HEP Tel Aviv University Lumical R&D progress report Ronen Ingbir ECFA - Durham2004 Lumical - A Future Linear Collider detector

ΔE~0.31√E RL Cracow Strip design Lumical - A Future Linear Collider detector

Pad design 0.34 cm Tungsten 0.31 cm Silicon Cell Size 1.3cm*2cm> 1.3cm*6cm< ~1 Radiation length ~1 Radius Moliere HEP Tel Aviv University 15 cylinders * 24 sectors * 30 rings = cells R L 8 cm 28 cm 6.10 m Lumical - A Future Linear Collider detector

HEP Tel Aviv University Reconstruction Algorithm Events Num. We explored two reconstruction algorithms: The log. weight fun. was designed to reduce steps in a granulated detector : 1. Selection of significant cells. 2. Log. smoothing. Log. weight. E weight. Lumical - A Future Linear Collider detector

HEP Tel Aviv University Logarithmic Constant Constant value After selecting: We explored a more systematic approach. The first step is finding the best constant to use under two criteria: 1. Best resolution. 2. Minimum bias. 400 GeV Lumical - A Future Linear Collider detector

HEP Tel Aviv University Energy dependent constant The goal is to find a global weight function. Is the the log. weight constant really a constant ? Constant value Lumical - A Future Linear Collider detector

HEP Tel Aviv University Shower reconstruction Num. of Cells Num. of Sectors Num. of Cylinders Energy portion (%) En>90% What happens when we select the best log. weight constant ? Shower size Log. Weight selection Most of the information is in the selected cells. Lumical - A Future Linear Collider detector

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Magnetic field

HEP Tel Aviv University Background studies BHWIDE + CIRCE Lumical - A Future Linear Collider detector

HEP Tel Aviv University 33 mrad Geometric acceptance Energy Resolution Out In Eout-Ein Eout+Ein P= 3 cylinders 2 cylinders 1 cylinders Lumical - A Future Linear Collider detector

HEP Tel Aviv University Left-Right balance R L Simulation distribution Distribution after acceptance and energy balance event selection Right side detector signal Left side detector signal Right signal - Left signal Lumical - A Future Linear Collider detector

HEP Tel Aviv University Energy resolution Ntuple No cuts With cuts Pure electrons 31 % 29%29% Bhabha 42 % 24 % Bhabha + Beamstrahlung 45 % 24 % Bhabha + Beamstrahlung + Beam spread (0.05%) 46 % 25 % Bhabha + Beamstrahlung + Beam spread (0.5%) 49 % 29 % Lumical - A Future Linear Collider detector

HEP Tel Aviv University Angular resolution Lumical - A Future Linear Collider detector

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector ‘Pure’ electrons simulation Bhabha+Beam+BS(5e-4) Bias study Future linear collider precision goal:

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Real life algorithm Working with both sides of the detector and looking at the difference between the reconstructed properties: (In real life we don’t have generated properties)

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector 0.34 cm Tungsten 0.31 cm Silicon 0.55 cm Tungsten 0.1 cm Silicon Dense design

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector 30 radiation length detector 47 radiation length detector Z (cm) Detector Signal 0.8cm 1.1cm Moliere radius & Radiation length

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Energy Resolution Events New geometric acceptance

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Optimization

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Margins in between cells Energy resolutionPolar resolution

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Our basic detector is designed with 30 rings * 24 sectors * 15 cylinders = 10,800 channels Do we use these channels in the most effective way ? Maximum peak shower design 30 rings 15 cylinders 20 cylinders 10 cylinders 24 sectors * 15 rings * (10 cylinders + 20 cylinders) = 10,800 channels 4 rings15 rings11 rings 10 cylinders

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector Maximum peak shower design Basic Design Angular resolution improvement without changing the number of channels Other properties remain the same Constant value Polar reconstruction 0.11e-3 rad 0.13e-3 rad

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector ‘Real physics’ MC + digitization + elec. noise + New max peak design + Margins Final optimization Pure electron MC Detector properties Events selection ‘Real physics’ MC Bhabha + Beamstrahlung + Beamspread R&D status & future steps High statistics MC for required precision

HEP Tel Aviv UniversityLumical - A Future Linear Collider detector THE END