= MIF Meeting 2013/2/26 =

=== Date/Location ===
2013/2/26, !SeeVogh

=== Participants ===
Aso, Yamamoto, Somiya, Nakano, Takahashi, Akutsu, Shibata

=== Fast beam shutter ===

 * The first prototype was made at Somiya Lab. by Ueda-kun and Tobias.  The initial test yielded less than 1msec shut down time.  (The shutter was 1mm away from the center of the beam)

 * Larger separation from the beam center is necessary to avoid scattering by the shutter blade (roughly 1cm).  Bigger capacitor is necessary.

 * The prototype system exploded and currently it is not usable.

 * Cost to make one is less than 10000JPY.

 * We need to estimate the maximum amount of power falling onto the PDs.

 * Is it possible to just shutting down the beam at the output of the laser.

=== Vacuum enclosure ===

 * Cosmotec is expensive
 * Contact the company making the aLIGO's PD enclosures

=== Suspension Modeling ===

 * Checked the validity of the methodology by constructing a double pendulum model and comparing it with the hand solved analitic formula. They agreed well.

 * Needs better filters to realize true damping.

 * Construct a rigid body double-pendulum model next.

 * Then construct a Type-B payload only model.

=== KAGRA de-scoping related ===

===== Inferior suspension =====
 * Length requirement is OK for PRC
 * ASC requirement has to be checked

===== No Green Lock =====
 * Digital Interferometry (Nikhef)

===== No OMC =====
 * Noise calculation with RF

===== No BRT =====
 * Not an option. Needs more discussion
 * How to extract the transmission beam if there is no iKAGRA ETM chamber.

== A/I ==
 * Ask Nishida-san to work on the estimation of the maximum power falling on the PDs using e2e (Somiya)
 * Construct rigid body models of suspensions (Nakano)
 * Contact the company making the aLIGO's PD enclosures (Akutsu)
 * Alignment noise requirement for PRC/SRC mirrors
 * RF DARM noise (Aso)
 * Further discussion of BRT (Akutsu)