Cryogenic Operations Conference 20043 Pioneering Science and Technology Office of Science U.S....

A U.S. Department of EnergyOffice of Science LaboratoryOperated by The University of Chicago

Argonne National Laboratory

Office of ScienceU.S. Department of Energy

Cryogenic Operations Conference 2004“Operation Overview” 03/30/04

ATLAS Cryogenic System and Operational Experience

J. R. SpechtS. W. MacDonaldR. C. Jenkins

2

Pioneering Science andTechnology

Office of ScienceU.S. Department

of Energy

Presentation Overview

• ATLAS Facility Overview• Present Cryogenic System• Controls• Major Upgrades and Redundancies• Operating History• Future Plans• Questions

J. Specht March 30, 2004COC-2004

3



of Energy

ATLAS Facility Overview• Argonne Tandem Linear Accelerating System (ATLAS)• World’s First Superconducting Ion Accelerator• Located at Argonne National Laboratory• National user facility funded by DOE • Accelerator Specifications

- 50 MV CW superconducting linear accelerator- 60 niobium resonators and 33 so lenoids in 10 cryostats- 4 bunchers- moderate size faci lity- 50 meters SC linac- 3 LHe refrigerators - 800 W.

• Staged construction- 1976 Booster - 1630 Refrigerator- 1985 ATLAS - 2800 Refrigerator- 1991 PII - 2800 Refrigerator


4



of EnergyJ. Specht March 30, 2004COC-2004

5



of Energy

FY 03 Beams – 5,500 Hours On Target

11B

12C

14N

15N

16O

20Ne

24Mg

32S

36Ar

37Cl

40Ca

48Ca50Cr51V

54Fe

56Fe

56Ni

58Ni

64Ni64V

84Kr

85Kr

90Zr

92Mo

107Ag

136Xe

86Kr

208Pb

178Hf

238U3He

7Li10B182W

180Hf

182Hf 184Hf


ATLAS LHe FLOW SCHEMATIC

6



of Energy

2800E

N.C. VALVE

N.O. VALVE

4TT

2TT

5TT 3TT 1TT

BOX TT

6T 5T

3T

2T

1T

PHASESEPARATOR

(1000L)

1K HX K

CONTROLLED VALVE

2X1X5W4W1W 2W

3X6W3W

6G

5G

2G1G2F1F

4G

3G3F

HX F

File #ATALSHE2.VC6

J.R.Specht1/15/96REV 1: 09/03/03

B5M5B4

HX E

GF

2E

3E3V 6V

1E5V4V2V1V

1R

2R

BOX R

4U

3S

2S

1S

2U1D 1U

3U

3WE1

EB3B2

HX J

2800W

3MM

(1000L)L DEWAR

HX L1L

TESTCRYOSTAT

2D1C2C1B

HX C

3B 3C

HX C

4A

5A

2A 1A

6A

3A

B1 A CB D

6M4M 2M

3Z

BOX M1N

5M

7M

3M3N

4P5P

6N3P6P

N

5N4N2P 1P

WE 3

OP

4T

BOX EBOX V BOX GBOX F BOX XBOX W

WE 1

BOX A BOX C

WE 2

K DEWAR

BOX P

BOX MM1630

BOX U

1Z

BOX N

BOOSTER LINAC CRYOSTATS

2B

BOX BHX B

BOX Z

BOX T

PII LINAC CRYOSTATS

2N

2WE11WE1

BOX S

1MM 2MM

ATLAS LINAC CRYOSTATS

2Z THROTTLE VALVE

1M

ATLAS LHe SYSTEM

BOX D

(1000L)J DEWAR

3D

4D

1J


7



of Energy

CTI Model 2800

• 300 Watts• 40 to 80 liters per hour• 1 Watt/1000 Watts

efficiency• 2- Sulzer gas bearing

turbines• LN2 Precooling• 3 RS Screw

compressors per refrigerator

• CTI Wet engine


8



of Energy

RS Compressors

• 10 Total (2 Spare)• Single Stage Screw• 18 g/sec each• 18 bar• 100 KW power

consumption (each)


9



of Energy

Positive Ion Injector (PII) Cryostats and Resonators

• Box style cryostat for ¼ wave resonators

• Gravity feed• Hinged field joints

J. Specht COC-2004 March 30, 2004

10



of Energy

Booster and ATLAS Cryostats and Resonators

• 6 Resonators and 4 solenoids per cryostat

• Parallel fed within each cryostat• Forced flow required do to

resonator shape

• Rigid LN2 shielded U-tubes


11



of Energy

Valve Boxes

• 5 Boxes contain sub-coolers • LN2 Shielded


12



of Energy

Diagnostics and Control

• Manual control of refrigerators, compressors, and most valves

• Control on dewar pressure• Alarm computer

- Auto dia ler for off-shift notification

- Contro l room notification• Cryo system set to match load

requirements for each experiment

J. Specht COC-2004 March 30, 2004

13



of Energy

Major Upgrades / Redundancies• Upgrades

- Wet Engine – increased each refrigerator efficiency ~ 30%

- Variable Speed Drive – on one compressor for each refrigerator

- Auto-start for po wer bumps- Alarm PL C

• Redundancies- Cooling Water System - Contro l air- E lectrica l po wer- He gas tanks- Multip le compressors- Multip le refrigerators and

interconnections


Power Bumps

14



of EnergyJ. Specht March 30, 2004COC-2004

15



of Energy

Major Upgrades / Redundancies• Upgrades

- Wet Engine – increased each refrigerator efficiency ~ 30%

- Variable Speed Drive – on one compressor for each refrigerator

- Auto-start for po wer bumps- Alarm PL C

• Redundancies- Cooling Water System - Contro l air- E lectrica l po wer- He gas tanks- Multip le compressors- Multip le refrigerators and

interconnections


16



of Energy

Variable Speed Drives

- 125 hp- 480 V - 3 phase- One per Refrigerator- Easy Load Matching- Efficient

- Compressor loaded


17



of Energy

Operating History• Staffing

- ½ engineer - 1 ½ Technicians

• Maintenance- Compressors 80-125K hours- Refrigerators- Augment helium with 500 liter

dewars• Annual Costs

- LN2 1.1 million gallons ($275K)- LHe 13 K liters ($39K)- Electricity 5 BWH ($230K)- M&S ($30K)

• System Pros and Cons- 3 refrig. allow flexibility- All welded system allows fewer

leaks but high repair costs- No Gas purification

• SRF Tests

• System Problems- Vacuum break locations- He gas contamination- 3 Sections not optimized- LN2 tank valves- Refrigeration contingency- Oil Contamination of Refrigerators- 80K Trap Failures

• Future Plans- 2800 Center installation- Separation of the 3 sections- Valve automation- Control system, alarm, automation


18



of Energy

Summary

• ATLAS Facility Overview• Present Cryogenic System• Controls• Major Upgrades and Redundancies• Operating History• Future Plans• Questions


Date post:	11-Mar-2020
Category:	Documents
Upload:	others
View:	0 times
Download:	0 times

Cryogenic Operations Conference 20043 Pioneering Science and Technology Office of Science U.S....

Documents