1. INTC September 2002
ISOLDE
Mats Lindroos
Mats Lindroos

2. Operation Experience of push-pull mode operation Major problems
Efficient but hard work for OP group
Major problems
Robot
GPS front-end turbo-pump
Progress with consolidation
Success of PO and CO efforts
Technical developments
Emittance characterization of ISOLDE ion sources
Mono ECR development work
Difficulties with alignment support for experiments
Mats Lindroos

3. Emittance results General conclusions
95% geo emittance and isotope current vs. anode voltage
General conclusions
Puller position important for emittance
 varies with selected ion mass
No space-charge for Itotal<3 uA
Surface ioniser
 independent on ionisation potential
Emittance dependent on surface ioniser
tube temperature
Plasma ioniser
 varies with the pressure
 varies slightly with anode potential
etc etc
95% geo emittance and brightness (top) and currents (bottom) as functions of puller position for a surface ion source.
Optimum cold plasma ion-source emitt. ~6 ·mm·mrad (95% geo, 60 kV)
for typical operation conditions
F. Wenander et al., Transverse Emittance Investigation of the ISOLDE Target Ion Sources Proc. of EMIS 14, to be published in Nucl. Instr. Meth. B.
Optimum surface ioniser emitt. ~10 ·mm·mrad (95% geo, 60 kV)
typical conditions (3 mm tube)
Mats Lindroos

4. GANIL/ISOLDE MONOECRIS I*
Within standard target unit
Present status
Plasma ignited
Beam extracted
Ar+ efficiency of 25%
Severe sparking problems!
Upgrade power supplies
Complicated puller design
Off-line tests October
On-line next year?
Design principle
Permanent magnets
RF=2.45 GHz, <50 W
Simple
Radiation sensitive
Expected performances
Aimed for noble gases and N2 and S2
Efficiency Tresponse(50%)
He ~20% 20 ms
Ne ~35% 30 ms
Ar ~95% 40 ms
Kr ~95% 40 ms
MK7 (He)<1%
+ Jacques Lettry
ISOLDE construction team
Measured beam phase-space
43  mm mrad (95%) at 30 keV
Mats Lindroos
* Original design GANIL’s MINIMONO, G. Gaubert, P. Jardin, R. Leroy
G. Gaubert et al., “MINIMONO: Ultra-compact singly-charged...”, to be published

5. ISOLDE MONOECRIS II Design principle Own ISOLDE design RF=2.45 GHz
Innovative cavity design
Current coils
Radiation robust
Unknown:
functioning
efficiency
response
stability
Modify
on-line extraction?
pumping?
Magnetic confinement (2 coils)
+ RF (2.45 GHz) + Support gas
=>
Hot electrons that ionise atoms/ moleules
Within standard target unit
Present status
Under construction
Prototype tests Jan/Feb
Design and construction
Fredrik Wenander
Jacques Lettry
Nicola Chritin
Ermanno Barbero
W. Pirkl
Mats Lindroos
Prototype of coil for B-field generation

6. Closed meeting
Congratulations to the PS division for successful operation and good management (Chairman, committee and Claude Detraz)
Number of shifts produced at present means that resources for targets are short
Problem for 2003?
The long run in 2005 cannot be fully exploited if additional budget for targets not is allocated
42 physics shifts allocated
Protons for ISOLDE Physics are planned for 181 days in 2003 compared to 192 in 2002
Report on REX-ISOLDE position document by Claude Detraz
Document to be discussed in SPC
Juha Äystö, Jyväskylä, will take over the chairmanship from the start of 2003
Mats Lindroos