YETS activities at ISOLDE Richard Catherall ENSTIRBS ISOLDE

YETS activities at ISOLDE Richard Catherall EN-STI-RBS ISOLDE Technical Coordinator 75 th ISCC meeting 2 nd February 2016

The LIEBE target (Liquid Eutectic Lead Bismuth loop target for Eurisol) Test for shower feasibility done: • Minimum droplets size is 0. 4 mm diameter (diffusion) Improve exotic Hg beams by up to factor 10! Design finalized • Manufacturing started • Modifications at Front-End to be presented next Thursday – ENTM ALARA • Full target manufacturing and assembly planned for April 2016 Ph. D Melanie Delonca 2

Carbonyl beams of refractory elements Principle: CO (g) Mo Carbonyle compounds 1 H 3 4 Li Be 11 12 2 He 5 6 7 8 9 10 B C N O F Ne 13 14 15 16 17 18 Na Mg Al Si P S V(CO)6 Cr(CO)6 Mo(CO)6 Cl Ar W(CO)6 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Tc 2(CO)10 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Re 2(CO)10 55 56 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 Ru(CO)5 Cs Ba La. . Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 3 U Foils, 25 µm Os(CO)5 105 Mo production yield: ~ 108 ions / u. C Proton beam Neutron converter Co 2(CO)8 Rh 2(CO)8 Ir 4(CO)10 Mo Container, Filled with CO Ph. D Jochen Ballof Ni(CO)4 3

Carbonyl beams of refractory elements Modified VADIS Ion source Calibrated leak Manometer Heating ~ 200 mbar ~ 110 C Mo(CO)6 Classic injection path (hot vadis) Cathode Extended copper cylinder Water cooled target base Ph. D Jochen Ballof 4

Eu scheme development at RILIS with PISA Eu - Integrated Photo. Ionization Spectroscopy Apparatus (PISA) - To be used as reference for in-source laser spectroscopy and ionization scheme development - Make use of RILIS set up during shut down - Enables exploratory scheme development at RILIS, prior to test with dedicated ISOLDE target - First candidate: Europium (Eu) - Scan of 2 different dye lasers and new grating Ti. Sa - Many new autoionizing states discovered - Two promising schemes with dye or Ti. Sa identified 2 nd step dye 585 nm to 918 nm IP 5. 7 e. V 2 nd step Ti. Sa 311. 14 nm Slide by K. Chrysalidis Autoionizing states in Europium -> most efficient scheme? More tests needed

Shutdown work outline ISOLDE Hall Separator areas HT room MEDICIS Target Area Many interventions in different areas nearly all requiring the services of RP Avoid co-activities especially in sensitive areas

MEDICIS Interface En cours 10. Portes et Etagères (méc. ) Yury–Vincent 13. Lisol Magnet: Transport B --> CH et modifications Vincent - Yisel En cours 5. Raccordements et Tests préliminaires robot Medicis En cours Bat. 179: Planning juin 2015 … mars 2016 Jean-Louis 5 a. Adaptation points d’échange robots Isolde selon ECR de Matteo 19. Installation MONTRAC mécanique + câblage et mise en service partielle Matteo 16. Installation blindage chicane Matteo 18. Mise en service ventilation SAS Alexandre En cours 9 a. Porte et supply point Vincent En cours 25. NEW task: HOT CELL étanchéité, ventilation, contrôle, UPS, réfection sol Ana-Paula / Paul 17. Création SAS ventilation 2 portes Matteo En cours 20 a. NEW task: Modification Access Isolde selon ECR de Eva Matteo 20. Système d’accès MEDICIS mise en service Eva Z 6 21. General safety MEDICIS Ana-Paula 22. Radioprotection MEDICIS Mise à jour 5. 1. 2016 - KK, SM S. Marzari Joachim 3. Analyse de Risques et Upgrade réseau secouru et UPS Ana-René

