BGV Status and Plans Full collaborator list https

BGV Status and Plans

Full collaborator list: https: //twiki. cern. ch/twiki/bin/view/BGV/Project_Organization#Author_List

Tracks from beam-gas interactions to reconstruct beam spot, Ne @ 10 -8 mbar injected at interaction volume Should allow beam spot size (and hence ε) measurements with precision <10% (5 minutes integration time) Demonstrator built around Beam 2, in Pt 4 Expect first real-time beam profile measurements for 2017 pp runs

https: //twiki. cern. ch/twiki/pub/BGV/Presentations/2015_11_1 9 --BITech. Board. pdf https: //twiki. cern. ch/twiki/bin/view/BGV/Web. Home

Demonstrator Status Detector fully commissioned Sci. Fi detector planes Read-out chain and CPU farm Trigger system Control and DAQ s/w Cooling system functional, detector @ -25℃ Dead channels ≤ 1% Off-line analysis in good progress Next steps Offline analysis: high precision track and vertex reconstruction Gas injection system operational Implement analysis software in the BGV online CPU farm for real-time beam profile measurement Several data-taking campaigns during 2016 with various beam conditions Establish data logging and measurement publishing towards CCC Further upgrades for BGV demonstrator: • Faster trigger electronics + extra scintillators for optimal Beam 2 identification • Additional fast detector plane (time resolution ~40 ps) for z profile reconstruction

A typical entry from the BGV e-log:

L 0 Counters 1500 V 1800 V Scintillator Amplitudes Veto Counters Scintillator Relative timing

TELL 1 : Cluster finder (zero-suppression) HLT farm : Full reconstruction program Currently reading out non zero suppressed data to define optimal algorithms (hence R/O rate limited to ~ 1 KHz) Full (16 blades) HLT farm and ZS data will allow a DAQ rate of ~1 MHz

Cooling fluid leak rate < 200 ml/month : Can safely operate between TSs Next steps: • Incorporate Chiller control in BGV Win. CC system for monitoring and data logging • Dry Air interlock Cooling system Upgrade if lower temperatures are needed: Install closed circuit for C 6 F 14 with heat exchanger and secondary cooling with chiller

6 PIN Diodes measuring directly on detector modules Expected dose ~10 Gy/year (more details: https: //twiki. cern. ch/twiki/bin/view/BGV/Radiation

y ɸ d (Distance Of Closest Approach) x REAL DATA This is a x-y projection of the beam-gas interaction volume. DOCA is calculated in 3 -d and hence one obtains also a POCA (Point of Closest approach) : (x, y, z) Calculation done with respect to (0, 0, z)

Monte-Carlo Simulation Beam @ (1, 0) with σ = 0. 15 mm Blue: Generated, Black: Reconstructed (x, y) Real Data

Real primary vertex position (instead of (0, 0) y 0 ɸ DOCA = x 0 sin(ɸ) – y 0 cos(ɸ) x 0

Beam spot generated @ (0, 0) Reconstructed @ x = 0. 001 mm y = 0. 005 mm Beam spot generated @ (1, 1) Reconstructed @ x = 0. 84 mm y = 0. 81 mm Note: Outliers cause underestimation of (x, y). Need better fitting function or calibration

Beam spot reconstructed @ ~(o. 01 mm, 0. 01 mm) NOTE: No alignment corrections implemented yet

Monte Carlo Simulation Generated σbeam = 0. 15 mm Fitted σbeam = 0. 2 mm Real Data REAL DATA Fitted σbeam = 0. 17 mm (Above distribution is yet an other indication of reconstructed tracks far from the interaction vertex)

L 0 Counters Veto Counters L 0 Confirm • New trigger electronics • CF Discriminators • Delay and coincidence logic (~10 ns coincidence window) • Additional scintillators (L 0 confirm)

For reconstructing the z profile of a beam bunch : need ~60 ps resolution MM: small amplification gap (50 -150 μm) - fast signals (~ 1 ns) - short recovery time (~50 ns) - high rate capabilities (> MHz/cm 2) - high gain (up to 105 or more) Time resolution already achieved: <50 ps Anode can be in the form of wide (~cm) strips to match the BGV geometry To be placed possibly at the L 0 confirm support frame For more details see BE-BI seminar: Micro. Megas detector applications for beam diagnostics https: //indico. cern. ch/event/540799/

Courtesy: O. Girard - EPFL