Hall A Target Configuration 10/11/2016

General The target configuration can be found in JLAB Drawing TGT-101-1010-0002 Rev A.

Target List and Lifter Positions The positions are adjusted for the 6 mm offset discovered on 10/11/2016.

Target name Lifter position Target Material

Loop 1 33,440,520 4 cm Hydrogen

Loop 2 25,799,944 15 cm Hydrogen

Loop 3 18,161,928 15 cm Hydrogen

4 cm Dummy 13,983,486 Aluminum 3003

15 cm dummy 12,422,910 Aluminum 7075

optics 11,707,646 Carbon Graphite

empty 1 10,425,096 N/A

empty 2 9,709,832 N/A

Thick Aluminum 8,994,568 Aluminum 7075

Carbon hole 8,279,304 Carbon Graphite

BeO 7,564,040 BeO

Carbon 6,848,776 Carbon Graphite

Raster Target 6,133,512 Aluminum 7075/Hole

Home 0 N/A

Target Thicknesses

Hydrogen loops Entrance and exit window thicknesses are given below. Error includes thickness variation and uncertainty in measurement. To start both Loop 3 and 2 are connected to hydrogen. Loop 1 is in standby with helium gas.

Target Entrance (mm) Exit (mm) Length (mm) Material

Loop 1 4cm 0.178 ± 0.008 0.200 ± 0.008 40 ± 0.26 AL 7075

Loop 2 15 cm 0.175 ± 0.008 0.11 ± 0.01 Tip 0.18 ±0.025 Wall

150 ± 0.26 AL 7075

Loop 3 15 cm 0.147 ± 0.008 0.177 ± 0.013 Tip 0.24 ± 0.025 wall

150 ± 0.26 AL 7075

Dummy Targets The dummy targets are aluminum foils mounted on separate frames with foils located at Z positions corresponding to the cryotarget exit and entrance windows.

Target Thickness Total (g/cm2) Material

4 cm Dummy 0.224 ± 0.0014 Al 3003

15 cm Dummy 0.480 ± 0.002 Al 7075

Optics Target The optics target consists of 5 carbon (99.95% C) foils in a linear array with foils located nominally at:

1. Z = 0 cm 2. Z = ± 2 cm 3. Z = ± 5 cm 4. Z = ± 7.5 cm 5. Z = ± 10 cm

Solid Targets Solid targets are located on the solid target ladder nominally at Z = 0.

Target Thickness (g/cm2) Material

BeO 0.142 ± 0.0006 BeO (99%)

C with 2 mm hole near X = Y = 0

0.166 ± 0.0006 C (99.95%)

C 0.167 ± 0.0006 C (99.95%)

Thick Aluminum 1.37 ± 0.007 Aluminum 7075

Raster Tube - Aluminum 7075 tube

Pictures:

solid targets

15 cm flow diverter

15 cm flow diverter Silviu