Competitive Dialogue - Uppsala University...• Development power station for spoke cavities –...

transcript

Competitive Dialogue Sub-Atmospheric Pump Set

Call for Tender

Rocío Santiago Kern

January 2014

1st Part

FREIA Project

and the

Request for Tender

Rocío Santiago Kern 2 Competitive Dialogue: Sub-Atmsopheric Pump Set

Accelerator Physics at UU

• Concentrating on RF and instrumentation …

– Cyclotron (since 1948)

– CELSIUS ring (1984 – 2006)

– CTF3 / CLIC

• Two-beam Test Stand & RF breakdown issues

• FP6-EuroTeV, FP7-EuCARD

• NorduCLIC

– FEL

• FLASH Optical Replica Synthesizer,

• XFEL Laser Heater

• Stockholm-Uppsala FEL Centrum

– ESS

• RF systems

– FP7-TIARA

The European Spallation Source (ESS)

• Lund, Sweden, next to MAX-IV

– 17 member states

• 5 MW pulsed neutron source

– 14 Hz rep. rate, 4% duty factor

– >95% reliability for user time

• Cost estimates (2008 prices)

– 1,5 G€ / 10 years

– 50% by Sweden, Denmark, Norway

• Time frame:

– 2019 first neutrons

– 2019 – 2025 consolidation and operation

– 2025 – 2040 operation

• High intensity allows studies of

– complex materials, weak signals, time dependent phenomena

UU Resposibility for ESS Accelerator

• Contribution to the technical design & construction effort

– design concept spoke accelerating cavity power source

– design concept radio-frequency (RF) power distribution

– survey test stand infrastructure and requirements

– study of upgrade scenarios RF systems for ESS power upgrade

• Development power station for spoke cavities

– soak test with water cooled load, then accelerating cavity, incl. controls

– collaboration with industry to develop vacuum tube and solid-state based prototypes

• System test, power station with

spoke cavity and cryostat-module

– fully dressed prototype cavity (in test cryostat)

– complete prototype module (2 spoke cavities)

• Acceptance test cryostat-modules

(proposal submitted)

– for all final modules before installation

What is FREIA?

• Facility for Research Instrumentation and Accelerator Development

– General Infrastructure

• LHe and LN2 production and distribution,

• Small workshop, control room,

• Concrete bunkers.

– RF test stands

• 352 MHz RF source for ESS spoke cavities,

• Horizontal test cryostat (vertical in future).

– Neutron generator

• Neutron tomography, detector tests,

• Student exercises and projects.

ESS pre-series #1

• 352 MHz, 400 kW pulsed

– FREIA 2pc

– ESS linac 28pc

• FREIA design based on TH595

– tender >350 kW (2012 design)

– allowed alternative solutions

– 12 offers: tetrode, IOT, solid-state

– TH595 solution most competitive

Solid-state R&D station

• 352 MHz, 400 kW pulsed

– FREIA 1pc

• Commercial design

– 1 kW transistors

– 8 kW modules

– coaxial combiner

Rocío Santiago Kern Competitive Dialogue: Sub-Atmsopheric Pump Set 7

FREIA RF Power Station

FREIA Cryogenic Center

• Multiple users

– external users (dewars)

– horizontal test cryostat

– vertical test cryostat (future extension)

• Liquid nitrogen

– 20 m3 tank

• Helium liquefier & recovery system

– 140 l/h peak at 4 K, 2000 l storage

– 80 m3/h recovery, 100 m3 gas balloon

– ~8 g/s, 80 W peak load at 2 K

supported by

Wallenberg

foundation

Starting Point for the CfT

• Uppsala University will test superconducting devices:

– Double spoke (ESS),

– TESLA (9-cell elliptical, XFEL),

– Elliptical (high β, ESS),

– Solenoid magnets.

• To be superconductive, these devices need to be at temperatures between 4K and 1.8K. These

cavities will be housed in a horizontal test cryostat.

• A sub-atmospheric pump set is needed to lower the pressure to reach these temperatures.

Rocío Santiago Kern 9

http://www.phy.anl.gov/research/SC_Cavities.html

ESS TDR Oct 2012

http://newsline.linearcollider.org/2012/03/29/advances-in-scrf-cavity-performance-in-the-technical-design-phase/tesla-type-cavity-2/

Competitive Dialogue: Sub-Atmsopheric Pump Set

2nd Part

Detailed design

of the

Sub-atmospheric pump set

Integration with Helium Liquefier

• The sub-atmospheric pumps will be connected

to the cryostat and to the liquefier in closed loop

• The helium liquefier will provide liquid Helium

at 4 K

• The 2K pumps will pump on the 2K pot to

reduce the pressure and thus the temperature

• The return Helium gases from the cryostat will

be recycled, compressed and stored

• The capacity of the Helium liquefier is 140 l/h

Cryogenic Scheme

Pressure drop is also important:

this will determine the suction

pressure at the inlet of the pump

Key points of the CfT

• Preliminary delivery date: 31st May 2014 To be discussed

• Overall system dimensions

– XXXX

• The pump set:

– Must include:

• Pumps,

• Local control panel,

• Piping connectiosn between the pumps

– Optional: control system

• Technical requirements:

– Able to handle mass flows of

• 3.2 g/s at 10 mbar,

• 4 g/s at 15 mbar,

• 10 g/s for P ≥ 200 mbar.

– Exhaust pressure regulable between atmospheric and 1.1 bar(a).

– Leak rates

• ≤ 10-6 mbar l/s for the pump

• ≤ 10-8 mbar l/s for the piping

– Designed to work with Helium as operating gas

FREIA Timeline

January February March April May June July

Solid State Amplifier Helium Liquefier Horizontal Test Cryostat

Tetrode Based Amplifer

Sub-Atmospheric Pump Set

To be discussed

Spoke Cavity