SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

Enhancements in ISCOOL: New Radio Frequency Quadrupole Cooler and Buncher at ISOLDE

hume avatar
hume
20 diapositives · 349 Views · Sep 27, 2014

This presentation outlines the latest advancements in the ISCOOL system, featuring a new Radio Frequency Quadrupole (RFQ) Cooler and Buncher implemented at ISOLDE. Key improvements include enhanced transmission efficiency, beam tuning, and the integration of RF control systems. The RFQ employs a quadrupolar field for ion confinement, achieving significant reductions in beam emittance and improved cooling and extraction times. Results from offline tests indicate effective ion bunching and high yield measurements for isotopes, paving the way for future upgrades in ion source technology at ISOLDE.

#enhancements in iscool: new radio frequency quadrupole cooler and buncher at isolde #enhancements in iscool: new radio frequency quadrupole cooler and buncher at isolde ppt #powerpoint #presentation
Enhancements in ISCOOL: New Radio Frequency Quadrupole Cooler and Buncher at ISOLDE - slide 1
01 / 20Enhancements in ISCOOL: New Radio Frequency Quadrupole Cooler and Buncher at ISOLDE
1 / 17

Télécharger la présentation

Enhancements in ISCOOL: New Radio Frequency Quadrupole Cooler and Buncher at ISOLDE
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. Results with ISCOOL a new Radio Frequency Quadrupole Cooler and Buncher at ISOLDE P. Delahaye, H. Frånberg, AB-OP-PSB, ISCOOL, COLLAPS, ISOLDE collaboration ISOLDE WS 2007

  2. Where at ISOLDE ISCOOL ISOLDE WS 2007

  3. Installation in pictures ISOLDE WS 2007

  4. INSTALLATION • Implementation of the RFQ into the ISOLDE vacuum system. • Construction of HV platform and HV cage of the RFQ. • Standard controls in the working sets: QP arrays for the RFQ and for the beam tuning after the cooler. • RF and gas still on LabVIEW. ISOLDE WS 2007

  5. OPERATION OF ISCOOL • Set-up by the ISOLDE operators. • Improved transmission past the switchyard  Improved (faster and easier) set-up for the beam to the experiments ISOLDE WS 2007

  6. Principle • Three elements: • RF quadrupolar field • Radial confinement • DC potentials • Extracting ion in bunches or in continuous mode • Buffer gas •  Ion motion cooling ISOLDE WS 2007

  7. Transmissions • Potentials along the axis 5-2V/cm 50V (30V enough) 80eV TRAPPING INJECTION ~1E-2 mbar 4He 10-2mbar l/s EXTRACTION Transmission dependence on the emittance of the ISOLDE ion sources. ISOLDE on-line surface ion sources has smaller emittance than ISOLDE FEBIAD ion sources (<25 π·mm mrad). The off-line tests were performed with an ion source with ε = 35π mm mrad ISOLDE WS 2007

  8. Bunching mode 50V (30V enough) 5-2V/cm 80eV 30-60 keV TRAPPING ~1E-2 mbar 4He 10-2mbar l/s INJECTION EXTRACTION ISOLDE WS 2007

  9. Cooling time • TOF < 1ms from the entrance to the exit of the RFQ • No losses for short lived ions. • 1 passage is enough to get a cold beam • as measured off-line, and other labs as predicted by simulations for other systems ISOLDE WS 2007

  10. Emittance measurements (off-line) • 10 x decrease of the beam emittance • The worst case scenario at ISOLDE is the FEBIAD ion source with >25 p·mm·mrad emmittance. • Injection efficiency into the cooler is depending on the beam emittance from the ISOLDE target and ion source unit. ~35p·mm·mrad 95% emittance ~2.2p·mm·mrad 95% emittance ISOLDE WS 2007

  11. Space charge limits • Up to 108/s!! As measured with FC (data under analysis with MCP) 23Na 85Rb 39K, Collection time=10 ms–1 sec Extraction time 150 us ISOLDE WS 2007

  12. Bunch width Depends on the space charge and cooling time Collection time=cooling time ISOLDE WS 2007

  13. Yield measurements • 26Na T1/2=1.07 s • 48K T1/2=6.8 s • Yields in continuous mode: • 26Na :1.2e6 at/uC • 48K: 2.2e4 at/uC • Yields in bunched mode • analysis under progress ISOLDE WS 2007

  14. HOT SPOTS ISOLDE WS 2007

  15. Results • High transmission efficiencies • Easy beam tuning to experiments • Yield measurements continuous vs. bunched mode • Losses due to trapping time (analysis in progress • First measurements with radioactive isotopes performed together with COLLAPS (see next talk) ISOLDE WS 2007

  16. ISOLDE HRS + Cooled beams ISCOOL HRS ISOLDE WS 2007

  17. Outlook Up to October 2007: From Nov. 2007: Next step: Upgrade of HRS Mag 90: EURISOL HIE Isolde: ISOLDE WS 2007

  18. Thanks to: AB-OP-PSB-iso team: Pascal, Erwin, Magnus, Emiliano and Tim. AB/ATB AB/CO AB/PO AB/VAC SC/RP ISOLDE collaboration COLLAPS collaboration ISCOOL collaboration ISOLDE WS 2007

  19. ISOLDE WS 2007

  20. ISCOOL tests with COLLAPS 46K Beam 1E5 ions/s after the cooler. Collection time 20 minutes, with 300ms bunching and a 12us gate and 2mW of laser power. Bunched:12us gated spectra Singles (continuous counting) Background suppression factor~1E4 ISOLDE WS 2007