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6/R-018 (CERN)
Felix found another BPM with phase advance of 1:
BPMWB.4R8.B1, to be added to list of known bad BPMs
Piotr finds new BPMs with polarity problem:
see:
http://elogbook.cern.ch/eLogbook/eLogbook.jsp?shiftId=1064126
Already sent to Jorg:
BPMR.6L7.B2
BPMWC.6L7.B2
New:
Horizontal
BPMYA.5L4.B1
BPMWI.A5L4.B1
Vertical
BPM.30r8.B1
BPM.31r8.B1
and BPMs 15-16R3 B1 seem swapped channels.
Piotr used this logbook day without measurements to post his analysis:
http://elogbook.cern.ch/eLogbook/eLogbook.jsp?shiftId=1064151
IR5
40cm beam1 and beam2.
dktqx2.r5 = 1.778341675e-05;
the same magnet needs to go to 2e-5 at 2m. At flattop this correction does not work as good.
IR1
at 40cm
dktqx1.r1 = -3.31e-5;
dktqx2.r1 = -1.25e-5;
again not as good at flattop. At flattop we need about a factor 2...
IP6
Piotr sees compatible with perfect.
IP7
there seems to be probably needs some correction, Piotr uses 3 quads. Error is are not large.
IR8
~perfect, but an unphysical peak in 15L8 (all optics)
######
Ewen
IR5: in average the error source is similar in magnitude than 2012 but clearly different now.
A 2 corrector approach gives slightly better agreement:
q2r5 1.8e-5
q2l5 -0.07e-5
Or increasing a bit more: 1.9e-5 and -0.09e-5 improves further out. -> Check this at flattop.
How to optimize running out of CCC:
-Open GUI with output directory where you can write.
-Import results directory from CCC (need read access) but it is very important to have the same model
-The model can be copied or linked in the terminal
ACTION-> Import results should also import model!!
IR8 (at 40cm in IP1 , 3m in IP8)
Old corrections are very bad!
Two single corrections ktqx2.l8 = -0.1e-4; OR ktqx1.l8 = 0.41e-4; -> To be checked at flattop;
Felix IR6
old corrections too bad!
Corrections questionable -> Check back propagation.
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