Muon Monitor Analysis Update Analysis of beginning second Run + - - PowerPoint PPT Presentation

Muon Monitor Analysis Update

• Analysis of beginning second Run + comparison with old (first NOvA run) data  see slides NuMI Operations February 4, 2016
• Here: Second Run data from 23 October 2015 to 8 March 2016
• Signals are normalized to the POT, corrected for the pedestals and for the pressure using the calibration chambers

About the calibration chambers:

• There are wrong readings that I have to filter out before applying the correction (see next slides)
• I’m not considering the data when the calibration chamber swic was not running

For Muon Monitor 1 and 2

• An additional correction is applied point by point taking into account horn current variations using the analysis done last year

during the horn scan periods For Muon Monitor 3 and MM1/MM2, MM2/MM3 Ratios

• The horn current variations are not taken into account since I don’t have the same analysis in this cases

Muon Monitors – Calibration Chambers

Wrong readings to be filtered

• There are wrong data clearly out of the

distribution

• There are periods when the calibration

chamber swic was not running  don’t compute the corresponding MM signal in those cases

• Plus, we need to filter out wrong readings,

can’t really just cut them since they’re in the distribution of the good values

Here’s an example for Calibration Chamber104 (MM1) same considerations are valid for the other 2 Calib. Ch.

Muon Monitor 1 and Muon Monitor 2 – Correction for the Horn Current variations

Measured values during the Horn Scans in 2015

Use fit parameters to apply correction for horn current variations point by point

Last year I analyzed the MM data during the horn current scans  so we can check what happens applying a correction for the current variation

The correction applied is m’ = mmeasured – mexpected + mnominal from fit

MM1 nominal value from Run1: 0.2699 MM2 nominal value from Run1: 1.244 13Oct2015 8Mar2016 13Oct2015 8Mar2016 13Oct2015 8Mar2016 Second Run – before horn current correction – POT norm, Ped&Press Corr.

MM1 MM2 Horn Current

Muon Monitor 1 – Correction for the Horn Current variations

• Before Horn Current Correction
• After correction

 -2% variation since beginning of Run2  -1.7% in the first period (<17Jan)  -0.3% in the second period (>17Jan)

23Oct2015 17Jan2016 8Mar2016

Muon Monitor 2 – Correction for the Horn Current variations MM2: -1% variation since beginning

• f Run2

 -1.% in the first period (<17Jan)  -0.2% in the second period (>17Jan)

• Before Horn Current Correction
• After correction

23Oct2015 17 Jan2016 8Mar2016

Muon Monitor 1&2 after Horn Current Correction Vs POT

13Oct2015 8Mar2016

Muon Monitor 3 and MM1/MM2, MM2/MM3 Ratios

23Oct2015 8Mar2016 23Oct2015 17Jan 2016 8Mar2016

MM3: +5% from Run start to 17 Jan +2% after 17 Jan MM1/MM2: -0.2% variation since beginning of Run2 ….The ratio is very stable as expected since MM1&MM2 have the same behaviour MM2/MM3:

• 7% from Run start to 17 Jan
• 2% after 17 Jan

..as expected because MM2 decreases while MM3 increases

23Oct2015 17Jan 2016 8Mar2016

Muon Monitor 3 and MM1/MM2, MM2/MM3 Ratios VS POT

Muon Monitors – Centroids

My definition:

• I defined the horizontal and vertical positions taking the distances

from one chamber center to the next chamber center

• The horizontal distance between two chambers is 25,4 cm, same for

vertical

• The central chamber corresponds to (0,0) position, negative

positions are on the left and on the bottom, positive positions on the right and on the top

Muon Monitors – Centroids

Gas change + beam restart (not stable)

MM1 &MM2 Horizontal Centroid <0.5cm variation since Run start MM1 &MM2 Vertical Centroids are known to follow the horn current 

Muon Monitor 1 – Centroids, Horn Current and POT

MM1 Vertical Centroid has about 1 cm decrease since beginning of the run but last period looks stable (it follows the horn current) MM1 Horizontal Centroid is very stable. There’s a little jump in March at the beam restart but we should see with next data a stable behavior again

Muon Monitor 2 – Centroids, Horn Current and POT

MM2 Vertical Centroid has about 1 cm decrease since beginning of the run but last period looks stable (it follows the horn current) MM2 Horizontal Centroid has a variation at the order of a mm. Same little jump when the beam restarted

Muon Monitor Analysis Update - Conclusions

• Second Run data analysed: from 23 October 2015 to 8 March 2016
• Signals are normalized to the POT, corrected for the pedestals and for the pressure using the calibration chambers.
• For the first and second muon monitor a correction to take into account the horn current variation is also applied

Since the beginning of the run the signal decrease is about 1,2 % but after the 17th of January the signals become much more stable (<<1% variation)

• The third muon monitor increases since the Run start, it looks like it’s more stable after January 17 (..still it shows a

+2% increase)

• The MM1/MM2 ratio is as expected very stable and the MM2/MM3 ratio decreases since the MM3 signal increases
• The signals w.r.t. the POT look ok
• The vertical centroids follow the horn current as already seen in the past. It looks like they are more stable in the last part of

the run (the variations are anyway of the order of the cm)

• The horizontal centroids are very stable, at the mm level

 Keep monitoring