Difference: LArCaloPublicResultsDetStatus (35 vs. 36)

Revision 362019-01-29 - SteffenStaerz

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Liquid argon temperature stability and homgeneity

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Liquid argon temperature stability and homogeneity

 

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LAr Purity Stability:

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LAr Purity Stability

 
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Measured impurity in oxygen equivalent of the liquid argon in the barrel cryostat (run 2): Each point shows the mean of the purity values measured during one week starting at the beginning of 2015 until the end of 2018. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The decreasing trend in all monitors is correlated with the data taking periods. A clear explanation is not yet found, a change of other input parameters (like temperature or high voltage of the ionization chambers) is excluded. The measured purity in barrel A 1 after middle 2016 is excluded due to problems which are not yet understood. Barrel A 2 and barrel C 4 monitors are not working properly.

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File 'barrels_run2' not found!
eps version, pdf version

Measured impurity in oxygen equivalent of the liquid argon in the barrel cryostat (run 1 + run 2): Each point shows the mean of the purity values measured during one week starting at the end of 2009 until the end of 2018. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The decreasing trend in all monitors is correlated with the data taking periods. A clear explanation is not yet found, a change of other input parameters (like temperature or high voltage of the ionization chambers) is excluded. The leap of the measured purity in barrel A 4 at the beginning of 2010 is unclear; a connection with an actual improvement of the purity can be excluded. The measured purity in barrel A 1 after middle 2016 is excluded due to problems which are not yet understood. Barrel A 2 and barrel C 4 monitors are not working properly.

File 'barrels_run12' not found!
eps version, pdf version

Measured impurity in oxygen equivalent of the liquid argon in the end-cap cryostat on side A (run 2): Each point shows the mean of the purity values measured during one week starting at the beginning of 2015 until the end of 2018. Last letter A, B or C in the legend corresponds to the monitor position with respect to phi. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage.

File 'cryo_a_run2' not found!
eps version, pdf version

Measured impurity in oxygen equivalent of the liquid argon in the end-cap cryostat on side A (run 1 + run 2): Each point shows the mean of the purity values measured during one week starting at the end of 2009 until the end of 2018. Last letter A, B or C in the legend corresponds to the monitor position with respect to phi. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The decreasing trend in all monitors before LS1 is correlated with the data taking periods. A clear explanation is not yet found, a change of other input parameters (like temperature or high voltage of the ionization chambers) is excluded.

File 'cryo_a_run12' not found!
eps version, pdf version

Measured impurity in oxygen equivalent of the liquid argon in the end-cap cryostat on side C (run 2): Each point shows the mean of the purity values measured during one week starting at the beginning of 2015 until the end of 2018. Last letter A, B or C in the legend corresponds to the monitor position with respect to phi. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The measured purity in HEC 1 C B after middle 2016 is excluded due to problems which are not yet understood. HEC 1 C C, HEC 2 C B and EC C top monitors are not working properly.

File 'cryo_c_run2' not found!
eps version, pdf version

Measured impurity in oxygen equivalent of the liquid argon in the end-cap cryostat on side C (run 1 + run 2): Each point shows the mean of the purity values measured during one week starting at the end of 2009 until the end of 2018. Last letter A, B or C in the legend corresponds to the monitor position with respect to phi. Periods between pp-runs are marked hatched. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The decreasing trend in all monitors before LS1 is correlated with the data taking periods. A clear explanation is not yet found, a change of other input parameters (like temperature or high voltage of the ionization chambers) is excluded. The measured purity in HEC 1 C B after middle 2016 is excluded due to problems which are not yet understood. HEC 1 C C, HEC 2 C B and EC C top monitors are not working properly.

File 'cryo_c_run12' not found!
eps version, pdf version

 Measured impurity of the liquid argon in the barrel cryostat: Each point shows the mean of the purity values measured during one week starting middle of 2009 until beginning of 2016. Periods between pp-runs are marked gray. Data points during collisions are not taken into account due to high radiation in the calorimeter that lead to signals in the ionization chambers. Most of the monitors show charge-up effects after periods of time without high voltage. The decreasing trend in all monitors is correlated with the data taking periods. A clear explanation is not yet found, a change of other input parameters (like temperature or high voltage of the ionization chambers is excluded). The leap of the measured purity in barrel A4 at the beginning of 2009 is unclear; a connection with an actual improvement of the purity can be excluded. See here for more information.
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  Here is the link to the paper, with all the figures available.
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