Speaker
Dr
Thomas Otto
(CERN SC-RP)
Description
The CNGS target will receive up to 4.5E19 protons in one year. To achieve
this goal,approximately 1.3E19 protons will be lost in the PS, 50 % during
acceleration and 50% during multiturn extraction. This contribution analyses
the radiological consequences of the increased beam losses. It is focussed
on two main issues:
1.) Radiation leaking through the weak points of the PS shielding (skyshine
effect),exposing personnel working on the CERN site and members of the
public outside of CERN.
2.) Activation of material in the PS and consequently, personal doses during
maintenance. The estimates are confronted with measurements made during
the test phase in October 2004.
The consequences of the increased beam intensity include the risk of
exceeding dose limits at the CERN fence, the unjustified exposure of
personnel on the CERN site and an increase of personal doses during
maintenance. These effects can be mitigated by a systematic reduction of
losses in the PS. Until then, intensity limitations and longer waiting times
before performing maintenance may be required.
Author
Dr
Thomas Otto
(CERN SC-RP)
