Download - Cathode Strip Chambers Status Report
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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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22 Sept. 2008 G. Rakness (UCLA) 3
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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22 Sept. 2008 G. Rakness (UCLA) 5
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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22 Sept. 2008 G. Rakness (UCLA) 6
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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22 Sept. 2008 G. Rakness (UCLA) 8
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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22 Sept. 2008 G. Rakness (UCLA) 10
3-Muon Event in the CSC’s
http://www.nuhep.northwestern.edu/~schmittm/CMS/RESULTS/results.html
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22 Sept. 2008 G. Rakness (UCLA) 11
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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22 Sept. 2008 G. Rakness (UCLA) 12
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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22 Sept. 2008 G. Rakness (UCLA) 13
Collimator dump “Monster” CSC event
Reconstructed segments from Local DAQ data…
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22 Sept. 2008 G. Rakness (UCLA) 14
Data Analysis
Halo muons: angles of muons and beam structure
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22 Sept. 2008 G. Rakness (UCLA) 15
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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22 Sept. 2008 G. Rakness (UCLA) 16
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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22 Sept. 2008 G. Rakness (UCLA) 22
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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22 Sept. 2008 G. Rakness (UCLA) 27
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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22 Sept. 2008 G. Rakness (UCLA) 28
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)