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TS-SSC 92-076

Executive Summary of June 30, 1992 MSIM (GD San Diego)

TEST RESULTS OF FERMILAB 50 mm APERTURE, POST ASST DESIGN MODEL DIPOLE

Tariq S. Jaffery

DSA331 is the second "Post ASST" design Fermilab built 50 mm aperture short dipole that was cold tested in Lab2 (superconducting magnet test facility at Fermilab). This magnet has gone through two thermal cycles. This magnet showed training at 4.35K during both cooldowns and at 3.8 K in second test cycle, and all the · plateau quenches were in the pole turns of inner lower/upper coils. During the second strain gage run (first cooldown) to high currents the magnet quenched in the lower inner coil pole turn at 6101 A. All quenches with low ramp rates (6, 16,25 A/s), were in straight sections of the inner lower/upper coil pole turn.

DSA331 AVERAGE PLATEAUE QUENCH CURRENTS # quenches ___ _ _220s---.--_22 Qs

The ramp rate dependence of quench current on this magnet is somewhat similar to DSA329 and DSA330. All high ramp rate quenches were in the multipleturn (non pole turn) of the inner lower/upper coil which is not very well instrumented with voltage taps. There were couple of symmetric quenches in upper and lower inner coils at high ramp rates. The cold harmonics measurement data shows b2=3.3 and b4,.,.Q.61 units. at 1 cm. radius. The magnet ends were preloaded to .., 250 lb per bullet. The lead end screws were also torqued to achieve the same preload. AC loss measurements were also made on this magnet .

Distribution: S. Delchamps J. DiMarco J. Jayakumar M. Lamm G. Snitchler J. Strait J. Tompkins M. Wake

TEST RESULTS OF "POST ASST"

DESIGN DSA331 MODEL DIPOLE

Tariq S. J aff ery Fermi National Accelerator Laboratory

MSI Meeting at GD June 30, 1992

TEST RESULTS OF "POST ASST"

DESIGN DSA331 MODEL DIPOLE

I. INTRODUCTION

II. MECHANICAL BEHAVIOR

III. QUENCH BEHAVIOR

IV. HARMONICS

PRESTRESS CHANGE WITH COOLDOWN 1.5 m Long , 50 mm Aperture

SSC Model Dipoles Tested at Fermilab

Coil Stress Change (MPa) End Force Magnet Inner Coil Outer Coil Change (kN) -------------------------------- -----------

w c DSA329(TC1) -34(67.4·33)

DSA329(TC2) -35(67.4-33)

DSA330crc1) -28cs6.4-28.2)

DSA331 crc1> -36c8o.&-44.7)

DSA331 (TC2) -39(82.2-33)

w c (37.8-22)• 16

(37.8-22)· 17

(63.3-46.8)-1 7

(34.9-22)-1 3

(30.5-20.8).;, 1 0

w c

(4.3;5.7) +1.4

(5.6;6.5) + 1 . 1

(4.4;3.0) -1 . 4

(5.1;6.4) +1.4

(6;6.9) + 1 . 0

I --~ ..

'' . , .

Magnet coil cable insulation shim wedge DSA330 UP-out 235 4-I-40 2H+2LT one side +5 (Spalding) LW-out 236 4-I-58 2H+2LT one side +5

UP-in 135 3-S-26 2H+butLT one side +o (1) LW-in 136 3-S-26 2H+butLT one side +o (1)

DSA331 UP-out 240 4-1-58 2NP one side+2NP one side +o LW-out 239 4-1-56 2NP one side+ 2NP one side +o UP-in 140 3-S-26 3NP one side +o LW-in 139 3-S-26 3NP one side (+5) (2)

DSA332 UP-out 237 4-1-58 2H+2LT one side ~ : ..

