1 / 11

Vacuum system Available beam scraper Beam dimensions, Target cell

DORIS. Vacuum system Available beam scraper Beam dimensions, Target cell Machine Studies on February 7 th 2009 Further machine studies. Straight section from the arc to the IP. Main source of synchrotron radiation. Horizontal scraper. Vertical scraper. Horizontal scraper.

hilda-brooks
Download Presentation

Vacuum system Available beam scraper Beam dimensions, Target cell

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DORIS • Vacuum system • Available beam scraper • Beam dimensions, Target cell • Machine Studies on February 7th 2009 • Further machine studies Olympus Meeting at DESY, F.Brinker

  2. Straight section from the arc to the IP Main source of synchrotron radiation Horizontal scraper Vertical scraper Horizontal scraper Olympus Meeting at DESY, F.Brinker

  3. Horizontal and vertical scraper Water cooled copper rod, 30mm diam. Olympus Meeting at DESY, F.Brinker

  4. Acceptance and Beam sizes at 4.5 GeV ( σ~E ) The acceptance, defined by existing aperture limitations, is a bit larger than the space needed for the injection Olympus Meeting at DESY, F.Brinker

  5. Vacuum system Adapter chambers new position new position valves to be removed current position current position Olympus Meeting at DESY, F.Brinker

  6. Geometry of new IP region may be a bit more Olympus Meeting at DESY, F.Brinker

  7. Machine studies on February 7th • Injection into 10 bunches • Final current 170 mA after 6 minutes • Varying efficiency – probably due to effects at DESY: • DESY operated at normal maximum energy of 4.5 GeV • At 2.3 GeV the beam is not fully damped to its equilibrium emittance • Possibly beam blow up due to resonances • Room for improvements: • New power supplies with higher stability • Extraction when beam is decelerated • Optimization of top energy Olympus Meeting at DESY, F.Brinker

  8. Machine studies on February 7th Stored beam with good conditions: • I = 150 mA • Lifetime = 8.5 hours Not so nice: Longitudinal beam excitation (oscillation with ~1cm Amplitude) Limits lifetime at higher currents maybe increased particle background Olympus Meeting at DESY, F.Brinker

  9. Vacuum pressure in cavities 3.1/3.2 Observation: Pressure increase at cavities 3.1/3.2 Probable explanation: The high bunch currents excite a higher order mode in these cavities – leading both to an pressure increase and a longitudinal beam excitation Olympus Meeting at DESY, F.Brinker

  10. Longitudinal oscillations at 4.5 GeV Increased cavity temperature Test: reduced temperature of Cav. 3.2 Olympus Meeting at DESY, F.Brinker

  11. Further machine studies in 2009/10: • Injection at 2.3 / 2.0 GeV • Maximize transport line transmission • Optimize DESY parameter • Try to eject during deceleration • Longitudinal Oscillations • Effect of cav. temperatures at 4.5 GeV • Installation of second RF-amplifier for long. FB ( July 2009 ) • Repeat measurements at 2.3 / 2.0 GeV • Scraper studies ( with background counters ? ) • Simulate dimensions of target cell • Verify beam sizes/ acceptance with scrapers at low energies • Injection tests with closed scrapers ( background spikes? ) Olympus Meeting at DESY, F.Brinker

More Related