Possible Siting of MANX in KTeV Hall

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Possible Siting of MANX in KTeV Hall

• Bob Abrams
• 8/30/2007
• Updated for LEMC
• 4/24/2008

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Motivation

• KTeV can handle higher intensities than Meson
  41012 protons/pulse on target
• KTeV hall is spacious and well equipped
• Upstream sections have large diameter, long
  vacuum pipes for pion decay regions
• Several possible locations for target, expt.
• Currently not in use, E906 is only potential user
  (not committed yet)

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KTeV Hall Location
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Option 1 Conceptual View of MANX in KTeV
Hall Shown in E906-Compatible Mode
KTeV Upstream Beam Line
Replace with small beam tube
Pi Decay Region
KTeV Experimental Area
Degrader
HCC
MANX Target
39 m
MANX Bend 3 Downstream Spectrometer
MANX Bend 1
MANX Bend 2 Upstream Spectrometer
10 m
E906 Setup
Location of Virtual detector For G4BL run
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Option 2 MANX in KTeV HallShown in Downstream
Location
KTeV Upstream Beam Line
Beam Dump
Pi Decay Region
KTeV Experimental Area
Degrader
HCC
MANX Bend 1
MANX Target
10 m
MANX Bend 3 Downstream Spectrometer
MANX Bend 2 Upstream Spectrometer
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Option 3 MANX in KTeV HallShown in Downstream
Location Behind Beam Dump
KTeV Upstream Beam Line
KTeV Beam Dump
KTeV Experimental Area
Degrader
HCC
MANX Bend 1
MANX beam dump And target
10 m
MANX Bend 3 Downstream Spectrometer
MANX Bend 2 Upstream Spectrometer
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Layout of Components
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15
m
20
0
10
1
2
3
4
Magnet 1 (1m)3 0.4T w/Degrader 0.2T w/o Degrader
KTeV Vacuum Pipe
Virtual Detector 2 1m radius
Magnet 2 2.5m from beam -0.2T
Degrader (2m)3 Al
HCC
600 MeV/c w/Degrader 300 MeV/c w/o Degreader
300 MeV/c
Virtual Detector 3 3m radius
Virtual Detector 4 3m radius
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Conditions and Results 4 Runs, Detector 4
Muons per 1012 Protons 16106
14106 8106 15106
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(Ptot vs x), x and y within /- 250 mm of Ctr of
Magnet 2 at Detector 4, Ptotlt600 MeV/c
Run 2b
Protons, no Degrader
Muons, no Degrader
Pions, no Degrader
Muons, with Degrader
Pions, with Degrader
Run 2a
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Run2b, Muons, x,y within /- 250mm,P lt 600
MeV/c, after Magnet2 (det4)
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Summary of Results of Runs

• Numbers of muons higher than in Meson. No
  significant difference in muon rates in the two
  locations in KTeV hall
• Running without degrader gives somewhat lower
  pion backgrounds (??). May be due to intrusion
  of degrader into the area near the beam.
• Need to do more G4BL runs, better statistics,
  more configurations, improvements of yield,
  purity.
• Need to look at farther upstream location, which
  uses existing KTeV target installation.

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Other KTeV Factors

• Switchyard modifications needed to deliver 120
  GeV beam, costs
• Other modifications needed for MANX e.g.
  shielding, vacuum system, etc.
• Competition from neutrino experiments for protons

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More Detailed Plots (No Cuts)

• Plots 1 X and Ptot distributions for Mu, Pi, and
  P at Detector 2,upstream of Magnet 1
• Plots 2 X and Ptot vs X for Mu, Pi, and P at
  Detector 4, downstream of Magnet 2, no X or Y
  cuts, no degrader

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Plots 1 Upstream of Magnet1 (Det2)
Ptot of Pi
Ptot of Proton
Ptot of Mu
X of Mu
X of Pi
X of Proton
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Plots 2 Run 2b Det4 Downstream of Magnet2, No
Degrader, Effect of Magnet Aperture
X of Pi
X of Mu
X of Proton
P vs X of Pion
P vs X of Muon
P vs X of Proton
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More Detailed Plots (With Cuts)

• Plots 3 Run 2a, X for Ptot lt 1000 MeV/c and y
  lt 500 mm. Ptot for above cuts plus
  x2500lt700mm.
• Plots 4 Ptot for above x and y cuts, no Ptot
  cut.

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Plots 3 Apply Cut Ptot lt 1000 MeV/c and
abs(y)lt500 Run2a, With Degrader, Downstream of
Magnet2 (Det4)
X of Mu
X of Pi
X of Proton
Apply additional cut abs(x2500)lt700
Ptot of Muon 15 between 300 and 400MeV/c
Ptot of Proton 6 between 300 and 400 MeV/c
Ptot of Pion 8 between 300 and 400 MeV/c
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Plots 4 Remove Ptot Cut and Retain Cuts
abs(y)lt500 and abs(x2500)lt700 Run 2a, With
Degrader, Downstream of Magnet2, Detector 4
Ptot of Muon 235 Events
Ptot of Proton 79 Events
Ptot of Pion 106 events
(8 between 300 and 400 MeV/c)
(6 between 300 and 400 MeV/c)
(15 between 300 and 400MeV/c)
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Backup Slides
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Preliminary G4BL Results (Not Optimized)Mu and
Pi Rates vs Momentum at entrance to HCC (Run 1e,
Presented at AAC))
500,000 protons incident on 1 int length Fe
target 2m Al degrader between M1 and M2 Cuts
X, Y within 0.5m of reference orbit Ptot lt 2000
MeV/c 12 muons and 4 pions between 300 and 500
MeV/c
Muons (72 Events)
Scaled Results per 1.0e12 protons Muons
3e7 Pions 8e6 Additional cuts needed to
reduce area And momentum range (factor of 10?)
Pions (20 Events)