[FFA_CEBAF_Collab] FFA at CEBAF WG mtg. this Friday, Feb. 25 at 11:00 am

[Jay Benesch]

Colleagues,

Attached find a 400 word summary of the possible FOA response I brought 
up ten days ago.  We can discuss this Friday at the meeting or by email 
before then.  I will NOT contact Ramesh Gupta, the only SC magnet person 
remaining at BNL that I knew from SSC days, without sign-off from the 
group and management.

For those with JLab Ops accounts: the drawings I used to compile the 
table are in ~benesch/magnets/FFA .  The BdL values used are from CED. 
The txt file has CED field maps and notes I made in preparation of the 
table in the pdf.

Jay
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Magnet ID  : YAAT01

Vacuum vessel length 54.84 inches 139.3 cm  Moly 2.44 mm (0.096") max.  min beam sep ~10 mm
WR3 WG used as conductor.  Hole size: inches(mm)
0.034 [0.8636] 
0.017 [0.4318] 
Scaling the drawing, since I can't find a WG vendor with outside dimensions, I deduce 0.020" wall thickness and 0.002" corner radius.  0.001" corner radius inside hole.  Overall area 4.2054E-3 sq in.  Hole area 0.5749E-3 sq in Copper area 3.6306E-3 sq in 2.3423 mm^2.  
	At 70 A, J = 30 A/mm^2.  Need double that to double energy.
Insulated 5 turn coil pack: 0.07" by 0.47" 

Core length 100 cm 
Insulated coil pack sticks out 0.5" on either side of core before individual pieces of WG are separated for water circuits and connection to big conductor on back leg.  

Backleg coil has five turns of 0.188" square with 0.125" diameter hole, except each end has a 0.125" OD 0.020" wall tube brazed in for water connection.  Assume just the square section: 23.07E-3 sq in or 14.885 mm^2.  Only 4.7 A/mm^2 here.  Water cooling still needed, barely.  Doubling this J not a problem with our LCW.  

Meas.  #   : GENERIC
Meas. Date : 07/28/13
Coil used  : Stretched Wire
Current (amps)    INT(Bdl) (Gauss-cm)
0.00    0
4.01    -2381
24.03   -12178
28.03   -14152
33.04   -16628
37.04   -18599
42.05   -21099
47.05   -23585
51.06   -25575
56.07   -28071
61.07   -30573
65.07   -32559
70.08   -35052   /100  = 350 G 
65.07   -32559
61.07   -30573
56.07   -28071
51.06   -25575
47.05   -23585
42.05   -21099
37.04   -18599
33.04   -16628
28.03   -14152
24.03   -12178
4.01    -2381
Magnet ID  : YBBS06

vacuum vessel 49.81" with one flange at 1° angle.  SS between beams 3.28 cm max, 3.12 mm nom
YB steel core 37.83" (96.09 cm) 

back leg conductor 0.438" sq, 0.25 dia hole, corner radius ~0.04" aka 1 mm 
four packages of six turns each, insulated dimension 0.53" x 3.02" so 24 turns total
Copper 0.89 cm^2, J 5.025 A/mm^2 at 447 A

Septum conductor: four packages 0.245" x 0.996" consisting of six conductors 0.240" x 0.160", with 0.125" diameter hole.  Sharp corners drawn, assume 0.02" radius.  Copper 0.1607 cm^2, 
J 27.8 A/mm^2 at 447 A.  

Meas.  #   : GENERIC
Meas. Date : 04/30/14
Coil used  : Stretched Wire
Current (amps)    INT(Bdl) (Gauss-cm)
0       0
3.99    -6239
202.96  -234888
226.96  -262569
251.95  -291311
275.95  -318949
300.95  -347724
324.93  -375345
348.93  -403015
373.93  -431776
397.92  -459323
422.92  -488158
446.91  -515682   /96.09 = 5367 G
422.92  -488158
397.92  -459323
373.93  -431776
348.93  -403015
324.93  -375345
300.95  -347724
275.95  -318949
251.95  -291311
226.96  -262569
202.96  -234888
3.99    -6239
0.00    0


Magnet ID  : YRAT02

vacuum vessel 89.06" long.  Stainless between beams: 5.04 cm nominal, 5.06 cm max. 
core 76.70" long, not rectangular  (194.8 cm)

back coil same conductor as YB so area 0.89 cm^2 and J = 7.73 A/mm^2 at 688 A

front coil same conductor as YB so area 0.1607 cm^2, J = 42.8 A/mm^2 at 688 A

Meas.  #   : GENERIC
Meas. Date : 07/28/13
Coil used  : Stretched Wire
Current (amps)    INT(Bdl) (Gauss-cm)
--------------    -------------------
0.00    0
3.94    -12784
317.94  -712982
354.95  -795359
391.94  -877692
428.95  -960198
465.94  -1042389
502.94  -1124898
539.95  -1207301
576.95  -1289490
613.95  -1371719
650.95  -1453604
687.95  -1535720    /194.8 = 7883 G 
650.95  -1453604
613.95  -1371719
576.95  -1289490
539.95  -1207301
502.94  -1124898
465.94  -1042389
428.95  -960198
391.94  -877692
354.95  -795359
317.94  -712982
3.94    -12784
0.00    0



Magnet ID  : ZA8T04

core length 117.40" (298.2 cm)
vacuum chamber 131.85" (334.9 cm) flanges canted, nom stainless between beams 3.36 cm

back leg coil: Luvata 8327 brazed into 0.531" (13.49 mm) by 0.489" (12.42mm )copper bar so 160.63 mm^2 Cu.  J= 5.07 A/mm^2

front leg: Luvata 8327 alone 4 mm by 6 mm with 0.8 mm corner radius, 2.5 mm hole, 17.08 mm^2 Cu
J= 47.7 A/mm^2 at 814 A

Meas.  #   : GENERIC
Meas. Date : 07/28/13
Coil used  : Stretched Wire
Current (amps)    INT(Bdl) (Gauss-cm)
--------------    -------------------
0.00    0
3.94    -25470
384.95  -1314267
426.96  -1456990
469.96  -1602770
512.97  -1748283
555.96  -1893249
598.96  -2037957
641.99  -2182132
684.98  -2325844
727.99  -2469098
771.00  -2611365
814.01  -2753439   /298.2=9234 G
771.00  -2611365
727.99  -2469098
684.98  -2325844
641.99  -2182132
598.96  -2037957
555.96  -1893249
512.97  -1748283
469.96  -1602770
426.96  -1456990
384.95  -1314267
3.94    -25470
0.00    0