jeffrey.kissel@LIGO.ORG - posted 11:05, Thursday 02 April 2026 - last comment - 14:04, Friday 03 April 2026(89752)
Installed SPI ISIJ QPDA TIA
J. Kissel, S. Koehlenbeck H1 SUS-R1 D0902810, S1301885 TIA D1002481-v3, S2500711 Finished with all required assembly and testing of the SPI pathfinder's in-vac ISIJ Reflector assembly (D2400102), we packed it up such that it's install ready. That means it's supporting QPD photodiode transimpedance amplifier, whose [V/A] impedance has been measured and tailored to suit a 10 [V_p] differential ADC input (see 89739) is no longer needed in the optics lab. As such -- we moved it from the optics lab to its final location in the LVEA -- in the U6 position of SUS-R1 by HAM2. Pictures: BEFORE installation AFTER installation S-NUMBER and U-Height zoom for confirmation. We have not cabled up any of its inputs or outputs, but will do -- per D2400111 -- so in the fullness of time.
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EDIT (2026-04-03) Per my own wiring diagram, and for the consideration of extensibility of the SUS-R1 rack, I've edited the above installation -- I've moved this S2500711 SPI TIA chassis for HAM2's ISIJ QPDA from SUS-R1 U6 to SUS-R1 U3. See D2400111 and G2401479-v2. Two "EDIT" pictures attached. I've updated the S1301885 e-traveler as well.
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