Transcript Slides - Indico

MEG I
Accounting & Retrospective
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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MEG 2013 Accounting
2013 Total of 802.5 shifts (642 Normal, 160.5 coordinator shifts)
Basically ALL Shifts Quotas apart from some swap differences SATISFIED
Exception: 2013 Shift List based on 58 Authors –
Later Lecce added an extra Author making it 6 not 5!
Agreed upon that accounting would as with previous
instances be compensated for later
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
Accounting
Amendment
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Final 2013 Accounting
These numbers in principle carry-over to MEG2
With this accounting taken into consideration – ALL MEG Institutes Fulfilled their
Shift Quota Obligations, based on the % Authors within the Collaboration
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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MEG I Complete Accounting
Engineering Run – end 2007
1st Physics Run - 2008
Last Physics Run - 2013
Total MEG I Shifts:
MEG I Active Authors:
5857.5
54 - 64
Total Shift Coordinators:
115
(optimized finally to 1 week duty)
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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Statistics
Based on Period Normalization Factor k:
k
•
2008 Run seen as Problematic
k does not match trend Mustops
(DC HV-stability)
•
2012 Run with best statistics of MEG I
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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MEG I – To Dos!
Even though we have successfully finished data-taking for MEG I
It is IMPORTANT to push through as soon as possible the analysis
of 2012/2013 Data!!!! - before people get more & more involved in MEG 2
and more & more of the detector gets irreplaceably dismantled
Points that still need to be checked:
• Full understanding of magnetic field/ alignment situation
concerning the old problem Michel US/DS edge asymmetry (shift)
– even if within uncertainty
• Relative alignment of detectors (calorimeter, target, chambers)
• Angular acceptance, especially around 90° (hole)
• Are there further improvements in the algorithms that can be made – should not
be forgotten as this this could also be useful for MEG 2!!!
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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Some of the “Highs” & “Lows” Encountered!
MEG experienced - 2 Earthquakes during Beam Commissioning in 2004 & 2005
2005 felt “strongly” in beam barrack! even though only Mag. 4.1
– epicentre village of Mönthal approx. 5Km from Brugg
Swiss Epicentres 1996 - 2011
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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Fire & Water
1 COBRA PS-Fire 2005
fire-brigade + police +
½ of PSI in area!!!
Unfortunate coincidence
of missing protection
System & false trigger causing
Energy dump of Normal
Conducting COBRA Magnet
to the over load resistor!
2 Cavern Electrical Fire – smell noticed by Gianluigi
while Shift check 29/11/2008 . Bad high-resistance
connection at i/p to power distributor 125A
3 2x Overflow of Air-conditioning System
Condense water –over-flowed platform &
ran on top of COBRA Power Supplies “ON”!!¨
- Area check allowed us to Switch OFF quickly
without causing damage 19/8/201 (Hot humid summer)
-- installed large tray-system + overflow recipient system
4
Peter-Raymond Kettle
Quadrupole cooling-water hose broke – flooded front-part of PiE5
area – noticed during parasitic run – no damage
MEG Fukuoka Meeting October 2013
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Human Error!!!
1 Muon Target Broken – through overtiredness (PRK) 8/7/2010
Muon Target snapped-off with
C-W driven Insertion System
Highlight!!! we could plan, execute an efficient replacement
Manual-override done!!!!
within only 7 days because of the efficient on-site experts (DC-group)
2
Insertion System Window 20 μm EVAL-foil destroyed when CEX LH2-target inserted
too far 1/9/2011
Again an efficient repair only took
1 Day
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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Many High’s Also… too many
to list…
Trigger+DAQ
Offline/Analysis
Acc.
Mott Acc.
Acc.
BGO
Peter-Raymond Kettle
CEX
Acc.
Ser
MEG Fukuoka Meeting October 2013
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What have we Learned?
Be PREPARED for the UNEXPECTED …. – MURPHY is right!!!
“The Law of Conservation of Problems” DOES HOLD
A GOOD “Precision” EXPERIMENT depends on:
• A Good Team that work well together – not self evident amongst an International
Collaboration
• A Team that is able to discuss, compromise and be creative
• A clear set of Rules
• Frequent Discussions & being open to new ideas
• A excellent group of “experts” + infrastructure support groups at the Institutes
& especially at the Host Lab.
• The means of performing extensive monitoring & calibration tasks
MEG has managed this …. We should continue to improve things…
READY for MEG 2
Peter-Raymond Kettle
MEG Fukuoka Meeting October 2013
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