Technical Report for the INTC and ISCC Meetings 16th November 2009

Richard Catherall EN-STI-RBS

Outline• Operations throughout 2009

– Targets– REX

• Operation, Linac consolidation– RILIS– Incidents

• Robot failure, operations

• Safety– Safety Audit– New Procedures, Alara, DIMR

• 2009/2010 Shutdown Planning– HRS Front End #3 exchange– Vacuum controls consolidation

• News from support groups• HIE- ISOLDE

– Status

Targets• Target Production

– Production of 23 targets, 12 UC2-C.– VADIS – Versatile Arc Discharge Ion Source.

• Operated successfully during 2009• Adapted to different variants of ion sources/transfer lines.• Generated interest at other institutes

– BeO target with n_converter for 6He production• Successful tests at the beginning of the year

– GdB6 line for laser ionization of Nd– See presentation by T. Stora at ISOLDE Workshop.

• Target drawings updated to Catia– Models used for simulations and developments

REX campaign 2009(1) 72KrMINIBALL Coulex/shape measu. 2.85 MeV/u 9-gap vacuum failure: run cancelled (2) 94,96KrMINIBALL Coulex 2.85 MeV/u Isolde vacuum failure half way through the run (3) 62Mn/FeMINIBALL Coulex 2.86 MeV/u -> Fe isotopes produced by in-trap decay of Mn PSB problems + linac RF (24h stop) (4) 138XeMINIBALL Coulex/g-factor meas. 2.87 MeV/u (5) 29,30NaMINIBALL Coulex 2.85 MeV/u (6) 200PoMINIBALL Coulex/shape measu. 2.85 MeV/u -> Heavy beam 5% low energy eff. (7) 107,109SnMINIBALL Coulex energy 2.85 MeV/u-> long run: 10 days (8) 11BeTransfer reactions at MINIBALL 2.86 MeV/u-> stripping foils + isotopically pure buffer gas Cathode failure during setup (9) 66NiTransfer reactions at MINIBALL 2.9 MeV/u-> long run: 10 days

* A number of failures: one run cancelled several runs hampered by problems

* Despite all problems we managed to deliver beams to (almost) all users

* Some promising results: 200Po, in-trap decay, transfer reaction of 66Ni

Courtesy of D. Voulot & F. Wenander

• REXTRAP control system upgradeNow foreseen for 2010-2011 shutdownAll groups agree; detailed specification discussions ongoing

• PAM - new PicoAmpere Meter for REXTRAP testedIn-house production by BE-BIVariable integration time, noise level few 100 fA, very promisingTo be implemented with the REXTRAP upgrade

• REX separator shielding to WITCH magnetic field Tested beam transport and A/q-scaling with B-field on

transport can work for limited B-field with large steeringA/q-scaling does not work

=> WITCH magnet should not be energized while REX is setting up or delivering radioactive beam

• Mass resolution tests finished + new in-trap decay resultsSee D. Voulot’s talk at the ISOLDE workshop

REX-Low energy

Courtesy of D. Voulot & F. Wenander

REX - Linac consolidation I

• Linac RF cooling and ventilationNew ventilation for the RF room + Modification of RF amplifier

(water cooling with heat exchangers)-> improve temperature stability + cleanliness -> longer RF tube lifetime (25kCHF/piece)

• Linac shieldingConstruction of shielding tunnel around the linac

-> remove lead boxes on cavities-> faster and easier access to equipment-> less X-ray background at Miniball

Courtesy of D. Voulot & F. Wenander

Linac consolidation II• Beam instrumentation controls

Replace old control system (RS485, MS Visual Basic Windows based system) with control server based on VME crate + dedicated VME cards

-> CERN standard (piquet support, easier to maintain)-> modular system (possibility of extension and modifications)

• New tuner mechanics for the 7-gapsImprove reliability and stability-> less RF interruptions-> under construction (maybe installed next year)

Courtesy of D. Voulot & F. Wenander

Polarized beamsBeta-NMR setup from HMI Berlin

Now under installation after REX

Preliminary installed after 2nd beam-line magnet sample chamber scintillators, light guides and PM tubes vacuum system electronics beam-line quadrupole magnet

Tests foreseen for June 2010

Mobile Tilted Foil Setup at 2nd beam line

Stepper motor operational for foil inclination/rotation

New larger foils arrived (40x12 mm2)

