2. Expected performance

The expected performance of KOOLS-IFU mounted on Seimei telescope is described below.

Note: KOOLS-IFU has neither the imaging nor the slit-spectrocopy mode.

# Spatial Performance
Number of fibers 127
FoV of a fiber 0.93 ± 0.04 arcsec diameter (design: 0.91 arcsec)
Fiber pitch 1.16 ± 0.05 arcsec (design: 1.14 arcsec)
Total FoV 15.1 ± 0.7 arcsec diameter (design: 14.8 arcsec)
Fiber core filling factor 58%

# Spectral Performance
Grism VPH-blue VPH-red VPH 495 VPH 683
Wavelength coverage 4100-8900 Å 5800-10200 Å 4300-5900 Å 5800-8000 Å
Spectral resolution ~500 ~800 ~1500 ~2000
Total throughput*† ~6% ~6% ~3.5% ~6%

*: not measured yet
†: including the fiber core filling factor at the 2D array (58%)
‡: in normal observations, use an order-sorting filter O56, which blocks < 5600 Å light

# CCD
Overhead time per exposure 21.5 seconds
Recommended exposure time 1-1800 seconds (integer only)
Linearity ~1% or better
Saturation count 65535 ADU (plan)

# Other information
Typical time of grism change 10-20 seconds