# Presentation: 014187

## BIG/Tune/Scraper

**Peter Cameron**

**March 26-27, 2003**

**BNL SNS Status/Handoff Meeting**

## Outline

- Summary and Conclusions
- March 2003 FDR, ASAC and DOE Review updates
- Status by system
- Budget
- Schedule
- Summary and Conclusions

##  Summary and Conclusions

- Guidance from all sources (DAC, DOE, ASAC, ORNL,...) has been to prioritize, reduce scope as needed to support critical systems
- This guidance has been followed in practice
- Vacuum hardware is on schedule
- DAQ is on hold
- This guidance has not yet been reflected in the budget
- We have presented here a reduced budget and schedule that
- Retains almost all of the original functionality (BTF), and adds some new (scraper)
- Makes ~$200K available for higher priority diagnostics

##  Review updates

- March 2003 FDR
- no comments beyond ‘prioritize’!
- ASAC March 03
- Include resonant quadrupole pickup
- DOE May 03
- Reduced set of Diagnostics for initial commissioning
- End Game plan - funding for BIG pulser and incoherent tune kicker amplifiers moved to FY05 (or beyond?)
- DOE November 03
- Focus on BLM, BCM, BPM, VFM (no mention of wires)
**Writing is on the wall for these systems - cut frills, maximize effectiveness with available resources**

## Beam-in-Gap

-  Status - full speed ahead on vacuum hardware, pulser and DAQ on hold
-  Kicker module
-  went to the shops in October
-  design modification to reduce number of flanges and feedthus - continuous 4.5m stripline
-  first article custom EIA HV feedthru is in testing
-  Not a requirement for CD-4
-  Pulser is problematic - tough engineering problem
-  Alternative approach available for measurement (but not cleaning)
-  mistime extraction kicker (as done at PSR), look at beam on scraper

## Coherent Tune

-  Status - shared hardware with BIG (full speed ahead on vacuum hardware, pulser and DAQ on hold)
-  Alternatives
-  measure tune of injected 400MHz bunches with Ring BPMs - in the baseline
-  Provide a less expensive pulser, sufficient for tune (previous recommendation of DAC)
-  single kick from 3KV Belke switches would deliver ~ 1cm oscillation
-  these switches are standard fare at RHIC - Artus
-  estimate ~$30K for switches and control
-  no polarity reversal/collision avoidance
-  advocated by ORNL Diagnostics - Mike Plum’s presentation

## Incoherent Tune

-  Status
-  full speed ahead on vacuum hardware (dipole and quadrupole pickups and kickers, and damper kickers), motion control, and resonant networks for dipole and quadrupole pickups
-  kicker amplifiers and DAQ on hold
-  Alternatives
-  tune of injected 400MHz bunch - problematic, but in baseline
-  give up BTF, just look at spectra from pickups
-  sensitive resonant pickups have proven extremely valuable in other machines
-  gated acquisition with averaging
-  Look at spectra with DSAs (already purchased)
-  flexibility of DSAs is useful in early system development
-  this was evolution of systems at RHIC
-  BTF in machine studies mode can be accomplished with DSAs

## Tune Pickups

- dipole

- quadrupole

## Scrapers

-  full speed ahead on vacuum hardware and motion control
-  job was in the shops in October, pulled back to extend motion range and add feedthrus for emission current
-  two options for DAQ
-  first choice is emission current - by ORNL, more of what is already provided for HEBT scrapers (more BW needed for gap measurement?)
-  fallback is photomultipliers/gated MCPs
-  PMT adequate for halo
-  gated device needed for gap measurements

## Budget

- Reduced Incoherent tune
- Labor (hdware assy, res networks, motion ,...)  ~$25K
- Materials (resonant networks, motion control,...)  ~$25K
- Reduced BIG/Coherent tune/Scrapers
- Labor (hdware assy, pulsers, motion, DAQ...)  ~$40K
- Materials (pulsers, motion control, DAQ...)  ~$40K
- This frees up ~$200K, provides all Diagnostic capability except BTF (gap cleaning is not a Diagnostic)

##  Schedule

- All Vacuum hardware (including scrapers) complete by July 04
- Motion control interleaved with Dave Gassner’s many other responsibilities, to be accomplished in FY05
- Belke pulser and control to be delivered in FY05
- LabVIEW software to control DSAs - FY05
- Scraper DAQ to be accomplished at ORNL convenience

##  Summary and Conclusions

- Guidance from all sources (DAC, DOE, ASAC, ORNL,...) has been to prioritize, reduce scope as needed to support critical systems
- This guidance has been followed in practice
- Vacuum hardware is on schedule
- DAQ is on hold
- This guidance has not yet been reflected in the budget
- We have presented here a reduced budget and schedule that
- Retains almost all of the original functionality (BTF), and adds some new (scraper)
- Makes ~$200K available for higher priority diagnostics