7 research outputs found
Relative luminosity measurement of the LHC with the ATLAS forward calorimeter
In this paper it is shown that a measurement of the relative luminosity
changes at the LHC may be obtained by analysing the currents drawn from the
high voltage power supplies of the electromagnetic section of the forward
calorimeter of the ATLAS detector. The method was verified with a reproduction
of a small section of the ATLAS forward calorimeter using proton beams of known
beam energies and variable intensities at the U-70 accelerator at IHEP in
Protvino, Russia. The experimental setup and the data taking during a test beam
run in April 2008 are described in detail. A comparison of the measured high
voltage currents with reference measurements from beam intensity monitors shows
a linear dependence on the beam intensity. The non-linearities are measured to
be less than 0.5 % combining statistical and systematic uncertainties.Comment: 16 page
Source of polarised deuterons
The proposed project assumes the development of a universal high-intensity source of polarized deuterons (protons) using a charge-exchange
plasma ionizer. The design output current of the source will be up to 10 mA
for and polarization will be up
to of the maximal vector () and tensor (+1,-2) polarization.
The project is based on the equipment which was supplied within the framework
of an agreement between JINR and IUCF (Bloomington, USA). The project will be
realized in close cooperation with INR (Moscow, Russia). The source will be
installed in the linac hall (LU-20) and polarization of beams will be measured
at the output of LU-20. The main purpose of the project is to increase the
intensity of the accelerated polarized beams at the JINR Accelerator Complex up
to 1010 d/pulse. Calculations and first accelerator runs have shown that
the depolarization resonances are absent for the deuteron beam in the entire
energy range of the NUCLOTRON. The source could be transformed into a source of
polarized negative ions if necessary. The period of reliable operation without
participation of the personnel should be within 1000 hours. The project should
be implemented within two to two and a half years from the start of funding