high current rfq cooler-status report
DESCRIPTION
spiral 2 week 2012 presentation: http://pro.ganil-spiral2.eu/events/sp2/spiral2week-2011/presentations/rnb-1/high-current-rfq-cooler/viewTRANSCRIPT
R.Boussaid,PhD student LPC Caen, ENSICaen, University of Caen,
CNRS/IN2P3, France
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
GANIL/SPIRAL 1
DESIR Facility RIB production building
LINAC
S3
NFS
SHIRaC
SPIRAL 2 Week 24 janvier 2011
Cooling the beam by the buffer gas+ RF
R ~22000 R ~14400
SPIRAL 2 Week 24 janvier 2011
U SHAPED HRS
COOLER
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
Intense beams(~µA) New RF technology to handle the beam
µASpace charge effect MHz HV Breakdown phenomenon Injection/extraction Gas diffusion
High voltage RF(a few KV) High frequency RF(a few MHz)
The smallest beam emittance injected in the HRS
Transmission of at least 60%
Emittance ~1π.mm.mrad The energy spread must be ~1eV
SPIRAL 2 Week 24 janvier 2011
Slow control: automatic radiofrequency
RFQ Cooler started to be built in 2009 Objec&ves
Mass 133Cs+ 60 %
Emittance at 60 KeV (π.mm.mrad) ~1
Energy spread ~1 eV
Maximum Intensity(nA) ~µA
Inner Radius=5mm Length=725mm 3m
SPIRAL 2 Week 24 janvier 2011
Vrf max = 5KV maximum frequency = 5 MHz
Breakdown insulator ~ 8 KV Ceramic insulator burning
SPIRAL 2 Week 24 janvier 2011
PRFQ(Pa) Pinjec&on(Pa) P extrac&on(Pa) Gain vaccum %
Old conBiguration 2 0.007 0.005 40
New conBiguration 2 0.004 0.002
Old conBiguration 3 0.01 0.008 30
New conBiguration 3 0.007 0.005
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
HRS RFQ Cooler ? 1m
SPIRAL 2 Week 24 janvier 2011
Number of sec&ons 3
Transmission % 53
EmiAance (π.mm.mrad)
1.6
Size system (mm) 440
Distance (mm) 140
HT max(V) 4010
The transmission and emittance are good enough for nominal operation of the HRS. Only the triplet system operates with low voltage ~ 4 KV The distance between last quadrupole-slot is enough to setup the necessary equipment.
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
80 mm 60 mm 160 mm 60 mm 80 mm
5 m
1.5 m
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011
HRS
Triplet quadrupoles
RFQ Cooler
SPIRAL 2 Week 24 janvier 2011
SPIRAL 2 Week 24 janvier 2011