11/15/2005 1

Radiation Protection Issues for ILC (not exhaustive)

A. Fassò, N. Noriaki, H. Vincke

Radiation Physics

11/15/2005 2

 Dose in an IR Hall when the other one is operating  with tunnel passing near a Hall  with two Halls at the same level  shielding of assembly area or local counting house (?)

Radiation field:   direct bremsstrahlung/muons   brems. interaction in detector neutrons   e+/e- collisions?

We need:    approx. geometry of tunnel and Halls   approx. loss position and magnitude option priority: 14/2 mrad or 14/20 mrad? possible dimensions/composition of the “self shielding” detector

Issues:  BCS, PPS

11/15/2005 3

11/15/2005 4

Collimation section activation of collimators/maintenance planning activation of air, soil and water We need: approx. geometry of tunnel and collimators impact scenario, loss size Issues: tunnel shielding, local shielding, BCS, PPS

11/15/2005 5

Dumps extracted beam dump commissioning dump We need: details of dump construction (materials, windows, etc.) Issues: air, soil and groundwater activation dose rates for maintenance radiation resistance (window) effects on water

Note: some work already done by DESY and SLAC

11/15/2005 6

Shallow tunnel site radiation leaking

We need: tunnel dimensions approx. component position loss scenarios

Issues: minimum overhead thickness     

11/15/2005 7

Radiation damage to electronics to other components?

We need: changes since S. Roesler’s NLC calculations loss scenarios position and geometry of components

Issues: alcoves, parallel gallery access/doses in parallel gallery

Note: M. Kostin already performed calculations on radiation damage on magnet coils in the delivery section. Sufficient?

11/15/2005 8

Positron source conventional undulator

We need: design

Issues: radiation damage activation (machine, air, soil, groundwater)  quenching of magnet

11/15/2005 9

SC cavities quenching radiation emission

We need: design details

Issues: radiation streaming to klystron galleries?