Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11...
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Transcript of Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11...
![Page 1: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/1.jpg)
Polarized source upgrade
RSC, January 11, 2013
![Page 2: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/2.jpg)
OPPIS
LINAC
Booster
AGS
RHIC
(2.0-2.2) 10∙ 11 p/bunch
0.6mA x 300us→11 10∙ 11 polarized H- /pulse.
(6.0-6.5) 10∙ 11 polarized H- /pulse at 200 MeV
(2.2-2.4) 10∙ 11 protons /pulse at 2.3 GeV
~1.8∙1011 p/bunch, P~60-65% at 100 GeV P ~ 56% at 250 GeV
RHIC Polarized beam in Run 2012
![Page 3: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/3.jpg)
OPPIS with neutral H injector layout.
Atomic H injector
Neutralizer cell
He-ionizercell Rb-cell
Na-jetcell
H+ H0 H+ H0 H-H2 He Rb Na
TMP1CP1
![Page 4: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/4.jpg)
The FABS and new SCS at operational OPPIS bench.
![Page 5: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/5.jpg)
The FABS and new SCS at operational OPPIS bench
![Page 6: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/6.jpg)
“Fast Atomic Beam Source”, BINP 2011
Plasmatron 4-grid protonextraction system
H2 Neutralization cell
~ 3.5 AequivalentH0 beam
FABS produces 200-300 mA equivalent H0 beam intensityWithin the Na-jet ionizer acceptance.
![Page 7: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/7.jpg)
Residual un-polarized H0 beam component suppression by the energy separation.
H+(70%)
H0(7 keV)
H0(3.0keV)
-4.0 kV-4.1 kV -4.1 kV
H0(7.0keV)
He-ionizer cell Rb -cell
H0(30%)
DecelerationH0 + He → H+ + He + e
-2-3 kV +0.1kV
![Page 8: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/8.jpg)
Polarization dilution in the FABS.
H0 (7 keV)
H+ (7 keV)
H+ (3.0keV)
H0 (3.0keV)
H- (3.0keV)
H- (35keV)
Ionization in He-cell~70%
Neutralization in Rb, ~70%
Na-jet, 8.0%
Polarized ~ 4.0 %
H0(7 keV) H-(7 keV) H-(39 keV)40% 2%
H+ (7 keV)H2-cell
0.8 / 4.0 ~ 20% - polarization dilution.4.0 keV energy separation would allow dilution reduction to less than 0.5%.
Losses at Deceleration, ΔE = - 4.0 keV, ???
Acceleration - 32 keV
95%
Un-polarized ~ 0.8 %
![Page 9: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/9.jpg)
He-ionizer cell assembly with electro-dynamic valve and proton deceleration system.
Electro-dynamic valve
Three-gridEnergy-separationsystem
![Page 10: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/10.jpg)
He-ionizer cell assembly with electro-dynamic valve and proton deceleration system.
Grid heater to reduce Rb deposition
![Page 11: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/11.jpg)
Electro-dynamic valve operation principle.
Electro-dynamic valve .
Force to the conducting plate in the (high ~ 3 T) magnetic field.
For I=100 A, L=5 cm, F=15 N).
![Page 12: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/12.jpg)
Electro-dynamic valve.
1 – body, 2 – current vacuum feed-through, 3 – gas supply, 4 – flexible springing plate, 5 – “O” -ring.
![Page 13: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/13.jpg)
Changes in the Low Energy Beam Transport Line.
EL2-replaced with the Quad doublet
Variable collimatorIn DB2 to improveEnergy resolution.
New FC
The LEBT is tuned for 35 keV beamEnergy transport.
![Page 14: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/14.jpg)
Energy separation of decelerated (“polarized”) H- ion beam in LEBT.
0
0.5
1
1.5
2
2.5
3
3.5
20 22 24 26 28 30 32 34 36
Acceleration voltage, kV
H- i
on b
eam
cur
rent
, m
A31.5 + (7.5 – 4.0) = 35 keV
I (He-”on”)/ I(He –”off”) ~50
![Page 15: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/15.jpg)
535 uA in FC after RFQ, Rb-91 deg. I=200 A
![Page 16: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/16.jpg)
Energy separated beam vs. Rb –cell temperature
0
200
400
600
800
1000
1200
1400
1600
0 20 40 60 80 100 120 140
T Rb, C
FC4,
mkA
30 uA- He-off
1400 uA- He-cell“on”
31.5 + (7.5-4.0)= 35 keVE0 =7.5 keV ΔE=4.0 kV
FC4, uA
![Page 17: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/17.jpg)
Beam production and transport vs. Rb-temperature at different primary beam intensities.
