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Data Collection RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen)

{. With protons. RR pbar Longitudinal Emittance during Beam Stacking and Unstacking and Some Issues Chandra Bhat MI/RR Group February 12, 2003. Data Collection RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen)

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Data Collection RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen)

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  1. { With protons RR pbar Longitudinal Emittance during Beam Stacking and Unstackingand Some IssuesChandra Bhat MI/RR GroupFebruary12, 2003 • Data Collection • RTD720 scope and RR wall current monitor and R86 ( by Ming-Jen) • A TCLK event for multiple triggers in sequence (by Craig McClure and Greg Vogel) • Case Studied • Pbar Stacking • Pbar Un-stacking • De-bunching and Re-bunching in 2.5 MHz rf buckets • Compression and De-compression • Issues

  2. Dedicated Variable Event A new TCLK event E6 is allotted for this purpose for future usage

  3. WCM data of Pbar stacking(AR  MIRR Transfer 2, January 10, 2003)

  4. el =88eVs DE/E=0.13% el =81eVs DE/E=0.23% el =14.5eVs DE/E=0.27% el =64eVs DE/E=0.29% el =78.5eVs el =13eVs el =64eVs DE/E=0.29% el =77eVs Four Different Timing during Stacking

  5. RR WCM data of Pbar Un-stacking(RRMI Transfer 4, January 8, 2003)

  6. el > 13.7eVs el = 29eVs DE/E=0.31% el >42.7eVs (26bkts) (85bkts) el = 15eVs DE/E=0.1% el = 29eVs DE/E=0.31% el = 44eVs (26bkts) (85bkts) el = 46eVs DE/E=0.33% (52bkts) Three Different Timing during Un-stacking

  7. el = 17eVs DE/E=0.30% el >13.7eVs el >30.7eVs el = 11.5eVs DE/E=0.26% el =28.5eVs el = 29eVs DE/E=0.31% Pbar Un-stacking(RRMI Transfer 5, January 8, 2003)

  8. el > 13.6eVs el = 19eVs DE/E=0.13% el = 17eVs DE/E=0.30% Pbar Un-stacking(RRMI Transfer 6, January 8, 2003)

  9. = 85bkts V=2kV De-bunching time = 20 sec Hold off time = 8 sec Re-bunching time = 20 sec = 48bkts Before de-bunching De-bunched After re-bunching De-bunching and Re-bunching in 2.5 MHz rf buckets

  10. = 85bkts V=2kV V=1.4kV De-bunching time = 3 sec Hold off time = 8 sec Re-bunching time = 3 sec = 48bkts Before de-bunching ; el = 4.8eVs De-bunched After re-bunching ; el = 6.2eVs Conclusions : Emittance Growth ~30% De-bunching and Re-bunching in 2.5 MHz rf buckets(continued)

  11. = 85bkts V=2kV V=1.4kV De-bunching time = 20 sec Hold off time = 8 sec Re-bunching time = 20 sec = 48bkts Before de-bunching ; el = 5.5 eVs De-bunched After re-bunching ; el = 8.0 eVs Conclusions : Emittance Growth ~ 45% De-bunching and Re-bunching in 2.5 MHz rf buckets(continued)

  12. At Injection After Re-bunching De-bunching time = 3 sec Hold of time = 2sec Re-bunching time = 3 sec ESME Simulations of De-bunching and Re-bunching in 2.5 MHz rf buckets

  13. Some Issues • The data have been analyzed using a primitive (but accurate) method. We need to automatize this. We need this information on every transfer  This is a lots of work (we are working on it) • By integrating the area and calibrating it with I:RBEAM we can measure beam intensity on each transfer • We see systematic difference in emittance from sequence to sequence during stacking and un-stacking of pbars, which is indicative of emittance dilution. This needs more study. This can be done using protons • At present the stacking and un-stacking sequences are about 100 sec long. This has impact on collider operation. We should revisit them and optimize.

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