+10 . ,.. LW-out 238 4-1-58 2H+2LT one side +10 UP-in 137 3-1-66 2H+butLT one side +o LW-in 138 3-S-26 2H+butLT one side +o

DSA 333 UP-out 242 4-1-58 2H+2LT both side +4 (torlon) LW-out 243 4-1-51 2H+2LT both side +4

UP-in 143 3-1-66 2H+butLT both side +2 LW-in 144 3-I-66 2NP+hutLT both side +2

DSA 334 UP-out 4-0-25 2NP+2NP both side (cryorad) LW-out 4-0-25 2NP+2NP both side

UP-in 3-1-66 2NP+butNP both side LW-in 3-1-66 2NP+butNP both side

DCA 320 UP-out 2022 4-S-29 2H+2LT one side +5 LW-out 2023 4-S-29 2H+2LT one side +5 UP-in 1021 3-I-66 2H+butLT one side +o LW-in 1022 3-1-68 2H+butLT one side +o

DCA 321 UP-out 2024 4-S-30 2H+2LT one side +5 LW-out 2025 4-S-30 2H+2LT one side +5 UP-in 1023 3-S-25 2H + butLT one side +o LW-in 1024 3-S-25 2H+butLT one side +o

DCA 322 UP-out 2026 .4-S-31 2NP+2NP both side + o LW-out 2027 4-S-31 2NP + 2NP both side +o UP-in 1025 3-S-35 2NP+butNP both side +o LW-in 1026 3-S-36 2NP+butNP both side +o

DCA 323 UP-out 2028 4-S-32 2NP + 2NP both side +o LW-out 2029 4-S-32 2NP+2NP both side + o UP-in 1027 3-S-40 2NP +but NP both side +o LW-in 1028 3-S-46 2NP+ butNP both side +o

(1) Two 15 mil shims in large wedge. Had difficulty

(2) 15 mil shim in large wedge could have been used insted of 30 mil one. The pole shim of 5 mil was used only in the quadrant 4.

• Standard wedges have 15 mil brass shim in small inner wedges, 30 mil shim in large inner wedges and 10 mil shim in outer wedges to compensate the cable thickness change.

2

KEYS AND SADDLES

INNER COIL KEYS AND SADDLES ON RETURN END:

DSA330

MADE BY RESIN TRANSFER MOLDING PROCESS (G-10 like molded part).

DSA331

G-lOCR, SO NOT CHANGED FROM ASST

END CANS: 6 LAYERS OF KAPTON BETWEEN COLLETS AND COIL ENDS

INSTALLED WITH -67 MPa

COIL INSULATION DSA330 Inner Coils: 1 layer of .001 "x.375" bare kapton H film with 50 % overlap surrounded by 1 layer of .001 "x.375" kapton LT film with .0002" Scotch 2290 adhesive on one side butt lap.

Outer Coils:l layer of .001 "x.375" bare kapton H film with 50 % overlap surrounded by 1 layer of .001 "x.375" kapton LT film with .0002" Scotch 2290 adhesive on one side butt lap.

DSA331 Inner. Coils: 1 layer of .001 "x.375" Apical NP with Cryorad adhesive on one side with 67 % overlap.

Outer Coils:1 layer of .001 "x.375" bare Apical NP with 50% overlap surrounded by 1 layer of .001 "x.375" Apical NP with Cryorad adhesive on one side with SO% overlap.

WEDGE SHIMMING SCHEME DSA33X \

STANDARD WEDGES TO COI\1PENSATE FOR CABLE THICKNESS CHANGE

INNER COILS:

#1 AND #2 (smaller wedges) HAVE .015" BRASS SHIM ON ONE POLE SIDE

#3 (thick wedge) HAS .015 BRASS SHIM ON EACH SIDE

OUTER COILS:

0.010" BRASS SHIM ON POLE SIDE

END CANS: 6 LAYERS OF KAPTON BETWEEN COLLETS AND COIL ENDS

INSTALLED WITH ~67 MPa

Coil Str ess vsD Maqnet Exc 1 t at1 on Inner Coils

60r--r---r--.--r---.-..--.---..-..--.---..-..-...-.-..----.--.-..----.----,--,---,----,-,.--,----r-..,..-,----.---.

