The field of scattered radiation in the tunnel of the proton storage ring HERA: measurements and calculations

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 438; no. 2; pp. 560 - 572
• Main Authors: Dinter, H., Leuschner, A., Tesch, K., Dworak, D., Loskiewicz, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 11-12-1999
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(99)00844-X

The field of scattered radiation produced by a stored 820 GeV proton beam in the HERA tunnel is studied. Neutron spectra and doses as well as fluences of charged particles were measured by means of conventional detectors. Secondary particles emitted at both small and large angles with respect to the beam are investigated. They were produced by interactions of the primary beam with a collimator and by interactions in the beam pipe with the rest gas, respectively. The results are compared with simulations performed by the Monte Carlo code FLUKA. Simplified geometries of the accelerator structure and its surroundings were used for the calculation. Measured and calculated doses agree within a factor of 2. On the basis of this agreement an analysis of the scattered radiation was performed by FLUKA to obtain fluences and doses due to scattered neutrons, protons, pions, electrons, positrons, and photons.