Cryogenics for Large Accelerators Dr. Sergiy Putselyk Deutsches - - PowerPoint PPT Presentation

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Cryogenics for Large Accelerators Dr. Sergiy Putselyk Deutsches - - PowerPoint PPT Presentation

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Cryogenics for Large Accelerators Dr. Sergiy Putselyk Deutsches Elektronen-Synchrotron (DESY) MKS Division Notkestrasse 85 22607 Hamburg (Germany) Phone: +49 40 89983492 Fax: +49 40 89982858 E-Mail: Sergiy.Putselyk@desy.de 2 Outline:

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SLIDE 1
  • Dr. Sergiy Putselyk

Deutsches Elektronen-Synchrotron (DESY) MKS Division Notkestrasse 85 22607 Hamburg (Germany) Phone: +49 40 89983492 Fax: +49 40 89982858 E-Mail: Sergiy.Putselyk@desy.de

Cryogenics for Large Accelerators

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SLIDE 2

2

Outline:

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
  • Present and Future 2K accelerators
  • Accelerator Module Test Facility (AMTF)
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SLIDE 3

3

Accelerators at 2K

Accelerator Heat load @ 2K

  • Eq. Refriger.

Power @ 4.5K CEBAF 2*4.2kW 2*18 kW LHC 8*2.4kW 8*18 kW SNS ≈ 2.4 kW ≈ 11 kW FRIB ≈ 4 kW 18 kW XFEL/DESY ≈ 2.4 kW ≈ 11 kW LCLS-II 2*4.6 kW 2*18 kW ESS ≈ 3 kW ≈ 10 kW ILC 14-28(?) *2.4 kW RHIC ≈ 14 kW FAIR/GSI 6+18 kW (?)

Note 1: for XFEL, it could be possible to cover 2K heat load with one 9kW@4.5K refrigerator (this will be cross-checked) Note 2: some refrigerators require also non-negligible 4.5K refrigeration load (e.g. FRIB, Cornell’s ERL) or 4.5K liquefaction load (e.g. SNS, FRIB, LCLS-II, ESS)

There is quite substantial number

  • f accelerators working at 2K

level! The number of accelerators with sc cavities is growing! The large cryogenic system & refrigerators are required!

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Accelerators with s.c. cavities at 2K: cross- sectional view

CEBAF, C-100 SNS, ESS CEBAF, old cryomodule Cornell ERL FLASH, XFEL, ILC LCLS-II

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Accelerators with s.c. magnets at 2 or 4K: cross-sectional view

LHC RHIC SIS300 SIS100

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Accelerators with s.c. cavities at 2 or 4K for heavy ions: cross-sectional view

FRIB, Michigan ISAC-II/ARIEL, TRIUMF Rare Isotope Accelerator, Argonne HIE-ISOLDE, CERN

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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XFEL-cryogenic system -overview

Full design capacity requires

  • peration of two 4.5K

refrigerators in parallel. As a result of refrigerator commissioning, it seems to be feasible to operate XFEL with

  • nly one 4.5K refrigerator at

slightly lower capacities.

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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8

Simplified flow diagram of XFEL accelerator

2 K return 40/80 K forward 40/80 K return, shield cooling 2.2 K forward lead cooling 5 K forward 8 K return, shield cooling 2 K return Injector 1 40/80 K forward 40/80 K return, shield cooling 2.2 K forward 5 K forward 8 K return, shield cooling module string 2 module string 1 warm gas collection pipe Up-graded HERA plant module string 9-10 JTHEX JTHEX Injector 2 (not shown)

Simplified flow scheme 40K -> 80K shield circuit (in series) 5K -> 8K shield circuit (in series) 2K circuit (supply in parallel,return in series)

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Simplified flow diagram of cryomodule string

Note: String connection box contains all cryogenic instrumentation

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 10
  • Complete cold performance tests of all XFEL cryomodules

before tunnel installation (RF measurements, vacuum check, cryo-losses) 103 cryomodules, rate: 1cryomodule/week

  • Cold RF tests of all XFEL superconducting cavities before

cryomodule assembly 824 cavities, rate: 6 cavities/week

  • Cold tests of all superconducting magnet packages before

cryomodule assembly 103 magnets, rate: 1magnet/week

AMTF: purpose & objectives (TDR)

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Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 11

AMTF Hall – Cavities and Cryomodules

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Vertical Cryostat

 Radiation protection shielding

Cavity preparation area Unloading of the cryomodule after transport Cryomodule preparation area

 XATB – module inside

radiation protection shielding

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 12

AMTF – cryogenics contributions

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Red = Wroclaw University

  • f Technology+Kriosystem,

Poland (in-kind) Blue = DESY MKS acting for XFEL company (no in-kind!)

