Experiences at MTBF José Repond Argonne National Laboratory CALICE Meeting, ANL, 17 – 19 March, 2008.

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Presentation transcript:

Experiences at MTBF José Repond Argonne National Laboratory CALICE Meeting, ANL, 17 – 19 March, 2008

T970 Goal Prove concept of DHCAL Validate technical approach (RPCs, GEMs and electronic readout) Hardware Up to 9 layers of RPCs (2304 channels) Hanging file structure Gas rack, gas tank Electronics rack High voltage modules DAQ computer Trigger Conicidence of 2 19 x 19 cm 2 paddles and (Čerenkov) Čerenkov → e + Veto of Č 1.or.Č 2 → π,μ Loss of factor of 2 in efficiency (Better to include Čerenkov into data stream)

MoU with FNAL – signed on July 16, 2007 Moved to FNAL – July 18 th Setup of experiment – July 19 th (am) Safety review – July 19 th (pm) Safety approval – July 20 th (am) First beam – July 20 th (pm) First events – July 21th (am) Shutdown – starting August 4 th (pm) Record Time A short history

Beams and Rates Efficiency of RPCs drops for rates > few 100 Hz/cm 2 Rates adjusted with collimators and focussing elements Proton beam at 120 GeV/c without beam blocker → at least 10,000 Hz Proton beam at 120 GeV/c with beam blocker → ~ Hz (10 11 ppp) Secondary beams at MomentumRough e/( μπ) fractions Rates 16 GeV/c0.5/1Initially 5000 Hz, reduced to 400 – 100 Hz (defocusing) 8 GeV/c1/1300 Hz (4 x 10 9 ppp) 4 GeV/c2.5/1120 – 400 Hz (requested increase in rates) (3 x 10 9 ppp) 2 GeV/c9/1250 Hz (8 x 10 9 ppp) 1 GeV/c6/1 (?)500 Hz (4 x ppp)

Beams Spot Proton beam at 120 GeV/c with beam blocker Secondary beams 16 GeV/c π/μπ/μ e+e+ 4 GeV/c 1 GeV/c Not clear how much focusing/defocusing was done to adjust rates

Problems Scanning table Sagging → solution Humidity Rain into the bulding (roof being repaired) Very humid conditions → changes in the surface resistivity → a few HV break downs Noise Resetting slow control constants → running slow control every 30 seconds → new grounding scheme No show stoppers

Conclusions Overall Very positive experience FNAL crew most helpful and accomodating Beams reliable Rare and short interruptions (Tevatron shots…) Goals? Met!