== To do list to define new parameters ==

It is important to review past parameters and pick up problems to determine new parameters. Known problems are listed here.

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 * Arm power was defined by sum of both arm powers. It should be a stored power of single arm.
 * How to determine an exact length of arm, for anti resonance of sidebands? For f1? or f2
 * How to determine exact RF frequencies, for HOM of MC2?
 * Total inject power was defiened by only carrier power. It should be defined by total power including carrier and sidebands.
 * Do we need pick off ports? Design of 2007 assumed a pick off mirror between PRM and BS. It won't be existing in the new design, but how about pick off for X arm and Y arm? Should we use AR reflections as the pick off?
 * Redesign of length of MC2 for switching between BRSE and DRSE.
 * How much power is acceptable for single photo diode?
 * Determine macroscopic PRC length and SRC length. It is important to provide this information to the vacuum subgroup to determine the vacuum tube length.