Radiological considerations in the operation of the low-energy undulator test line (LEUTL).

The Linac Extension Area at the Advanced Photon Source

“…This corresponds to a total of 1 kW average electron beam power [29]. Radiological controls at LEA are supported by radiological analysis [30].…”

“…The LEA beamline is housed within bulk shielding to protect personnel outside the beamline enclosure from prompt electromagnetic radiation hazards associated with electron beam operation [30]. The accelerator enclosure is surrounded by an earth berm, illustrated in figure 9.…”

“…Radiation shielding is provided within the LEA enclosure to ensure personnel safety. A movable bremsstrahlung stop (7.62 cm thickness tungsten) is provided in the booster alcove, upstream of the penetration from the booster alcove into the LEA enclosure [30]. The movable stop is designed to shield personnel within the LEA enclosure from bremsstrahlung radiation generated upstream of the LEA enclosure when personnel could safely access the LEA enclosure for maintenance activities.…”

Environmental assessment for enhanced operations of the Advanced Photon Source at Argonne National Laboratory-East, Argonne, Illinois.

“…Among the scenarios analyzed involving beam losses at various APS components, the maximum credible incident (MCI) is based upon a scenario in which the electron beam is lost at the highest elevation in the rising section of the LEUTL line going from the synchrotron to the mezzanine directly above the region of the beam loss (see Figure 4.3 for the location of the incident) (Moe 1998). According to the analysis for the MCI, in which an APS worker was assumed to stand at a distance of 7.9 ft (2.4 m) from the loss point through the 3-ft (1-m) concrete floor of the mezzanine, the estimated dose rate is 13.1 rem/h.…”

Environmental Assessment for Enhanced Operations of the Advanced Photon Source at Argonne National Laboratory-East, Argonne, Illinois

“…Among the scenarios analyzed involving beam losses at various APS components, the maximum credible incident (MCI) is based upon a scenario in which the electron beam is lost at the highest elevation in the rising section of the LEUTL line going from the synchrotron to the mezzanine directly above the region of the beam loss (see Figure 4.3 for the location of the (Moe 1998). According to the analysis for the MCI, in which an APS worker was assumed to stand at a distance of 7.9 ft (2.4 m) from the loss point through the 3-ft (1-m) concrete floor of the mezzanine, the estimated dose rate is 13.1 rem/h.…”