1. A. Herlert, CERN PH-SME-IS
ISOLDE scientific coordinator’s report
ISCC meeting, February 4, 2010
A. Herlert, CERN PH-SME-IS
Running statistics 2009
Status of experiments
HV platform renovation
Status ISOLDE web page

2. ISOLDE schedule 2009 (Apr 20 - Nov 23)
Requested shifts:
662 in total
96 different beams
627 for 51 experiments
Scheduled shifts (~70%):
463 in total
62 different beams
437 for 39 experiments
REX-ISOLDE:
273 shifts requested
140 shifts scheduled
9 experiments (8 runs)
additional WITCH runs
(need REXTRAP)
GPS
HRS

3. ISOLDE beam time summary 2009
ISOLDE delivered 350 RIB shifts
288 (82.3%) for INTC experiments
62 (17.7%) other
Standard target check + TISD + REX-MD
Coordinators reserve: debugging, recovery, tests, LOIs
40 research projects (IS experiments) – 6 with no beam
2 LOIs
Integrated # protons
6.65E+19
Running for 223 days
More requests for GPS

4. PSB septum leak (no target change)
RIB overview GPS/HRS 2009
PSB septum leak (no target change)
and PISOMOVE problem
LINAC2
vacuum
problem
HRS frontend
blocked
Power cut and
severe vacuum
problems
on/off-time from
radiation monitors
52% of possible
RIB shifts used
(1.57 shifts/day)
(55% in 2006
61% in 2007
56% in 2008)
223 days of on-line operation

5. ISOLDE shift distribution 2009

6. ISOLDE shift distribution 2000-2009

7. Shift distribution
Number of shifts

8. Key resources: targets 2009
Actinide targets
218 shifts (out of 350) [62%]
12 new units + 2 old (one not used)
In total 27 targets
23 new units
2 not used

9. Key resources: RILIS 2009 155.5 total RIB shifts
152 shifts for INTC experiments
~2000 hours for online work
includes setup, yield checks, etc.
>2100 hours total running time (incl. off-line tests)
20 IS experiments (13 runs)
Beams: Mn, Be, Ga, Ag,
Nd, Po, Mg, Sn,
Zn, Ni
(all with Nd:YAG)

10. REX-ISOLDE 2002-2009 91 RIB shifts delivered to experiments
+ 5 RIB shifts for development

11. New and closed experiments at ISOLDE
Update November 2009 meeting
76 shifts out of 146 approved
4 new experiments IS495 - IS498
ISOLDE experiments to be closed
IS410, IS420, IS438, IS461, and IS470

12. Accelerator schedule 2010 (V1.3)
ISOLDE dates:
protons from PSB April 26
physics start ISOLDE April 29
protons stop November 22
(i.e weeks for physics
as compared with 31 weeks
in 2009)
Longer shutdown period
due to new HRS front-end
and new vacuum system
Several long periods of MD
partly with parasitic beam to
ISOLDE (not guaranteed)

13. Follow up: floor space for experimentsHV
PLAT-
FORM
ISOLTRAP
MISTRAL
COLLAPS
CRIS Em Ch
MINIBALL
NICOLE
ASPIC
TAgS
WITCH b

14. Status of experiments - MISTRAL
Clean-up ongoing
RFQ buncher and cooler of
MISTRAL removed (shipped
to University Mainz)
Removal of 22t magnet
planned in March 2010
(opening to hall extension
needs to be enlarged by
50cm – work to be done
in February 2010)
Oct 2009

15. Status of experiments - ASPIC
ISOLDE group owner of equipment
LOI submitted and will be discussed at
February 2010 INTC meeting

16. Status of experiments - HV Platform
Nov 2009
Can only be used for collections
Acceleration stage not functional
Need new transformer?
Check vacuum system
Renovation of
HV platform needed
Information collected
by Karl Johnston

17. HV Platform – present location
Located in the middle of the hall, between CRIS and ISOLTRAP

18. Status Collection chamber
Platform consists of a (no-longer used) cryostat and a small collection chamber
Components on the platform are powered via an external motor when whole system is under high voltage
However, present setup not very user-friendly (vacuum, general operation) - beam optics a problem
Occupying large floor space, relative to use
Safety report from 2009 not very positive
Cryostat
External
motor

19. Some history Since 2007, HV power supply has been broken
The present platform was designed and constructed for a specific experiment (IS303).
Originally mounted in ISOLDE-3
Due to budget restrictions most of the components of the existing installation were taken from equipment available at CERN.
Only the driving motor for the power generator was obtained commercially.
Quoted performance parameters
High Voltage:
Design aim: 400 kV
Tube limitation: 500 kV
HV Generator: 300 kV
Resistor chain: 260 kV
Practical limit: 220 kV
3-Phase Power Generator: 7 kW
Optical links used: GPIB, ETHERNET, TTL pulses
Since 2007, HV power supply has been broken
Only collection point has been used (sparingly)

20. Is there a need for a post-accelerated (non-REX) beam?
YES: High Voltage platform for TISD
(HIE)-ISOLDE offers the largest choice of ISOL beams; it should further
be extended.
TISD can offer higher intensities for many exotic beams.
The High Voltage platform (up to 260kV) is used to deduce release
properties of new targets with implanted long-lived radiotracers and off-
line gamma spectroscopy.
Required for all release-type studies exploring new targets
Example: 17F at REX ISOLDE produced from sub-mm SiC target for Astrophysics. Production tests involved implantation depth dependences for release properties

21. Solid state Physics: maybe, but probably not with current setup
Majority of current experiments do not require post-acceleration:
Post-implantation, most experiments require annealing to repair implantation damage. This diffuses ions further into the material (generally, rare earths in Si an exception).
For samples studied using optical spectroscopy (e.g. ZnO), too deep can be a disadvantage as laser only absorbed within 100s of nms from surface.
Recent experimental demands have been for beam retardation rather than post-acceleration.
Where it could be useful:
In principle, better focussing of the beam.
Implantation into specific layer of multi-layered structure.
For electrical measurements of semiconductors: implantation deeper removes possible surface effects.
b-NMR studies for solid state physics.

22. Possible alternatives?
Construct more user-friendly setup at one of the GPS collection points?
New solid state physics BMBF proposal describes a new collection chamber. Could, in principle, be modified to accommodate post-acceleration.
Smaller form factor, more standardized components…
Older plans were drawn up to enhance existing setup by taking highly-charged EBIS beams to reach higher energies…2 most realistic options were:
e.g. after old ECR on GHM was mooted, but this opportunity has been lost.
Or to left of REX LINAC, area around ASPIC/TAGS, space and existing installations a problem though.
In summary, HVP would be welcome for users – especially for target development – but not sure if investing in current setup is the best way to proceed
However, very important to retain collection point on HRS

23. New location for HV platform ?
TO GHM ?
ISOLTRAP
MISTRAL
COLLAPS
CRIS Em Ch
MINIBALL
NICOLE
ASPIC
TAgS
WITCH b

24. Status ISOLDE web page
New web page presently located at:
Will be moved to new location next week
Many pages still not up to date
 Work in progress – Suggestions are appreciated