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Advances in Electron Cloud Instrumentation: Insights from ECLOUD 2007 Conference

The ECLOUD 2007 Workshop, held in Daejeon, South Korea, brought together 38 participants, primarily from Asian institutions alongside attendees from the US and Europe. Key discussions focused on long-lived low energy electrons trapped in quadrupole fields and their implications for accelerator physics. Presentations highlighted experimental advancements, challenges in electron cloud behavior, and progress in electron cloud studies. Findings revealed that solenoids decrease cloud density and emphasized the need for improved measurement technologies and conditioning methods in accelerators. Details and talks can be accessed online.

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Advances in Electron Cloud Instrumentation: Insights from ECLOUD 2007 Conference

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  1. ECLOUD07 Conference&Electron Cloud Instrumentation in the Main Injector Bob ZwaskaAccelerator Physics Department MeetingMay 16, 2007

  2. Long-lived electrons Low energy electrons trapped in quadrupole

  3. ECLOUD 2007 Workshop • April 9-12, 2007 -- Daugu, ROK • 38 participants • Most from Asia (KEK, KNU, China) • Several from US. (LBL, LANL, ORNL, CESR, FNAL…) • 2 from Europe – none from CERN • Presentations online at: • http://chep.knu.ac.kr/ecloud07/index.html • Talks linked in the program PDF

  4. Grooves for ILC DR Cloud density near (r=1mm) beam (m-3) before bunch passage, values are taken at a cloud equilibrium density. Solenoids decrease the cloud density in DRIFT regions, where they are only effective. Compare options LowQ and LowQ+train gaps. All cases wiggler aperture 46mm.

  5. SEY test station in PEP-II LER 0o position 45o position

  6. Compare vacuum chamber e- currents 18 March 2007 Grooves don’t work groove1 groove2 flat2 flat1 Measured e- current in TiN/Al fin/flat chambers << StSt chamber. PEP-II LER current still raising (2.7A  4A).

  7. Very Successful Conditioning (lab)

  8. Even More successful (KEK)

  9. Summary • Progress in electron cloud study, but questions remains • SE model is at the core of problems • Long lived electrons? • Excellent conditioning in lab • Not as good in accelerators • Type of conditioning matters • Still observing electron cloud worldwide • No consistent solution has been discovered

  10. Present MI Installation • Electron detector in MI straight section • Only see clear signal with highest intensities • Requires filtering • Slow signal

  11. Upgrade Plans for Shutdown • Better measurements • New cables for cleaner signal • Add data recorder (computer w/ digitizer) • New ion gauge and extra flanges for more detectors • Experimental possibilities • Add weak solenoid for suppression • Add proof-of-principle clearing electrode • Being designed presently (Alex Chen) • Probably kapton-shrouded stainless

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