![Page 18: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/18.jpg)
Rb-91 deg, T9-current-525 uA, I=200A
![Page 19: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/19.jpg)
T9-current-600 uA, Rb-96 deg, I=200 A,
![Page 20: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/20.jpg)
Superconducting Solenoid Sona transition
Ionizersolenoid
LargeCorrectionCoil
OPPIS magnetic field, Sona-transition field shape control.
InternalCorrection Coils
![Page 21: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/21.jpg)
Higher residual field with the new solenoid. Use of iron shield and four correction coils allowed of field
gradients control to the required level.Still there is a room for improvements.
80 %
![Page 22: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/22.jpg)
Laser system upgrade. New wavelength meter.
![Page 23: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/23.jpg)
Optical pumping of Rb-85 (72.7%), Rb-87(27.8%) natural
mixture..Effective width of Rb 85-87 natural mixture including hyperfine Splitting and Doppler broadening is ~ 3.2 GHz
Δν ~ 8 GHz
![Page 24: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/24.jpg)
Laser frequency scan. 200 MeV polarization vs. laser frequency.
~ 12 GHz
Spin “up”
![Page 25: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/25.jpg)
Spin “down”
![Page 26: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/26.jpg)
Dec.16, T9-current 220 uA, Pol-78.7+/-0.7%
![Page 27: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/27.jpg)
Polarization vs. Rb –temperature.
90 deg
80 %
![Page 28: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/28.jpg)
Polarization measurements in Lamb-shift polarimeter.
Rb-cell vapor thickness
![Page 29: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/29.jpg)
OPPIS current and polarization vs. Rb –cell vapor thickness.
5∙1013
Rb-cell thickness, atoms/cm^2
X 1013
Higher ~105 deg Rb cell temperature
![Page 30: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/30.jpg)
Recent progress.• The new solenoid works well.• Both atomic H sources are in operation. Plasmatron operation is quite
stable and reliable. • High –intensity H- ion beam production, acceleration to 35 keV,
transportation in LEBT were studied.• 4 mA H- ion beam was obtained out of Linac.• He-ionizer cell works well with a new pulsed magneto-dynamic He gas
valve. • Reliable deceleration of proton beam was demonstrated.• Very good beam energy separation (Suppression of the “wrong” energy
un-polarized beam component) was demonstrated.• A 600-800 uA energy separated H- ion beam was produced for injection to
RFQ. • Beam polarization measurement are in progress in 200 MeV polarimeter.• 75-80 % polarization was obtained so far.
![Page 31: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/31.jpg)
Recent tests at 200 MeV.
• Goals:• Reliability studies.• Polarization and intensity optimization.• MCR operator training.
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Reliable operation
Intensity
Polarization
![Page 33: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/33.jpg)
Results so far.
• Reliable long-term ∙operation of the source was demonstrated.• Very good suppression of un-polarized beam component was demonstrated.• Small beam emittance (after collimation for energy separation) and high
transmission to 200 MeV.• 500-600 uA beam intensity was obtained at 200 MeV (9.0-10.8) ∙1011 H-/pulse at Rb –vapor thicknes ~6 ∙10 13 atoms/cm2, (90 deg. cell temperature).~ 78-80% polarization was measured in 200 MeV polarimeter at beam intensity
200-250 uA.~ 80-82% polarization at 150 uA.~ 74-76% at intensity 300-500 uA. After a new set of magnetic field measurements the Rb-cell position was moved ~ 100 mm upstream in a field flattop part. Hopefully, it will improve
polarization.
![Page 34: Polarized source upgrade RSC, January 11, 2013. OPPIS LINAC Booster AGS RHIC (2.0-2.2) ∙10 11 p/bunch 0.6mA x 300us11∙10 11 polarized H - /pulse. (6.0-6.5)](https://reader036.fdocuments.in/reader036/viewer/2022062600/5a4d1b837f8b9ab0599bbc70/html5/thumbnails/34.jpg)
Summary
It looks like the source reliability is acceptable for the use in the RHIC Run 13.
The beam intensity and polarization is comparable with the best ECR-based OPPIS operation.
Beam intensity of ~10 ∙1011 was obtained (Booster input).
Polarization measurements and optimization will be continued. There is a room for improvements.
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LINAC (T9) H- beam current 4.0 mA at 200 MeVE inj = 4 + 31 kV=35 keV, May 14, 2012.
4.0/0.03 ~33 Suppressionfactor for Un-polarized beam component
4.0 mA
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Linac current vs. Rb vapor thickness.
400 uA at 200 MeV7.4∙1011 H- /pulseat Rb thickness13∙1013 Rb/cm2
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Ratio of the target to the emitter current density vs spherical grids focal length.
Fig. 8. Ratio of the target current to the emitter current vs focal distance: 1 – without magnetic field, 2 – with magnetic field.
5A, H+ → 200mA, H0→ 16 mA, H-