MedAustron beam time structure: from HT Lau 21Jun19
===================================================

 * Typical beam spill for protons: 5 seconds
 * Typical beam spill for carbon:  4 seconds

 * Average time between spills:    2 seconds
 * Minimum time between spills:    1 seconds


Proton time structure:
----------------------

                 Beam on -- 5s
            +----------------------+             +-------------
            |                      |             |
    --------+                      +-------------+
                                      Beam off
                                        1-2 s
So:
  * Period (T) of beam delivery for protons: T = 6s --- minimum 
                                               = 7s --- average

Carbon time structure:
----------------------

                 Beam on -- 4s
            +----------------------+             +-------------
            |                      |             |
    --------+                      +-------------+
                                      Beam off
                                        1-2 s
So:
 * Period (T) of beam delivery for carbons: T = 5s --- minimum 
                                               = 6s --- average

Time structure within beam spill:
---------------------------------

 * Debunching follosed by slow extraction ensures that beam within
   spill is 'DC'. 

 * We should assume for the moment the rate is flat over the spill.

KL: version 1, 26Jun19