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Re: FRS Calibration Issue [message #17766 is a reply to message #17756] Fri, 16 January 2015 01:45 Go to previous messageGo to previous message
SMilne is currently offline  SMilne
Messages: 30
Registered: July 2014
Location: York
continuous participant
From: *dsl.in-addr.zen.co.uk
Hi Liliana!

Thanks for your response! No worries about the delay, I've actually been very busy with finishing off some other analysis and writing some papers. Smile

This response will actually take two posts due to an attachments limit, but at least it is (hopefully) good news.

Just to summarise, the issue is this, when using the TPCs for determining the x positions and therefore the A/Q we end up losing ~80% of the data because the TPCs are too slow (at least for the rates we were using). Therefore we want to use the scintillators, which are faster (although with a worse position resolution), to determine the A/Q. So in short, we are currently trying to calibrate the scintillator positions. The issues, as you will see in my second post, are indeed related to some weird FRS ToF issues, just as you suggested.

Just for your interest I have still produced the spectra which you asked for in case they still serve some purpose.
- TPC Position vs Sc21 dt left-right [raw] (for both the 1st calibration point and the last few runs of 46V)
- TPC Position vs Sc41 dt left-right [raw] (for both the 1st calibration point and the last few runs of 46V)
- TOF for all 4 calibration runs [calibrated] (on the same graph, including a range that covers all entries)

[Updated on: Fri, 16 January 2015 02:12]

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