Minutes of the ISC Meeting on 2015/9/7

2015/9/7 14:00 - 15:00 Participants: Nagano, Enomoto, Hirose, H. Yamamoto, K. Yamamoto, Y. Michimura, Miyakawa, Aso, Arai, Akutsu, Hirose

Electronics preparation status for iKAGRA

• Summary by Michimura-kun

• Need to check if the power cables for the DC PD were purchased (A/I Aso)
• Need to make a cabling diagram as soon as possible. (A/I Michimura)
• Need to make patch panel to be mounted on the optical tables.
• The low loss RF cables are very rigid. Need to mount N-connectors on patch panels.

Output Optics

OMC suspension

• OMC suspension slides by Somiya-san

• KAGRA's requirement on the OMC vibration is about 100 times more stringent than aLIGO. However, aLIGO's OMC suspension performance seems to be comparable to KAGRA requrirement (to be checked).
• aLIGO used different approach (scattering) to set the isolation requirements.
• Somiya-san proposed to use UWA suspensions.
  • If the OMC is suspended by one wire, it will move a lot. So actively controlling the orientation is important.

Output Optics Layout

• We need to fix the number of chambers, size, height and locations.
• We will proceed with current proposal by Somiya-san.
• Aso will check the mode matching calculations
• OMC chamber may be a bit too crowded ?
  • aLIGO OMC damps all the ghost beams inside the OMC
  • It is better to enclose the OMC with black glass walls to protect it from stray lights
  • Beam dumps only have to take care of micro watts, if the OMC is protected by a beam shutter.

Next Meeting

The next next Monday is a holiday. So the next meeting will be 4 weeks later. 2015/10/5(Mon) 14:00 - 15:00 I will consider if we can have a meeting somewhere earlier.