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

2. Progress Since Last Meeting (June 2013) C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 2 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

3. EMCAL Tilted Plate Configuration (Flat plates - No Accordion) C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 3 A.Kiselev 2 mm W + 1 mm fiber1 mm W + 1 mm fiber Energy Resolution vs Tilt Angle Conclusion: 1mm/1mm sampling reduces dependence on tilt angle and improves performance

4. Tilted Plate vs Accordion C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 4 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

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

6. Absorber Stack C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 6 Stack of 7 tower modules (not yet glued) Readout has 7x7 optically separated towers X 0 ~ 7 mm R M ~ 2 cm Readout end of module is potted with white reflecting epoxy. Other end is covered with 3M ESR reflector

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

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

9. 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  /MeV (energy deposited in scintillator) Sampling fraction of 6.4%  38,400  /GeV in calorimeter Light collection efficiency of 4.7% from cavities  1800  /GeV SiPM PDE = 25%  450 p.e./GeV  ~ 5% contribution to energy  resolution from photon statistics Light Yield = 600  /MeV S. Stoll

10. C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 10 LED Calibration System Splitter fixture for testing uniformity and efficiency of 1x7 splitters 1x7 splitter for distribution of calibration light to light collection cells LED Pulser PIN diode for monitoring LED 1:7 split1:8 split SiPM

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

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

13. 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

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

15. Future R&D Plans C.Woody, EIC Detector R&D Committee Meeting, 1/13/14 15  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

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