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ISOLDE
Technical report for
INTC 21/5/2007
Mats Lindroos
Mats Lindroos
Outline
• Change of responsibilities at ISOLDE
• Shutdown work
• Off-line upgrade
• REX status
• Technical R&D at ISOLDE
Mats Lindroos
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
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
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
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
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
• 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
0-160 with 0.1 mass
unit resolution
Mats Lindroos
REX low energy stage
• Trap
– 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
The constant “quest” for efficiency
20.0 Efficiencies for beams 2006
REX low energy stage now covers A=7 27Al Tot. eff. = Trap × BTS × EBIS × Sep
to >200 with total efficiencies of at
15.0
least 5%
116Cd
%
High current beams can now be 10.0
charge breed with some efficiency 7Li
238U
(e.g. 1.8% for a 3nA 7Li+ beam into 7Li3+) 5.0
Light ions still difficult to breed ≤5% 0.0
0 50 100 150 200 250
A
-> Charge breeder :
generally aiming for 10%
total efficiency!
-> Linac efficiency 70-85%
(aim for >80% in 2007)
Mats Lindroos
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
Minimove - Phase 1
* Phase 1 = First phase of a full installation
(linac upgrade, recoil separator, HIE-Isolde…)
Installation in progress!
* 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
New section
-> realignment of beamlines Mats Lindroos
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
Linac emittance measurements
Results
Y direction after 2.5m drift
* Normalised transverse emittance (2σ RMS) =
0.21 π.mm.mrad @ 2.2MeV/u
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
Energy spread = ±0.03MeV/u
Continuation 2007 @ 2.97MeV/u (±1%)
* Verify results with uninterrupted
measurement series
* Verify influence of EBIS operation
conditions on the emittance
* Measure at 3MeV/u and 300keV/u
Mats Lindroos
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
Results
CW Pulsed
86Kr13+
Afterglow
CW 86Kr13+
2.2%
4<A/q<8 18+
132Xe
h=2-7% 1%
Preliminary
DV tuning Stable background
Metallic ions Mass Scan
Noble gas 350
H+ O6+ O5+ O4+C3+ C+
300
I/Imax n+ beam
250
1+ beam
200
Extraction
I (nA)
voltage 150
100
50
0 Background >5nA 2<A/q<7
-50
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0
A/q
Plasma chamber high voltage
P. Delahaye et al., RSI 77 03B105 (2006)
RFQ cooler “ISCOOL”
Continuous mode
Emittance
meter ~5p·mm·mrad
90% emittance
• Ongoing tests with the bunching mode
• Last off-line tests with a FEBIAD source
delivering noble gas ions
~30p·mm·mrad
90% emittance
RFQ cooler as input
Ion transmission
Li+ 17%
Na+ 27%
E. Mané, H. Frånberg, K+ 60%
Alkali ion source P. Delahaye Cs+ 70%
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