Uranium setup for the neutrino line experiment

Schematic diagram of Booster_BtA_AGS Complex

Booster

BtA

AGS

SS_A06 Injection Point and Matching point

SS_L20_Injection Septum

Exit SS_F6_Septum Extraction Point Beginning of BtA

SS_A05_kicker

SS_F03_kicker

L20 Pos. & Ang. Inj. Bumps

Extraction Bumps

G and H extraction bumps to AtR

H10 Extraction Septum to AtR

U_L

ine

SS-H13 Start AtR Line

Schematic arrangement of current transformers and Flags/stripping foils in the U/W line during U+90 +91 +92 transport

4.250 bend

uxf1

Uf2

uxf3

Au

+77 +

78 +7

9

80 bend

200 bend

U+90U

+90 +91 +92

wxf1 U+90 +91 +92

W fo

il 0.

025

mm

Uf3

Uf4

Uf5

Wf1

Wf2 Wf3

Uf1,Uf2,Uf3,Uf4, Uf5 (2 mil Gd2O2S:Tb on 1 mil Al subtray)

Wf1,Wf2, Wf3 (2 mil Gd2O2S:Tb on 1 mil Al sub tray)

Uf1

Uranium beam at AGS Extraction

• species 238U+90 • B=92.816 Tm• rel=0.995125• =10.14065• t=25 ns

Beam Optics (AGS to target of Neutrino Line)

• Establish circulating beam in AGS at extraction energy with extraction bumps turned on.

• Start at G10 kicker location (G10 kicker ON) and transport the beam down to neutrino line.– Constrains used in beam transport:

• Maintain beam size to clear beam apertures.• Beam achromatic at the target location???

Stripping effect of Wstripper or Uf2 on U+90

How do we reduce the beam at the target to 5000 particles/bunch

• Focus the U+90 on target and use dipole and quadrupoles to deflect the core of the beam and also defocus it.

• Focus the U+90 on target and use insert the Wsripper and/or the Uf2 flag to strip away the tripped U ions and hope the intensity of the unstripped ions is good enough to be detected at the target. Alternatively change the setting of the 8o bend to allow the U+91 beam which has higher intensity..

• Focus the U+90 on target and use insert flags down stream of the 8o bend. Defocus the beam using Q10 to Q13 qudrupoles.

Stripping of 10.3 GeV/n Au+77 ions Using: a) 1.0 [mm] Al2O3

b) 0.025 [mm] W foilc) 0.051 [mm] Gd2O2S:Tb on 0.0254 [mm] Al

Only results from measurements are presented.

For any other information on the measurements please conduct

tsoupas@bnl.gov

tsoupas@bnl.gov

Schematic arrangement of incoming Au+77 ions, the stripping foil and the ions emerging after the foil

Stripping foil

Au+77 Au+77 Au +78 Au+79

tsoupas@bnl.gov

Measurements of some quantities after stripping.See next slide for explanation

Stripping Foil Mat.

[mm]

Au+79 [%]

Au+78 [%]

Au+77 [%]

E[%]

e[%]

Fragm.[%]

0.025W

99.8 0.2 0.0?? <0.05 <5 <0.5

1.0Al2O3

99.99 0.01 0.00? 0.25 20 4.0

0.051Gd2O2S

76 22 2 <0.05 <5 <0.5

* The symbol “<“ in the Table signifies that the value of the measured quantity is below the resolution of

the measuring device.

Explaining the Table of the previous slide

Column# Remarks

1 Thickness and composition of the stripping material2 Fraction of charge state Au+79 emerging from striping foil.

Current transformers were used if all the charge state populations were >1%Visual Flags were used if any of the charge state populations were <1%

3 Fraction of charge state Au+78 emerging from striping foil.4 Fraction of charge state Au+77 emerging from striping foil.

The visual Flags indicated the presence of Au+77 but it was difficult to quantify.

5 Energy loss of the incident beam Au+77 after it was stripped to Au+79

6 Increase in the beam emittance.The measured beam emittance of the Au+77 beam with no stripping is ~10 p[mm·mrad].

7 Nuclear Fragmentation of the incident beam Au+77 due to the interaction with the foil material.

tsoupas@bnl.gov