Intensity Measurements through the Stacking Cycle

1
Intensity Measurements through the Stacking Cycle

• Recycler/Pbar Beam Physics Meeting
• Keith Gollwitzer
• January 14, 2005

2
What Intensities?

• Currently 5x1012 protons on target.
• Secondaries in AP2 and early in the Debuncher
  109 particles
• Circulating in Debuncher and transferred to
  Accumulator is 7.5x107 pbars
• Accumulator core increases up to 1.5x1012 pbars

3
Different Measurements

• One pass
• Toroids (Dave P.)
• SEMs? relative measurements blows up beam
• Ion Chamber? small blow up of beam
• Gap Monitor? INJFLX first pass in Debuncher
• Circulating in Debuncher
• BPM Intensity? require bunch/debunch during
  stacking cycle
• DCCT (Dave P.)
• FFT prior to extraction? Longitudinal coherence
• Circulating in Accumulator
• FFT on injection orbit? Longitudinal coherence
• BPM Intensity? for free during ARF1 ramp
• Deposition orbit? new stacktail monitor

4
One Pass Measurements During Stacking
Solid Existing Dashed Future Dotted Not
Stack
DtoA Transfer
5
SEM Intensity measurement from area of fit
Shown here is special Debuncher SEM403. Two
vertical peaks are the injection pass and closed
orbit. Beam is completely killed by multiple
closed orbit passes.
Dependent upon being able to subtract noise Wires
intercept beam and cause beam blow-up
6
Different Measurements

• One pass
• Toroids (Dave P.)
• SEMs? relative measurements blows up beam
• Ion Chamber? small blow up of beam
• Gap Monitor? INJFLX first pass in Debuncher
• Circulating in Debuncher
• BPM Intensity? require bunch/debunch during
  stacking cycle
• DCCT (Dave P.)
• FFT prior to extraction? Longitudinal coherence
• Circulating in Accumulator
• FFT on injection orbit? Longitudinal coherence
• BPM Intensity? for free during ARF1 ramp
• Deposition orbit? new stacktail monitor

7
Flux capacitor (INJFLX) from mixing the gap
monitor with the RF signal
Being updated to be a java OAC. Overhead
seems to limit to 3-4sec per update being worked
upon.
8
Different Measurements

• One pass
• Toroids (Dave P.)
• SEMs? relative measurements blows up beam
• Ion Chamber? small blow up of beam
• Gap Monitor? INJFLX first pass in Debuncher
• Circulating in Debuncher
• BPM Intensity? require bunch/debunch during
  stacking cycle
• DCCT (Dave P.)
• FFT prior to extraction? Longitudinal coherence
• Circulating in Accumulator
• FFT on injection orbit? Longitudinal coherence
• BPM Intensity? for free during ARF1 ramp
• Deposition orbit? new stacktail monitor

9
DRF1 bunching pbars prior to the end of the
stacking cycle in the Debunchers
P2 curve design time is with respect to 80
10
Switching plate BPM signal sent through a SA at
zero span and small resolution bandwidth
(averaging) and its video output sent to an
oscilloscope input triggered via DTBT (83)
Blow-up time scale and pull trace of flat-top
signal and process height for ACNET variable
Bunch and Debunch beam for intensity sampling
Injection of secondaries and debunching
Not the same P2 curve as previous slide
In the future, SA and scope setup will be
replaced by Ashmanskas board
11
Simple comparison of Intensities
BPM Intensity (arb)
IC728 (108 secondaries)
TOR109 (1012 protons)
12
Histogramming of Intensities
3 Width
13
Different Measurements

• One pass
• Toroids (Dave P.)
• SEMs? relative measurements blows up beam
• Ion Chamber? small blow up of beam
• Gap Monitor? INJFLX first pass in Debuncher
• Circulating in Debuncher
• BPM Intensity? require bunch/debunch during
  stacking cycle
• DCCT (Dave P.)
• FFT prior to extraction? Longitudinal coherence
• Circulating in Accumulator
• FFT on injection orbit? Longitudinal coherence
• BPM Intensity? for free during ARF1 ramp
• Deposition orbit? new stacktail monitor

14
Recent Changes to FFT 1st look at stability
Previous version had averaging and history
involved. Coherence would affect signal for
awhile. Also saw periodic behavior. Now trying
to place in OAC Averaging but no
history. Coherence What to do Paul
Derwent is investigating
Accumulator Debuncher
15
Different Measurements

• One pass
• Toroids (Dave P.)
• SEMs? relative measurements blows up beam
• Ion Chamber? small blow up of beam
• Gap Monitor? INJFLX first pass in Debuncher
• Circulating in Debuncher
• BPM Intensity? require bunch/debunch during
  stacking cycle
• DCCT (Dave P.)
• FFT prior to extraction? Longitudinal coherence
• Circulating in Accumulator
• FFT on injection orbit? Longitudinal coherence
• BPM Intensity? for free during ARF1 ramp
• Deposition orbit? new stacktail monitor

16
New Stacktail Monitor

• Main purpose is to watch deposition area and
  monitor how efficiently the stacktail system
  clears the deposition orbit area (the width of
  ARF1 bucket).
• Essentially measures power prior and after ARF1
  deposits beam.
• Can use as relative measure of beam on deposition
  orbit(?) To be Seen.

17
Comment about Events Timeline

• It has been noticed that the stability of
  intensity signals during stacking is dependent
  upon Event and Timeline
• There can be a yield difference between pure 29
  slip stacking events and 21 mixed mode stacking
  switchyard event up to 10 for IC728/TOR109
• The TLG does not make it easy for consistent 80
  spacing in general stacking cycle time varies.
• One shots and other study cycles