Competitive Dialogue - Uppsala University...• Development power station for spoke cavities – soak test with water cooled load, then accelerating cavity, incl. controls – collaboration

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

set


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

2014

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

FREIA Timeline

2014

January February March April May June July

Solid State Amplifier Helium Liquefier Horizontal Test Cryostat

Tetrode Based Amplifer

Spoke Cavity

RF Power + LHe + Vessel + Pumps +DUT

READY TO START

Sub-Atmospheric Pump Set

To be discussed


Documents

Competitive Dialogue - Uppsala University...• Development power station for spoke cavities – soak test with water cooled load, then accelerating cavity, incl. controls – collaboration