  • > DeMaCo, Netherlands

Green= Budker Institute

  • f Nuclear Physics,

Russia (in-kind)

AMTF – cryogenics contributions

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 13

Helium compressors (DESY in-kind)

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2 sets of compressors for 2K operation at AMTF ( 2 x 20 g/s helium at 20 mbar) 1 set = 12 x parallel pump stations (WS 2001 RUVAC roots vacuum pump + SOGEVAC SV750B rotary vane vacuum pump)

– simple, modular, redundant

In average: about 8000 h operation (status June 2015)

Manufacturer: Oerlikon Leybold

SOGEVAC RUVAC

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 14

AMTF Vertical Cryostats

~Ø Concrete cylinder 140mm thick Vacuum vessel Thermal shield LHe vessel Stainless steel ring 30mm thick Concrete floor Soil Warm magnetic shields PVC pipe DN200 Support Concrete ~

A-A

The lowest radiation shield Cold magnetic shield (MHF-sl) Cold magnetic shield (MKS1) Space for heaters Vacuum lid Vacuum flange max.Ø 3xM20 Ø Ø Ø min. Water drain pipe DN100 (PVC or stainless steel) ~Ø ~

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SPEC DESY April 2009 Design & Construction WUT&Kriosystem Delivery & installation: July 2012 – April 2013 Cavity Frame Design: DESY FLA 6 inserts for AMTF

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Spec DESY (February 2010) Design, Construction, Installation: BINP

First test stand delivered & installed May 2013 (cold commissioning July 2013) Cold commissioning of 3rd test stand December 2013

2 cryostat adapters for the test of single dressed cavities at AMTF

AMTF:3 cryomodule test stands & cryostat adapters

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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L Helium Dewar XAST Valve Box XAVB Sub-Cooler Box XASB

DESY is acting for XFEL company Manufacturer: DeMaCO

Wessington Cryogenics Ltd, UK

XASB, XAVB, XAST

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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SLIDE 17

Cryogenic operation of AMTF

17

  • Supplied

by HERA helium refrigerator.

  • 33

g/s

  • f

LHe and cooling capacities of about 3 kW at 40/80K, 0.5 kW at 4.5K.

  • Modular structure - independent
  • peration of test stands from each
  • ther.
  • Buffering of extra liquefaction in

10000 ltr liquid helium storage dewar (XAST).

  • Missing of air condensation on

cryogenic valves during exchange of modules or cavities.

  • Capacity limits – return gas peak,

screw compressor capacity during cool down/warm-up, 2 dynamic procedures in parallel. XATC1, XATC2

  • Manual pump and purge
  • Cool-down to 4K, liquid helium

transfer and warm-up in automatic mode

  • Manual pump-down to 2K

XATB1, XATB2, XATB3

  • Manual pump and purge
  • Mainly automatically warm-up,
  • Cool-down partially in automatic

mode

Cool down and Warm up

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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All superconducting magnets are tested! In total, >1200 Cavity tests were performed

  • n vertical cryostats.

Specified test rate of accelerator modules is reached ! Total heat load (static+dynamic) in line with budget. Near all results above XFEL specification:

  • accelerating gradient 23.6 MV/m
  • cavity quality factor Q0 =1010 at 23.6 MV/m

Commissioning of two other test benches Leakage of some modules

Summary of preliminary results (status Feb. 2016)

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY

Testing rate is slightly reduced due to lower cryomodule delivery rate

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SLIDE 19
  • Deliveries & installation of XATCs,XASB,XAVB,XATL were “just-in-

time“ for start-up of cavity production

  • Deliveries & installation of XATBs were “just-in-time“ for start-up of

cryomodule production

  • No dedicated debugging of cryo-supply and other systems
  • XATCs design capacities demonstrated
  • Complexity of XATBs commissioning underestimated
  • General effort for installation & commissioning underestimated
  • 1 cryomodule test/week is reached (further ramping-up rate is under

investigation)

  • So far: in budget and almost “in time“ (not “on schedule“)

Some preliminary conclusions

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Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY
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Thank you for your attention !

Beschleuniger-Palavers, GSI, 4 Feb. 2016

  • Dr. S. Putselyk, DESY