Initial test scheduled for week 48Coulex of stable polarized 21NeUse Miniball particle and gamma detectors

Courtesy of D. Voulot & F. Wenander

New Nd:YAG lasers at ISOLDE RILISCopper Vapor Lasers are replaced by Diode Pumped Solid State Nd:YAG Lasers

Laser generates 3 beams at 10 kHz:Main green beam – 532nm, 70-80 W, 8 nsResidual green beam – 532 nm, 12-28 W, 9 nsUV beam - 355 nm, 18-20 W, 11 ns

Main green beam

Residual green beam

UV beam

Two lasers are available: one in use, second as a backup

Courtesy of V. Fedosseev

RILIS operation in 1994-2009

0

500

1000

1500

2000

2500

Hou

rs

1994 1996 1998 2000 2002 2004 2006 2008Year

2143 h - total1994 h - on-line

In 2009 Nd:YAG lasers have been used for ALL 14 RILIS runs

Be, Ga, Ag, Nd, Po, Mn, Mg, Po, Sn, Mg, Mn, Be, Zn, Ni

Laser ON timein 2009:

Courtesy of V. Fedosseev

A new RILIS scheme for manganese - LARIS result

Replacement of the scheme which uses the CVL green beam.

Fortuitous Auto-ionizing transitionat CVL wavelength

Outcome of RIS study of Mn at LARIS:

Many new auto-ionizing states found

Various promising Nd:YAG based schemes tested New scheme applied at RILIS Efficiency > 8 %

AIS search at LARIS

Courtesy of V. Fedosseev

Correct target pick up Target #407 failed pick-up

Robot Incidents HRS• Robot failed to pick up target correctly and became jammed at Front End. This

after failing 2 weeks earlier.• Human intervention required to retrieve situation.• High collective and individual dose for participants.• The failure, due to the robot incorrectly pulling the target to its pre-defined

position was identified and corrected…but at a cost.

GPS – a separate incident

Door #3

Shelf 1

Shelf 2

Shelf 3

Left 1 Right 2

Pre-programmed pick and place cyclePre-defined locationsE.g. Take target from Front End to door position 322Incident occurred because 321 coordinates were saved as position 322.Human error? Overwritten values…Save as!!Program manipulation error, software?Action: •Do not use this shelf position this year.•Test other shelf positions without target before use.•Re-program robot correctly during next shutdown.

Operation - Incidents• GPS.FC490

– Bent due to collision with deflector plate. Interlocks overridden?• Beam losses in BTY line/protons on converter

– Caused a reduction in p-beam intensity during Ag run in May/June.• Vacuum control problems including RFQ vacuum

– Initiated by CERN-wide power cuts• Water in the hall

– Condensation in the air conditioning equipment situated above the control room.• Excessive sparking at FE’s

– Dehumidifier fuse – Including dirty extraction electrode tip.

• HRS.FC20 isolated because of impossibility to move it.• Failure to remove target #415 from HRS FE#3 last week.• Nmr resets on HRS magnets• Failure of plc’s for target and ion source power supplies

– Including 24V power supply failures

• Linac 2 vacuum leak• Repair of septa magnet in PS

Operations

• Despite all the problems, an overall successful year for physic’s at ISOLDE.

• Thanks to the contributions of all the support groups involved

• More support from other groups:– BE-CO, TE-MSC, EN-ICE, EN-MME, PH-ADO……and all those boarding the HIE-ISOLDE project.

Safety

• Two issues that have triggered a change in the approach to safety at ISOLDE.– The Internal Safety Audit and their

recommendations– The failure of the HRS Robot to correctly retrieve a

used target x 2.

Internal Safety Audit• An exercise recommended by the management for all installations at CERN

– ISOLDE being the first after the LHC• A series of meetings between the appointed auditors and the various

groups associated with the operation of ISOLDE• A report published with recommendations for different departments

– The inter-departmental sharing of tasks between the DSOs of EN and BE with respect to ISOLDE remains to be formalized at the level of the Sector.

– …shall finalise the inventory of hazards and document the control measures (procedures and systems)…

– …that all interventions under their responsibility are carried out following the optimization principles stipulated in the Safety Code F.