MEDICIS Interface S. Marzari Bat. 179: Planning juin 2015 … mars 2016

MEDICIS Interface in pictures

Target Area • Frontends … ALARA L 3 intervention • • • Annual Frontend maintenance Modification of target coupling table and its control Change of GPS target coupling piston Faraday cage piston exchange Preparation for LIEBE target tests • General maintenance • BTY line checks • Robot programming checks • Ventilation

LIEBE target test preparations • Test on-line (GPS) planned for end of 2016 • Less risk for ISOLDE operation • Preparations need to be done during YETS • To benefit from lower dose rates • Review in view of operation planned for June 2016 • Maybe a second ALARA L 3 meeting required • Work includes • • • FE modifications Cables through HT transfer tubes FE supports and guide for pump trolley Water connections Shelf position modifications Robot programming

Frontend modifications/revision • Change coupling table • Relieve forces on ball-bearings • Introduce an adjustable end-stop for the same reason • Profit to make minor changes for potentiometer and be compatible with LIEBE target

Frontend maintenance/revision • Modification of potentiometer • Inability to confirm that target is correctly clamped due to too much hysteresis in rotational axis. • Micro-switches will also be added for redundancy/verification Potentiomètre linéaire Rotated return

Frontend maintenance/revision • Exchange of GPS piston for new design (already done on HRS) • Inability to clamp target • Confusion with potentiometer feedback has led to unnecessary filling of exhaust gas tanks • New design tested 1000 times off-line

Ventilation • A lot of work has been done on the ventilation systems over the last year. • Acceptance of new and modified ventilation system for Class A labs and MEDICIS • Integration of hot cell into new ventilation system (on-going) • Monitoring and evaluation of fluctuations in tunnel ventilation Cause related to oversized ducting resulting from the separation of the ventilation system of the tunnel from the Class A labs Ducting modified in January 2016. To be tested at start-up.

ISOLDE Hall • Upgrade of vacuum controls TE-VSC • Verification of beam instrumentation • Will be done with beam in cold check out • Installation of Fast Tape Station • Separator areas • Change of vacuum valve HRS section 2 and 3 • Laser window exchange HRS + GPS • HT Room • HT maintenance • Preparation for modulator tests

A new 60 k. V modulator for ISOLDE/HIE ISOLDE A new modulator circuit has been developed with relatively low power components to provide a robust and accurate charging device capable of re-establishing the 60 k. V with improved recovery time. It has been designed especially to sustain the expected increases in beam energy (2 Ge. V) and higher intensity beams for HIE-ISOLDE. Modulator HT pulsing specifications - Recovery times to within +/-1 V with a simulated target of ~1 ms. To be measured with neutron converter target at ISOLDE facility. MD at ISOLDE facility The modulator characteristics have been measured in a simulated environment. To confirm our findings we aim to operate our new set-up installed in the HT room running in pulse operation mode with the ISOLDE target loads installed and with proton beam. MD at ISOLDE facility will give the possibility to evaluate the new modulator. A mock-up can be installed in the present modulator tank by replacing the ASTEC power supply this way we can re-use the high precision ROSS divider. - Maximum voltage overshoot < 0. 2% Recovery time Protons time of arrival New modulator 30 k. V recovery signal measurement (Heinzinger HVPS 65 k. V – 40 m. A) Power supply specifications - HT set-point from 10 k. V to 60 k. V with 1 V resolution Test description at ISOLDE facility - HT stability +/- 1 V (external regulation) The worst case scenario concerning ionization is the neutron converter target with the highest possible proton beam intensity (3. 3 e 13 ppp). - HT warm up delay (drift compensation) < 5 mn Monitored signals - HT recovery time signal acquired and monitored - HT long term stability acquired and monitored - Post-impact loading current acquired and monitored Test in a simulated environment Our mock-up installation in ASTEC tank (ISOLDE HT room) As the target is pre-charged at the moment of the beam impact, there is a risk of flash-over at the Isolde front end. The presence of Medicis target and its faraday cage can have an influence on this risk. This can be evaluated at the same time.

