The D0 Magnets

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R. P. Smith

The D0 Magnets

Shifter’s Tutorial

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April 14, 2003 Shifter's TutorialR. P. Smith

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Where are the Magnets?

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The D0 Magnets

Muon Toroids From Run I, modified

WAMUS Toroids: CF (||<1), EF(1<||<2.5) now electrically in series, Operating current reduced from 2500 to 1500 A (B from 1.9 to 1.8 T) to reduce operating costs

SAMUS Toroids (2.5<||<3.6) removed Elegant new control system Large Iron Forward Shields inserted in

SAMUS locations

Central Tracking Solenoid New for Run II

Superconducting 2T ~1 X0

Procured to Detailed Specification

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A Brand-new Control System for the Toroids

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Toroid Fields?

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Why Must I Degauss My Monitor Each time the Magnets are Charged?

DAB Location CF + Sol +, CF +

Catwalk, East End 1.9 2.0

Catwalk, West End 1.0 1.0

Catwalk, Solenoid Current Bus Housing 1.5 90

Catwalk, Top of UPS 1.6 2.5

Catwalk, On Beam Line 2.0

Ladder Top, Near Vending Machines 1.6 1.8

Third Floor Counting Room 1.5 2.0

Second Floor Counting Room 1.5 3.0

First Floor Counting Room 2.0 2.0

Third Floor Moveable Counting House 2.0

Second Floor Moveable Counting House 2.7 3.0

First Floor Moveable Counting House 2.0 2.0

Cable Winder outside Second Floor MCH 1.0

DAB 1 CleanRoom South Grill Door 2.0 3.0

DAB 1 CleanRoom Canvas West Wall 1.7 6.0

DAB 1 South Stairwell 1.5 1.5

DAB 1 North Stairwell 1.5

Control Dewar Platform 1.5 3.0

Control Dewar Frostproof Box 1.5 12.0

Control Dewar Current Buses 1.5 100

Assembly Pit South Safety Rope 2.0 7.0

Assembly Pit North Safety Rope 2.0 12.0

Fieldmapper Control Station 3.0

During Fieldmapping, in AH, no EF

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D0 Solenoid

What does it do? Where is it? When was it done? How does it work? Fieldmapping Unfinished Business

The D0 Solenoid

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Castilla at LaThuile

pT > 1.5 GeV &

J/J/ pT > 3.0 GeV > 3.0 GeV

SMT hits>3 & CFT hits>4

J/J/’s: 75,013’s: 75,013

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More LaThuile

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Yet More LaThuile

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And Filthaut at Moriond

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More Moriond

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Highlighting the Solenoid

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View During Run II Roll-in

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Upgrade Wish List

Requirements

Field: Good momentum and mass resolution with tracking: sagitta ~ BL2

B as high as prudent (Zeus = 1.8 T?) Transparent Must fit in r => 2T Geometry: Must fit and be radially thin.

2.8m long; 55 < R < 70cm; “No” Fe return yoke

Field Uniformity:Graded winding; higher current density at the coil ends (ala Zeus, Aleph)

Thin coil:

1 Xo of Al: Coil + bobbin, cryostat

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Central Field 2.0 TOperating Current 4820 ACryostat Warm Bore 1.067 mCryostat Length 2.729 mIntegrated Field Homogeneity +/- 0.005Stored Energy 5.6 MJInductance 0.48 HConductor High Purity Al StabilizedCooling Indirect, 2-phase forced flow

heliumCold Mass 1500 kg approxTransparency 0.9 Xo

Two winding layers with 1.3 J at ends for improved field homogeneity:

Two Conductor Sizes for 1.0 J, 1.3 J:

0.00

5000.00

10000.00

15000.00

20000.00

25000.00

0 15

30

45

60

75

90

105

120

135

150

165

180

195

210

225

240

255

270

285

300

315

Z (cm)

Gau

ss

Bz, r = 50.4

Bz, r = 10.2r1r2

14.7 x 4.02 14.7 x 5.33

What Is It?

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Technical Specifications

~ 1.47

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Plus seismic loadings, iron decentering, FNAL ES&H, etc., etc.

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And I= 105% for 8 Hrs

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When Was it Done?

D0/Fermilab Magnet Study Team Formed: 10/3/92 PAC Approval of D0 Upgrade w/ Magnetic Tracking: 7/27/93 Fermilab Review of Magnet Conceptual Design: 8/11/93 Fermilab Magnet Procurement Readiness Review: 12/13/93 SEB Formation: 2/23/94 AIP Approved 5/13/94 Final Draft Magnet Technical Design Report: 5/13/94 Director’s Review D0 Upgrade 5/27/94 SEB Report: 12/15/94 Subcontract Award to Toshiba 1/18/95 PDR 1 (at FNAL) 3/15/95 PDR 2 (at FNAL) 5/31/95 FDR 1 (at Keihin) 7/22/95 FDR 2 (at Keihin) 10/3/95 FDR 3 (at Keihin) 3/19/96 FPR 1 (at Keihin) 4/22/96 FPR 2 (at Keihin) 7/23/96 FPR 3 (at Keihin) 10/14/96 CD Test (at Keihin) 12/3/96 System Test (at Keihin) 2/26/97 Magnet System arrives at Fermilab 5/12/97 Magnet (+ Preshower Detector) Installed in Detector 6/16/98 Magnet at 2.0 T at FNAL 9/11/98

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Who Did It?

