1. ISOLDE Technical report for INTC 21/5/2007
Mats Lindroos
Mats Lindroos

2. Outline Change of responsibilities at ISOLDE Shutdown work
Off-line upgrade
REX status
Technical R&D at ISOLDE
Mats Lindroos

3. New responsibilities at ISOLDE
Technical coordinator
Richard Catherall
REX ISOLDE superintendent
Fredrik Wenander
ISOLDE hall superintendent
Erwin Siesling
New projects and INTC matters
Mats Lindroos
Mats Lindroos

4. Major 2006/7 Shutdown tasks
Yearly facility maintenance: water and power (HT)
Instrumentation: migration to linux of scanners & wiregrids
Front-Ends: repair of the boris-tubes insulators (R. Catherall)
Mini-move: mini-ball into the extension 170 (D. Voulot)
REX maintenance: upgrades and repair (F. Wenander)
RFQ installation: prim pumps into HRS zone (E. Siesling)
Various work: laser windows, PLC update, ADC replace,etc.
Mats Lindroos

5. Improvement on the shutdown
Dedicated and responsible person appointed for each major task
Weekly technical shutdown meeting
Close follow-up and adaptation of the planning
Daily start-up meeting at beginning of the run
Mats Lindroos

6. Results 2007 smooth start-up No hardware failures or over-run of work
Expected software debugging (i.e. scanner & wiregrids applications)
BUT.. Unexpected (minor) controls problems (PS wide, AB/CO addressed)
Mats Lindroos

7. Off-line separator upgrade
New magnet coils to replace old faulty coils
Survey points for the alignment of the offline separator installed and documented
New beam diagnostic chamber with mechanical slit system and “ISOLDE type” scanner installed
Special thanks to Jerome Sarret,
Erik Asen, Antony Newborough, Michel Duraffourg
Mats Lindroos

8. Automatic mass program
Labview based control system communicating directly to PLC’s via RPC server
Response time:
CCV to PLC <900ms
Refresh rate 100ms
Automatic mass program
15 minutes for masses with 0.1 mass unit resolution
Mats Lindroos

9. REX low energy stage Trap EBIS
Operational and in standby mode. Minor improvements during shutdown. Have delivered some stable beam to Witch.
EBIS
The general power cut in March partly vented the machine preventing us from doing further electron beam tests with the post anode.
The newly inserted cathode did not perform as expected and had to be exchanged. 
The machine is up running with a new cathode. Beam has been injected and extracted through the separator
The old control system has been exchanged to a AB supported system.
Still running with a temporary application programme
Mats Lindroos

10. The constant “quest” for efficiency
7Li
238U
27Al
116Cd
Efficiencies for beams 2006
Tot. eff. = Trap × BTS × EBIS × Sep
 REX low energy stage now covers A=7 to >200 with total efficiencies of at least 5%
 High current beams can now be charge breed with some efficiency
(e.g. 1.8% for a 3nA 7Li+ beam into 7Li3+)
 Light ions still difficult to breed ≤5%
-> Charge breeder : generally aiming for 10% total efficiency!
-> Linac efficiency 70-85%
(aim for >80% in 2007)
Mats Lindroos

11. Isotopes and elements run at REX so far…
8Li3+,9,11Li2+
10,11,12Be3+,4+
17F5+
24-29Na7+
29,31Mg9+, 28,30,32Mg8+
68Ni19+
67-71,73Cu19+,20+,20+,19+
80Zn21+, 74,76,78Zn18+
70Se19+
88,92Kr21+,22+
108In30+
108,110Sn27+,30+
122,124,126Cd30+,31+
138,140,142,144Xe34+
148Pm30+
153Sm28+
156Eu28+
Mats Lindroos

12. * Phase 1 = First phase of a full installation
Minimove - Phase 1
Installation in progress!
* Phase 1 = First phase of a full installation
(linac upgrade, recoil separator, HIE-Isolde…)
* Goals :
1. create space (linac upgrade, space around experiments)
2. improve shielding from X-ray background at Miniball
3. improve beam properties
-> more focussing
-> more beam diagnostics
-> realignment of beamlines
New section
Mats Lindroos

13. Beam optics calculation 9-GP to MB target * 3MeV/u A/q3.5
* 0.6π.mm.mrad normalised
* ±1% energy spread
Diploma Thesis by T. Arronsson
Mats Lindroos

14. Linac emittance measurements
Results
* Normalised transverse emittance (2σ RMS) = 0.21±0.07 π.mm.mrad at 2.2MeV/u
* Low intensity few 100pA (no space charge effect in EBIS!)
* Horizontal emittance larger than vertical after the bender (energy spread)
* Emittance increased when going from 1.2 to 2.2 MeV/u (mismatch between IHS and 7gaps?)
* Emittance increased with stripper foils
Y direction after 2.5m drift
MeV/u
Energy spread = ±0.03MeV/u
@ 2.97MeV/u (±1%)
Continuation 2007
* Verify results with uninterrupted
measurement series
* Verify influence of EBIS operation
conditions on the emittance
* Measure at 3MeV/u and 300keV/u
Mats Lindroos

15. Technical R&D at ISOLDE
Dual transfer lines
Merging of neutral beams
Mono ECR
Tendering for new solid state laser for RILIS
Progress on LARIS installation
ECR PHOENIX charge breeder development
RFQ cooler off-line commissioning
Mats Lindroos

16. Background >5nA 2<A/q<7
Results CW
Pulsed
86Kr13+
86Kr %
132Xe18+ 1%
Preliminary
Afterglow
4<A/q<8
h=2-7% CW
DV tuning
Stable background
Background >5nA 2<A/q<7
P. Delahaye et al., RSI 77 03B105 (2006)

17. ~5p·mm·mrad 90% emittance ~30p·mm·mrad 90% emittance as input
RFQ cooler “ISCOOL”
Continuous mode
Emittance meter
~5p·mm·mrad 90% emittance
~30p·mm·mrad 90% emittance as input
Ongoing tests with the bunching mode
Last off-line tests with a FEBIAD source delivering noble gas ions
RFQ cooler
Ion
transmission
Li+
17%
Na+
27% K+
60%
Cs+
70%
E. Mané, H. Frånberg,
P. Delahaye
Alkali ion source