slide1
Download
Skip this Video
Download Presentation
Current leads for FAIR Cryogenic Expert Meeting 19./20. September 2007 Birgit Weckenmann

Loading in 2 Seconds...

play fullscreen
1 / 10

Current leads for FAIR Cryogenic Expert Meeting 19./20. September 2007 Birgit Weckenmann - PowerPoint PPT Presentation


  • 122 Views
  • Uploaded on

Current leads for FAIR Cryogenic Expert Meeting 19./20. September 2007 Birgit Weckenmann. Overview. 1. Design options for current leads 2. Current leads needed for FAIR 3. HTS leads in LHC at CERN 4. Cooling of HTS leads 5. Adaptation of CERN leads for FAIR. Conventional vs. HTS leads.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Current leads for FAIR Cryogenic Expert Meeting 19./20. September 2007 Birgit Weckenmann' - thibault-jaycob


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1
Current leads for FAIR

Cryogenic Expert Meeting

19./20. September 2007

Birgit Weckenmann

slide2
Overview

1. Design options for current leads

2. Current leads needed for FAIR

3. HTS leads in LHC at CERN

4. Cooling of HTS leads

5. Adaptation of CERN leads for FAIR

slide3
Conventional vs. HTS leads

HTS design

Resistive design

He gas 300K

He gas 300K

metal

He gas 50K

metal

HTS

LHe 4.4K

LHe 4.4K

+ simple (standard) design

+ no quench protection

+ no additional instrumentation

and control

+ reduction of cryogenic losses

(~2.5 W/kA in DC operation)

slide4
Low-current leads

Conventional leads are chosen for all low current circuits with Imax≤ 300A

Possible saving in cooling power by using HTS: 1500W => considering the large number of leads no benefit of that design

Resistive leads are available in optimized design for several currents and can be purchased (Mark & Wedell, American Magnetics)

slide5
High-current leads

HTS leads are chosen for all high current circuits

with Imax≥ 300A

Saving in cooling power: 3700W => 87% reduction compared to resistive option

=> 15% of total cryogenic load of FAIR

Adaptation of current lead design of LHC in collaboration with A. Ballarino (CERN)

slide6
LHC current leads

13000A type:

optimized for DC current of 13000A

Resistive part:

copper heat exchanger

convection-cooled by forced flow of helium gas at 20K

6000A type:

covering currents ranging from

3900A to 6900A

HTS part:

Stacks of BSCCO-2223 tapes soldered on SS tube

conduction-cooled by liquid helium bath at 4.4K

slide7
FAIR

HTS leads

Cooling conditions

LHC:

Cooling of resistive part with 20K Helium gas

=> HTS at 50K

=> m = 0.045 g/(s kA)

FAIR:

Cooling with gas at 50K results in a higher temperature of the HTS and a higher mass flow rate

=> HTS at 60K

=> m = 0.065 g/(s kA)

(mass flow rate in pulsed operation will probably be lower)

slide8
Adaptation of LHC design for FAIR leads

Planned tests of CERN leads at ENEA (Italy) to prove the applicability of the LHC design to FAIR with 6000A type and 13000A type LHC leads provided by CERN

1. Test: Stable operation under changed cooling conditions

=> Cooling of the resistive part with 50K gas

DC operation at all currents required by FAIR magnets

2. Test: Stable operation and quench behaviour in pulsed mode

=> 10 triangular cycles increasing ramp rate and current step by

step

Expected modifications:

- Redesign of the heat exchanger (diameter)

- Variation of HTS stacks (number)

slide9
SIS100/SIS300 leads
  • One or more designs for FAIR leads?
  • Current range
  • SIS 100: 4600A to 6600A
  • SIS 300: 7900A to 9000A
  • Connection HTS to LTS
  • SIS 100: Nuclotron conductor
  • => adapter or change from bath
  • to indirect cooling (???)
  • SIS 300: Rutherford cable
  • => CERN design
  • => Two different designs may be reasonable
ad