Luminosity

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High-precisision measurements at an EIC will require a sufficiently large beam luminosity.
This page contains information concerning the achievable luminosity of eRHIC based on current designs for the collider.

Contents

THIS PAGE WILL BE UPDATED SOON TO ACCOUNT FOR THE NEWEST DESIGN DEVELOPMENTS

eRHIC

The eRHIC design has an electron beam with energies ranging from 4 to 20 GeV (and 30GeV). The hadron beam energy can be varied and has it maximum at 325 GeV for protons, giving a maximum centre of mass energy of 161 GeV (200GeV). It is planned to also have polarized He-3 beams. The protons can have at all energies either longitudinal and transverse polarization and the leptons have longitudinal polarisation.
Maximum beam energy for gold nuclei is 130 GeV/A. RHIC can run a huge variety of nuclei from D, over Si, Cu to Au
Protons as well as nuclei beams can be run at lower energies as 325 /130 GeV/c/A, the luminosity scales for the lower energies as described in the table below.
The eRHIC design assumes CeC (Litvinenko and Derbenev, 2009) to be implemented.
The staging of eRHIC is done in the RF of the machine, if more money is available the linacs will be extended and the lepton energy increases. All other machine elements will be there from the beginning. The lowest lepton beam energy is 5 GeV. For all stages of eRHIC the first machine elements are at 5m from the IP.
For more details please look to [following slides].

The luminosity and beam parameters for the eRHIC design are given in the table below. Assuming an operational efficiency of 50%, the integrated luminosity per week of running is ∼ 4 fb-1. For 30GeV x 325GeV/130 GeV/A the luminosity is at the 20% level of this for 20GeV x 325GeV/130 GeV/A, due to the reduced lepton beam current to keep the synchrotron radiation under control

Luminosity and beam parameters of the eRHIC design.


polarized eRHIC Luminosity

updated 11th of February 2012

PLEASE realize currently there is no possibility for hadron energies of 325 GeV at eRHIC

sqrt(s) 36.3 57.6 51.4 81.5 72.7 115.2
Beam Energies 5x66 5x166 10x66 10x166 20x66 20x166
eHe-3 4e+32 6.5e+33 4e+32 6.5e+33 4e+32 6.5e+33

updated 13th of January 2011

sqrt(s) 31.6 38.7 44.7 51. 70.7 80.6 44.7 54.8 63.2 72.1 100. 114.0 63.2 77.5 89.4 101.9 141.4 161.2 77.5 94.9 109.5 124.9 173.1 197.5
Beam Energies 5x50 5x75 5x100 5x130 5x250 5x325 10x50 10x75 10x100 10x130 10x250 10x325 20x50 20x75 20x100 20x130 20x250 20x325 30x50 30x75 30x100 30x130 30x250 30x325
ep 0.077e+33 0.26e+33 0.62e+33 1.4e+33 9.7e+33 15e+33 0.077e+33 0.26e+33 0.62e+33 1.4e+33 9.7e+33 15e+33 0.077e+33 0.26e+33 0.62e+33 1.4e+33 9.7e+33 15e+33 0.015e+33 0.05e+33 0.12e+33 0.28e+33 1.9e+33 3.0e+33
eA 0.49e+33 1.7e+33 3.9e+33 8.6e+33 0.49e+33 1.7e+33 3.9e+33 8.6e+33 0.49e+33 1.7e+33 3.9e+33 8.6e+33 0.1e+33 0.34e+33 0.77e+33 1.7e+33

unpolarized eRHIC Luminosity

updated 13th of January 2011

sqrt(s) 31.6 38.7 44.7 51. 70.7 80.6 44.7 54.8 63.2 72.1 100. 114.0 63.2 77.5 89.4 101.9 141.4 161.2 77.5 94.9 109.5 124.9 173.1 197.5
Beam Energies 5x50 5x75 5x100 5x130 5x250 5x325 10x50 10x75 10x100 10x130 10x250 10x325 20x50 20x75 20x100 20x130 20x250 20x325 30x50 30x75 30x100 30x130 30x250 30x325
ep 0.39e+33 1.3e+33 3.1e+33 5.0e+33 9.7e+33 15e+33 0.39e+33 1.3e+33 3.1e+33 5.e+33 9.7e+33 15.0e+33 0.077e+33 0.26e+33 0.62e+33 1.4e+33 9.7e+33 15e+33 0.015e+33 0.05e+33 0.12e+33 0.28e+33 1.9e+33 3.0e+33
eA 2.5e+33 8.3e+33 11.4e+33 18.0e+33 2.5e+33 8.3e+33 11.4e+33 18.0e+33 0.49e+33 1.7e+33 3.9e+33 8.6e+33 0.1e+33 0.34e+33 0.77e+33 1.7e+33


Here is the visual representation of the luminosity of eRHIC and other ep/eA colliders
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