H. E. Fisk, R. P. Smith, R. Yamada (“ret”), M. Mostafa , K. Krempetz, R. Rucinski, D. Markley, R. Hance (ret), W. Jaskierney, Del Miller and crew, R. L. Schmitt, B. Squires, R. Fast(ret)

R. Kephart, A. Tollestrup, P. Martin, P. Mantsch, T. Nicol, J. Strait, R. Walker, R. Huite

Fermilab:

Toshiba: S. Mine, T. Kobayashi, K. Kimura, W. Odashima, H. Kozu, S. Ito

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QC Checking

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Fieldmapping at Keihin

Mapping at Batavia, 1998

Mapping at Keihin, 1997

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Delivery – Keihin to Batavia

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Solenoid Arrival at Fermilab, May 12, 1997

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Solenoid + “Obround” Chimney Segment

Ready for Installation of Preshower Detector

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Detail for Solenoid Cryo System

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Cryo Energization Permit

Energization System can charge Magnet iff Cryo Permit is Enabled, Accelerator

Permit Enabled

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Solenoid Energization System Control

Fast ( ~ 11 sec) Emergency Discharge: Quench Detected

Slow ( ~ 300 sec) Discharge: All Other

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Solenoid Protection System

Fast Dump

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D0 Solenoid Energization Control Console

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Fast Discharge Test (Causes Quench)

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Lower Field Joint Voltage Drops

Lower Joint Voltage Drop

0

200

400

600

800

1000

1200

0 1000 2000 3000 4000 5000

Magnet Current

Mic

rov

olt

s

Positive

Negative

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Solenoid in D0 Detector

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Fieldmapper MK II

Survey of the FieldMapper

z

Encoder

Laser Tracker

Homing positions

Mirror

-5

-4

-3

-2

-1

0

1

-150 -50 50 150z [cm]

Ver

tica

l sa

g [m

m]

MK I

MK II

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Fieldmapper in Solenoid

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Fieldmapper Moving Arm with Hall Probes

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NIKHEF Hall Probes

“Outer” Probes

Inner Probes

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NIKHEF Inner Hall ProbesFNAL NMR Probes

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Typical NIKHEF Inner Probe Locator Strip with 3 Probes

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TOSCA 3D Model

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TOSCA Predictions ?

NMR (R = 53) = 20143 +/- 3

Hall Probes (same R) ~ 20130 +/- 10

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“Looks” OK

Br(HallProbe) = Brcos()+Bzsin()

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Not So Fast…

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How Do Hall Probes Work?

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HDHPW II

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Br Fix at Hand

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Some Fieldmapping Success

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Run II Operation

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D0 STAR

4 g/s = 114 l/hr

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Operating Stability ?

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6 Volt Fast Energization

0500

1000150020002500

300035004000

45005000

13:4

0:00

13:4

1:27

13:4

2:54

13:4

4:21

13:4

5:48

13:4

7:15

13:4

8:42

13:5

0:09

13:5

1:36

13:5

3:03

13:5

4:30

13:5

5:57

13:5

7:24

13:5

8:51

Time of Day

Am

per

es

0

20

40

60

80

100

120

140

160

Kel

vin MAGCUR

TR3343H-T

TR3344H-T

TR3345H-T

6 Volt Fast Energization

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

13:4

0:0

0

13:4

1:2

4

13:4

2:4

8

13:4

4:1

2

13:4

5:3

6

13:4

7:0

0

13:4

8:2

4

13:4

9:4

8

13:5

1:1

2

13:5

2:3

6

13:5

4:0

0

13:5

5:2

4

13:5

6:4

8

13:5

8:1

2

13:5

9:3

6

Time of Day

Am

pere

s

0

10

20

30

40

50

60

70

80

90

100

Kelv

in

MAGCUR

TR3330-T

TR3335-T

TR3333-T

Factory Tests at Toshiba

Conductor temperatures

Support cylinder temperatures

S end

N end

Center

S end

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Cooldown

Cooldown from 300 K to 4.5 K

Cooldown detail below 80 K

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Cooldown

Cooldown from 300 K to 4.5 K

Conductor Stabilizer

1

10

100

1000

10000

0100200300

Coil Temperature (K)

Re

sis

tiv

ity

Ra

tio

0

0.5

1

1.5

2

Re

sis

tan

ce

(O

hm

s)

RRR

Res

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Precision Load Line via NMR

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First Fieldmapper Data at D0

Documents

The D0 Magnets