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AP2 & Debuncher Acceptance

This document discusses the acceptance criteria, measurements, and mitigations for the AP2 and Debuncher systems. It also covers the existing instrumentation and proposed upgrades for both systems. Orbit control strategies are also addressed.

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AP2 & Debuncher Acceptance

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  1. AP2 & Debuncher Acceptance Keith Gollwitzer DOE Review July 22, 2003

  2. 10 0 Angle (mrad) -10 -10 0 10 Position (mm) Goal: Lots of Pbars into Debuncher < 20 mm-mrad 20-40 mm-mrad > 40 mm-mrad Simulation of pbar transverse phase space (both planes) out of a 750 T/m lens. {2 entries for each pbar that only traverses Lithium part of lens} Collect as much as possible for Debuncher cooling systems AP2 & Debuncher Acceptance – Keith Gollwitzer

  3. Shottkey power (linear scale) Shottkey power (log scale) Lossmonitors Beam Edge Extinction Beam Edge Extinction Admittance Measurements Debuncher horizontal scraper position (mm) Circulating Admittance done by scraping heated reverse proton beam: Ax = 25 mm-mrad (p/p ~ 0) Operational Admittance done by scraping while stacking: Ax = 20 mm-mrad (p/p is full mom. spread) AP2 & Debuncher Acceptance – Keith Gollwitzer

  4. Momentum Acceptance Longitudinal Schottky profile of `p’s filling the momentum aperture of the Debuncher. Bunch rotation and stochastic cooling are off. AP2 & Debuncher Acceptance – Keith Gollwitzer

  5. Acceptance †There are several locations where the physical aperture is known to be less than the admittance indicated in this table (e.g. Band 4 cooling pickups and kickers, Debuncher quadrupole D4Q4, DRF2 and DRF3 cavities). AP2 & Debuncher Acceptance – Keith Gollwitzer

  6. Goal: Realization of 35 mm-mrad Plan: Identify & Understand Restrictions Documentation Research Optical Survey Lattice Modeling Instrumentation Beam Studies Mitigate Redesign/modify/rebuild specific elements Align/relocate specific elements Beam Based Alignment Lattice Model Instrumentation Orbit control Beam Studies AP2 & Debuncher Acceptance – Keith Gollwitzer

  7. Identify Restrictions Building detailed lattice models Tech Div is performing documentation research Verifying drawings with components Producing a table of all apertures Optical Survey Determine alignment of AP2 & Debuncher components Determine alignment of AP1, target hall & AP2 Verify lattice parameters Beam studies using upgraded instrumentation Models (OptiM & MAD) Local & LBNL investigations Identify restrictions and orbit control tolerances Propose resolutions AP2 & Debuncher Acceptance – Keith Gollwitzer

  8. 25 p mm-mrad Acceptance V. Lebedev November 2001 40 p mm-mrad Acceptance Modeling of AP2 Acceptance AP2 & Debuncher Acceptance – Keith Gollwitzer

  9. V. Lebedev November 2001 AP2 Beam Size & Apertures Horizontal&VerticalBeta Function contribution Horizontal & VerticalDispersion contribution Beam envelopes in AP2 line for an admittance of 40 mm-mrad. Aperture limitations are shown by the lines extending from the top of the plot(horizontal&vertical). Synchrotron size is shown for an energy spread of 2.5%. AP2 & Debuncher Acceptance – Keith Gollwitzer

  10. Mitigation of Restrictions Known/Suspect AP2 momentum collimator Either scraper is moved: decrease of acceptance D4Q4 replacement/BPM removal or relocate ~No vertical tolerance for injected beam Motorize stands for septum & kickers Tolerances are small; desire to center devices Injection septum (common vacuum chamber) Desire injected beam to be close to closed orbit Band 4 cooling tanks arrays Array separations were designed for ~32 mm-mrad Move DRF2 & DRF3 to low dispersion region Radiation surveys show activation Other mitigations Identification and solutions may have to wait for modeling, beam studies and/or implementation of above. AP2 & Debuncher Acceptance – Keith Gollwitzer

  11. Beam direction D4Q4 Aperture No tolerance for injected beam. Replace with large quad; increase vacuum chamber by 20%. Remove BPM from upstream area. AP2 & Debuncher Acceptance – Keith Gollwitzer

  12. Beam Size (mm) Band 2 Band 1 Band 4 Band 3 HorzVert Physical Apertures Debuncher Arrays Aperture Beam sizes calculated for 40 mm-mrad Arrays are motorized to be centered about beam AP2 & Debuncher Acceptance – Keith Gollwitzer

  13. Existing AP2 Instrumentation AP2 & Debuncher Acceptance – Keith Gollwitzer

  14. Existing Debuncher Instrumentation AP2 & Debuncher Acceptance – Keith Gollwitzer

  15. Instrumentation Upgrades BPM systems Old original electronics and DAQ. Reliability, maintenance and ease of use are issues Debuncher (~50m resolution) 2.5MHzClosed Orbit system (elec., DAQ & software) AP2 (desire <100m resolution) 53MHz Minimum is DAQ and software replacement Need to see if electronics are sufficient Other Re-install AP2 709 horizontal collimator AP2 large aperture Toroid(s) Beam intensity measurement along beam line New Move SEMs for optimal phase advance(?) Other instrumentation as needed AP2 & Debuncher Acceptance – Keith Gollwitzer

  16. Orbit Control AP2 Started with 4H+4V trims Have added 1H+3V trims Installed shunts on all dipoles of left bend Can add more trims as needed Debuncher Started with 13H+7V trims Started with 2 vert. plane motorized quads Have added 5 two plane motorized quads Adding 10 two plane motorized quads (03) Adding 20 two plane motorized quads (04) No available space for trims; the ring is packed AP2 & Debuncher Acceptance – Keith Gollwitzer

  17. Beam Based Alignment & More Basic BBA Procedure Excite a quad Most quads have shunts Measure response BPM systems for proton studies A Debuncher pickup for AP2 during stacking Correct Orbit Trims, shunts, motorized quad stands Other Study Programs Heat protons in Deb and watch BLMs Paint the Debuncher aperture Prepare known emittance/momentum reverse proton beam & kick beam up AP2. AP2 & Debuncher Acceptance – Keith Gollwitzer

  18. Debuncher TBT Instrumentation Used for closure QS730 changed by 16Amps With quad shunts, orbit through the quad centers can be determine during stacking AP2 & Debuncher Acceptance – Keith Gollwitzer

  19. Paint the aperture mm Not Fully debugged- commissioned in 1999-2000. For each corrector, kick until beam loss: then have “painted” the aperture mm AP2 & Debuncher Acceptance – Keith Gollwitzer

  20. Summary Beam Based Alignment will be more useful: Upgrade instrumentation Better orbit control AP2 beam line Had 13 knobs, have added 10, can add a few more Debuncher ring Had 22 knobs, have added 10, will add 60 more Will have better understanding of lattices and the physical apertures & tolerances Upgrade/new software applications Will have to mitigate limiting apertures Redesign/modify/rebuild/relocate AP2 & Debuncher Acceptance – Keith Gollwitzer

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