LCGT Meeting 12 October, 2010 Norikatsu Mio

Laser Discussion with Mitsubishi – Mitsubishi will offer their laser modules as a laser component and permit us to transfer them to other laser manufactures in order to assemble the laser system. – We will have a meeting on next Friday concerning the price and due date. Fiber laser – Commercial fiber laser: 40W=> 9MYen. – Two lasers will be introduced as a seed laser system. – We will have a meeting on next Thursday concerning the price and due date.

Alternative design Mitsubishi laser modules Fiber laser amplifiers NPRO(200mW) 40 W 80 W 200 W

Mirror Size of the mirrors for main cavities (25cm or 30cm) should be determined. – Design of vibration isolation systems depends on this determination. – If a coating machine is newly developed, there is no significant difference between two sizes. – If LIGO mirrors are used, we consider their dimensions (  25cm x t10cm and 10kg). If we decide to make full use of LIGO’s mirrors for iLICGT, we can save money and time; this fact enables us to develop the elements that are necessary for bLCGT.

Plan A’ For iLCGT, the size of the mirrors is chosen as that of iLIGO’s mirror. BS and ITMs will be newly fabricated from Japanese Silica.

Vibration Isolation iLCGT bLCGT ITMX,ITMY,ETMX,ETMY Type-A IP-GASF （ Fixed) Type-B’ payload Type-A IP-GASF Type-A payload(Cryo) BSStack Type-A payload Type-B IP-GASF Type-A payload PRM,PR2,PR3,SRM,SR2,SR3Stack Type-B’ payload Type-B IP-GASF Type-B’ payload MC2F,MC2E,MMT,PDType-C Type-A payload ： 30kg Type-B’ payload ： 10kg Type-B payload ： 16kg

Sapphire Reply from GT Crystal systems – Current Max size of C-axis mirror:  20cm x t15cm A-Plane mirror:  25cm x t15cm “With time we feel can develop larger C-axis sapphire slabs to achieve your goal of 25cm x 15cm sapphire mirrors with our HEM growth process.” Inquiring – when we can obtain C-axis mirror of  20cm x t15cm? – price and delivery time of max size of C-axis mirror(  20cm x t15cm) and A-Plane mirror (  25cm x t15cm). – No answer.