Efficiency of PEPSI Fibers

The PEPSI fiber efficiencies in percent are provided below, with the most recent results on the bottom.

June 29, 2022

PEPSI efficiency percentages measured June 29, 2022, after the fiber replacement.

 

September 3, 2022

PEPSI fiber efficiency measured Sept 3rd, 2022, after the 2022 summer shutdown. Focus on CD-V. The results are consistent with efficiencies measured in June 2022.  No notable difference was seen after the summer shutdown showing the fiber efficiency is unchanged.

 

September 8, 2023

System efficiency in percent beyond Earth’s atmosphere at LBT with PEPSI PFU. Two flux standard stars were observed for redundancy: HR 718 V=4.3 (B9III) and HR 9087 V=5.1 (B7III) on September 8, 2023. Seeing conditions were 0.5/0.6″ on the two sides with clear sky.  LBT mirrors recoated during 2023 summer shutdown: DX M1+M3, SX ASM M2.  PEPSI fiber heads were cleaned and attached to the fiber injection optics with a refractive index matching solution. The two new STA1600 CCDs were also installed. Overall gain is 1.5-2 as compared to September 2022.