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[[Nika2Run67-2|Back to the NIKA2 Run 67 (pol) main page]] <<BR>> COSMOCal project
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= Daily Reports =
<<TableOfContents(2)>>
'''saturday september 28 2024'''

summary of operations :
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'''IRAM staff at Pico:'''
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'''Relevant conditions at starting:'''
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'''friday september 27 2024'''
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== September 23rd, Monday == '''thursday september 26 2024'''

* with the source off, the hwp placed on the optical path but not spinning, we pointed the sky (close to the north pole) and then a source, on it we performed focus scans and pointing to check the corrections
* we moved to the mm source by running track command on pako, using the coordinates known from holography
* on the acquisition software, we looked for resonances and tuned them (with hwp still off), which was quite easy
* we started spinning the hwp at nominal 3Hz frequency
* we switched on the mm source along with the chopper, modulating at 1Hz
* at first, we saw no signal, but then we realised that the source's polarizer was set to 0º, hence minimising the signal, so we turned it to ~45º the signal appeared, with the correct hwp + chopper modulations
* at this point, we started procedure to maximise the signal, by tilting the mm source in Az and El : here came some problems --> lost resonances, irregular signal (appearing and disappearing) and we could not go back to initial situation
* so we closed the vertex to see if the problem was in kids or in real signal, and we saw a constant signal of ~2kHz
* we opened the vertex again, tuned the resonances and the situation was quite stable again, so we took 3 ON-OFF scans

COSMOCal project

saturday september 28 2024

summary of operations :

friday september 27 2024

thursday september 26 2024

* with the source off, the hwp placed on the optical path but not spinning, we pointed the sky (close to the north pole) and then a source, on it we performed focus scans and pointing to check the corrections * we moved to the mm source by running track command on pako, using the coordinates known from holography * on the acquisition software, we looked for resonances and tuned them (with hwp still off), which was quite easy * we started spinning the hwp at nominal 3Hz frequency * we switched on the mm source along with the chopper, modulating at 1Hz * at first, we saw no signal, but then we realised that the source's polarizer was set to 0º, hence minimising the signal, so we turned it to ~45º the signal appeared, with the correct hwp + chopper modulations * at this point, we started procedure to maximise the signal, by tilting the mm source in Az and El : here came some problems --> lost resonances, irregular signal (appearing and disappearing) and we could not go back to initial situation * so we closed the vertex to see if the problem was in kids or in real signal, and we saw a constant signal of ~2kHz * we opened the vertex again, tuned the resonances and the situation was quite stable again, so we took 3 ON-OFF scans

DailyReportsNika2Run67-2 (last edited 2024-09-30 21:11:51 by NikaBolometer)