diamond beam conditions monitor for atlas (h. pernegger, cern)
DESCRIPTION
Diamond Beam Conditions Monitor for ATLAS (H. Pernegger, CERN). People involved sofar from ATLAS Inner Detector. JSI, Ljubljana G. Kramberger, I. Mandi ć, M. Zavrtanik, V. Cindro, M. Mikuz CERN H. Pernegger Fotec, Wiener Neustadt E. Griesmayer, H. Frais-K ö lbl. - PowerPoint PPT PresentationTRANSCRIPT
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Diamond Beam Conditions Monitor for ATLAS
(H. Pernegger, CERN)
H. Pernegger, CERN, RD42 coll. Meeting May 2004
People involved sofar from ATLAS Inner Detector
JSI, Ljubljana G. Kramberger, I. Mandić, M. Zavrtanik, V. Cindro, M. Mikuz
CERN H. Pernegger
Fotec, Wiener Neustadt E. Griesmayer, H. Frais-Kölbl
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Part of the ATLAS Radiation Monitoring System
Instantaneous Beam Condition Monitor – BCM
Draft EDMS document ATL-IC-ES-0012
Integrating – on-line Total Ionization Dose - TID Non-Ionizing Energy Loss – NIEL Thermal Neutrons
EDMS document in preparation
Integrating – off-line TLD – not discussed today
H. Pernegger, CERN, RD42 coll. Meeting May 2004
ATLAS BCM goal
Goal of the BCM detector system inside the ATLAS Inner Detector
Monitor normal operation conditions Measure rate of collision Measure background rate close to vertex
Protection Detect early signs of beam instabilities Issue warning and alarm signals for equipment protect Input to ATLAS Detector Safety system and LHC beam abort
H. Pernegger, CERN, RD42 coll. Meeting May 2004
ATLAS BCM - beam loss scenarios
Simulations of beam orbits with wrong magnet settings (D. Bogdan) exhibit scenarios with beam scrapping TAS
Time constants of D1 & D2 dipoles large Can abort beam if detected early
H. Pernegger, CERN, RD42 coll. Meeting May 2004
ATLAS BCM during normal running
Time-Of-Flight measurement to distinguish collisions from back ground
Time difference
12ns
Need to measure single MIPs fast!
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Timing of Hits on Collimators
2x4 detector stations, symmetric in zTAS events: Δt = 2z/cInteractions: Δt = 0, 25, … ns
H. Pernegger, CERN, RD42 coll. Meeting May 2004
CMS simulations of 7 TeV p on TAS
From M. Huhtinen
~ MIPs/cm2 per proton(ATLAS simulations by M Schupe in progress)
Zoom on ID
H. Pernegger, CERN, RD42 coll. Meeting May 2004
ATLAS BCM requirements
Distinguish TAS events from interaction events Installation at t = 12.5 ns -› z = 3.75 m Rise-time < 1 ns Pulse-width < 3 ns Base-line restoration < 10 ns
Single MIP sensitivity S/N for MIP’s 10:1 before irradiation
H. Pernegger, CERN, RD42 coll. Meeting May 2004
BCM installation in ATLAS Pixel Support
BCM mounting points
Pixel support tube: mid crucifix at z = 1838 mm, r > 100 mmDetectors to be mounted at 45 degrees
Cables: 4 mm coax up to PP1, 8 mm to USA15 HV, LV: custom Kapton insulated shielded TP Routing through single pixel phi sector/side
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Detector 90Sr source test at CERN
90Sr sourcePb collimator
Diamond on support
Scintillator
Diamond detector w =470 µm, CCD ~ 200 µmHV Bias 1000 V
Different versions of FE electronics from Fotec 500Mhz (40 dB) (2 stages) 1 Ghz (60 dB) (3 stages)
LeCroy 1 GHz scope
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Readout for characterization with fast current amplifier
Based on LabView
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Diamond + electronics Tests in Testbeam MIP signal (testbeam & Sr90 source)
after 16m of cable perpendicular to beam, double diamond assembly Rise time 900ps, FWHM = 2.1ns
SNR = 7.3:1
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Preliminary Detector & Electronics Tests: Sr90
MIP signal in CDS 113 Perpendicular Tested with
source in Lab Results: “ENC” = 1400 e- SNR = 5.4:1
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Amplifier radiation test in Ljubljana
Tested 1 stage of 1 GHz amplifier (20dB)( test of 500MHz just started)
Bi-polar InGaP transistorIrradiated to Φeq = 1, 5, 10 x 1014 n/cm2 in reactor
Verdict:Amplifier still usableafter 1015 n/cm2
H. Pernegger, CERN, RD42 coll. Meeting May 2004
BCM Logic SchemeADC-> Intensity
TDC->TOFWarning/Alarms
H. Pernegger, CERN, RD42 coll. Meeting May 2004
Finalizing design of FE-end part Continue with diamonds back-to-back assembly & amplifier
irradiation Finalize required diamond material parameters Optimize amplifier design (S/N 10:1)
Started to look at Integration aspects Mounting of detector + FE electronics Design of readout logic
ATLAS BCM Next steps