CesrTA Status Report Mark Palmer for the CesrTA Collaboration March 4, 2009 ESR
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1 CesrTA Status Report Mark Palmer for the CesrTA Collaboration March 4, 2009 ESR
2 Outline Recent Updates January run/february Down Overview Optics & LET xbsm Electron Cloud Studies Tune Data-Simulation Comparisons RFA Data Status and Plans Will cover a few things expect that some topics will be covered in talks from other labs March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 2
3 CesrTA Run & Down Recap Completed experimental run 2/2/2009 Low emittance correction in GeV baseline optics X-ray Beam Size Monitor (xbsm) commissioning EC Measurements RFA & TE wave measurements Dynamics General instrumentation/feedback tests/commissioning 13 visitors LET - J. Jones, A. Wolski xbsm J. Flanagan, H. Sakai EC S. De Santis, R. Holtzapple, K. Shibata, L. Wang Feedback D. Teytelman, M. Tobiyama CLIC H. Schmickler Instrumentation A. DellaPenna, I. Pinayev 2 nd upgrade down is just concluding (first beam in CESR stored early this morning) Installation of PEP-II experimental hardware Installation of photon stop chamber for 5GeV operation of the CesrTA L0 wiggler straight Planned Contingency item: Replacement of SRF cavity that failed during summer 2008 Installation of xbsm beam line front end for electron beam Continue with instrumentation upgrade for 4ns bunch train operation New Contingency item: Repair of 15BW dipole coils (overheating bus-bar connection) March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 3
4 Optics and LET-January Run Low emittance GeV optics loaded and corrected Correction methods tested Beam-based alignment measurements Coupling and dispersion bumps created for tuning Emittance measurements begun Touschek lifetime measurements initially used to characterize beam size xbsm measurements as detector and optics were characterized Ongoing program of magnet alignment to improve emittance Alignment work continued throughout the run 2 anomalous locations in the ring have been identified which are being scrutinized. March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 4
5 First Detailed Optics Correction Touschek Study xbsm Measurement (Preliminary) A. Wolski 1 1 ibunch τ = d + b Touschek Parameter Measured energy acceptance ~ 0.7% ε v ~ 32pm From xbsm σ v ~ 15±5 µm ε v ~ 38pm Appear to be within a factor of ~2 of the 20pm target March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 5
6 xbsm Snapshots (Preliminary) Scan of coupling knob Coded aperture measurements Smallest recorded size: ~15 µm (but further calibration work needed) Simulations Fresnel Zone Plate Coded Aperture Measurement <20µm beam size March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 6
7 EC Data-Simulation Updates Simulations of tune shifts in POSINST at Cornell and LBNL, using a new option in POSINST for offseting the bunches, have shown that the tune shifts of a single bunch are different if the whole train is oscillating coherently, than if just the single bunch is oscillating. Horizontal tune shifts in a dipole are much smaller when the whole train is oscillating coherently. This is particularly relevant for the tune shift measurements at CesrTA, since we kick the whole train coherently to do the measurement. Tune shifts calculated for a coherently oscillating beam give better agreement with measurements: see following three slides. January run Studies of systematic effects in the tune shift measurements were carried out. Measurements of tune shift vs. current for long trains (10, 20, 45 and 116 and 145 bunches) were carried out (evidence of instability developing at the end of the 116 and 145 bunch trains) RFA and TE wave measurements to characterize EC density in drifts, dipoles and wigglers Work on comparisons between RFA and TE wave measurements as well as systematics checks for both March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 7
8 10 Bunch Train with Trailing Witness Bunch(es) Data-POSINST Comparison (Preliminary) Experimental Procedure: 10 bunch leading train which generates the cloud Witness bunches placed at various delays behind the initial train Measure tunes of all bunches simultaneously Positron Beam Blue Vertical Q Red Horizontal Q Squares Simulation Circles Data March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 8
9 10 Bunch Train with Trailing Witness Bunch(es) Data-POSINST Comparison (Preliminary) Electron Beam Blue Vertical Q Red Horizontal Q Squares Simulation Circles Data March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 9
10 45 Bunch Train: Data-POSINST Comparison (Preliminary) Positron Beam Blue Vertical Q Red Horizontal Q Squares Simulation Circles Data March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 10
11 Drift vs Dipole Contributions Comparison of drift (red) and dipole (blue) contributions to tune shifts in each dimension Horizontal Positrons Vertical March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 11
12 L0 RFA Data 2E Segmented RFA Wiggler with RFAs and TiN-coated VC e+ e- Wiggler with RFAs and uncoated Cu VC 2/3/08 2W Segmented RFA March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 12
13 Cu wiggler (pole center) Electron-Positron Comparisons (1x45 Current Scans) 2W detector downstream of wigglers for e+ beam Segmented drift Positrons Cu wiggler (pole center) Electrons 2E detector downstream of wigglers for e- beam Segmented drift March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 13
14 Long Train Data 1x145 e+ 14 ns spacing 79% of ring filled Multipacting stripe Strongly visible in dipole Weaker in L0 wiggler and drift regions Dipole (Al VC) Cu wiggler, pole center Drift (Cu VC) March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 14
15 Machine Status and Plans All major CESR layout modifications are now complete! 4 Experimental areas for EC build-up and mitigation studies L0 wiggler straight Configured for RFA and TE Wave measurements of EC build-up 4 wiggler comparisons planned (CU-KEK-LBNL-SLAC collab.)» Cu vacuum chamber (installed)» TiN coated vacuum chamber (installed)» Grooved vacuum chamber ( summer 09 installation)» Clearing electrode vacuum chamber ( fall 09 installation) L3 straight w/pep-ii chicane and SEY sample station Sample station tests (CU-FNAL-SLAC collab.) Grooved chamber tests (CU-SLAC collab.) 15E/W Flexible location for testing chambers with dipole synchrotron radiation Presently planned comparisons (summer/fall 09)» Al vacuum chamber Segmented RFA» α carbon coated VC (CERN-CU collab.)» Enamel chamber with electrode (Project X collab.)» TiN-coated Al vacuum chamber Detailed beam dynamics studies at ultra low emittance Mid-2009 end of program Characterize instability thresholds High resolution bunch-by-bunch beam size measurements to characterize incoherent emittance growth Witness bunch studies for flexible control of EC interaction with beam Shielded Pickups 15E/W test chamber design for coating tests March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 15
16 L3 Experimental Region e+ Ion Detector (ERL) SEY Station e- PEPII Chicane EC VC West East Configured for In Situ SEY Measurements Sample 1: Radial outside Sample 2: 45 from radial outside Sample March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 16
17 CesrTA Information Next WebEx Meeting: Tuesday, March 10, 9am US EDT - details at: Schedule Details at: Startup period until March 16 Some CesrTA machine studies - focused on: 4ns instrumentation and feedback 5 GeV optics Parasitic Machine Studies throughout CHES run will be used to bring newly installed hardware on-line in preparation for spring-summer running periods Next Experimental Runs and Downs May 12 June 16, 2009 Experimental Run June 16 July 22, 2009 Down (NOTE: down has been extended to allow contingency for possible gun structure replacement) Startup and CesrTA Experimental Period through September CesrTA Workshop June at Cornell Please mark your calendars! March 4, 2009 CesrTA Status Report - ILC Damping Rings Monthly WebEx 17
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