# Presentation: 076272

## Intensity Measurements through the Stacking Cycle

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

## 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

## 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

## One Pass Measurements During Stacking

**One Pass Measurements During Stacking**

- Solid – Existing
- Dashed – Future
- Dotted – Not Stack

- DtoA Transfer

## SEM Intensity measurement from area of fit

- Dependent upon being able to subtract noise
- Wires intercept beam and cause beam blow-up

- 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.

## 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

## 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.

## 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

## DRF1 bunching pbars prior to the end 

- DRF1 bunching pbars prior to the end
- of the stacking cycle in the Debunchers

- P2 curve design ; time is with respect to $80

## 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 D:TBT ($83)

- Injection of secondaries and debunching

- Bunch and Debunch beam for intensity sampling

- Not the same P2 curve as previous slide

- Blow-up time scale and pull trace of “flat-top” signal and process height for ACNET variable

- In the future, SA and scope setup will be replaced by Ashmanskas board

## Simple comparison of  Intensities

- TOR109 (10^12 protons)

- BPM Intensity (arb)

- IC728
- (10^8 secondaries)

## Histogramming of Intensities

**Histogramming of Intensities**

- ~3% Width

## 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

## Recent Changes to FFT  

- 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

## 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

## 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.

## 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