LC Calorimeter Testbeam Requirements Sufficient data for Energy Flow algorithm development Provide data for calorimeter tracking algorithms  Help setting MIP threshold Test feasibility for various detector technologies Aging, responses and resolutions for different technologies/geometries Investigate the effects of incident angles and sampling ratio Construct shower library based on Testbeam showers Investigate magnetic field effect to Energy Flow Algorithm S. Magill, A. Turcot, J. Yu

E-flow Test Beam Requirements Development of HCAL relies on simulation for EFA applications Simulations need to be verified in test beam at shower level Ultimate goal is jet energy/particle mass resolution - not possible in test beam? So, since EFAs require separation/id of photons, charged hadrons, and neutrals - Verify photon shower shape in ECAL prototype (Si/W with fine granularity - 1X1 cm**2 or better – see plot) Verify pion shower probability in ECAL as function of longitudinal layer (see plots) Verify pion shower shapes in ECAL/HCAL prototype (must be able to contain the hadron shower both transverse and longitudinally – see plot) Try to get beams with particle energies as in Z jets from e+e- -> ZZ at 500 GeV ->

e+e- -> 500 GeV Energy (GeV)

3 GeV e- in SD Cal Layer Shower Radius (black) Ampl. Fraction (red) 70% of e- energy in layers 3-9 From N. Graf’s 2D gaussian fit 2.6,3.1 13, ,6.2 cm (front,back) ECAL ECAL/HCAL Boundary

10 GeV  - in SD Cal Need all 34 layers 20 cm X 20 cm X 30 layer ECAL 80 cm X 80 cm (min.) X 34 layer HCAL Shower Radius (red) Ampl. Fraction (blue) Layer 3.1, , ,26 cm (front,back) HCAL

Geometry : Need a test beam geometry and G4 simulation package for JAS?/ROOT? with no field - 20X20 cm**2 ECAL and at least 80X80 cm**2 HCAL Number of Channels : If ECAL segmentation is 5 mm X 5 mm, then number of ECAL channels is 48000! If HCAL segmentation is 1 cm X 1 cm, then number of HCAL channels is !!! 2 X X similar to NIU 4 X Total number of channels – 75K -> 250K! Summary of E-Flow TB requirements

1. An independent hall that can be interlocked for hadron runs. 2. A crane that can handle sufficiently large weights for absorber plate assembly and manipulation of the assembled modules. (20ton?) 3. Beam line with the following conditions: a. Electron and photon beam b. Pion and other hadron beam c. Energies of EM and Hadrons: ~ 250 GeV (If possible as low energies as possible, down to1~2GeV) d. Muon beam at energies GeV or so ==> This is for calorimeter tracking algorithm studies. e. Beam line equipped with rotating dipoles that can let us position beam as we want. Requirements for TB Facility :

Detector needs: Tracking needed? Magnet to mimic central magnetic field Absorber plates that have adjustable gaps and adjustable absorber thickness Interchangeable sensitive gap Ability to change the incident angle Sufficient number of readout channels Studies Needed : 1. Mimicking neutrons with protons 2. Detector sizes 3. Study of LC jet characteristics, such as energy distribution of hadron in the jets, for various CMS energies  Do we need to contain the entire shower energy? 4. Cross check of MC’s to verify the longitudinal energy profile of single particles Detector Requirements :

1. Analysis software capable of dealing with TB geometry 2. Simulation of the TB geometry 3. Online monitoring 4. Slow control monitoring 5. Data and code management Questions : When do we run TB? Late 2005 or early 2006? How long do we run? Where do we run? Software Needs :

Towards a TestBeam Document : Goal is to have a document that addresses many of the issues mentioned here as well as others for discussion/comment at the UTA LC workshop in January, It will include an evaluation of the Test Beam prospects at Fermilab, SLAC, Jefferson Lab, Brookhaven and others.