high current rfq cooler-status report

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