Purpose Purpose
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27.03.2018
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Purpose Purpose
Angular distribution is isotropic. Backwards proton almost certain to be a spectator.
Time Projection Chamber (TPC)
Uses standard 10cm x 10cm GEMs.
Cosmic tracks easily recognized.
Heavily Ionizing Protons from TUNL’s Tandem
Specialized spectator proton detector developed
Purpose
Purpose
Provide almost-free neutron target to improve our understanding of neutron structure.
Purpose
Purpose
Neutron Structure-function measurements unencumbered by Final-State
Interaction Effects
Measure
slow protons
Measure slow protons
Identify spectator protons to tag e-d events in which the neutron was struck.
Angular distribution is isotropic.
Backwards
proton almost certain to be a spectator.
Angular distribution is isotropic.
Backwards
proton almost certain to be a spectator.
Momentum distribution favors low values.
Tracks are 20x - 50x minimum ionizing.
Time Projection Chamber (TPC)
Time Projection Chamber (TPC)
Just
a box of gas
Readout elements only on the surfaces.
Windows can be made thin.
Uses standard 10cm x 10cm GEMs.
Uses standard 10cm x 10cm GEMs.
Drift region similar to planned final detector.
Uses 3x 3M GEMs to allow tracking cosmics (min-I).
At present, tests are performed using 80/20 Ar/CO2.
Cosmic tracks easily recognized.
Cosmic tracks easily recognized.
Position resolution would be better with charge sharing over ≥3 pads.
Gain ~ 303
Heavily Ionizing Protons from TUNL’s Tandem
Heavily Ionizing Protons from TUNL’s Tandem
Specialized spectator
proton detector developed
Specialized spectator proton detector developed
First
use of GEMs at JLab
First
application of Curved GEMs
Experiment Run
More to come
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481 b.
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