ARIEL s E-linac and beam transport line vacuum systems

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Canada s National Laboratory for Particle and Nuclear Physics

nucléaire et en physique des particules ARIEL s E-linac and beam

Koveshnikov TRIUMF, 3 rd UK Vacuum Symposium November 17-18, 2012

universities via a contribution through the National Resear ch

canadiennes, géré en co-entreprise à partir d une contribution

1 Canada s National Laboratory for Particle and Nuclear Physics Laboratoire national canadien pour la recherche en physique nucléaire et en physique des particules ARIEL s E-linac and beam transport line vacuum systems D. Yosifov, A. Koveshnikov TRIUMF, Canada s National Laboratory for Particle and Nuclear Physics 3 rd UK Vacuum Symposium November 17-18, 2012 Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Resear ch Council Canada Propriété d un consortium d universités canadiennes, géré en co-entreprise à partir d une contribution administrée par le Conseil national de recherches Canada

2 Outline Facility overview ARIEL vacuum systems ARIEL project highlights Summary November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 2

3 ARIEL ARIEL will be TRIUMF's flagship Rare Isotope Beam facility for the production of isotopes for physics and medicine. ARIEL uses proton-induced spallation and electron-driven photo-fission of ISOL targets for the production of short-lived, rare isotopes that are delivered to multiple experiments simultaneously at the ISAC facility. November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 3

4 Layout 500 MeV Cyclotron: 5 material science ( SR) facilities Cyclotrons owned by Nordion ISOL facility for RIB experiments 2 isotope production facilities Proton therapy facility Proton irradiation facility Neutron irradiation facility ARIEL AT TRIUMF November 17, 2012 Dimo Yosifov New H- source 3rd Vacuum Symposium UK 4

ARIEL Project: Motivation New Accelerators New Front End ISAC I ISAC II 10-Year Vision: substantially expand RIB program with: three simultaneous beams increased number of hours for beam delivery per

5 ARIEL Project: Motivation New Accelerators New Front End ISAC I ISAC II 10-Year Vision: substantially expand RIB program with: three simultaneous beams increased number of hours for beam delivery per year new beam species increased beam development capabilities New Mass Separators New Targets e-linac November 17, 2012 Cyclotron Dimo Yosifov ARIEL I ARIEL II Existing 3rd Vacuum Symposium UK Implementation: Additional electron linac driver for photo-fission New target stations and front end New proton beam-line Staged installation

6 ARIEL Facility Layout November 17, 2012 FOM Seminar - September

7 ARIEL Building 10/17/2012 FOM Seminar - September

8 RIB production, hours/year RIB Production Potential Target A ISAC-I target Target B The e-linac 2014, the new proton line 2017: double RIB hours PHASE I Target C high power electrons: triple RIB hours by 2018 PHASE II e - C p + B p + A e - B Year November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 8

ARIEL Time line Funded now - ARIEL I (to be completed by 2015): Electron beam at 25 MeV, 100 kw from SRF linac Civil construction to encompass objectives of both ARIEL Phases I & II Excavation

9 ARIEL Time line Funded now - ARIEL I (to be completed by 2015): Electron beam at 25 MeV, 100 kw from SRF linac Civil construction to encompass objectives of both ARIEL Phases I & II Excavation complete, construction begins Exploring funding to complete in this 5YP: Electron Target Station ARIEL Front-end for ISAC Next five-year plan ARIEL II ( ): Electron beam at 50 MeV, 500 kw Proton beam at >480 MeV, 100 μa from the H- cyclotron using new proton beamline Proton target station 2 nd ARIEL Front-end for ISAC November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 9

10 New Proton Beam Line (BL4N) Required beam: A Energy: MeV Transport capacity: 200 A Beam dump capacity: 200 A Intensity instabilities: <1% Achromatic design & collimation: low loss 500 Hz beam rastering on target November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 10

11 e-linac Courtesy of JLAB Electron driver for photo-fission: independent development Elliptical SC cavities at 1.3 GHz Operation mode CW Limited gradient at 10 MV/m Final energy 50 MeV Intensity 10 ma ½ MW beam power 100 kv gun is being tested 50kW 50kW 50kW 25MeV 50kW 50kW 50MeV Gun 10MeV 50kW Injector 50kW 50kW 2014 Driver 50kW 50kW 2017 November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 11

