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

GANIL/SPIRAL 1

DESIR Facility RIB production building

LINAC

S3

NFS

SHIRaC


Cooling the beam by the buffer gas+ RF

 

 

R ~22000 R ~14400


U SHAPED HRS

COOLER


  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


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


 Vrf max = 5KV   maximum frequency = 5 MHz

 Breakdown insulator ~ 8 KV  Ceramic insulator burning


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


HRS RFQ Cooler ? 1m


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.



80 mm 60 mm 160 mm 60 mm 80 mm

5 m

1.5 m



HRS

Triplet quadrupoles

RFQ Cooler

high current rfq cooler-status report

Technology

ev spiral

france spiral

u shaped hrs cooler

hrs rfq cooler

hrs transmission

new conbiguration

old conbiguration

kv maximum frequency