cathode strip chambers status report
DESCRIPTION
Cathode Strip Chambers Status Report. Greg Rakness University of California, Los Angeles. CMS week plenary session CERN 22 Sept. 2008. Sources of Muons Used for CSC Commissioning (I). Cosmic rays Expansion of the system from few 468 chambers - PowerPoint PPT PresentationTRANSCRIPT
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22 Sept. 2008 G. Rakness (UCLA) 1
Cathode Strip Chambers
Status Report
Greg RaknessUniversity of California,
Los Angeles
CMS week plenary sessionCERN
22 Sept. 2008
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22 Sept. 2008 G. Rakness (UCLA) 2
Sources of Muons Used for CSC Commissioning (I)
• Cosmic rays– Expansion of the system from few 468
chambers• Asynchronous muons over the full angular
spectrum
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Intra-CSC Trigger Synchronization Cosmic Rays
ChamberId = SectorId*100+StationId*10+CSCID
Synchronize chambers on one endcap w.r.t. a reference chamber on that endcap
Synchronization of (most) chambers to better than 0.2bx
ME+
ME
D. Wang (UF)
Use chamber overlaps with cosmic rays to synchronize the chambers to each other on average
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22 Sept. 2008 G. Rakness (UCLA) 4
Run 57795 (CRUZET-4):
ME+1 ME+2 ME+3 ME+4
ME3 ME4ME2ME1
Recall: Chamber Illumination with Cosmic Rays
Plots by A. Kubik and M. Schmitt (Northwestern)
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Sources of Muons Used for CSC Commissioning (II)
• Single beam bunch in LHC (~2x109 protons)– Beam passes through CMS beam
dump• Synchronous muons approximately parallel
to beam
– Beam captured several turns• Synchronous muons approximately parallel
to beam
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CSC “Halo Muon” Trigger Single Beams
x
ME+ ME
TOF 2 bx
(Beam-1) halo muon
Normal proton
collisions
LHC mode: both endcaps trigger simultaneously on IP muons
“Halo Muon” trigger: CSC Track Finder selects tracks with small
• Trigger on outgoing endcap (i.e., ME for Beam-1)
Approximate timing of muons from IP
• [Note: for first beams, the incoming endcap was also included in the trigger (delayed by 2bx). This is no longer true…]
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Chamber Illumination: Beam-2 Halo
http://lotus.phys.northwestern.edu/~kubik/newdata/run62096/
Run 62096:
ME4ME3ME2ME1
ME+1 ME+2 ME+3 ME+4
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Beam Halo Event through Both Endcaps
More event displays are stored athttp://www.nuhep.northwestern.edu/~schmittm/CMS/TEMP/event_displays/
Run 62384Event 56199
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22 Sept. 2008 G. Rakness (UCLA) 9
Zoom in..
Most beam halo events look like this…
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3-Muon Event in the CSC’s
http://www.nuhep.northwestern.edu/~schmittm/CMS/RESULTS/results.html
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Sources of Muons Used for CSC Commissioning
• Single beam bunch in LHC (~2x109 protons)– Dumps into collimators ~150m away
from CMS• Synchronous “splashes” of muons + stuff
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Coincident with collimator dumps:“Monster” CSC events
• Some numbers:– Event size 3MB (normal size ~few kB)– 160k/200k strips with data
• Causes (irrecoverable) error somewhere in CSC DCC Global DAQ Myrinet chain – Forced to stop and restart run…
• Local DAQ took event with no errors – Local readout through different path…
• To avoid this DAQ problem: remove CSC from Global DAQ during beam dumps into upstream collimator
Under investigation…
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Collimator dump “Monster” CSC event
Reconstructed segments from Local DAQ data…
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Data Analysis
Halo muons: angles of muons and beam structure
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Reasonable description of beam ON data: combination of • beam halo • cosmic rays
(Separate normalization of blue and black curves not quantitative…)
Cosmic rays
Beam halo
Single beam: reconstructed track angle w.r.t. the transverse plane
http://www.nuhep.northwestern.edu/~schmittm/CMS/RESULTS/results.html
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Cosmic rays do not care about beam structure…
~ Cosmic rays~ Beam halo
A. Kubik (Northwestern)
Separate Beam Halo and Cosmic Rays by Track Angle
look at the BX distribution
Beam halo muons come in single bx number, as expected…
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Beam-2: Distribution of BX valueshttps://cmsdaq.cern.ch/elog/shift/3528
For BEAM-1 (19 Sept):
“… CSC remains [the] reference…” I.Mikulec (Trigger elog 680)
For BEAM-2 (10 Sept):
CSC Halo measured to be in time with HF technical trigger…
Delayed BPTX2 to be in time with HFTT and CSC Halo…
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Data Analysis (II)
Chamber performance with Beam Halo Muons
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Number of hits on a reconstructed segment.In MC we assume 100% efficiency for fiducial hits.
A. Kubik (Northwestern)
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Efficiency to obtain a recHit in each given layer, for all chambers in ME+2/2
S. Stoynev (Northwestern)
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Towards Alignment Constants…
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Endcap z-positions with magnet at 0T, 3T
First reconstructions:• ME+2,3,4 stations at
B=0T, 3T• Simultaneous Rφ fit for
all SLMs in ME+2, ME+3 at B=0T, 3T
Compression comparable to MTCC at equivalent
magnetic field
XSLM [mm]
ZC
MS [
mm
]
• Integration of Barrel-Endcap-Link systems underway• Initial integrated model of link+endcap available
• Provide an integrated, global muon geometry• Upload geometry in ORCON/ORCOFF to be used in reconstruction • Combine/Compare with track-based alignment
G. Gomez (Cantabria)
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Track Based AlignmentJ. Pivarski (Texas A&M)
Use simultaneous solution of fits to residuals from overlapping regions to align chambers to each other (For details, see alignment meeting Wednesday)
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Summary Q: Is CSC ready for beam?
A: Yes (but we still have a lot to do!)
Online DQM “EMU status00” plot: Green = system able to provide at least two muon stubs
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Backup slides
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LHC Beam Notation
CMS
+x
+z+y
LHC “Beam 1”:
• Enters p5 from p4
• Traverses CMS from ME+ to ME
LHC “Beam 2”:
• Enters p5 from p6
• Traverses CMS from ME to ME+
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CSC Inter-Endcap Synchronization with HE
ME+ and ME endcaps synchronized with each other
Avg = 6.3 Avg = 5.2
Avg = 5.1Avg = 5.2
Accurate TTC CCB fiber lengths implemented (Jay Hauser
[UCLA])
Before:CRUZET-3
After: CRUZET-4
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Separate beam halo and cosmic rays by track angle (previous slide)
look at the BX distribution
The beam halo comes mostly at a single bx, while the cosmic rays
are everywhere, as expected.
(zoom-in)
~ Cosmic rays
~ Beam halo
A. Kubik (Northwestern)