• ALARA: As Low As Reasonably Achievable and the adoption of the ALARA Committee.

Robot Incidents• Three reports produced.• Presented at FOM (Facilities Operation Meeting), IEFC (Injectors

and Experimental Facilities Committee).• Used as an example to endorse the adoption of the DIMR: Dossier

D’Intervention en Milieu Radioactif– Relatively new procedure to the PS complex still under approval.– Combined with an ALARA committee– Different procedures according to radiation

levels/contamination/expected absorbed dose of participants– Most interventions at ISOLDE are Level 3 (highest).– Timely.

• No more “quick” interventions without completing the DIMR.• Knock on effects for operation.

Shutdown Planning 2009/2010

• 2 major interventions projected for the shutdown 2009/2010.• Replacement of the HRS FE#3 by FE#6

– Including “Boris tube” insulators and cables– Motivation: FE#3 has gone beyond its expected lifetime in terms of

absorbed radiation dose. Installation in controlled conditions.– Failure of HRS Frontend to decouple actual target as from last

Wednesday.• Renovation of vacuum system controls

– All vacuum sections of ISOLDE excluding REX– Motivation: frequent vacuum control breakdowns, aging and obsolete

equipment. Benefit from support from the Vacuum Group.

20ISOLDE WORKSHOP

The New ISOLDE Frontends

Stefano Marzari & EN-STI-RBS team

Frontends (1, 2), 3, 4 Frontends (5), 6, 7

Front End #6 ImprovementsSee presentations by S. Marzari and T. Giles in ISOLDE workshop

Smaller volume

Improved optics

Linear potentiometers

Ceramic insulator

Improved alignment system

Detachable front part

Compressed air motors

New controls

Boris Tube InsulatorsThe removal of the Front end provides a unique opportunity to replace the repaired insulator (2007) .Implies a complete exchange of the cabling through the BT

Salle HT

Faraday cage HRS

Boris

tube

Séparateur HRS

Planning of FE exchange• Phase 1 - Removal of FE#3

• 13th – 15th January

• Phase 2 - Removal of Boris tube cables and insulator exchange• 18th – 22nd January

• Phase 3 - Cabling of BT and ground elements• 25th January – 12th February

• Phase 4 - Installation of FE#6, alignment• 15th – 19th February

• Phase 5 - Coupling, vacuum and electrical• 22nd – 24th February

• Phase 6 - Tests, mechanical, vacuum, power• 3rd March ->

• Key dates– Cold check out 5th April– Off-line run – 19th April– Protons to ISOLDE – 26th April

• Warning: Planning subject to change according to progress on both FE installation and vacuum controls upgrade progress!!

Vacuum• Complete renewal of ISOLDE

vacuum controls• Collaboration between TE-VSC

and EN-ICE

• New plc’s, controllers and crates• New vacuum controls - PVSS• Major cabling overhaul• Work already started on unused

beam-lines• Once started…no looking back!

PID for ISOLDECourtesy of G. Vandoni

LA1

Courtesy of S. Blanchard

• Main Controlled Equipments200 Valves120 Gauges50 Pumps110 Crates

• New Cables (Installation EN/EL)Tunnel HRS/GPS : 70 CablesHall : 155 CablesCR&“Primaire RA” : 60 Cables

Vacuum

News from Support Groups• BE-OP

– Employment of D. Voulot as from 1st January 2010.• PH-SME

– Employment of technician J. Thiboud (2 years) for WITCH and REX• SC-RP

– Supplementary RP technician for shutdown period.• EN-STI

– Successful negotiation of 2 Fellows in collaboration with ESS, Lund. Target area upgrade and liquid metal loop project.

– Approval of 3.5MCHF for target area upgrade project starting 2010.– Opening of post for a Safety Engineer within EN-STI-RBS– Technical student starting today (6 months) for safety file of ISOLDE.– Opening of post for Laser Physicist in EN-STI-LP– Increase in general consolidation to 250kCHF for 2010.

