Post on 19-Jan-2016
Technical report for ISOLDE
Mats Lindroos on behalf of the ISOLDE team
Outline
• Shutdown work• R&D priority list from upgrade group• R&D work at ISOLDE• Start-up with new control system• REX integration, R&D and operation• Technical support for ISOLDE
experimental area• Towards the future
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
R&D priority list
• ISOLDE upgrade group has established a priority list for ISOLDE R&D– http://isolde-
upgrade.web.cern.ch/isolde-upgrade/
Priority 1
ATB-IF R&D• 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
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
1. Laser Beam Control
QP2
OPTICAL PATH:18 m to GPS23 m to HRS
M1
Pr1
Pr2
Pr3
M5
M2
Laser Cabin
Pr4
SC
QP1
DG
CCD2CCD1
M4
QP4
Power meter
Pr5Mass separator
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
Shutdown 2003-2004: RILIS Development
2. New ionization schemes
a. DysprosiumStep 1 – = 606 - 677 nm – scanned
Step 2 – 2= 606 - 677 nm – scanned
Step 3 – 3=510.6 & 578.21 nm (CVL) - fixed
b. YttriumStep 1 – = 407 - 414 nm (2) – scanned
Step 2 – 2= 565 - 677 nm – scanned
Step 3 – 3= 510.55 nm (CVL) - fixed
RILIS efficiency = ~ 20%
RILIS efficiency = 80 x surface ion source efficiency
Optimal ionization schemes
510.6 nm
414.3 nm
662.4 nm
Ei=6.22 eV
625.9 nm
607.5 nm
Ei=5.94 eV
Dy
Y
510.6 nm578.2 nm
Shutdown 2003-2004: RILIS Development
REX-ISOLDE• All REX posts allocated• Work package plan for Operation,
maintenance and R&D 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– R&D on molecular beams, good results
for SeCO and AlF R&D 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
Beam preparation with REX-TRAP
Dipolar ExcitationQuadrupolar excitation
Rotating Wall cooling(Investigated method)
BBB
Cooling method tests
Lorentz force is compressing the ion cloud
Sideband cooling (actual method)
buffer gas buffer gas + c
quadrupolar rf field in the transversal plane c = q/m B
E
Accumulation Cooling Ejection
Cooling by buffer gas collisions10-4 mbar Ne P. Delahaye
Charge exchange process
40Ar+ ions
Sideband excitation
78Kr+ ions 130Xe+ ions
ms142 s7.2ms115Of interest for the « ion catcher » devices
Cooling by buffer gas collisions10-4 mbar Ne
Molecule cooling for contaminants free beams SeCO+, and AlF+ molecular beams tested SnS+ to be tested
P. Delahaye
TOF SeCO
New control system
• New LINUX/JAVA based control system commissioned for ISOLDE– Scanners and wire grids still running under
windows on dedicated consoles• W95->WXP
• Please check USERS applications for XP compatibility
• For “introduction” and feed-back please contact Tim Giles
New controls
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 R&D in the experimental area established
– More at next meeting…
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