Collaboration with Variable Energy Cyclotron Center Same goal: electron linac for RIB VECC (Kolkata, India) Original scope (2008): build and test with beam two Injector Cryo-Modules

12 Collaboration with Variable Energy Cyclotron Center Same goal: electron linac for RIB VECC (Kolkata, India) Original scope (2008): build and test with beam two Injector Cryo-Modules (ICM) at 10MeV/50kW Share resources Supported early start of e-linac design Collaboration is a success and expands into new areas! November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 12

13 E-Linac and VECC E-Linac requires one nine-cell in the injector section and two ninecell cavities in the accelerator section by MeV/3mA Injector Cryo-module (ICM) to be used as a working prototype for the two cavity Accelerator Cryo-module (ACM) Two ICM s will be built and tested with beam - one for TRIUMF and one for VECC Test area in ISAC-II identified - e-hall cryogenics not ready until late kW 50kW 50kW 25MeV 50kW 50kW 50MeV Gun 10MeV 50kW Injector kW kW Driver 50kW kW

tests on-going 300kV gun in detail design LEBT in assembly and commissioning Series of beam tests are

14 VECC/TRIUMF Test Station ISAC-II Vault 2K pumps Power coupler test station Equipment Racks Cryoline Existing lab space in ISAC-II used for a beam test of the ICM with a 30kW rf source E-Gun 100kV gun tests on-going 300kV gun in detail design LEBT in assembly and commissioning Series of beam tests are planned Test 1 now complete; test 2 beam tests in progress ICM detail design and fabrication in progress

15 Ariel - VECC Test Layout E-Gun LEBT ICM MEBT Buncher Diagnostic Box Injector Cryomodule 30kW beam dump E-Gun Solenoids 3/10/2012 ERL Workshop - KEK/TRIUMF - Laxdal 15

16 The vacuum system of the E-linac has to provide an environment with reduced pressure for electron beam acceleration. To achieve this goal, the vacuum system has to comply with ultra high vacuum manufacturing and assembly techniques. Careful choice of materials and purchased vacuum components will assure that the requirement is met. Vacuum levels by subsections: -1.3E-9 mbar EGUN, ELBT, EMBT, EINJ, EACA. -1.3E-8 mbar ELBD, EMBD, EABT, EABD, EHAT. -1.3E-7 mbar EHDT, EHD, EHBT. VACUUM SPECIFICATION SEBT beam transport line in the ISAC-II accelerator vault.

17 E-linac vacuum system Turbo pumps will support initial pump down & bake out. Turbo pumps will support cryo-modules isolating vacuum. Ion pumps will hold the vacuum during beam delivery All materials are of low out-gassing rates, will undergo special cleaning and handling procedures Seals are CF knife edge standard: High bake-out temperature UHV pressure The isolation valves are All-metal-RF screened type 17 pcs. November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 17

18 E-LINAC VACUUM SYSTEM SUB-SECTIONS E-GUN ELBT EINJ

19 E-LINAC DIAGNOSTICS BOX WITH DEVICES INSTALLED

20 Injector Cryomodule

21 Top Loading Box Cryomodule Heat exchanger 4K separator tuner strongback 2K separator cavity Power coupler Houses one nine-cell 1.3GHz cavity Two 50kW power coupler Features 4K/2K heat exchanger with JT valve on board expand LHe from 1.4bar to 30mbar Scissor tuner with warm motor Two layers of mu metal warm and cold LN2 thermal shield WPM based alignment Stainless steel tank with hatches for access

The turbo is air cooled. Its controller is installed on the turbo pumping cart. 2.

To deal with such leaks, the chosen turbo pump, which is going to support the isolation vacuum of the cryo-modules, is Leybold Turbovac 361 with mechanical rotor suspension.

The turbo-pump controller is rack mounted and located out of the radiation fields of the e-linac Hall.

