Technical report for ISOLDE

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Technical report for ISOLDE

• Mats Lindroos on behalf of the ISOLDE team

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Outline

• Shutdown work
• RD priority list from upgrade group
• RD work at ISOLDE
• Start-up with new control system
• REX integration, RD and operation
• Technical support for ISOLDE experimental area
• Towards the future

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Shutdown

• Smooth shutdown with repair (and re-installation)
  of GPS front-end completed
• Major un-scheduled power cut during start-up
  phase
• ISOLDE facility survived
• Major additional work for ISOLTRAP
• Broken computers
• New emergency power-cut procedures in the process
  of being established

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RD priority list

• ISOLDE upgrade group has established a priority
  list for ISOLDE RD
• http//isolde-upgrade.web.cern.ch/isolde-upgrade/

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Priority 1
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ATB-IF RD

• P-induced shock waves recorded on Ta, Pb (10 mm
  diameter cylinders) and CNGS shape Graphite
  targets. Perpendicular velocity measured every
  200 ns, total movement 30 microns. (Analysis
  on-going).
• Laser induced cavitations in Water jet were
  measured, (Analysis on-going).
• Systematic off-line target tests were extended to
  emittance measurements and stable mass-scan
  analysis (test results available on the web).
• To ease stable beam exercise of surface
  ion-sources a mass-marker will be systematically
  added.
• Off-line test of a solid state laser RILIS under
  way, emittance and absolute ionisation
  efficiency. (Kim, Thomas, Klaus ATB-IF)
• Front-end 6 being assembled (completion end of
  June) extended stable beam tests are foreseen
  (sept).
• Pre-study of target vessels, ion-sources feed
  trough and connectors for 10 micro A beam
  started.
• The emitance of a standard LaB6 negative surface
  ion-source was measured as a fuction of the
  electron suppression

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AB-OP

• ECR source modified and commissioned for 2004 run
• RF generator fault prevented Ar tests in April
• RFQ cooler design completed
• Fabrication of main vacuum vessel in Mainz
• Discussion with LMU for fabrication of remianing
  pieces
• Off-line source from MISTRAL mounted in building
  275 (with faraday cage) for tests
• Grant application in UK (Manchester) for power
  suuplies, RF generator and Vacuum system

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Shutdown 2003-2004 RILIS Development
1. Laser Beam Control
On-line control of laser beam positioning using
CCD cameras Laser Imager program is available
in the new Linux-based control system
Image of UV beam at the CCD camera
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Shutdown 2003-2004 RILIS Development
2. New ionization schemes
Optimal ionization schemes

• Dysprosium
• Step 1 l1 606 - 677 nm scanned
• Step 2 l2 606 - 677 nm scanned
• Step 3 l3510.6 578.21 nm (CVL) - fixed

Ei5.94 eV
510.6 nm 578.2 nm
607.5 nm
625.9 nm
Dy
RILIS efficiency 20
b. Yttrium Step 1 l1 407 - 414 nm (2w)
scanned Step 2 l2 565 - 677 nm
scanned Step 3 l3 510.55 nm (CVL) - fixed
510.6 nm
Ei6.22 eV
662.4 nm
414.3 nm
Y
RILIS efficiency 80 x surface ion source
efficiency
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REX-ISOLDE

• All REX posts allocated
• Work package plan for Operation, maintenance and
  RD established
• Working group (AB management) to follow full
  implementation of REX as a CERN facility
• Migration of FEC from W95 to XP
• Agreement made for CO post
• Shutdown work completed
• RD on molecular beams, good results for SeCO and
  AlF RD on cooling in REX trap
• Hardware upgrade of EBIS (baking system,
  realignment, interlocks etc)
• Mass separator - new beam diagnostic boxes
• Commissioning of 9 gap IH structure
• New ideas for further upgrade being discussed

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Beam preparation with REX-TRAP

• Cooling method tests

Cooling by buffer gas collisions 10-4 mbar Ne
P. Delahaye
Sideband cooling (actual method)
Rotating Wall cooling (Investigated method)
buffer gas buffer gas ?c
Dipolar Excitation
Quadrupolar excitation
quadrupolar rf field in the transversal plane ?c
q/m B
Lorentz force is compressing the ion cloud
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• Charge exchange process

Sideband excitation
Cooling by buffer gas collisions 10-4 mbar Ne
130Xe ions
40Ar ions
78Kr ions
Of interest for the  ion catcher  devices

• Molecule cooling for contaminants free beams

• SeCO, and AlF molecular beams tested
• SnS to be tested

P. Delahaye
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TOF SeCO
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New control system

• New LINUX/JAVA based control system commissioned
  for ISOLDE
• Scanners and wire grids still running under
  windows on dedicated consoles
• W95-gtWXP
• Please check USERS applications for XP
  compatibility
• For introduction and feed-back please contact
  Tim Giles

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New controls
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Technical support at ISOLDE

• Re-organization of technical support for ISOLDE
  in progress
• Experimental area section in ATB group and new OP
  EIC post
• Work package plan for all technical support for
  operation, maintenance and RD in the
  experimental area established
• More at next meeting

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Towards the future

• Tendering in progress for hall extension
• Building start July 2004
• Work on hall partition (with dust barrier) from 1
  January to 15 March 2005
• Class A lab under construction
• Work on partition 15 November to 15 February 2005