LHC plans Tues evening power tests Wed injector

LHC plans • • Tues evening: power tests Wed: injector tests up to the transfer lines Fri: repeat “handshake” test Sat: Ready to inject beam in the machine (this was originally scheduled for Monday) – Inject one bunch of 5 E+9 protons to a (closed) collimator, splash it, then move on. . . – CSC should be in HV=STANDBY for splashes • Expect ~3 weeks of commissioning before stable beams… – LHC will be circulating with single (pilot) bunch for “some time” (start with flat machine with ALICE+LHCb off, CMS+ATLAS on…) – We will need to be ready for collisions on a very short timescale… 15 Feb 2011 G. Rakness (UCLA) 1

CMS activities • Currently in “continuous running” with cosmic rays – Dealing with the cooling in tracker and pixels has taken them longer than they had expected • The hope had been to run with tracker + pixels for several days to study alignment with cosmic rays… – Tracker was in last night… They are almost there… • Many subdetectors are struggling to understand their L 1 A timing… – Recall, there was a recabling between the TTCci and TTCex modules which was expected to reduce the L 1 A latency by 1 bx • CSC confirmed the 1 bx shift in L 1 A timing in January… • … it has been corrected in the Local Trigger Control module for local running • … it has been corrected in the Global Trigger for global running 15 Feb 2011 G. Rakness (UCLA) 2

AFEB timing from Local DQM Cosmics run 146787 (27 Sept 2010) Cosmics run 157891 (15 Feb 2011) (re-)Confirmed: The L 1 A timing shifts from the TTCci TTCex recabling have been properly corrected at the Global Trigger 15 Feb 2011 G. Rakness (UCLA) 3

CSC Activities • Last week – CSCTF firmware updated – Upgraded to XDAQ 10 – Followed upgrade and rollback of TTC software – Final CLCT muonic timing iteration before collisions (see next page) 15 Feb 2011 G. Rakness (UCLA) 4

Average value of ALCT in CLCT match window per chamber Cosmic ray data run 157912 taken 15 Feb 2011 This distribution has the following features: C. Farrell (UCLA) • • No CSC below 2. 5 All CSC’s within 1 bx of 3 This is the timing we want to start 2011 collisions… Plan when collisions come: 1. Confirm good AFEB – ALCT – CSCTF timing 2. Tune CLCT timing based on collisions, as needed 15 Feb 2011 G. Rakness (UCLA) 5

CSC “To Do” before collisions • Global runs: CSCTF needs to test their data format zerosuppression (in order to not fill up the buffer of the DDU) – Needs coordinated CMSSW versions at HLT, DQM, and offline… – Needs backup plan to reduce data payload in case it fails • During Beam development, before collisions… – On online computers, delete operating system and reinstall with quattor • Karoly is the CSC point person for this – Update to EMUlib 10. 1 • Jinghua and Karoly are point people… – Calibration runs? • Either during beam development or during technical stops during collisions… – Automatically deal with HV trips • Evaldas is the point person… 15 Feb 2011 G. Rakness (UCLA) 6

And now for something completely different… Gains… 15 Feb 2011 G. Rakness (UCLA) 7

Recall: Use fitted peak position of charge in 3 x 3 bin as a measure of gain • Simulation out of the box looks like this Fit of the form: A + B/cos( ) … to reflect dependence on path length… Does a good job of describing the simulation 15 Feb 2011 G. Rakness (UCLA) 8

Station 3 simulation looks very similar… 15 Feb 2011 G. Rakness (UCLA) 9

Data does not look the same… • • 15 Feb 2011 G. Rakness (UCLA) Difference between ring 1 and ring 2… Lots of wiggles in the chamber distribution… 10

Talked to Tim • He doesn’t quite know what to do with this… • Some questions he had… – What do FAST site results know about gains? – Are there HV dips in the simulation? • I want to just see if I can make the simulation match the data, and see if the widths become similar… • He thinks it might be a good thing to show at a CSC Operations+DPG meeting 15 Feb 2011 G. Rakness (UCLA) 11

Greg “To do” Wed: Thurs: • Begin extended cosmic ray Global Run • L 1 Trigger Technical Coordination Meeting Fri: • Run Meeting • Get Karoly to talk with DAQ folks about reinstalling CSC computers from scratch • Find out how HV automation is going Near term • Talk to Andrey about gains • Work on gains • Update CSC DQM instructions to reflect new DQM layout 15 Feb 2011 G. Rakness (UCLA) 12

Greg Longer Term “To do” • Online software – Put ALCT firmware database check into ALCT firmware write routine – Resurrect ALCT self-test – ALCT hot-channel mask in xml file/config DB – Expert config check – Configuration check with separated DMB and CFEB 15 Feb 2011 G. Rakness (UCLA) 13