DESIR Progress Report DESIR hall details defined for civil construction: - compressed air, liquid nitrogen, cooling water, etc detailed layout of RFQ-HRS room in production building first transmission tests of RFQ RF system successful tested detailed optical study of HRS S3 – DESIR beam line is established work on safety at DESIR started DESIR web pages online ( EURORIB meeting, 10 June 2008

Spiral and GANIL S3S3 DESIR Level -1 Level 0 15 m Production building Accelerator NFSNFS SRISRI SPIRAL2 layout

Production building F. Varenne

Spiral and GANIL S3S3 DESIR Level -1 Level 0 15 m Connections to DESIR

12m 8m HRS RFQ storage and maintenance Legend: Electronics Quadrupole Sextupole Multipole Dipole RFQ and HRS cave

The High Intensity RFQ Cooler SHIRaC Length = 70 cm Radius = 3mm

Test bench at LPC-Caen (Oct 07/ Jan 08) Current tests are done with ionization source –I max ~ 50 nA

Simulation First Part: Code developments including RF fields, microscopic approach for cooling, space charge Input beam : 133 Cs+ beam Emittance : 75π.mm.mrad Energy : 20keV Intensity : 1µA Cooling distance at 0.05mbar ~ 400mm Output emittance < 1π.mm.mrad Injection efficiency ~ 25 %  Acceptance ~ 35 π.mm.mrad Second Part: Two cooling sections with different r0-radius 5 mm and 3 mm + 4mm junction Same RF on the two sections Better injection efficiency (~ 100%)  Acceptance ~ 75 π.mm.mrad Same cooling effect Same emittance Better overall efficiency

RF breakdown (Jan 08/Mar 08) 2 electrodes face to face –RF amplitude –Helium pressure –Gap –Roughness Working pressure DN160 Flange Micrometric screw 2µm Electrodes Ø7 Insulator 2 SHV No RF breakdown : –For Etching polishing under 3600V pp and 15Pa –For Ra 1.6 under 3400V pp and 12.5Pa

Beam transmission (Jun 08) Cooler in RF-only : 10 % for 23 Na + and 133 Cs + Transmission vs RF voltage for 133 Cs + :

SHIRaC Modification (Sep 08) Additional pump  Low pressure at injection and extraction electrodes Gaz injection Emittance measurement  more details on the poster of F. Duval

Mass resolution: M/  M = x’s, 3 y’s, 3  ’s, 3  ’s, 1 mass, 1 energy 3  mm mrad, 50 keV

R = 22091

Initial and final beam envelops First and fifth order mass separation for 1/20000 mass difference

0.2 mm shift of multipole: significant loss in mass resolution  more details on the poster of T. Kurtukian Nieto

DESIR layout 17/04/08 Laser room (mezzanine) DAQ room Meeting room (on top of DAQ) Kitchen (on top of CR) Control room MLL trap Collinear Laser spectroscopy  -NMR RFQ bun- cher off-line source 1 off-line source 2 Penning trap + Decay setup Paul trap Beam from SPIRAL1 Beam from S3 Beam from Production building General purpose Electronics Desk Access 5 m Level -1 Level 0 TAS Neutron ditch Level -1 Crane access to basement Double MOT General purpose IS Identification station with tape LN2 Gas & waste storage LUMIERE BESTIOL

Supply Electri- city Work- shop Gray Room 2 Gray Room 1 Assembly Room 3 Control Racks Inter- faces HV supplies Crane access to basement Stor- age 1 Assembly Room 2 Assembly Room 1 Stor- age 2 free 5 m free Neutron ditch DESIR Level -1 Limits DESIR hall free