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