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28-30 April 2014
Fermi National Accelerator Laboratory
US/Central timezone

Energy deposition studies for the LBNE beam absorber*___________________________________________

Apr 28, 2014, 6:30 PM


Igor Rakhno (Fermi National Accelerator Laboratory)


The Long-Baseline Neutrino Experiment (LBNE) at Fermilab is supposed to provide the world’s highest-intensity neutrino beam for the US program in neutrino physics. The corresponding incoming proton beam power can ultimately be as high as 2.3 MW, and the underground beam absorber at the end of the decay channel with related infrastructure is supposed to operate with little or no maintenance for about 20 years. Such a combination of long operation time and high deposited power imposes strict limitations on design of the absorber. In this paper, we describe results of detailed Monte Carlo energy deposition studies performed for the absorber core and the surrounding shielding with the MARS15 code. The model of the entire facility, that includes the pion-production target, focusing horns, target chase, decay channel, hadron absorber system – all with corresponding radiation shielding – was developed using the recently implemented ROOT-based geometry option in the MARS15 code. This option provides substantial flexibility and automation when developing complex geometry models. Both normal operation and accidental conditions were studied. Various design options were considered, in particular the following: (i) filling the decay pipe with air or helium; (ii) the absorber mask material and shape; (iii) the beam spoiler material and size. Results of detailed thermal calculations with the ANSYS code helped to select the most viable absorber design options. *Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.


Energy deposition studies with the MARS15 code for the Long-Baseline Neutrino Experiment at Fermilab are presented.

Primary author

Igor Rakhno (Fermi National Accelerator Laboratory)


Igor Tropin (Fermi National Accelerator Laboratory) Nikolai Mokhov (Fermilab)

Presentation Materials