1500b |
|---|---|---|---|---|---|---|---|---|
| ε=1.8 μm | L =1.1 x 1031 PU = 40 |
L =4.5 x 1031 PU = 40 |
L =3.5 x 1032 PU = 40 |
L =1.8 x 1033 PU = 40 |
L =3.3 x 1033 PU = 40 |
L =5.5 x 1033 PU = 40 |
L =6.8 x 1033 PU = 40 |
L =8.6 x 1033 PU = 40 |
| ε=2.1 μm | L =1031 PU = 36 |
L =4 x 1031 PU = 36 |
L =3.1 x 1032 PU = 36 |
L =1.6 x 1033 PU = 36 |
L =3 x 1033 PU = 36 |
L =4.9 x 1033 PU = 36 |
L =6 x 1033 PU = 36 |
L =7.7 x 1033 PU = 36 |
| ε=2.3 μm | L =0.9 x 1031 PU = 33 |
L =3.7 x 1031 PU = 33 |
L =2.9 x 1032 PU = 33 |
L =1.5 x 1033 PU = 33 |
L =2.7 x 1033 PU = 33 |
L =4.6 x 1033 PU = 33 |
L =5.7 x 1033 PU = 33 |
L =7.2 x 1033 PU = 33 |
Assuming fast leveling to β* = 45 cm, one would get the following:
| β* = 45 cm |
|---|
| Emittance \ #bunches | 3b | 12b | 75b | 300b | 600b | 900b | 1200b | 1500b |
|---|---|---|---|---|---|---|---|---|
| ε=1.8 μm | L =1.4 x 1031 PU = 49 |
L =5.4 x 1031 PU = 49 |
L =4.2 x 1032 PU = 49 |
L =2.2 x 1033 PU = 49 |
L =4 x 1033 PU = 49 |
L =6.7 x 1033 PU = 49 |
L =8.3 x 1033 PU = 49 |
L =1 x 1034 PU = 49 |
| ε=2.1 μm | L =1.3 x 1031 PU = 44 |
L =4.9 x 1031 PU = 44 |
L =3.8 x 1032 PU = 44 |
L =2 x 1033 PU = 44 |
L =3.6 x 1033 PU = 44 |
L =6 x 1033 PU = 44 |
L =7.5 x 1033 PU = 44 |
L =9.5 x 1033 PU = 44 |
| ε=2.3 μm | L =1.1 x 1031 PU = 41 |
L =4.6 x 1031 PU = 41 |
L =3.6 x 1032 PU = 41 |
L =1.9 x 1033 PU = 41 |
L =3.4 x 1033 PU = 41 |
L =5.6 x 1033 PU = 41 |
L =7 x 1033 PU = 41 |
L =8.9 x 1033 PU = 41 |
Assuming fast leveling to β* = 30 cm, one would get the following:
| β* = 30 cm |
|---|
| Emittance \ #bunches | 3b | 12b | 75b | 300b | 600b | 900b | 1200b | 1500b |
|---|---|---|---|---|---|---|---|---|
| ε=1.8 μm | L =1.8 x 1031 PU = 63 |
L =7.1 x 1031 PU = 63 |
L =5.5 x 1032 PU = 63 |
L =2.9 x 1033 PU = 63 |
L =5.3 x 1033 PU = 63 |
L =8.7 x 1033 PU = 63 |
L =1.1 x 1034 PU = 63 |
L =1.4 x 1034 PU = 63 |
| ε=2.1 μm | L =1.6 x 1031 PU = 57 |
L =6.5 x 1031 PU = 57 |
L =5 x 1032 PU = 57 |
L =2.6 x 1033 PU = 57 |
L =4.8 x 1033 PU = 57 |
L =7.9 x 1033 PU = 57 |
L =9.8 x 1033 PU = 57 |
L =1.3 x 1034 PU = 57 |
| ε=2.3 μm | L =1.5 x 1031 PU = 54 |
L =6.1 x 1031 PU = 54 |
L =4.7 x 1032 PU = 54 |
L =2.5 x 1033 PU = 54 |
L =4.5 x 1033 PU = 54 |
L =7.4 x 1033 PU = 54 |
L =9.2 x 1033 PU = 54 |
L =1.2 x 1034 PU = 54 |
For a bunch intensity of 1.4 x 1011 ppb, the above numbers should be multiplied by a factor 1.36.