Courtesy of Y. Kadi and M. Pasini

HIE-ISOLDE Schedule

Important milestones for Energy Upgrade:•Start project Jan 1st 2010•Cryogenics building ready Dec 2011•Installation infrastructures completed Dec 2012•Cryogenics installed and commissioned Jun 2013•High energy beam line (5.5 MeV/u) installed by March 2013•Full Linac (10 MeV/u) installed by Jan 2014•Commissioning completed by June 2014 inline with L4 and PSB commissioning (Oct. 2013 to July 2014)

Current Cost

The current cost of HIE-ISOLDE 1 is 36 MCHF materials and 124 FTE (71 staff + 53 Fellows/Phd)

This includes the beam quality improvement and part of the linac design study & prototyping costs (5 MCHF including FTE) that have already been spent, and necessary consolidation

costs. Of the assured external funding (see below) 5 MCHF remains unspent

Materials MCHF staff Fellows/students

Beam quality improvements

4

Prototyping, Linac up to 5.5 MeV/u

8 21 26

Infrastructure, management and safety

14 30 7

Linac up to 10 MeV/u

8 6 3

Design study for intensity upgrade

2 14 17

R&D activity on HIE-LINAC

Y. Kadi HIE-ISOLDE Proposal, IEFC, August 21, 2009

• RF – Beam dynamics studies• High b cavity prototype

– Copper substrate manufacturing– Chemical etching– Nb sputtering

• RF sub-system prototypes– Tuner– Power coupler

• SC solenoid prototype• Cryomodule designIn parallel preparation of a test stand for QWR at CERN

Cage de faraday

Zone au rez de chaussé libre

High –beta cavity final welding and cleaning

THPPO010M. Pasini SRF09 Berlin, 20-25.09 2009

SC solenoid prototype (Nb3-Sn technology)

Magnetic length 0.16 m

∫ B2 dz >16.2 T2m

Max mechanical length <0.4 m

Operating temperature 4.5 K

Inner Diameter 30 mm

30 346672

200230

5

Nb3-Sn 160 Turns 16 layers

216

270

Mechanical drawings for the model are completed

M. Pasini SRF09 Berlin, 20-25.09 2009

Cryomodule design

Features: Single vacuum cryostat Side loading of the cold masses Independent alignment of the cavities w.r.t. solenoid Heat shield cooled by He cold gas

M. Pasini SRF09 Berlin, 20-25.09 2009

Summary (1/2)

• Cavity prototype completed. Tests to be done @ TRIUMF before the end of the year

• Cryomodule concept design completed, will start detailed design as soon as manpower is available

• Preparation of test bench at CERN of QWR resonators (new test cryostat is planned to be ready by Feb/Mar 2010)

• Complete Cavity configuration test is planned by the end of 2010.

M. Pasini SRF09 Berlin, 20-25.09 2009

HIE ISOLDE R&D activity is in good health and ongoing:

Summary (2/2)

• Fellow for RF Cavity Tests => launch fabrication of 5 series cavities (50% paid by SPL)

• Fellow for Cryomodule detailed design due by mid-2010

• Fellow for radiation protection => validate layout• Prepare Resource-loaded Plan for CERN Management

=> release resources as early as possible (mid-2010/2011)

• If construction starts by mid-2010, then installation and commissioning of the first 2 cryo-modules for 2013

M. Pasini SRF09 Berlin, 20-25.09 2009

Research Training Themes Addressed by this ITN Proposal

Y. Kadi HIE-ISOLDE Proposal, IEFC, August 21, 2009

HIE-ISOLDE Subsystem Research Training Theme No. ESR

No. ER

I. Linac

1. Super-conducting Cavity RF (LLRF system) 1 -2. Super-conducting Cavity manufacturing 1 -3. Beam Instrumentation 1 14. Transfer Line magnets 1 -5. Linac Integration 1 -6. Linac Alignment 1 -7. Single Cavity and complete Cryomodule tests 1 -

8. Linac commissioning and control applications development 1 -

II. Design Study for intensity upgrade

9. Target Material Development 1 -10. Target design 2 -11. High voltage and high current systems 1 -12. Extraction optics and front-end design 1 -13. Cooling and ventilation 1 -14. Vacuum systems 1 -15. Low-Level controls 1 -16. Off-line separator and HRS magnet 1 -17. RFQ cooler and Pre-separator 1 -18. Beam lines (REX-EBIS studies) 1 -

III. Safety 19. Radiation protection systems for the Linac. - 120. Radiation protection studies for the Intensity Upgrade 1 -

Thank you for your attention