Technical report for ISOLDE Mats Lindroos on behalf of the ISOLDE team

Outline Shutdown work R&D priority list from upgrade group R&D work at ISOLDE Start-up with new control system REX integration, R&D and operation Technical support for ISOLDE experimental area Towards the future

Shutdown Smooth shutdown with repair (and re- installation) of GPS front-end completed Major “un-scheduled” power cut during start-up phase –ISOLDE facility “survived” –Major additional work for ISOLTRAP Broken computers –New emergency power-cut procedures in the process of being established

R&D priority list ISOLDE upgrade group has established a priority list for ISOLDE R&D – upgrade.web.cern.ch/is olde-upgrade/

Priority 1

ATB-IF R&D P-induced shock waves recorded on Ta, Pb (10 mm diameter cylinders) and CNGS shape Graphite targets. Perpendicular velocity measured every 200 ns, total movement ~30 microns. (Analysis on-going). Laser induced cavitations in Water jet were measured, (Analysis on-going). Systematic off-line target tests were extended to emittance measurements and stable mass-scan analysis (test results available on the web). To ease stable beam exercise of surface ion-sources a mass-marker will be systematically added. Off-line test of a solid state laser RILIS under way, emittance and absolute ionisation efficiency. (Kim, Thomas, Klaus & ATB-IF) Front-end 6 being assembled (completion end of June) extended stable beam tests are foreseen (sept). Pre-study of target vessels, ion-sources feed trough and connectors for 10 micro A beam started. The emitance of a standard LaB6 negative surface ion-source was measured as a fuction of the electron suppression

AB-OP ECR source modified and commissioned for 2004 run –RF generator fault prevented Ar tests in April RFQ cooler design completed –Fabrication of main vacuum vessel in Mainz –Discussion with LMU for fabrication of remianing pieces –Off-line source from MISTRAL mounted in building 275 (with faraday cage) for tests –Grant application in UK (Manchester) for power suuplies, RF generator and Vacuum system

1. Laser Beam Control On-line control of laser beam positioning using CCD cameras: “Laser Imager” program is available in the new Linux-based control system Image of UV beam at the CCD camera Shutdown : RILIS Development

2. New ionization schemes a.Dysprosium Step 1 –  = nm – scanned Step 2 – 2 = nm – scanned Step 3 – 3 =510.6 & nm (CVL) - fixed b. Yttrium Step 1 –  = nm (2  ) – scanned Step 2 – 2 = nm – scanned Step 3 – 3 = nm (CVL) - fixed RILIS efficiency = ~ 20% RILIS efficiency = 80 x surface ion source efficiency Optimal ionization schemes nm nm nm Ei=6.22 eV nm nm Ei=5.94 eV Dy Y nm nm Shutdown : RILIS Development

REX-ISOLDE All REX posts allocated Work package plan for Operation, maintenance and R&D established Working group (AB management) to follow full implementation of REX as a CERN facility Migration of FEC from W95 to XP –Agreement made for CO post Shutdown work completed –R&D on molecular beams, good results for SeCO and AlF R&D on cooling in REX trap –Hardware upgrade of EBIS (baking system, realignment, interlocks etc) –Mass separator - new beam diagnostic boxes –Commissioning of 9 gap IH structure New ideas for further upgrade being discussed

Beam preparation with REX-TRAP Dipolar ExcitationQuadrupolar excitation Rotating Wall cooling (Investigated method) B Cooling method tests Lorentz force is compressing the ion cloud Sideband cooling (actual method) buffer gas buffer gas +  c quadrupolar rf field in the transversal plane  c = q/m B EE Accumulation CoolingEjection Cooling by buffer gas collisions mbar Ne P. Delahaye

Charge exchange process 40 Ar + ions Sideband excitation 78 Kr + ions 130 Xe + ions Of interest for the « ion catcher » devices Cooling by buffer gas collisions mbar Ne Molecule cooling for contaminants free beams SeCO +, and AlF + molecular beams tested SnS + to be tested P. Delahaye

TOF SeCO

New control system New LINUX/JAVA based control system commissioned for ISOLDE –Scanners and wire grids still running under windows on dedicated consoles W95->WXP Please check USERS applications for XP compatibility For “introduction” and feed-back please contact Tim Giles

New controls

Technical support at ISOLDE Re-organization of technical support for ISOLDE in progress –Experimental area section in ATB group and new OP EIC post –Work package plan for all technical support for operation, maintenance and R&D in the experimental area established –More at next meeting…

Towards the future… Tendering in progress for hall extension –Building start July 2004 –Work on hall partition (with dust barrier) from 1 January to 15 March 2005 Class A lab under construction –Work on partition 15 November to 15 February 2005