FSC status and plans Pavel Semenov IHEP, Protvino 28 Jan 2005 FSC status and plans Pavel Semenov IHEP, Protvino on behalf of the IHEP PANDA group PANDA Collaboration meeting, Turin 15-19 June 2009

Pavel Semenov, PANDA Collaboration meeting, Turin Outline MC simulations: to set detector requirements (Nikolay Minaev) On the way to the full FSC simulation in PandaRoot (Dmitry Morozov) Photodetector selection List of reqs to FE and DAQ Some new preliminary results of prototype 55x55 testbeam 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Fast MC (photons energy distribution) All photons energy (upper curve) over photons at the Shashlyk aperture (color curves) 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Photons in the FSC, 6.27 GeV/c beam 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Charmonium study, 6.27 GeV/c beam Energy of photons from charmonium decays going to FSC is relatively small, registration threshold should be similar to EMC 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin FSC in PandaRoot Implementation of the optical model proved by testbeam measurements is underway FSC geometry in PandaRoot is defined. Forward spectrometer geometry inconsistency found Geo Mapper compatibility problem – in the current version FSC dimensions are hardcoded 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Shashlyk module internal structure 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

FSC geometry and position To check the FSC geometry description the complete forward spectrometer was drawn 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

The last DCH Overlaps with FSC Either position or a size of the DCH is incorrect. Also forward TOF wall is missing 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Photodetector selection The goal was to select and test several PMT’s types (noise, dyn.range, rate effect, signal width, long term stability, dimensions) Now we are in the process of buying samples from Hamamatsu and ElectronTubes (Photonis “temporarily” doesn’t produce PMTs) R1925 looks attractive (like R7899 but more compact, only 43 mm and green enhanced) ETL 9085B – compact, good stability, but expensive 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

FSC list of reqs for FEE and DAQ Signal dynamic range 3 MeV- 15 GeV Noise 1-3 MeV ? (testbeam showed pedestals sigma 5-6 MeV, mainly due to correlated pickup) Hit rate 1 MHz near beam pipe, 300 kHz detector edge (per channel, energy over threshold) Photodetector (PMT) signal (10 ns + 40 ns) goes directly to sampling ADC (180 MHz, 12 bits?) with 3 meter cable Data size ~10 samples per event per channel Overall channels: 1500, typical event size 3-5 photons (~100 amplitudes after feature extraction) Tracking system information can be used to reduce data flow Light injection monitoring system events readout Prototype tested with slow ADC, next testbeam to test shashlyk performance with sampling ADC (Uppsala SADC?) 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Proto64 (55x55 mm2 cell) testbeam results Preliminary results: Energy resolution dependence on electron energy σE /E = 5.6/E  2.4/√E  1.3 [%] σE /E = 3.5/E  2.8/√E  1.3 [%] Big cell prototype 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin Summary MC simulations to set detector requirements show that for charmonium physics FSC should have good performance at relatively low energy (1.5 GeV and lower) FSC implementation in PandaRoot framework is underway Testbeam shows energy resolution for the small cell size similar to the big cell prototype Getting ready to make a photodetecor and type of FEE choice 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin Backup slides 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Shashlyk signal shape (cosmic muons) Rise time ~10 ns, tail ~40 ns 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin Shashyk module sizes 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Shashlyk module tail stucture Two types of possible mounting of the module: 4 tubes or 1 screw 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Overall design of the FS EMC 27x14 modules (4cells each) Frame sides to put FEE crates (~3 meter signal cable from PMT to ADC) Back plate to fix modules in Z direction (modules position from one side and photodetectors from the other side of the plate ) Accelerator pipe hole (2x2 modules) shifted from the center Dedicated rail system for maintenance procedure 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin Detector sizes Active zone 2970x1540 mm2 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Time between energy depositions (one cell) Near pipe Detector vertical edge 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Calorimeter at the maintenance position To provide a possibility of Shashlyk maintenance A dedicated extensible rail system is proposed. Calorimeter can be shifted out to the left or the right side of the Forward Spectrometer. At the working position it fixed by lock pins with high precision 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Pavel Semenov, PANDA Collaboration meeting, Turin Testbeam setup DC1 M14 DC2 DC3 DC4 ECAL Target Beam S3 S2 S1 St SA Spectrometer consisted of 4 drift chamber stations and a magnet to measure beam particle momentum precisely Calorimeter prototype Al target at 1.5m and 3 m before the prototype 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Testbeam results for 1.5 m (more sophisticated analysis) Shower profile fit, Charged hadrons removed (drift chamber), Rough calorimeter calibration π0 1-2 GeV, σm 12.5 MeV Next steps: Precise calibration, All data analysis, Big and small cell performance comparison 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

New prototype parameters 64 cells (16 supermodules) assembled in matrix 380 layers of 0.3-mm lead and 1.5-mm scintillator, total length 680 mm Transverse size 55x55 mm2 Effective Moliere radius: RM=59 mm Effective radiation length: X0=34 mm Total radiation length: 20X0 Light collection: 36 fibers BCF-91A (1.0 mm) 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin

Prototype modules production 14-19 June 2009 Pavel Semenov, PANDA Collaboration meeting, Turin