Transcript M_Kowalska.ppt

ISOLDE scientific coordinator’s report
ISCC meeting, November 4, 2010
Running period 2010
Status of INTC shifts
Accelerator schedule 2011
Long shutdown (2012 or 2013)
Status of ISOLDE experiments
New ISOLDE web page
Magdalena Kowalska, CERN PH-SME-IS
ISOLDE experiments and requests 2010
INTC February 2010
• 5 new experiments: IS499 – IS503
• 132 approved RIB shifts (out of 183 requested)
• 8 experiments completed (3 REX experiments):
IS381, IS414, IS415, IS417, IS418, IS425, IS431, IS469
 69 active experiments for 2010 beam period
INTC June 2010: 34 HIE LOIs
INTC November 2010
• 189 shifts requested in new proposals and addenda
• 21 shifts requested by LOIs
ISOLDE schedule 2010 (May 6 - Nov 21)
~29 weeks for physics
vs 31 weeks in 2009
Requested shifts:
• 667 in total
• 93 different beams
• 627.5 for 50 experiments
Scheduled shifts (~73%):
• 480 in total
• 75 different beams
• 443 for 41 experiments
REX-ISOLDE:
• 432 shifts requested
• 160 shifts scheduled (~37%)
• 11 experiments (7 runs)
• additional WITCH runs
(need REXTRAP)
GPS
HRS
Main problems in 2010 (I)
TISD on Sm RILIS and target
test: no laser ionised Sm visible
SSP collections with YO HP target:
Strong stable contamination, not
much physics output, but promising
yields of Fe and Cr beams
YO CP target for 1st REX-ISOLDE
run: 9C yield dropped quickly after
start – run not successful – need
target tests
ZrO target with RILIS for Ga at
COLLAPS: Target broken right
before on-line run – cancelled
WITCH run on Ta W target: Very
contaminated rare-earth beam,
but some recoil spectra (on mixed
beam) could be recorded
Miniball run on 72Kr from YO CP
target: 10-fold yield drop within a
few days, strong 72Ge contamin.
GPS
HRS
Main problems in 2010 (II)
Pb HP target for SSP collections:
GLM deflection plates blocked
(broken pinion); no beam for users
ISOLTRAP run with UC CP target:
No 46,47Ar visible among very
strong stable contamination of
SC(H). No masses measured but
multi-reflection isobar separator
commissioned .
96Kr Minball run with UC CP target:
many contaminants and weak Kr
signal at Miniball but 96Kr E(2+)
observed in 2009 confirmed
202Rn Miniball run: target broke in
the middle of the run; only partial
statistics collected
220Rn Miniball run: cancelled due
to target failure during 202Rn run
GPS
HRS
Main problems in 2010 (III)
70-72Kr from YO CP target for
ISOLTRAP: No beams visible
among large Cl contamin. but
more tests with multireflection
isobar separator
30Na from UC W target to Miniball:
measured yield and counts at
Miniball much below database
value. Beam given to next user.
Mn beam for Mossbauer studies
(UC Ta): GPS HV trips above 30kV
(requested HV>50kV). Extraction
electrode exchanged and 40kV
allowed very good results.
N-rich rare earths at ISOLTRAP
(Ta W): no beam of interest found
among stronger contamination.
Another new mass measured.
Tests of high-density UC target:
GPS turbo fans go off. Pumps will
probably survive only 3-4 days.
GPS
HRS
2010 online shifts
Neutron doserate in Sv/h in ISOLDE HV room
Ca. proportional to proton intensity at the target
=> Upper limit on online shifts delivered until November 1: 320-330 shifts
Shift backlog after Feb10 meeting : 877 shifts
Assuming that until end of 2010 we will have delivered around 350 shifts
=> Shifts remaining for 2011: around 530 + shifts approved in November
=> above 700 shifts to be scheduled
Accelerator schedule 2011 (draft)
ISOLDE dates (still prelimin.)
protons to ISOLDE April 25
physics start ISOLDE May 2
protons stop November 20
(i.e. 29 weeks for physics vs
29.5 in 2010)
Shutdown period used
for new GPS front-end
Several 24h injector stops
every 6 weeks.
