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Unusual increase of "noise" at irregular time intervals after cleaning the ion source of QQQ 7000

Question asked by cj1 on Jul 16, 2020
Latest reply on Jul 24, 2020 by cj1

Hello,

 

after cleaning the ion source of our QQQ 7000, the measurements show an unusual increase of "noise" at irregular time intervals of the run, as shown in the attached image. This was also observed on the manual tune page. This increase mostly extends over the whole spectrum of a scan or sometimes only appears in random blocks of the spectrum. The "Detector Dark Current Check" of the Autotune Report shows an unexpected high level.

 

Any help would be most appreciated.

 

Best regards

Christoph

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