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HESR 2 Electron Cooling

HESR 2 Electron Cooling. Björn Gålnander The Svedberg Laboratory Uppsala University. Midterm Review, DIRACsecondary-Beams December 8, 2006 GSI, Darmstadt. Outline. HESR Electron cooler Present project status Outlook. High Energy Storage Ring.

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HESR 2 Electron Cooling

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  1. HESR 2 Electron Cooling Björn Gålnander The Svedberg LaboratoryUppsala University Midterm Review, DIRACsecondary-Beams December 8, 2006 GSI, Darmstadt

  2. Outline • HESR Electron cooler • Present project status • Outlook

  3. High Energy Storage Ring HESR is presently being designed in a consortium formed between FZ-Jülich, GSI and UU The electron cooler is the main responsibility of Uppsala University. • Antiproton momentum, 1.5 –15 GeV/c • Cooling to counteract PANDA pellet target • Electron cooling up to 8.9 GeV/c(4.5 MeV electron energy) • Stochastic cooling above 3.8 GeV/c

  4. HESR Electron Cooler Parameters for the HESR cooler: • The cooling force needs to be stronger than at Fermilab to counteract the internal target • Higher magnetic field • Better straightness

  5. Objective of Design Study Task 12, HESR 2: Electron cooling Description of work: An important part of the work will be to construct prototypes of several critical parts of the system. The exact content of the prototyping work will be determined in the course of the study. The CELSIUS electron cooling system, which will then be taken out of use for its purpose at the CELSIUS ring, will be used as a test bench, and will be used to test electron beam diagnostic equipment as well as to make tests related to the high-voltage behaviour of the system. Other aspects of the electron cooling system, including the method to charge the high-voltage terminal, the problems to create the requiredquality of the magnetic field and stability of the high voltage, the required ultra-high vacuum and the electron beam optics and stability of the electron beam transport will be investigated. In the final report all experience will be summarized, drawings will reflect the status of the component development, and a first design of a control system for this high power device will be suggested on the basis of the accumulated experience.

  6. Present Project Plan • Different sub-projects, responsible persons • Design high-voltage column G. Norman, A Shemyakin • Test prototype high-voltage solenoid G. Norman • Design magnet system for electron beam transport • K. Rathsman, D. Reistad • Design and test magnet field measurement systemT. Bergmark • Design vacuum chamber, make prototypeT. Bergmark, O. Byström • Design and test prototype scraperB. Gålnander, T. Lofnes, • Design electron gun and collectorG. Norman • Tests on high-voltage regulation at Uppsala Tandem Pelletron T. Bergmark

  7. High voltage solenoid prototype • Cover delivered • Coils mounted and delivered Feb. 2007 High Voltage Column Collector Gun Pellet chain HV solenoid

  8. Magnet system • Sections of 3 metres (24 m total length) • Pancake coils (normal conducting), individually adjustable to achieve 10 μrad rms straightness • Deliverable 29, Report on solenoids and toroids, delayed • Design revised, making coils smaller and less expensive, saving about 30 % of copper. • Superconducting alternative is also considered • Scraper and pick-up electrodes. • Horizontal and vertical dipole windings.

  9. Carriage prototype Magnetic Field Measurement System needed for pancake alignment • Prototypes are being manufactured • Test will be performed during 2007 Measurement carriageand sensor head Prototype test set-up

  10. Vacuum Chambers • with rails for the Magnetic Field Measuring System Test tube of 1 m, two sections of 2.8 m will be delivered week 5, 2007

  11. Scraper prototype delivered next week • Coils are being manufactured, delivered week 5, 2007 Scraper tests at the CELSIUS cooler Modification of CELSIUS cooler for scraper tests with electron beam

  12. Outlook • During spring 2007 several prototype tests will take place • Autumn 2007, test evaluation and final report work • No overall delay expected, HESR 2 will be finished by Feb. 2008. • However, the Deliverable D29, “Report on solenoids and toroids”, is delayed until 1 March, 2007, since this sub-project has been given more weight compared to the original planning.

  13. Present group members Dag Reistad, Task Leader Torsten Bergmark Björn Gålnander, Deputy Tomas Johnson Tor Lofnes Gunnar Norman Olle Byström Stefan Johnson Tord Peterson Karin Rathsman Collaboration with IKP (Ziemann, beam dynamics), MSL (Danared, magnetic field calculations), BINP Parkhomchuk et al., Fermilab, A. Shemyakin et al.

  14. Thank you!

  15. Layout 8 MeV tank 4.5 MeV tank

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