ENERGY DEPOSITION IN A THIN COPPER TARGET DOWNSTREAM AND OFF AXI S OF A PROTON RADIOGRAPHY TARGET.

GREENE,G.A. ; FINFROCK,C.C. ; HANSON,A.L. ; MURRAY,M.M.

Brookhaven National Laboratory

关键词: Copper;    Proton Radiography;    Superconducting Magnets;    Shielding;    Thickness;   

DOI  :  10.2172/799479
RP-ID  :  BNL--52668
RP-ID  :  AC02-98CH10886
RP-ID  :  799479

美国|英语

来源: UNT Digital Library

【 摘 要 】

A series of proton energy-deposition experiments was conducted to measure the energy deposited in a copper target located downstream and off-axis of a high-energy proton-radiography target. The proton/target interactions involved low-intensity bunches of protons at 24 GeV/c onto a spherical target consisting of concentric shells of tungsten and copper. The energy-deposition target was placed at five locations downstream of the proton-radiography target, off-axis of the primary beam transport, and was either unshielded or shielded by 5 or 10 cm of lead. Maximum temperature rises measured in the energy-deposition target due to single bunches of 5x10{sup 10} protons on the proton-radiography target were approximately 20 mK per bunch. The data indicated that the scattered radiation was concentrated downstream and close to the primary transport axis of the beam line. The energy deposited in the energy-deposition target was reduced by moving the target radially away from the primary transport axis. Lead shielding in front of the target further reduced the energy deposition. The measured temperature rises of the energy-deposition target were empirically correlated with the distance from and the number of protons incident on the proton-radiography target, the thickness of the lead shielding, and the angle of the energy-deposition target off-axis of the beam line from the proton-radiography target. The correlation of the experimental data provides a starting point for the evaluation of the shielding requirements for devices downstream of proton-radiography targets such as superconducting magnets.