50 L

iB OSA331 INNER AQl

~· ! DSA331 INNER AQ2 '" ·r--....'-.. ~

IO 0.... :L '--'

Cl,) Cl,) Q) 30 '-+.> (f)

--I r-1 0 20 u

10

o..._.__._._.__.__._.__.__.__.___._.__.___._ .............. _._ .............. _._ .............. _._....._.__._....__.__._.

0 10 20 30 40 50 60

(Magnet Cur rent) 2 (kA 2 )

Coil Stress VS a Magnet Exc1 tat1on Inner Coils

60~--.-...--.--.-,.--,---.--..-..--,--.--.---,--..........,..--,--..........,..--.--.--.---.--.--.---.--.----.---.---.

+ DSA321 INNER

x OSA323 INNER

501- 0 DSA324 INNER

0 DSA325 INNER

~ DSA101 INNER ):( DSA102 INNER

IO 40[ ~ ~ DSA328 INNER

o_ :x: DSA329 INNER

L: ,.,

DSA330 INNER ;,, '-' 0 DSA331 INNER (I) (I) (l)

L µ (f)

--1 r-1 0 20 u

10

o._.__._ ............. _._....__.___.__.__.__.__.__.__._ .............. _._ .............. _.__.___.__._.....__.__.__.._.__.__, 0 10 20 30 40 50 60

(Magnet Current) 2 (kA 2 )

Magnet Exc1 ta_t1on vso Coil Stress Outer- Coils

so----.--.--.--.--.-..~~~~..--,.---.--.............. -.-...-.---.--.--.--.--.---.--.--..-~

60~ tfl DSA331 OUTER AQl ,,,

DSA331 OUTER AQ2 ~. ,

...... fO

()_

::E: ~

(/) (/) (l) 40 L .j...>

(f)

--1 .-I 0 u

20 l 1.~ j,, ~ )l< ~ ~ ~. -·- ---- ~.,

o._.__._._.__._ ............. _._ .............. _._ .............. _._ .............. _._ .............. _._ .............. _._..___.__._...___.___.__. 0 10 20 30 40 50 60

(M~gnet Current)2 (kA 2 )

'° a_ L:

(/) (/) Q)

'­.µ (f)

~ r-t 0 u

Magnet Exc1 tat1on VS a Coil Stress Outer Coils

so.-.--.-.---.---.-.----.---.--,........,...--.-,........,...---r---r--r----r---r--r---i--r--r---i--.---.---,--,--,.--.--.

,., ,,,

~ ,., ,, "~ ·'tJ'

+ DSA321 OUTER X DSA323 OUTER <> DSA324 OUTER D DSA326 OUTER ~ DSA101 OUTER

):( DSA102 OUTER ,.,

~ DSA328 OUTER :X: DSA329 OUTER ~:E DSA330 OUTER 0 DSA3311 OUTER

o~~~~~~~~~~~~~~~~~_._ ............ _._. 0 10 20 30 40 50 60

(Magnet Current)2 (kA 2 )

z ..:::£. .._,

Q)

u L 0

LL

""O c w

End Force VS a Magnet Exc1 tat1on 40.---.---.--..--..---,-...-.---.-----.--.-.---r-ir--r--r-r-r--,.--r--r---r--.----r--.----.--.-,----r-ir-i

10

0 DSA331 Ql,Q2 AQ1

X DSA331 Ql,Q2 AQ2

01-1---L-..____.__._..____.__,_..___.__._..___.__,_.._.__,_..___.__,_..___.__,_..._,__.__.__..__._,

0 10 20 30 40 50 60

(Magnet Current) 2 (kA 2 )

End Force vs Cl Magnet Exc1 tat1on 40..---.----.-..---.---,--.--.--.-....---.---r---,---,r-r--r-r--r---.--r----r---,-,.--,----,--r-r---r--r-ir---1

+ DSA321

X DSA323 (1st test)

30~ 0 DSA323 C2nd test)

0 DSA324

~ DSA328 TCl ,....... z )::( DSA328 TC2 ~ _,

tft DSA329 Q) (.)