Several long periods of
machine development
partly with parasitic beam to
ISOLDE (not guaranteed)
Long CERN-wide shutdown
One year shutdown of CERN accelerator complex
(to save money and manpower) planned for 2012
However:
- LHC runs better than expected
- CERN/LHC competitor Fermilab might run after 2011
- nobody is happy about the exact date of the shutdown
 It is very probable that shutdown is postponed to 2013, which will be better
for ISOLDE and HIE-ISOLDE. (Decision will be taken in late spring/early summer 2011.)
ISOLDE planning/running with 1-year shutdown at 2012 or 2013:
- go ahead with GPS front-end exchange in 2010/2011 shutdown
- priorities for scheduling in 2011: as normal (experiments waiting for beam
longest) + projects for a PhD thesis (in case shutdown takes place in 2012)
- INTC accepts regular proposals in February 2011 (June and November to be
discussed)
- some weeks of offline physics
Long CERN-wide shutdown
We asked operations group and directorate for access to necessary infrastructure
and support (controls, vacuum, RP, etc) for 3-4 months after the usual stop of
ISOLDE physics (i.e.December-February or March). Our request was taken note of.
Some ideas for offline physics were collected informally from various users:
Examples of requests for long-lived species:
- Extracted from ISOLDE irradiated target:
Plunger t1/2 measurements (require more beamtime, e.g. 216Po)
Decay studies of long-lived nuclides
Mass measurements (e.g. on neutrinoless double beta decay)
Tensor current search with 60Co at NICOLE
- With samples irradiated elsewhere (e.g. PSI or ILL) and using the ISOLDE
mass-selection capability and some of its experimental systems:
7Be for SSP and T-REX
Ar from irradiated Ti foil: 39Ar for astrophysics, 42Ar for MINIBALL
Ion-implanted 26Al target for astrophysics cross sections
Requests for stable beams, mainly for setup characterisation: WITCH, NICOLE
Status of experiments - ECR
ECR removal and new GHM experiment
Many ECR parts waiting for transport to GANIL shipped yesterday
Status of experiments - MISTRAL
• Clean-up continues
• 22 ton magnet moved
to CERN long-term
storage
• only electronics
and some vacuum
parts remain
Status of experiments - Beta-NMR
Beta-NMR system in place
Beta-scintillator tests
ongoing.
Foil holder and connection to
ISOLDE beamline still
missing (delays at Rehovot).
September tests with Be had
to be cancelled.
Tests of polarisation using
Coulex on stable Ne beam
done in Nov09: lower
statistics than expected,
analysis ongoing, no
polarisation code available
for comparison with data
PhD students got some data for their theses:
Christophe: Coluex on n-rich Rb isotopes
Hans: analyse part of 11Be T-REX data
Status of experiments - CRIS
• Installation completed
• Prototype experiment
for new safety structure
• Off-line run allowed
successful tests of ion
transmission
• Lasers working and
laser tables ready
• First on-line run planned
for November 2010
• New CERN PhD
student: Kara Lynch
Status of experiments - WITCH
• Additional shielding for REX mass
separator under installation (to be
tested with REX beam soon)
• Commissioning run in week 25:
recoil spectra recorded. However,
ISOLDE beam was a cocktail of
rare-earth isobars and no
identification or cleaning were
possible at WITCH
• Physics run on 35Ar scheduled
for week 46
Status of experiments - HV Platform
• Dismantled and removed
• HRS collection point to be
mounted soon (needs to be
properly shielded with concrete)
Status of experiments - GLM
• Some improvement in vacuum and
beam focusing
• New setup available and to be
installed soon
• Improvement of concrete shielding
ongoing
New ISOLDE web page
Online since September 2010:
- changes in layout and content
- missing info is filled up step by step
- some new elements, like NEWS