Status at CERN 8 fills  ~500/pb since last Tuesday – ~5.3/fb delivered, ~4.8/fb recorded, … SEU workshop on Friday – Different detectors have different.

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Presentation transcript:

Status at CERN 8 fills  ~500/pb since last Tuesday – ~5.3/fb delivered, ~4.8/fb recorded, … SEU workshop on Friday – Different detectors have different solutions Often requiring VME… No mechanism to do this in CMS… – CSC made the request for periodic Hard Resets First test today with most detectors OFF Next test with all detectors in… or maybe just go for the gusto and do a Hard Reset every 15 minutes towards the end of the fill (just to get folks used to it) 18 Oct 2011G. Rakness (UCLA)1

Looking at special LHC fills… LHC provided two special fills with different conditions – Fill 2186 = “25ns fill” = 25ns bunch spacing with low intensity/bunch (in this talk use run ) – Fill 2201 = “high pileup (PU) fill” = 1 colliding bunch with large intensity (in this talk use run ) For these fills, CMS configured the trigger differently than “normal” – Different mixtures of zero-bias, jets, muons – Moreover, in the high pile-up fill, the RPC were prefiring (mistake) As well, offline reconstruction of these data was different than normal… – I don’t even know if the 25nsec fill has been reconstructed yet or not… – Thus, for today, we compare plots from Online DQM with those from a normal collision run (run ) 18 Oct 2011G. Rakness (UCLA)2

18 Oct 2011G. Rakness (UCLA) 3 Run = “Normal” with 50nsec spacing  Recall, CSC’s are readout with an L1A-CLCT coincidence in a window (–3bx, +1bx) wide (in order to readout halo muons) Run = 25nsec spacing  With this window, one can easily resolve muons from 3 early and 1 late collisions (total of 5) which do not cause an L1A… The CSC timing data are available, but not yet used in muon reconstruction Run = high pileup  With regards to the timing, the high pileup fill is clean. I guess this means the RPC pre-firing did not affect the online DQM results for CSC… TIMING

18 Oct 2011G. Rakness (UCLA)4 Run = “Normal” with 50nsec spacing Run = 25nsec spacing Run = high pileup N wires / L1A No striking differences

18 Oct 2011G. Rakness (UCLA)5 Run = “Normal” with 50nsec spacing Run = 25nsec spacing Run = high pileup N strips / L1A No striking differences

18 Oct 2011G. Rakness (UCLA)6 Run = “Normal” with 50nsec spacing Run = 25nsec spacing Run = high pileup N RecHits / L1A No striking differences

18 Oct 2011G. Rakness (UCLA)7 Run = “Normal” with 50nsec spacing Run = 25nsec spacing Run = high pileup N RecHits / segment No striking differences

Why do the distributions… a)… not look different from each other? – (except for the timing) b)… not look different from a “normal” run? – (except for the timing) 18 Oct 2011G. Rakness (UCLA)8

CSC’s are an empty detector 18 Oct 20119G. Rakness (UCLA) E. Juska (FNAL) N collisions / crossing ( = “pileup”) N LCT per ME1/1 chamber Integrated over all ME1/1 chambers, there are ~0.5 LCT’s (segments) per crossing when the pileup is ~30…

All these fills give ~equal “pileup” for CSC Run = 50ns “normal” fill – N collisions / crossing ~ 14 (see backup slides) – N bunches / L1A = 2 (see page 2) – Total number of LCT’s in ME1/1 per L1A is 0.45 Run = 25ns fill – N collisions / crossing ~ 7 – N bunches / L1A = 5 – Total number of LCT’s in ME1/1 per L1A is 0.55 Run = high pileup run – N collisions / crossing ~ 30 – N bunches / L1A = 1 – Total number of LCT’s in ME1/1 per L1A is Oct 2011G. Rakness (UCLA)10

Conclusions The combination of (CSC readout conditions  bunch spacing  bunch intensity) turned out to make the pileup conditions for CSC ~equal for… – The 25nsec fill – The high pileup fill – Normal fills The CSC is essentially an ~empty detector under any LHC conditions – More study is needed to look for effects on, e.g., multiple muons… 18 Oct 2011G. Rakness (UCLA)11

To do CSCTF DQM instructions into CSC DQM twiki – Must finish this by tomorrow’s Ops+DPG meeting Gas gain corrections  FINISH into CMSSW_5_0 – Continue to press Tim to tell me how to organize the overall normalization Make a summary of SEU meeting – Outline plan to follow up Line up DOC’s for 2012 – Who of these can be lined up for DPG work? Operations Management job description to Misha and Evaldas Write CSC Operations overview talk for Madrid – Make practice talk for next Wednesday’s Ops+DPG meeting 18 Oct 2011G. Rakness (UCLA)12

Backup: How to compute fill quantities Pileup computed with the LHC calculator – Using fill information from the SuperTable at namely… – Emittance – N protons / bunch = (Total number of protons / number of bunches) –  * 18 Oct 2011G. Rakness (UCLA)13