20 :X: DSA330

L 0 3:~ DSA331

LL ""'O c w

10

o.__.___._.__.___._._.__._._.__._ .............. _._ .............. _._ .............. _.._.._.__._.._.__._.._..._._____.

0 10 20 30 40 50 60

(Magnet Current)2 (kA 2 )

CABLES: INNER UP SSC-3-S-00026

LO SSC-3-S-00026

DSA331

OUTER SSC-4-1-00058

SSC-4-1-00056

PREDICTED lq at 4.35 K = 7480 A ; 3.8 K = 8161 A

PLATEAU CURRENTS (Avg): TC1 TC2

(22 quenches ) (22 quenches)

4.3 K = 7633 7649

4.2 K = 7850 7851

3.8 K - ----- 8357

-<( -I-z w 0:: 0:: :::> 0

:c 0 z w :::>

"

9000

8800

8600

8400

8200

8000

7800

7600

7400

7200

7000

6800

6600

6400

6200

DSA331 QUENCH HISTORY (Fermilab built 50 mm aperture, Post ASST Design Model Dipole)

a LI-Ramp splice side • ILM-Multiturn

• LI-Non-Ramp splice side c IUM-Multiturn

• Ul-Ramp splice side • OU-Coil

+ Ul-Non-Ramp splice side A OL-Coil

Q)

(.) • • ••I >-0

cu ..: , .c

• • I-

A. 1:1

c 1:1

•

1:1 El a

• El

• •

• i;i •a a •

SSC Operating Current • --------------------------.----- -------------------~------------------! i ~ • I

i I~

4.3 K

Cj N

! ~ I

I

N . 1111:!' 3.8 K 4.3 K

1:1 I

!.._. \.IUUU I • .. • • - I I I I 0 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

1 0 20 30 40 50

QUENCH NUMBER Temperature Fluctuation ~30-50 mK

-<C --c Q) .... :i.. ::J (.) -Q) c C'I cu :=

DSA331 Quench Current vs Temperature

9000-+-~~~~~~~~~--~~~~~~~~~--~~~~~~~~~~...__~~~~~~~~~-f'-

8000

I 'L-1 ~ ........... .

f MJ.1CAU>1 IiJ _.. ~ lv..~ G,( ee,v, 'P , I ~ '

'f'~it,;~ ~~

7000

m LI-Ramp splice side + Ul-Non-Ramp splice side

• LI-Non-Ramp splice side • OU-Coil

OL-Coil /l. SSample

• Ul-Ramp splice side • 6000

3 4

Average Temperature

Fluctuation in temp. - 30-50 mK .

I

I m m

•

a

(K)

5

. .. --5~5·' · 1 ·-~- -F :.t ·7s· . :-~ .. ,-•·71- ,.;, , . •, (SO•) " · , •*" . r.\. J

2 1/2 · --1 . -j 3/4 ' r -J 3/4'1 .. _ ~, .. ,,-:.~... -1 3/-:..i4·-=- r--2 1/2 '

-l 3/4'---. 3/4 "'-- 3/4·- .l/4'-' • l I f • LeA-D - t...~E.R. 1"'1Wle..'t"

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?ARTS LIST .... a s _ , ..... .,,.,, IORtCINAlOll !STRA I i /KOSK~ :

.u I .xxx ! -a 1- I R . 0 I XON 11 : !: i: l~OC!J) l. I ,_ DW"-1. ..... C>Ca i"'""'DY!:D "I I :. ;: ::Dz..c ....... IUSEI> QI

3 , !:."Mtt4 ....... ~ ~ i------- - -...:...­c. MU, AU. ...ot. UFACIS f M4TDll~

T I A FERlt!I NA.TlONAI. ACctl.ER.ATOR LABORA" V ~1 T£D STATts.D£PIJITMEWl ".OF CNERCY

· DSA3XX -... VOLT AGE TAPS.- . ..

INNER COIL .

