Transcript E-flow Test Beam Requirements

LC Calorimeter Testbeam Requirements
S. Magill, A. Turcot, J. Yu
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
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- -> ZZ @ 500 GeV
Energy (GeV)
Energy (GeV)
Energy (GeV)
Shower Radius (black) Ampl. Fraction (red)
3 GeV e- in SD Cal
From N. Graf’s 2D gaussian fit
70% of e- energy in layers 3-9
13,15.5
ECAL/HCAL Boundary
5.2,6.2
2.6,3.1
Layer
cm
(front,back)
ECAL
Shower Radius (red) Ampl. Fraction (blue)
10 GeV - in SD Cal
80 cm X 80 cm (min.)
X 34 layer HCAL
15.5,26
7.8,12.6
20 cm X 20 cm
X 30 layer ECAL
Need all 34 layers
Layer
3.1,5.2
cm
(front,back)
HCAL
Summary of E-Flow TB requirements
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 220000!!!
2
X2
54000
3
X3
25000 similar to NIU
4
X4
14000
Total number of channels – 75K -> 250K!
Requirements for TB Facility :
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: 5 - 150 ~ 250 GeV (If possible
as low energies as possible, down to1~2GeV)
d. Muon beam at energies 1-100 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.
Detector Requirements :
• 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
Software Needs :
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?
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, 2003.
It will include an evaluation of the Test Beam prospects
at Fermilab, SLAC, Jefferson Lab, Brookhaven and
others.