Roger Rusack – The University of Minnesota. What Forward Detector?. Outline. Physics Motivation: Review the physics that drives the design of the forward region. What do we know and what do we not know. Radiation environment:
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To study this process we need the forward region.
If we are to use particle flow to measure the jet energy, we need good tracking, highly segmented calorimetry and muons momentum for η ≤ 3.0 (at least).
All this means that the forward region will play a central role in the Physics of the HL-LHC.
The question now is how to design the best detector for this region at a price that we can afford in time for installation in 2022.
Mike Lamont May 2012.
M. Huhtinen: Neutron flux for 2,500 fb-1
SLHC Workshop 2004.
> 105 Gy
> 3.105 Gy
> 1015 neutrons/cm2
The neutron flux at 2,500 fb-1.
Current data indicates there will be light losses
Radiation Levels at contact after one month after the start of LS3
So any work on the existing detector will need to be done with shielding of the personnel.
Shashlik design with LYSO
Main idea is that the
WLS acts a light source,but does not
transport the light to the photosensor
The quartz performs that function
Idea proposed by Randy Ruchti (Notre Dame)
Lightspin & UVA
First results from a GaAsSiPM photodetector
Joe Campbell – Electrical Engineering – University of Virginia
Thickness of p+ : ~ 35 nm
AR Coating (2300 Å)
PECVD + Thermal
p: 200 nm, 2x10
p : 480 nm,
n: 2000 nm, 4.5x10
Study spatial extent of the showers by defining square annuli and adding up the ionization and Čerenkov light inside the annuli.
Study resolution we get using energy from tiles where there is Čerenkov light.
50 mm absorber plates.