Technical report for ISOLDE INTC 19 May 2007 Mats Lindroos

Outline Shutdown work –Planning –Ventilation –Water cooling system for Front-Ends –Front-End 6 –REX-ISOLDE HIE-ISOLDE –Where are we? Mats Lindroos

Shutdown planning Mats Lindroos

Start-up period Mats Lindroos

5 Major changes for 2008 Release of activated air HRS GPS Radiation monitor PMVG170C showing higher levels compared to 2 previous years Proton beam current to GPS limited to 1µA (norm. 2µA)

Modification of Ventilation System In order to reduce the activated air emissions encountered during 2007, the ventilation system has been reversed and measures have been taken to improve the air- tightness of the area. Tests to be carried out over the next few weeks. GPS HRS GPS HRS Actual situation Modification

Target Cooling Water Panel Orphan Dependant on vacuum controls. The failure of one affects the other Difficult to access (inside primary zone) No spares Maintained by ST-CV Completely independent from vacuum sequence Easily accessible during operation. Spares available Easy to operate user interface

Before > < After

Aluminium oxide blocking pneumatic systems 9 ‘Meyrin’ compressed air Isolde facility Compressed air system: Broken filter inside one of the air dryer tanks

Low energy shutdown works: main projects * REXTRAP - exchanged insulators etc at internal structure Done. Some discharges when starting up, but conditioning helps. REXTRAP - enlarge the internal differential pumping diaphragms Partially done. Preliminary test show an efficiency >60% Followed up with dedicated radioactive ion deposition test, e.g. 42K * REXTRAP - adjust and consolidate the RF excitation electronics Done, but still not possible to avoid antiresonance for all masses. -> adjust the amplifier for the desired mass range -> wait for a new version in connection with the REXTRAP upgrade * REXTRAP - proposal for complete trap consolidation Awaiting AB management decision * REXEBIS – find the reason for the LHe filling blockage Inspected inside. No blockage found. * REXEBIS – identify the reason for large N 2 peaks Much time invested. Gate valve exchanged. Peaks smaller but still present.

REX linac shutdown works IHS cavity stability above 50kW Coupling loop dismounted and cleaned, checked cavity adaptation, loop gain… -> Problem not fully solved, still too many interruption due to reflected power Linac water cooling circuits consolidation New interlocks, replacement of damaged pipes, maintenance of IHS closed circuit Amplifier cavities and RF tubes cleaning Long time without maintenance, insufficient air filtration RF room ventilation Changed to a close circuit ventilation Unfortunately the cooling unit is not adapted to this mode of operation -> Need a new cooling unit Replacement of magnetic steerers A project has been started for the replacement of the linac steerers during shutdown

REX status The whole REX machine is up running (diffciult startup as always) Tricky 9 C(O) and 10 C(O) beams first experiment -> After some struggle 10 C beam could be accelerated Linac well setup – scaleable: - A beam of 10 C was delivered at 2.9MeV/u during the first run - Sstripping foils were used 10 C 3+ -> 10 C 6+ (80% efficiency / background free) 1. Test mass separation inside the trap Improve the REX decay analyses prog. + verify this with tests 2. Beam (cw and pulsed) from RFQ cooler into REX dedicated tests necessary (no time during the startup) 3. 35Ar/35Cl suppression postponed no time before the C(O) run after the run the target ion source broke 4. Emittance measurements for linac started 5. Injection of Minimono (1 + ECRIS) into REXTRAP Diploma student A. Gustafsson Present status Immediate development projects

FE6 and Off-line Vacuum equipment installed Extensive testing of beam optics Preparation for installation –Specifications for software and hardware under way Beam energy measurement device installed for the precise measurement (+/- 0.1V) of secondary beams. Rapid gas leak valve integrated into off line to simulate effusion processes through target and ion source systems

Upgrade of RILIS lasers at ISOLDE Two dye lasers were applied at 1 st step of excitation - x 2.2 More power could be delivered to HRS target at the 2 nd step of excitation Ga ion beam has been produced with the SSL Diode Pumped Solid State Nd:YAG Lasers as replacement of Copper Vapor Lasers: Green Beams nm Yellow Beams nm CVL Green Beams nm UV Beam nm IR Beam nm SSL kHz 8 10 kHz 46% 54% 46% Improvement of ionization efficiency by SSL : And CVLs are still available for runs …

Total all parts of project

HIE-ISOLDE: Where are we? External grant from Belgium –1 engineer post – Matteo –1.3 MCHF for R&D on SC linac Second grant from Belgium approved for both physics programme and SC linac construction for HIE-ISOLDE –2.7 MCHF (540 kCHF per year for 5 years) for the SC linac construction WP in EUCARD proposal for R&D on thin film techniques –1.5 MCHF in total budget (30% from EU) –500 kCHF for HIE-ISOLDE relevant items (30% external) –Partners should be: IPJ-Polen, CI, LNL-INFN, IN2P3-IPNO, DESY Proposal in the UK to finance SC linac development and construction RFQ cooler WP and RILIS WP financed and (almost) completed Statement of Interest for proposal in the US to develop new high intenity EBIS/T for HIE-ISOLDE, FRIB, HRIBF and ISAC-II –Support letter ISC and ISOLDE UK Phd Student and Post-doc starting at ISOLDE in July Pre-study of new remote handling system in Finland, Univ. of Tampere Discussions with CERN Mgt on CERN contribution.

HIE-ISOLDE: Where are we?

HIE-ISOLDE R&D status Work has started on the main work packages, namely Cavity RF design, cavity manufacturing, cryomodule design, cryogenic system design and beam dynamics. Preparatory work on other work packages has started, we are still in line for the delivery of the Technical Design Report by end High  QWR with beam port corrected for steering effect Sputtering chamber