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 zJSI, Ljubljana uG. Kramberger, I. Mandić, M. Zavrtanik, V. Cindro, M. Mikuz zCERN uH. Pernegger zFotec, Wiener Neustadt uE. Griesmayer, H. Frais-Kölbl

H. Pernegger, CERN, RD42 coll. Meeting May 2004 Part of the ATLAS Radiation Monitoring System zInstantaneous uBeam Condition Monitor – BCM Draft EDMS document ATL-IC-ES-0012 zIntegrating – on-line uTotal Ionization Dose - TID uNon-Ionizing Energy Loss – NIEL uThermal Neutrons EDMS document in preparation zIntegrating – off-line uTLD – not discussed today

H. Pernegger, CERN, RD42 coll. Meeting May 2004 ATLAS BCM goal zGoal of the BCM detector system inside the ATLAS Inner Detector zMonitor normal operation conditions uMeasure rate of collision uMeasure background rate close to vertex zProtection uDetect early signs of beam instabilities uIssue warning and alarm signals for equipment protect uInput 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 zTime-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 z TAS events: Δt = 2z/c Interactions: Δt = 0, 25, … ns

H. Pernegger, CERN, RD42 coll. Meeting May 2004 CMS simulations of 7 TeV p on TAS From M. Huhtinen ~ MIPs/cm 2 per proton (ATLAS simulations by M Schupe in progress) Zoom on ID

H. Pernegger, CERN, RD42 coll. Meeting May 2004 ATLAS BCM requirements zDistinguish TAS events from interaction events  Installation at  t = 12.5 ns -›  z = 3.75 m uRise-time < 1 ns uPulse-width < 3 ns uBase-line restoration < 10 ns zSingle MIP sensitivity uS/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 mm Detectors 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 90 Sr source test at CERN 90 Sr source Pb collimator Diamond on support Scintillator Diamond detector w =470 µm, CCD ~ 200 µm HV 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 zBased on LabView

H. Pernegger, CERN, RD42 coll. Meeting May 2004 Diamond + electronics Tests in Testbeam zMIP signal (testbeam & Sr90 source) uafter 16m of cable uperpendicular to beam, double diamond assembly uRise time 900ps, FWHM = 2.1ns SNR = 7.3:1

H. Pernegger, CERN, RD42 coll. Meeting May 2004 Preliminary Detector & Electronics Tests: Sr90 zMIP signal in CDS 113 uPerpendicular uTested with source in Lab zResults: z“ENC” = 1400 e- zSNR = 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 transistor Irradiated to Φ eq = 1, 5, 10 x n/cm 2 in reactor Verdict: Amplifier still usable after n/cm2

H. Pernegger, CERN, RD42 coll. Meeting May 2004 BCM Logic Scheme ADC-> Intensity TDC->TOF Warning/Alarms

H. Pernegger, CERN, RD42 coll. Meeting May 2004 zFinalizing design of FE-end part uContinue with diamonds back-to-back assembly & amplifier irradiation uFinalize required diamond material parameters uOptimize amplifier design (S/N 10:1) zStarted to look at Integration aspects uMounting of detector + FE electronics uDesign of readout logic ATLAS BCM Next steps