Polarized source upgrade. Source upgrade project -2010-12. Main component delivery: Atomic Beam Source- August 2011 Superconducting solenoid- March-2012.

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Presentation transcript:

Polarized source upgrade. Source upgrade project Main component delivery: Atomic Beam Source- August 2011 Superconducting solenoid- March-2012 The development is not completed, but the new source delivers better quality beam in this Run-13. Time meeting, June4

Operational Polarized H - Source at RHIC. RHIC OPPIS produces reliably mA polarized H - ion current. Polarization at 200 MeV: P = 80%. Beam intensity (ion/pulse) routine operation: Source H - /pulse Linac - 5∙10 11 AGS ∙ RHIC - 1.5∙10 11 (protons/bunch). A 29.2 GHz ECR-type source is used for primary proton beam generation. The source was originally developed for dc operation. A ten-fold intensity increase was demonstrated in a pulsed operation by using a very high-brightness Fast Atomic Beam Source instead of the ECR proton source.

Pulsed OPPIS with the atomic hydrogen injector at INR, Moscow, Atomic H injector Helium ionizer cell ~80% ionization efficiency. Lamb-shift polarimeter H - current 0.4mA, P=65%

OPPIS with atomic H injector layout. Atomic H injector Neutralizer cell He-ionizer cell Rb-cell Na-jet cell H+H+ H0H0 H+H+ H0H0 H-H- H2 HeRbNa TMP1 CP1

A result of this “upgrade” is practically a new source. A new superconducting solenoid. A new atomic hydrogen injector. A new vacuum system. A new H-ionizer cell, energy separation system and pulsed PS system. A new control and interlock system. Major upgrades of laser system. Major modifications of the Low Energy Beam Transport system. Major upgrades in 200 MeV polarimeter. A new test-bench for atomic injector studies. Many other upgrades…

“Fast Atomic Beam Source”, BINP 2011 Plasmatron 4-grid proton extraction system H2 Neutralization cell ~ 3.5 A equivalent H 0 beam FABS produces mA equivalent H0 beam intensity Within the Na-jet ionizer acceptance.

He-ionizer cell and three-grid energy separation system. He-pulsed valve 3-grid beam deceleration system

New PLC interlock and monitoring system. Graphics by Yuri Bezpalko

Source intensity and polarization. Rb-cell, Temp., deg. C Linac Current, μA Booster Input × Pol. %, at 200 MeV Reliable long-term ∙operation of the source was demonstrated. Very high suppression of un-polarized beam component was demonstrated. Small beam emittance (after collimation for energy separation) and high transmission to 200 MeV.

Rb-81, T9-current-295 uA (4.9*10^11) 83.9+/0.9% 84.2+/-0.5%

Polarization measurements at 200 MeV, March %

200 MeV polarization in Run-2012, high intensity operation 80%

Summary The new source is working. Reliable long-term operation at steady current and polarization. The maintenance time is significantly reduced. Polarization is on average about 3% higher then ECR-based source. It is expected that polarization can be further improved to over 85%. The source intensity is about 5-10 mA. Due to strong space- charge effects only fraction of this current is transported and accelerated in RFQ and Linac. These losses can be reduced.