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Prototype sPHENIX Calorimeters John Haggerty Brookhaven National Laboratory 110/24/2013.

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Presentation on theme: "Prototype sPHENIX Calorimeters John Haggerty Brookhaven National Laboratory 110/24/2013."— Presentation transcript:

1 Prototype sPHENIX Calorimeters John Haggerty Brookhaven National Laboratory 110/24/2013

2 The sPHENIX Experiment Major upgrade to the PHENIX Experiment at RHIC Primary purpose is to measure jets in heavy ion collisions Measure jet energy using calorimetry Good solid angle coverage (| |< 1, =2 ) Provide a basis for a future detector at eRHIC Study nucleon structure and QCD in nuclei over a broad range of x and Q 2 using deep inelastic polarized ep and eA collisions 2

3 3 Solenoid Magnet HCAL EMCAL 10/24/2013

4 4

5 Calorimeter Requirements Calorimeter Requirements Large solid angle coverage (± 1.1 in, 2 in ) Moderate energy resolution EMCAL ~ 15%/E HCAL ~ 75 %/E (single particle), ~100 %/E (jet) Compact (for EMCAL small R M, short X 0 ) Physically small (dense) – occupies minimal space High segmentation for heavy ion collisions Hermetic Projective (approximately) Readout works in a magnetic field Low cost 5

6 EMCAL Tungsten-SciFi Accordion 6 Scintillating fibers 1.0 mm Pure tungsten metal sheets ( ~ 19.3 g/cm 3 ) Thickness: 2x1.0 mm Epoxy (~ 0.1 mm) Tapered thickness pure tungsten metal plates with scintillating fiber layer glued in between X 0 = 5.3 mm R M = 15.4 mm 2 W plates/layer 0.6 X 0 sampling ~ 10 cm 18 X 0 SBIR

7 EMCAL prototype Test of simpler tilted plate design 1 mm W + 1 mm scintillator 10/24/20137

8 8 Towers are formed by Light Collection Cavities 3x3mm SiPM 22 mm 8x8 tower readout board with 2x7 light collection cavities 3D printed light collection cavities White reflecting epoxy between plates

9 9 Light Yield From Fibers 500 /MeV energy deposit in scintillator 8 % sampling fraction 40 x 10 3 /GeV (E dep in calorimeter) Light Collection Factor (2%) 800 /GeV SiPM PDE ~ p.e./GeV 7%/E contribution to energy resolution Light yield from prototype measured with cosmic rays and PMT readout

10 sPHENIX Hadron Calorimeter 10 Steel plates with scintillating tiles parallel to beam direction Steel serves as flux return Steel plates are tapered Sampling fraction changes with depth Divided into two longitudinal sections Measure longitudinal center of gravity to correct for longitudinal fluctuations Plates tilted in opposite directions to avoid channeling 4 inner and 4 outer plates joined together to form one section 60 cm 3.5 abs 30 cm 1.5 abs

11 HCAL Readout 11 Scintillating tiles with WLS fibers embedded in grooves Fibers read out with SiPMs T 2x11 segments in ( =0.1) 64 segments in ( =0.1) 1408 x 2(inner,outer) = 2816 towers 2x11 scintillator tile shapes Inner Outer Inner readout (~10x10 cm 2 ) Outer readout SiPMs + mixers 8 readout fibers per tower

12 HCAL Scintillator Tiles Manufactured in Russia 12 White reflective coating (chemical etching) WLS fiber embedded in grove in tile (top and bottom)

13 10/24/ Light Collection for HCal

14 14 HCAL Tile Measurements at the University of Colorado Light output and uniformity measurements of scintillating tiles Top fiber Light Yield ~ 18 p.e./mip (measured with 90 Sr) Bottom fiber S.Beckman

15 HCAL prototype 1510/24/2013

16 Beam Test of the Combined EMCAL/HCAL Prototypes 16 Scheduled to take place in the MT6 test beam at Fermilab in Feburary 2014

17 10/24/ sPHENIX

18 18 HCAL Prototype Construction at BNL

19 19 Readout Electronics EMCAL Prototype readout board HCAL Readout Electronics System

20 Electronic chain test 2010/24/2013

21 Calorimeter beam test 2110/24/2013

22 Summary 22 PHENIX is planning a major detector upgrade to replace its existing Central Arm Spectrometer with a new calorimeter system consisting of an electromagnetic and hadronic calorimeter These new calorimeters will enable a detailed systematic study of jets produced in heavy ion collisions at RHIC to study the QGP near its transition temperature Both calorimeter designs are well under way and prototypes of both calorimeters are currently under construction A combined test of both prototype calorimeters is planned to take place at Fermilab in February of next year


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