22 PUMPS Turbo pumps 1. Turbo pumps for the Turbo pumping carts Agilent V301 Navigator pumps with 6 conflate flange will be used for the initial evacuation and during the bake-outs of the sections of the e- linac. The turbo is air cooled. Its controller is installed on the turbo pumping cart. 2. Turbo pumps installed on the cryo-modules - During operation of the cryo-module, a leak coming into the isolation vacuum from leaky Helium connections is anticipated. To deal with such leaks, the chosen turbo pump, which is going to support the isolation vacuum of the cryo-modules, is Leybold Turbovac 361 with mechanical rotor suspension. It was chosen for its ability to pump at high backing and intake pressures. It is air cooled, but it is possible to be water cooled as well. The turbo-pump controller is rack mounted and located out of the radiation fields of the e-linac Hall. TV-301 Robust rotor design Operation in any orientation Pumping speed: N L/s H L/s Ultimate pressure - <5x10-9 Torr Cooling air Speed RPM BACKING/ROUGHING PUMPS 1. Scroll pumps Triscroll 300 pump will be employed with the turbo pumping carts. This Varian 300 Triscroll dry scroll vacuum pump is designed for high reliability with a 15 m3/hr (8.8 cfm) pumping speed and an ultimate pressure of 1E-3 mbar (1x10-2 Torr). The Triscroll pumps produces oil-free vacuum with the unique patented TriScroll technology [AGILENT]. For preventing the dust particles generated by the Teflon seals migrating toward the backing line and turbo pump a metal wool forline trap with Copper mesh is installed on the pumping port of the pump. 2. ACP pumps The cryo-modules isolating vacuum uses ACP 28 pumps to continuously back up the turbo pumps. ACP 28 series is designed for oil free, particle free, rough vacuum applications that require vacuum levels ranging from atmospheric pressure to mbar. It has pumping speed of 27 m3 /hr (16 cfm). The ACP 28 dry pump employs "Multi-Roots" technology that consists of five Roots stages in series. The rotors make no contact with each other or the stator. This non-contact pumping-cell design means that there are no wearing parts in the path of the pumped gases and, therefore, no particles to back-stream into a vacuum system. The rotor-stator clearance has a low conductance value that enables a low ultimate pressure without rotor-to-stator contact. The two shafts that support the rotor lobes are mounted on ball bearings at both ends. These bearings are sealed from the pumping cell by a combination of lip seals and centrifugal disks. The design includes a canned motor that provides static leak tightness between the pumping cell and the outside of the pump. Because of its frictionless design, the pump runs with very long service intervals of 22,000 hr. [PFEIFFER ADIXEN] Filter

ION PUMPS The ion pumps used on the e-linac are: Gamma 200L model for all diagnostic boxes Gamma 40L model for the RF

Ion pumps are used for their capability to reach the lowest possible vacuum for an economical cost.

operational cost Bake-able Low maintenance Pressure indication Permanent gas capture Radiation field tolerant Long

23 ION PUMPS The ion pumps used on the e-linac are: Gamma 200L model for all diagnostic boxes Gamma 40L model for the RF couplers at the cryo-modules And Gamma 150L pumps on the HEBT. Ion pumps are used for their capability to reach the lowest possible vacuum for an economical cost. In addition, the ion pumps have some technical advantages over other UHV pumping technologies: Vibration free operation Low operational cost Bake-able Low maintenance Pressure indication Permanent gas capture Radiation field tolerant Long operational life Non-contaminating technology The ion pump controllers are multi-channel and single channel type and are installed in a 19 electrical rack, located out of the electron hall and away from damaging radiation fields.

gauge with a broad range of operating pressure capabilities. It is the only gauges to use for measuring pressures below 2 10-10 torr.

24 ARIEL VACUUM GAUGES GAUGES FOR THE RANGE 1mTorr 2.0E-10Torr GAUGES FOR THE RANGE 1mTorr 760 Torr ION GAUGE Convectron gauges Model UHV-24 Nude Bayard-Alpert Type Ionization Gauge Tube The UHV-24 is rugged, open gauge with a broad range of operating pressure capabilities. It is the only gauges to use for measuring pressures below torr. The gauge is available with either long-life thorium-coated iridium filaments or tungsten filaments, both easily replaceable in the field. Maximum bake-out temperature: 450 C Fast response - time In milliseconds High accuracy and repeatability Measurement from atmosphere to 10-4 Torr (10-2 Pascal).

FAST CLOSING VALVE SYSTEM VAT Fast Closing system 77, employed at EHBT and EHBD beam line protects the cryo-modules from damage from a sudden pressure inrush caused by broken window or a failed seal.

