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 (www.cenbg.in2p3.fr/desir) EURORIB meeting, 10 June 200
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DESIR Progress Report DESIR hall details defined for civil construction: - compressed air, liquid nitrogen, cooling water, etc detailed layout of RFQ-HRS.
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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 (www.cenbg.in2p3.fr/desir)
EURORIB meeting, 10 June 2008
Spiraland
GANIL
S3
DESIR
Level -1
Level 0
15 m
Production building
Accelerator
NFS S
RI
SPIRAL2 layout
Production building
F. Varenne
Spiraland
GANIL
S3
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– Imax ~ 50 nA
SimulationFirst Part:• Code developments including RF fields, microscopic approach for
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
Wo
rkin
g p
ress
ure
DN160 Flange
Micrometric screw 2µm
Electrodes Ø7
Insulator
2 SHV
• No RF breakdown :– For Etching polishing under
3600Vpp and 15Pa
– For Ra 1.6 under 3400Vpp and 12.5Pa
Beam transmission (Jun 08)• Cooler in RF-only : 10 % for 23Na+ and 133Cs+
• Transmission vs RF voltage for 133Cs+ :
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 = 20000
3 x’s, 3 y’s, 3 ’s, 3 ’s, 1 mass, 1 energy
3 mm mrad, 50 keV
3 mm mrad, 50 keV
R = 22091
Initial and final beam envelopsFirst and fifth order mass separation for 1/20000 mass difference
0.2 mm shift of multipole: significant loss in mass resolution