Notes from Independent Study Meeting
                      Feb 07, 2022

Present: Richmond, Dayal

  - Dayal shows the results of adding a photon force to the
          simulation software.

          - first attempt yielded non-sensical results

          - revised version is better; Richmond confirms that the 
                 equations are correct

          - results show the sail with photon pressure added falls
                 toward Sun _faster_ than sail without photon pressure;
                 whoops

          - we find a sign error in the acceleration calculation


  - We discuss how to fix the error

  - Dayal will run simulations on the following two cases:

          - realistic sail, starting at x=1.5E11 meters, motionless
                 (should fall to Sun, but more slowly than no-photon case)

          - sail with unrealistic mass -- 0.001*realistic mass --
                 with same starting conditions.  Should accelerate away
                 from Sun

  - goals for next meeting (Thu, Feb 10): 
   
          - show results of latest simulations