Solenoid

1
Solenoid
target
TPC
DC
2
Conceptual Side View
1.56 m
0.7 m
2 m
RS will not work for PID in our momentum
range. Room for further PID or larger radius TPC
Solenoid (1 Tesla)
Shorten ?
BV (calorimeter)
Solenoid (1 Tesla)
TOF
Barrel Calorimeter
1.6 m
TOF
Forward Calorimeter CsI/PWO
TPC Straw Chambers seems trend, though.
target
Most of tracks go to ?lt90 by simulations
2.8 m
DCs
support coil ?
start counter ? threshold cherenkov ?
Anyway need to simulate B-field for proof.
3
Considerations

• E949 coil is short in length (1.6 m)
• - R0.4 m chambers target in us edge -gt 14
  degree
• - Enough to measure TOF ?
• Large aperture -gt enough B-field in ds edge ?
• - resolution may be worse near 14 degree
• Dipole for forward spectrometer ?
• - Geom. acc. hole for the length of magnet (if
  aperture is not very large)
• - TOF/Calorimeters in ds wall will be very
  large.
• Solenoid option
• - R0.4 m chambers for 4.3 m -gt 5 degree
• - Forward DCs better momentum res. because of
  fixed z (GlueX sim.)
• - better connection of B-field ? (support coil
  ?) -gt Need simulation
• Do not need E949 coil ?
• - No. There are advantages because of large
  aperture.
• (TOF, calorimeter, additional PID)

4
Resolution ?P/P (K-)
From Tsunemis slide
20
20
20
6 GeV
2 GeV
4GeV
resolution ()
resolution ()
resolution ()
10
10
10
0
0
0
0
0
0
180
180
180
Polar angle CM (degree)
Polar angle CM (degree)
Polar angle CM (degree)
20
20
20
2 GeV
4 GeV
6GeV
resolution ()
resolution ()
resolution ()
10
10
10
0
0
0
0
0
0
180
180
180
20?
20?
20?
Polar angle lab. (degree)
Polar angle lab. (degree)
Polar angle lab. (degree)
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plots provided by sawada-san