E Kistenev e RHIC kickoff 040909 Hybrid Stri

E. Kistenev, e. RHIC kick-off, 04/09/09 Hybrid (Stri. Pad) silicon sensors for e. RHIC W-Si EM calorimeters Calorimetrized yoke Muon tracker-identifier solenoid Em-calorimeter Tracking volume 9/19/2021 R ~ 60 cm Air-core toroid 1

FOCal 2009 Segment - 0 Segment - 1 Segment - 2 4 mm W plates, ~21 X 0; 21 layer of ~500 m Si pads 15 x 15 mm 2 8 layers of ~300 m 0. 5 mm wide Si strips (4 X + 4 Y) 62 x 62 mm 2 photon 9/19/2021 2

Multiple scattering in W and shower size W both cleans and regenerate background e’s which propagate freely in the large readout gaps; Early in the shower hit counts in strips is only vaguely correlated with shower energy; At a shower max showers are long merged Y-view W-plates pads Strips(X+Y) Calorimeter separates showers down to ~3 mm distance but efficiency is limited by shower expansion inside “empty” gaps. 9/19/2021 3

LDRD Subject: Hybrid (Stri. Pads) sensors with singleor double-sided readout: (1) single sided with dual readout - high resistivity (> 10 k-cm) n-type Si wafers, with 600 µm thickness. The detector will be made in p+/n/n+ configuration with the segmented side being the p+. Design: Physics+Instrumentation Implementation: Instrumentation Testing: Physics+Instrumentation (2) double sided 9/19/2021 4

Summary & proposal New kind of silicon sensors which would allow to avoid shower spreading inside g-p 0 separator and significantly improve calorimeter resolving power is proposed; Two options (pixilated single sided and double sided) will be prototyped using BNL Instrumentation facilities and studied by PHENIX group; 9/19/2021 5

Detector concept Calorimetrized yoke Muon tracker-identifier solenoid Em-calorimeter Tracking volume R ~ 60 cm n n n Air-core toroid Silicon vertex tracker for jet flavor identification. Bonus: low momentum charged n Fullparticle Si tracking; identification by d. E/dx. n PId due d. E/dx in silicon, shower shape in calorimeters tracking. Nonprojective tracking electromagnetic calorimetry inside magnet. Detailed calorimeters E/p matching To. Flepton (10 ps!!); shower shape measurements toand insure identification in the low p. T domain. Driver for detector size. To. Ftowards upfront; n Muon identification is prioritized high p. T; Solenoidal inside of thin return yoke n Spacemagnet along the beam line calorimetrized ~5 m, central detector yoke(leakage diametertagger) complemented ~2. 5 m. by air-core toroid close to beam pipe forward; 9/19/2021 6