-JON::~ -o .. 10'2- MB-263907 I ~c=1-~• ~ ~ - ~ • - • •

8000

7500

7000

6500

6000 0

+ Upper Outer turn

):( Lower Outer turn

0 Inner non pole turn

0 Ramp Splice

+ Upper Inner pole turn splice side

X Lower Inner pole turn splice side

!ft Upper Inner pole turn non-splice sid

X Lower Inner pole turn non-splice sid

330

100 200 300 Ramp Rate (A/sec)

8000

7500

7000

6500

6000 0

+ Upper Outer turn

):{ Lower Outer turn

0 Inner non pole turn

D Ramp Splice

+ Upper Inner pole turn splice side

X Lower Inner pole turn splice side

t!t Upper Inner pole turn non-splice sid

X Lower Inner pole turn non-splice sid

331

100 200 300 Ramp Rate (A/sec)

,,......., ~ ...._,, -+-' Q Q) M M ~ u ..c: (.)

Q Q)

;:j O'

SHORT DIPOLE RAMP RATE DEPENDENCE 8000r--,----.------.~r-i--r---r----i~.---r--y----r~.--.--~----.-~~

7500

7000

6500 + Upper Outer turn

):( Lower Outer turn

0 lnner non pole turn

D Ramp Splice

+ Upper Inner pole turn spllce side

X Lower Inner pole turn splice side

t:B Upper Inner pole turn non-splice sid

:X: Lower Inner pole turn non-splice sid

102

101

326 328 329

330 331 324

6000 L---'--1-~'---'--'-~....__.____.__~....__.____.__~....__.___.____.~_,_____.____. 0 100 200 300

Ramp Rate (A/sec)

Harmonic Components

Magnet pole shim a1 b2 b4 b6 bs b10 DSA321 +o +3.20 +0.22

+o -2.15 +2.95 +0.33 -0.08 +0.05 +0.02 DSA323 +o -0.33 +1.50 +0.13 -0.05 +0.05 +0.02

+o +0.41 +1.38 +0.22 -0.08 +0.06 +0.02 DSA324 -5 +1.94 +0.04

+5 -0.00 +1.76 +0.19 -0.04 +0.05 +0.02 DSA326 +o +0.96 +2.24 +0.28 -0.03 +o.os +0.01

+o +1.03 +2.19 +0.35 -0.07 +0.06 +0.01 DSA328 +s +0.04 +0.43 +0.10 -0.03 +0.04 +0.01

-5 -0.10 +0.01 +0.26 -0.03 +0.06 +0.01 DSA329 -5 -0.05 +l.28 +0.10 -0.03 +0.04 +0.01

+s -0.67 +1.80 +0.08 -0.04 +0.05 +0.01 long +o +0.58 +1.59 +0.29 -0.04 +0.05 +0.02 ave. +o +0.63 +2.30 +0.31 -0.03 +0.05 +0.02 Cal -5,+5 +o.oo +0.34 -0.08 -0.02 +0.04 +0.02 Cal +o,+o +o.oo +0.30 +0.06 -0.04 +0.04 +0.02 Design +o,+o +o.oo -0.18 -0.04 +o.oo +o.os +0.02

Cal +o,+o +o.oo +1.58 +0.40 +0.03 +0.07 +0.02 Cal +o,+s +o.oo +2.54 +0.41 +0.03 +0.07 +0.02 Cal +o,+10 +o.oo +3.51 +0.41 +0.02 +0.07 +0.02 DSA330 +o,1/2H+LTs +1.41 +3.09 +0.63 +0.01 +0.06 +0.02

+0,1/2H+l/2LTs +1.27 +3.94 +0.71 +0.04 +0.07 +0.02

Upper rows are cold measurements at 2000A and lower rows are warm measurements at± lOA. Units are ratio to the dipole component in 10-4 at lcm radius.

\,, ~ \:, I v \o::z. b4 b b Q,

I ce1J l l-1.Sl l +3.3l l +0.6l I +0.03 I +0.7 +0.2

DSA331