ariel’s e-linac and beam transport line vacuum systems vacuum system… · rib production...

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


FOM Seminar - September 2011 6

ARIEL Facility Layout

November 17, 2012

10/17/2012 7

ARIEL Building

FOM Seminar - September 2011

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

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


New Proton Beam Line (BL4N) – 2014- 2018


• 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


• 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)


• 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


• 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


• 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


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


• 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


ariel’s e-linac and beam transport line vacuum systems vacuum system… · rib production...

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