A Single DS Magnet Was Built by the Jefferson Lab Machine Shop and Supplied to Magtest

Jefferson Laboratory Technical Note 06-049 “Field Measurements of the CEBAF 15 degree Bend Magnet” Tommy Hiatt

A single DS magnet was built by the Jefferson Lab Machine Shop and supplied to MagTest by Danny Machie. This magnet was assigned the ID name "DS003." This magnet was of the same design as DS002 (measured on 02/11/99) but of different design than DS001 (measured on 02/09/99.)

DS003 was setup and measured on the Automated Stepper Stand on 10/06/99. A longitudinal run was made from z = +53.5 to z = - 53.5 cm. in 0.2 cm steps inside the magnet and 1.0 cm steps through the fringe field. A longitudinal run was taken at transverse positions of x = 0, 0.5, 1.0, and 1.5 cm. For all measurements the magnet was set to 2.50 amps. Data was recorded in the file "ds00312.stp" and analyzed in the Excel file "DS003 Analysis.xls" The remnant (ie Earth's) field far from the magnet was an average of 0.41 Gauss and was subtracted from all points. That is, all values given below are corrected for Earth's field.

Plotted in Figure 1 are the longitudinal profiles at the various transverse locations. Listed in Table 1 are the peak field and field integrals for DS003 at the various transverse positions. For reference, the values for DS002 are given in Table 2. Shown in Table 3 is a comparison between DS002 and DS003 at the transverse center. Although the peak fields agree to 1.6%, the difference in field integral differs by 6.0%. Plotted in Figure 2 is the normalized transverse profile of the field integral for DS002 and DS003. A photo of the magnet mounted for measurement is shown in Figure 3. In this photo the positive X axis is to the left.

Longitudinal Profile

30.0 x=-1.5 x=-1.0 )

s 25.0 x=-0.5 s u

a x=0.0 G (

x=0.5 d

l 20.0

e x=1.0 i F x=1.5 k a e

P 15.0

-5.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 20.0 30.0 40.0 Longitudinal Position (cm.)

Figure 1 - Longitudinal Profile

0f11162b349a69a32e3b52b2441cbf96.doc - 05/19/18 - Karn Page 1 of 4 0f11162b349a69a32e3b52b2441cbf96.doc - 05/19/18 - Karn Page 2 of 4 Field and Field Integral at Transverse Position Parameter x=-1.5 x=-1.0 x=-0.5 x=0.0 x=0.5 x=1.0 x=1.5

Bpeak (G) 44.30 44.56 44.50 44.49 44.56 44.61 44.34 BL (G-cm) 352.54 358.35 359.06 359.90 359.51 357.96 352.03

Leff (cm.) 7.96 8.04 8.07 8.09 8.07 8.02 7.94 BL Dev. -2.04% -0.43% -0.23% 0.00% -0.11% -0.54% -2.18% Table 1 - DS003 Peak Field and Field Integral at 2.50 Amps

Field and Field Integral at Transverse Position Parameter x=-1.5 x=-1.0 x=-0.5 x=0.0 x=0.5 x=1.0 x=1.5

Bpeak (G) 43.40 43.95 43.85 43.80 43.80 43.85 43.70 BL (G-cm) 329.79 336.03 337.51 338.34 338.03 336.00 332.89

Leff (cm.) 7.60 7.65 7.70 7.72 7.72 7.66 7.62 BL Dev. -2.53% -0.68% -0.25% 0.00% -0.09% -0.69% -1.61% Table 2 - DS002 Peak Field and Field Integral at 2.50 Amps

Parameter DS002 DS003 Deviation

Bpeak (G) 43.80 44.49 1.6% BL (G-cm) 338.34 359.90 6.0%

Leff (cm.) 7.72 8.09 4.5% Table 3 - Comparing DS002 and DS003 at x = 0

0f11162b349a69a32e3b52b2441cbf96.doc - 05/19/18 - Karn Page 3 of 4 Transverse Integrated Profile

-0.5% ) % (

r e t -1.0% n e C

m o r f

n o i t -1.5% a i v e D

a DS003 (10/06/99) r

g DS002 (02/11/99) e t n I

-2.0% d l e i F

-3.0% -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 Transverse Position (cm.)

Figure 2 - Normalized Transverse Profile

Figure 3 - DS003 with positive X axis is to the left

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