Benasque The Beta-beam Mats Lindroos on behalf of The beta-beam study group.
Technical report for ISOLDE Mats Lindroos on behalf of the ISOLDE team.
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Transcript of Technical report for ISOLDE Mats Lindroos on behalf of the ISOLDE team.
![Page 1: Technical report for ISOLDE Mats Lindroos on behalf of the ISOLDE team.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697c0011a28abf838cc24c4/html5/thumbnails/1.jpg)
Technical report for ISOLDE
Mats Lindroos on behalf of the ISOLDE team
![Page 2: Technical report for ISOLDE Mats Lindroos on behalf of the ISOLDE team.](https://reader036.fdocuments.net/reader036/viewer/2022062322/5697c0011a28abf838cc24c4/html5/thumbnails/2.jpg)
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
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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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R&D priority list
• ISOLDE upgrade group has established a priority list for ISOLDE R&D– http://isolde-
upgrade.web.cern.ch/isolde-upgrade/
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Priority 1
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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
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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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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
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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
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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
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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
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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
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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->WXP
• 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 R&D 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