25 FAST CLOSING VALVE SYSTEM VAT Fast Closing system 77, employed at EHBT and EHBD beam line protects the cryo-modules from damage from a sudden pressure inrush caused by broken window or a failed seal. Description: The VAT FCS77 consists of three main components connected via cables: Fast closing VALVE with pneumatic actuator. The valve is VAT series 75.2 with 2-3/4 CF flanges. Its total operating time (time from sensing the pressure increase to leak tight closure of valve) is less then 10 ms. It s molecular flow conductance is 160 L/s and the maximum differential-pressure (in closing direction) during opening is 30 mbar. For its operation this valve needs service of-compressed air at PSI. High vacuum (HV) sensor Cold cathode gauge. Its trigger pressure is 10-8 to 10-3 mbar (adjustable) with response time 2 ms (air inrush 1 bar). Controller it contains the modules for the HV sensor and the VALVE module. It permits local and remote operation of the Valve.

EPICS PLC based - Experimental Physics Control System Allows the following activities: Remote operating of vacuum pumps, gauges and valves Active record and archiving of

26 EPICS PLC based - Experimental Physics Control System Allows the following activities: Remote operating of vacuum pumps, gauges and valves Active record and archiving of data collected by the vacuum gauges Via interlocks from the gauges, the control system provides active safety protection for the people and the equipment It is upgradeable

27 CRYOMODULE VACUUM SUBSECTION DIAGRAM STANDARD INTERLOCKS SUMMARY

28 E-linac Cryogenic System E-linac cryogenic system will support 1.3 GHz superconducting linac operation at 2K Air-Liquid cryoplant of 800W will provide LHe at 4K 2K is achieved by sub-atmospheric pumping (30 mtorr) Main challenge is dealing with potential impurities due to leaks into S/A part of the system and the solution is: Hermetically sealed S/A pumps with canned motors. Online purity multipoint monitoring. Full S/A He gas flow (up to 15 g/s) rated purifier. Enhanced gas management and oil removal systems of the cryo-plant November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 28

29 Cryogenic system schematic November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 29

Top Loading Box Cryo-module - Cryogenic insert test Heat exchanger 4K separator tuner strongback 2K separator cavity Power coupler Houses one nine-cell 1.

30 Top Loading Box Cryo-module - Cryogenic insert test Heat exchanger 4K separator tuner strongback 2K separator cavity Power coupler Houses one nine-cell 1.3GHz cavity Two 50kW power coupler Features 4K/2K heat exchanger with JT valve on board expand LHe from 1.4bar to 30mbar Scissor tuner with warm motor Two layers of mu metal warm and cold LN2 thermal shield CESIC HOM damping material in warm/cold beampipe transition WPM based alignment Stainless steel ribbed tank with hatches for access

assembled and the cold test will establish: Static thermal loads

31 Cryogenic-insert design Each cryo-insert will be tested in a test cryostat prior to installation in the cryomodule Cryo-insert is assembled and the cold test will establish: Static thermal loads Cool-down protocol Efficiency of 2K production (estimate 80% liquid) Others.

32 4K/2K Test Unit Heat exchanger 4K phase separator JT Valve Cooldown Valve Burst disk pipe 2K phase separator Thermal intercept loads

Cavity center is indexed to WPM bracket Completed top

adjusted vertically and horizontally to achieve

target After cool-down the support towers are

WPM and optical targets on-line Tank feature is used

33 Cavity center is indexed to WPM bracket Completed top assembly is lowered into tank and support towers are adjusted vertically and horizontally to achieve alignment with the WPM ports and optical targets WPM target After cool-down the support towers are readjusted to account for thermal shrinkage to bring WPM and optical targets on-line Tank feature is used to align tank to beamline Alignment Wire Position Monitor Optical target

34 ICM Status Fabrication underway Cavity good progress at PAVAC 4K/2K cryogenic insert assembled being tested Cold mass support (strong-back, struts) Vacuum tank and lid Detail design complete cold mu-metal scissor tuner LN2 shield

35 Summary New electron linac driver for RIB s is funded and being developed ARIEL facility. The vacuum systems for ARIEL are undergoing design and testing. When completed will cost about $1,000,000 in purchased components and about $1,500,000 in custom build components and salaries (over 5 year period). November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 35

36 Canada s National Laboratory for Particle and Nuclear Physics Laboratoire national canadien pour la recherche en physique nucléaire et en physique des particules Thank you! Merci! 4004 Wesbrook Mall Vancouver BC Canada V6T 2A3 Tel Fax November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 36

Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada

CANADA S NATIONAL LABORATORY FOR PARTICLE AND NUCLEAR PHYSICS Owned and operated as a joint venture by a consortium of Canadian universities via a contribution through the National Research Council Canada