Status of EIC Calorimeter R&D at BNL

1. Status of EIC Calorimeter R&D at BNL S.Boose, J.Haggerty, E.Kistenev, E,Mannel, S.Stoll, C.Woody PHENIX Group E.Aschenauer, A.Kiselev SPIN and EIC Group EIC Detector R&D Committee Meeting January 13, 2014

2. Progress Since Last Meeting (June 2013) • Studied response of calorimeter design with Monte Carlo • Completed construction of new EMCAL prototype • Completed design of readout electronics, fabricated all preamps, and started testing readout system • Designed calibration system and installed components in prototype • Designed and built rotating support stand to study response of prototype as a function of angle in test beam • Started testing prototype with cosmic rays at BNL • Preparing for beam test at Fermilab in February 2014 C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

3. EMCAL Tilted Plate Configuration(Flat plates - No Accordion) Energy Resolution vs Tilt Angle 2 mm W + 1 mm fiber 1 mm W + 1 mm fiber Conclusion: 1mm/1mm sampling reduces dependence on tilt angle and improves performance A.Kiselev C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

4. Tilted Plate vs Accordion • Tilted flat plates and accordion strive to accomplish the same thing: improve longitudinal sampling and prevent channeling • Accordion is actually more desirable since it keeps the shower more compact in the transverse dimension • Problem with W-SciFi accordion is that it is difficult to make a “high frequency” accordion with fibers (must respect bending radius) and it is difficult to control the shape and tolerances of accordion W plates • Optimum may be a combination of a slight accordion plus a small tilt angle • Decided to build current prototype with flats plates • Would still like to pursue accordion W plates with THP C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

5. New EMCAL Prototype Assembly 2 x 0.5 mm flat W plates, 1 mm fibers, rear spacer for tapering Plates and fiber layer are glued together under vacuum to form a “sandwich” Fibers are assembled into frames Epoxyis applied to 2 tungsten plates Twelve sandwiches are glued together to form a module Finished W-SciFisandwich Sandwich is cured under weight and vacuum C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

6. Absorber Stack Stack of 7 tower modules (not yet glued) Readout has 7x7 optically separated towers Readout end of module is potted with white reflecting epoxy. Other end is covered with 3M ESR reflector X0~7 mm RM ~ 2 cm C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

7. Light Collection Cavities Row of 7 cavities for testing SiPM placement Inside of cavities is coated with white reflector Seven rows of seven cavities are mounted to a frame and readout boards are connected at the back C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

8. Light Collection Efficiency Average efficiency = 4.7% Max/Min ratio = 1.7 S. Stoll C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

9. Light Yield Light output from absorber stack was measured with cosmic rays for one tower module (12 scintillator layers) with directly coupled PMT • Light yield from stack = 600 g/MeV (energy deposited in scintillator) • Sampling fraction of 6.4% •  38,400 g/GeV in calorimeter • Light collection efficiency of 4.7% from cavities  1800 g/GeV • SiPM PDE = 25% •  450 p.e./GeV •  ~ 5% contribution to energy • resolution from photon statistics Light Yield = 600 g/MeV S. Stoll C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

10. LED Calibration System 1:8 split 1:7 split SiPM LED Pulser PIN diode for monitoring LED Splitter fixture for testing uniformity and efficiency of 1x7 splitters 1x7 splitter for distribution of calibration light to light collection cells C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

11. Final Assembly Assembly of absorber stack and readout module into rotation stand C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

12. Testing EMCAL Prototype with Cosmic Rays Digitized cosmic ray pulses ~ 30 MeV (w/higher gain preamp) EMCAL prototype being tested with cosmic rays in the Physics High Bay Pulse height distribution C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

13. sPHENIX HCAL Prototype sPHENIX HCAL prototype being assembled in the Physics High Bay Will be tested with EMCAL prototype in beam test at Fermilab C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

14. Fermilab Beam Test sPHENIX HCAL sPHENIX EMCAL • Test of combined EMCAL and HCAL prototypes at Fermilab in Feb 2014 • (sPHENIX 2/5-2/25, STAR 2/26-3/18) C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

15. Future R&D Plans • Test 7x7 prototype in test beam at Fermilab(electrons up to ~ 8 GeV) • Test 7x7 prototype in test beam at SLAC to obtain better measurement of energy resolution(electrons up to ~ 15 GeV) • Continue development of thin W plates with THP • Produce larger plates (~ 1 m) and determine achievable tolerances • Determine if it is possible/cost effective to produce tapered plates • Determine if it is possible/cost effective to produce accordion shaped plates • Build large scale (~ 1m long) prototype module • Develop technique for assembly aimed at industrialized process • Test new SiPMs from Hamamatsu • Continue development of readout system and electronics C.Woody, EIC Detector R&D Committee Meeting, 1/13/14

16. Budget for Future R&D Plans We are not requesting Year 3 funding at this time but we will request/need additional funding in May/June C.Woody, EIC Detector R&D Committee Meeting, 1/13/14