Photon Test Matrix

Proposed changes

From 17 (20) MeV to 24 MeV

• Efficiency falls rapidly as energy decreases
• Very little energy in the CAL
• 17 MeV is actually two lines (so 24 MeV is preferable)

From 50 MeV to 70 MeV

From 100 MeV to 200 MeV

• cross section is changing rapidly at 100 MeV
• will be defined by beam availability

Add at least one  f angle : 30 degrees ?

Iss1ues

1) Assume van Der Graaf for 24 MeV (p-tritium) need to investigate safety issues

2) Need beam for 70 MeV (simulation using electrons, incoherent beam, channeling, free electron laser)

3) > 100 MeV assume coherent beam and incoherent as a back up.