ariel’s e-linac and beam transport line vacuum systems vacuum system… · rib production...
TRANSCRIPT
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 Consei l national de recherches Canada
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
3rd UK Vacuum Symposium
November 17-18, 2012
Outline
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 2
• Facility overview
• ARIEL vacuum systems
• ARIEL project highlights
• Summary
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.
Dimo Yosifov 3rd Vacuum Symposium UK November 17, 2012
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK
4
Layout
New H- source
500 MeV Cyclotron:
• 5 material science (SR) facilities
• ISOL facility for RIB experiments
• 2 isotope production facilities
• Proton therapy facility
• Proton irradiation facility
• Neutron irradiation facility
Cyclotrons
owned by
Nordion
ARIEL AT TRIUMF
Cyclotron
ISAC II
ISAC I
New
Targets
New Mass
Separators
New
Front End
New
Accelerators
e-linac
ARIEL I
ARIEL II
Existing
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
Implementation:
Additional
electron linac driver for
photo-fission
New target stations and
front end
New proton beam-line
Staged installation 2012-
2020
5
ARIEL Project: Motivation
Dimo Yosifov 3rd Vacuum Symposium UK November 17, 2012
FOM Seminar - September 2011 6
ARIEL Facility Layout
November 17, 2012
10/17/2012 7
ARIEL Building
FOM Seminar - September 2011
RIB Production Potential
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 8
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
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Year
RIB
pro
du
cti
on
, h
ou
rs/y
ea
r
p+ A
e- B
p+ B
e- C
ARIEL Time line
9
• 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 (2015-2020):
– 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
– 2nd ARIEL Front-end for ISAC
Dimo Yosifov 3rd Vacuum Symposium UK November 17, 2012
New Proton Beam Line (BL4N) – 2014- 2018
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 10
• Required beam: 10-100 A
• Energy: 450-500 MeV
• Transport capacity: 200 A
• Beam dump capacity: 200 A
• Intensity instabilities: <1%
• Achromatic design & collimation: low loss
• 500 Hz beam rastering on target
e-LINAC
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 11
• 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
Courtesy of JLAB
50kW
50kW
50kW
10MeV Gun
Injector Driver
25MeV
2014 50kW
50kW 50kW 50kW 50kW
50kW 50kW
2017
50MeV
Collaboration with Variable Energy Cyclotron Center
VECC (Kolkata, India)
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 12
• Same goal: electron linac for RIB
• 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!
E-Linac and VECC
• E-Linac requires one nine-cell in the injector section and two nine-
cell cavities in the accelerator section by 2014 – 30MeV/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
2013
10MeV
Gun
Injector-2012 Driver
25MeV
50kW 50kW
2014
50kW 50kW 50kW
50kW
50kW 50kW
50kW 50kW
2017
50MeV
VECC/TRIUMF Test Station
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
2K
pumps
Power coupler
test station
Equipment
Racks
ISAC-II Vault
Ariel - VECC Test Layout
Buncher
Solenoids
Injector
Cryomodule
Diagnostic
Box
E-Gun LEBT ICM MEBT
E-Gun
3/10/2012 15 ERL Workshop - KEK/TRIUMF - Laxdal
30kW
beam
dump
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.
E-linac vacuum system
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 17
• 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.
E-LINAC VACUUM SYSTEM SUB-SECTIONS
E-GUN --------- ELBT -------- EINJ
E-LINAC DIAGNOSTICS BOX WITH DEVICES INSTALLED
Injector Cryomodule
Top Loading Box Cryomodule
4K separator
2K separator
strongback
cavity
tuner
Power
coupler
Heat
exchanger
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
Filter
TV-301
•Robust rotor design
•Operation in any orientation
•Pumping speed:
N2 – 250 L/s
H2 – 200 L/s
•Ultimate pressure - <5x10-9
Torr
•Cooling – air
•Speed – 56000 RPM
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.
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 4 • 10-2 mbar. It has pumping speed of 27 m3 /hr (16
cfm). The ACP 28 dry pump employs "Multi-Roots" technology that consists of
f ive 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]
BACKING/ROUGHING PUMPS
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.
GAUGES FOR THE RANGE 1mTorr – 760 Torr
Convectron gauges
•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).
ARIEL VACUUM GAUGES
• 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 2 × 10-10 torr.
• The gauge is available with either long-life thorium-coated iridium filaments or tungsten
filaments, both easily replaceable in the field.
GAUGES FOR THE RANGE 1mTorr – 2.0E-10Torr
Model UHV-24 Nude Bayard-Alpert Type
Ionization Gauge Tube
ION GAUGE
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 60-70 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.
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
EPICS – PLC based - Experimental Physics Control System
STANDARD INTERLOCKS SUMMARY
CRYOMODULE VACUUM SUBSECTION
DIAGRAM
E-linac Cryogenic System
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 28
• 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
Cryogenic system schematic
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 29
Top Loading Box Cryo-module - Cryogenic insert test
4K separator
2K separator
strongback
cavity
tuner
Power
coupler
Heat
exchanger
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 beam-
pipe transition •WPM based alignment
•Stainless steel ribbed tank
with hatches for access
Cryogenic-insert design
•Each cryo-insert will be tested in a test
cryostat prior to installation in the cryo-
module
•Cryo-insert is assembled and the cold
test will establish:
•Static thermal loads
•Cool-down protocol
•Efficiency of 2K production (estimate 80% liquid)
•Others….
4K/2K Test Unit
4K phase separator
Heat exchanger
JT Valve
Cooldown Valve
Thermal intercept
loads
Burst disk pipe
2K phase separator
Alignment – Wire Position Monitor
•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
•After cool-down the support towers are re-adjusted to account for thermal shrinkage to bring
WPM and optical targets on-line
•Tank feature is used to align tank to beamline
Optical target
WPM target
• 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
ICM Status
Summary
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 35
• 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).
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 604.222.1047 | Fax 604.222.1074 | www.triumf.ca
November 17, 2012 Dimo Yosifov 3rd Vacuum Symposium UK 36