9 0568 rusack r

70 %
30 %
Information about 9 0568 rusack r

Published on November 20, 2007

Author: Mahugani

Source: authorstream.com

The CMS Electromagnetic Calorimeter:  The CMS Electromagnetic Calorimeter Roger Rusack The University of Minnesota On behalf of the CMS ECAL collaboration Detector Overview:  Detector Overview MUON BARREL CALORIMETERS ECAL Scintillating PbWO4 crystals Cathode Strip Chambers ( ) CSC Resistive Plate Chambers ( ) RPC Drift Tube Chambers ( ) DT Resistive Plate Chambers ( ) RPC IRON YOKE TRACKER MUON ENDCAPS HCAL Plastic scintillator/brass sandwich Goals:  Goals High Resolution calorimetry: Stochastic term 2.7%, Constant term 0.5%, Noise term 150 – 220 MeV. Large volume: 75,848 crystals covering |h| < 2.6. 90.8 tons of crystals or 10.9 m3. Operated inside a 4T magnetic field. In a radiation environment with an integrated dose of: 1013 neutrons/cm2 and 1 kGy at h = 0 to 2×1014 neutrons/cm2 and 50 kGy for h = 2.6. 40 MHz bunch crossing rate. Lead Tungstate Crystals:  Lead Tungstate Crystals Operate at 18o C – Temp dependence = -2.2%/OC. Radiation length – 0.83 cm Molière radius – 2.2 cm. Fast light output – 80% in 25 nsec. Relative Light Yield – 1.3% NaI No long-lived radiation damage. But short-lived metastable color centers created by radiation – careful monitoring Transmission Emission 350 nm Construction Overview:  Construction Overview 10 crystals Submodule Module Barrel 61,200 PbWO4 crystals Readout with 122,400 APD’s Endcap 14684 crystals readout with VPT’s. Preshower:  Preshower Two-layer silicon preshower detector placed in front of the endcap calorimeters 2 Xo absorber 1 Xo absorber 2mm silicon strips to separate g’s from po’s and for vertex identification. Crystals and crystal production.:  Crystals and crystal production. Transmission at 420nm Light Yield All crystals are tested for: Radiation Hardness, Light Yield, Physical Dimensions. Light yield uniformity. Projection is 3o off interaction point - 34 different crystal types. Barrel Crystals are tapered – variation of reponse with origin of the shower. Correct by roughening one surface of the crystal. Photodetection:  Photodetection 4T B-field precludes use of PMT’s.. Avalanche photodiodes in barrel. Vacuum Phototriodes in Endcap Two 5× 5 mm2 APD’s/crystal. Gain – 50. QE – 80% @ 420 nm. Temp sensitivity – -2.4%/ OC. Gain – 10. QE – 15% @ 420 nm. Rad tolerance - <10% at 20 kGy. Operates in high B – field. Readout Overview:  Readout Overview Each crystal has a low-noise, large dynamic range pre-amplifier with three gain outputs each coupled to a separate 40 MHz ADC, to cover the full 50 MeV to 1 TeV range. Level 1 trigger sums are sent every bunch crossing. Data from each crossing is stored until level 1 trigger accept. All data are sent on fiber optic links. Supercrystal Front-end board Data Trigger sums Very Front End board GOH APD MGPA 3 ADC’s Front-End Electronics:  Front-End Electronics Barrel – Grouped into a 5 × 5 crystal array. Endcap – Grouped to match h - f Crystal APD Amplifier *1 Amplifier *6 Amplifier *12 ADC Channel 2 (12bit) ADC Channel 1 (12 bit) ADC Channel 0 (12 bit) 14 bit Channel Data Single channel architecture FE Board 25 Trigger Link Data Link Creation of trigger primitives. Storage of data to level 1 accept. Signal from APD’s ~100 W per trigger tower. Total power on detector ~ 50kA, 300 kW. All front-end electronics in 0.25m process. Optical Data Links:  Optical Data Links All data is sent off detector electronics via 1 GHz Optical links. 10,500 links for whole calorimeter – Data flow: 10 Tb/sec. Radiation hard Off detector Cooling:  Cooling All 0.25 m electronics runs at 2.5V. 0.45 A/channel 1 A/board Radiation hard regulator has a drop out voltage of 1.5V Total power in whole calorimeter ~300 kW Crystal light yield decreases by 2.2%/oC & APD gain decreases by 2.3%/OC. Removing all excess heat is critical for the stable operation of the detector. Cooling:  Cooling Trigger tower on the cooling bars 0.04°C 2 months Approach: isolate crystals and APD’s from electronics. Remove heat from electronics by close coupling with water cooled bars. Crystals and APD’s dT kept to  0.05oC & uniform to 0.2oC. Temperature stability with a 100-channel system last year. Test beam : precalibration:  Test beam : precalibration We cannot test calibrate every crystal with an electron beam. Obtain a first calibration point from component data: crystal light yield, APD & pre-amplifer gain. In situ: Fast intercalibration based on f symmetry in minimum bias events 2% in few hours Energy/momentum of isolated electron from W→ en 0.5% in 2 months Absolute energy scale from Z → e+e- Test Beam LY Labo LY corr s = 4.05% Test Beam LY – Labo LY corr Relative channel calibration can be obtained from lab with a precision of 4 % Monitor Laser System:  Monitor Laser System Three laser system. ND:YLF laser that pumps a Q-switched Ti-Saphire laser to monitor short term variations in the crystal transmission. Pulse with same time structure as the scintillator at a frequency of 440 nm. APD F1 F2 PIN FE Laser S PWO 440 nm 796 nm Laser light injected at the front side of the crystals. Monitoring:  Monitoring Resolution before and after an induced large change in light output. Results from Test beam with final electronics.:  Results from Test beam with final electronics. Resolution(mm) Energy (GeV) 1 mm Energy (GeV) Energy Position 0.6% at 50 GeV. 0.85 mm at 50 GeV. Resolution(%)