Overall Planning

Micro –scheduling Thursday 11: 00 – 12: 00 26 -1 -022 In Outlook, open calendar: Shut-down ISOLDE

Cold Check Out • The most efficient way of testing machine operation is to run with stable beam • Power convertors, HT, magnet controls, beam diagnostics, collimators … • Our goal is to make stable beam 1 month prior to taking protons • 1 st March • All separator systems should be operational or in test phase • Water cooling, controls, power convertors, BI etc • In parallel, RILIS will investigate laser ionisation schemes on specific stable beams. • NTo. F will be making samples of 7 Be for their first physics run

Safety • Due to an accumulation of varied incidents, ISOLDE is now in the spotlight in terms of safety. • Although a draft memorandum dedicated to safety at ISOLDE is still under discussion, we can expect a few obligatory changes in the way we work.

ISOLDE Consolidation • There is an on-going request for consolidation for ISOLDE over the next 5 -years • Presented initially at the Chamonix Workshop, September 2014 • Submission of BCR requests to the department head… • Following discussions last Friday, the following items have been retained for consolidation Work package Group Frontends x 2 +1 Reserve EN-STI Tape station EN-STI Vacuum TE-VSC Cameras for target area EN-STI Off line 2 EN-STI Beam diagnostics electronic and mechanics BE-BI RILIS laser power supplies EN-STI 60 k. V modulator TE-ABT Magnets (separators and REX triplet spares) TE-MSC

ISOLDE Lines - Survey Results Measurements of November/December 2012 Isolde Lines Survey Results – meeting 15. 01. 2013

RESULTS – vertical plane ~ 10 mm step Zavg = 437. 0172 m Dev: -1. 5 mm to +1. 5 mm Zavg = 437. 0073 m Dev: -1. 8 mm to +1. 1 mm Isolde Lines Survey Results – meeting 15. 01. 2013

RESULTS – vertical plane Isolde Lines Survey Results – meeting 15. 01. 2013

RESULTS – horizontal plane main line CA 0 – CD 0 Line: CA 0 -CB 0 -CC 0 -CD 0 Name CA 0_Q_E CA 0_Q_S CB 0_Q 1_E CB 0_Q 1_S CB 0_Q 2_E CB 0_Q 2_S CC 0_Q 1_E CC 0_Q 1_S CC 0_Q 2_E CC 0_Q 2_S CD 0_Q 1_E CD 0_Q 1_S Bearing [g]: 351. 4005 X [m] Y [m] Distance to line [mm] 1879. 3962 1878. 7661 1877. 3575 1876. 7272 1874. 9036 1874. 2733 1872. 8599 1872. 2301 1871. 3751 1870. 7443 1869. 3341 1868. 3920 2239. 1236 2239. 7807 2241. 2535 2241. 9131 2243. 8206 2244. 4785 2245. 9545 2246. 6140 2247. 5059 2248. 1640 2249. 6383 2250. 6219 -0. 1 -1. 1 -0. 6 0. 1 1. 4 0. 9 0. 2 1. 2 0. 0 -0. 7 -0. 3 -0. 9 Deviation scale 500: 1 Relatively to the scale along the beam Isolde Lines Survey Results – meeting 15. 01. 2013

RESULTS – horizontal plane bearings comparison Line CA 0 -CB 0 -CC 0 -CD 0 LA 1 LA 2 LA 0 -LA 3 LC 0 RA 0 RB 0 RC 0 -RC 2 -RC 6 RC 3 RC 4 Theoretical Bearing [g] 351. 4121 245. 8565 279. 1898 312. 5232 390. 2997 390. 3010 29. 1899 323. 6343 Calculated Bearing [g] 351. 4005 245. 8974 279. 2213 312. 4988 312. 5030 390. 3080 390. 2699 390. 2941 29. 1670 323. 6108 Difference Calc-Theo [cc] -116 409 315 -244 -202 83 -311 -69 -229 -235 10 cc ~ 0. 16 mm/10 m +409 cc +315 cc -244 cc -116 cc +83 cc Theoreticl Bearing Calculated Bearing -202 cc LC 0