Status Report on MCP PET Simulation PET detector

Status Report on MCP PET Simulation PET detector design using MCP+ Transmission line board. MCP, Transmission shows fast time responses. Possible candidate for TOP-PET photo detector and readout. Develop Geant 4 Simulation for LSO. Using Geant 4 output, simulate MCP+Trans Board electrical pulse output. 1

2. Simulation Setup Module: LSO, MCP, Photocathode 50 x 29 mm 3 LSO : 12 x 12 pixlelated Xtal, ( 4 x 4 x 25 mm 3 for each) Space between Xtal : 0. 25 mm MCP+Photocathode : 12 x 12 anodes 5. 0 cm distance between two modules. Two 511 ke. V gamma generated at the center with 180 angle. Head to the center of one Xtal( 2. 125, 0) 2

Single electron response • Pulse shape: Gaussian shape with asymmetric width 1 sigma ~300 ps(left), 400 ps(right) ~500 ps rise and falling time • Single electron gain : Assuming 10 e 6. ~70% FWHM. From real measurement(J. F) • TTS : ~100 ps sigma ns Pulse shape for single electron 3

3. Results Readout Schemes 1) Individual anode readout( 12 x 2(up, down)) 2) Transmission line board( 12 x 2 x 2) ( not shown here) 4

# of optical photon at photocatode Total # of photon detected at a photocathode. After Q. E applied. ~770 entries around peak( ~77% efficiency for single module) 5

Signals at 3 x 3 anodes (applied single electron response) ad s aa ns Assign single electron response to each electrons. 6

Rising part (~to 10 ns, m. V) dfd

Energy Readout 12 x 12 anodes separately. (Divide photocathode into 12 x 12. ) Energy sum of 3 x 3 anodes w. r. t maximum signal anode. E resolution: ~11% FWHM 8

Coincidence Timing Maxium signal anodes. Leading edge method. Threshold : 20 m. V ~380 ps FWHM ns 9

Plans Develop Gean 4 simulation for MCP PET. V 0 version is working Readout with Transmission line board. Improve timing. Response at various points. Scintillator with shorter decay time constant. (e. g, La. Br) 10