Add a comment

Related presentations

Related pages

Fahrradhaus Rusack GmbH & Co. KG - 31515 Wunstorf ...

Fahrradhaus Rusack GmbH & Co. KG - 31515 Wunstorf - Ihr professioneller Ansprechpartner in Sachen Fahrrad, Fahrradbekleidung und Fahrradzubehör!
Read more

Macdonald Rusacks Hotel, St. Andrews, UK - Booking.com

Overlooking the famous Old Course in central St. Andrews, Macdonald Rusacks Hotel features a bar-cafe and stylish champagne bar.
Read more

Wine – Rusack

Wine; Visit; Anacapa Club; News & Events; Press; Accolades; Shop; Cart (0) Menu. Anacapa Ballard Canyon Estate, 2012 View Details. Sold Out. Chardonnay ...
Read more

Syrah – Rusack

Rusack Estate. Varietal: Syrah 86 %, Petite Sirah 14 % Bottle Analysis: Alcohol: 14.2%, pH: 3.52, ta: 0.574 g/100ml. download technical notes (pdf) Syrah
Read more

R Bar Macdonald Rusacks Hotel

Visit our elegant & sophisticated R Bar at Macdonald Rusacks Hotel in St Andrews and enjoy a wide range of champagne, wines, whiskies and cocktails.
Read more

Award-Winning Dining St Andrews | Macdonald Rusacks Hotel

Enjoy award-winning dining at our award-winning restaurant or delicious drinks in our newly refurbished bar at Macdonald Rusacks Hotel in St Andrews.
Read more


Reg. No. 9/2012/0568 Local Government Act 1972 Town and Country Planning Act 1990 G R A N T O F P L A N N I N G P E R M I S S I O N In ...
Read more

Macdonald Rusacks Hotel (St. Andrews) - Hotel Reviews ...

Book Macdonald Rusacks Hotel, St. Andrews on TripAdvisor: See 953 traveler reviews, 271 candid photos, and great deals for Macdonald Rusacks ...
Read more


Our 2013 Rusack Zinfandel opens with delicate aromas of ... 9% Petite Sirah Appellation: Santa Barbara County, ... RUSACK VINEYARDS
Read more

Macdonald Rusacks Hotel - Old Course Experience

Find out all you need to know about Macdonald Rusacks Hotel, one of the hotels available via The Old Course Experience. Guaranteed tee times are available.
Read more