Synclite status

1
Synclite status

• -or-
• Hey, where did all the light go?

2
Instrumentation related artifacts

• All done without filters
• of camera frames
• MCP voltage vs. Duty cycle
• Attenuator
• Pulser voltage
• 2-D scan of intensifier/camera (check intensity
  and sigma)
• Few percent variation

3
Gain vs. MCP voltage
Skipped turns 43
4
Sigma vs. number of camera frames
5
Sigma vs. ( skipped turns, a.k.a. inverse duty
cycle, and MCP voltage )
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Sigma vs. ( skipped turns, a.k.a. inverse duty
cycle, and MCP voltage )
MCP Voltage
Skipped Turns (inverse duty cycle)
7
Sigma vs. input light intensity
8
Sigma vs. image intensifier pulsing voltage
9
Gain linearity with photon flux
10
Mirror Moves

• Discovered that the proton mirror had been
  inadvertently moved in by half an inch over the
  shutdown
• Source of the large tails seen earlier
• Moved the proton mirror back out a ways, but not
  quite as far out as it was. Should move it back
  to where it was.
• Moved the pbar mirror in to record images.

11
Before / after mirror move at 440 nm
12
Protons
13
Antiprotons
14
Proton mirror move simulation with varying
optical configurations
15
Antiproton Data
16
Antiproton Simulation
Camera focused 1 meter into body of magnet
17
Beampipe Radius 37 mm Separation 34 mm Light cone
radius 6 mm
Beampipe Radius 50 mm Separation 36 mm Light cone
radius 6 mm
Protons
Beampipe Radius 32 mm Separation 26 mm Light cone
radius 5 mm
Dipole
Mirror
6.1 m
1.15 m
16 - 28 mm
22 - 10 mm
0.25 m
25 mm radius lens occupies some unknown location
in a 3 pipe

• Seems quite possible that we are losing some
  light
• Spot could be anywhere from 10 to 22 mm off
  optic axis of lens

8 mr from vertical
36 mm
18
Antiprotons
Separation is 13 mm Light cone radius 4 mm
Half Dipole
Dipole
Mirror
3 m
1.5 m
0.14 m
8mm

• No danger of hitting beampipe
• Spot is 7 mm off optic axis of lens

4 mr from vertical
25 mm radius lens occupies some unknown location
in a 3 pipe
19
Diffraction

• Measure the width at different wavelengths
• Diffraction ?
• Sigma Sigma(beam) Diffraction
• Sigma sqrt( s² ?² )
• Check that the focal point vs. wavelength makes
  sense

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Plano-convex lens, BK7, (R is radius)
Refractive Index, n
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Body light
Beam
Edge light
Lens
Camera
Notice split in peaks
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Conclusions

• The horse is not dead yet
• Extract diffraction contributions for p and pbar,
  hor. and vert.
• Check pbar shapes (probably end up being better
  behaved than proton)
• Missing light
• Move the proton mirror in finer steps to
  determine horizontal distribution of light
• Move the beam (off helix?)
• Continue with simulation in attempt to understand
  what we see

25
Store 3745
FBI ratio is 10 SL ratio is 0.3 expected SL
ratio (beam splitter, mirror) is 4.5 actual p /
expected p 0.07. Only 7 of light getting
through???
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Distance from cutoff to edge of mirror
Beampipe cutoff
Mirror
Unobstructed intensity