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Introduction to the Gatling Gun Development Program

Introduction to the Gatling Gun Development Program. Report to the Gatling Gun Review Committee By John Skaritka June, 28, 2012. Talk outline . Program Motivation Gatling Gun C oncept S chematic and S ystem Layouts Gun P arameters list Goals and challenges of the Phase 1 R&D

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Introduction to the Gatling Gun Development Program

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  1. Introduction to the Gatling Gun Development Program Report to the Gatling Gun Review Committee By John Skaritka June, 28, 2012 Gatling gun program review, June 28th-29th, 2012

  2. Talk outline Gatling gun program review, June 28th-29th, 2012 Program Motivation Gatling Gun Concept Schematic and System Layouts Gun Parameters list Goals and challenges of the Phase 1 R&D Scope of the short term R&D program 2010-2012 Layout of G-Gun Lab in 905 Schedule 2012 -2013 feasibility studies Summary and Acknowledgments

  3. Motivation Gatling gun program review, June 28th-29th, 2012 • This is a Laboratory Directed Research and Development (LDRD) project. • The motivation is to develop a high-current polarized electron gun aimed at e-RHIC, where the requirement is 50 mA average current. • The specific approach is to use funneling of beams from multiple cathodes in order to increase the (current * lifetime) product of the gun. • The goal of the LDRD project is to demonstrate that funneling works. To be specific: • A reasonable current and lifetime achieved with one cathode. • The addition of a second cathode does not degrade the performance of the first and thus doubles the current*lifetime product of the device. • A separate LDRD project is devoted to the development of the laser driver.

  4. Motivation continued Gatling gun program review, June 28th-29th, 2012 This program is complementary to high-current polarized gun R&D at Jefferson Laboratory and at MIT, i.e. advances in each of the programs lead to a combined improvement in the e-RHIC polarized injector. This LDRD program is one of the “highest priority” items as set by EICAC. It is complementary to high-current sources R&D at Jlab and MIT, if successful it can serve as a multiplier to developments by others. It is a unique, new approach toward enhancing current capability in polarized electron sources. If successful the Gatling Gun may be used as a polarized electron source for the proposed e-RHIC machine.

  5. “Gatling Gun” concept 2 to 20 Photo-cathodes arranged in a ring Target photo current to be 2.5 mA / cathode, beam current to be > 50 mA @ 200 kV Gatling gun 3rd harmonic cavity Bunching cavity (112 MHz) Fixed bend magnets Ballistic compression Booster linac 30 deg 16 cm 200 kV electron beam Combiner, 704 kHz rotating dipole and quadrupole fields G-Gun Laser System (two shown) Gatling gun program review, June 28th-29th, 2012

  6. How the Gatling Gun may appear in e-RHIC Pair of Gatling guns Ballistic compression Bunching cavity (112 MHz) RHIC Ion beam line e- RHIC superconducting RF cavities Depicted in the 2 o’clock hall of the RHIC tunnel Gatling gun program review, June 28th-29th, 2012

  7. Gatling Gun System Layout Fresh Cathode Load Lock Gun Laser System table, (Laser Lab not Shown) Cathode Regeneration Forest 250 KV Feed through Extreme vacuum chamber Cathode Prep.Chamber ( Grand Central ) Cathode Transport Line Cathode Exchange Chamber Gatling gun program review, June 28th-29th, 2012

  8. Layout of Phase 1 Gatling Gun Developmental System High Voltage Feed through Depressed Collector Cathode Exchange Chamber Combiner Magnet Cathode array injector Beam Diagnostic section Main gun chamber Transition Section Gatling gun program review, June 28th-29th, 2012

  9. Cathode preparation system (Grand Central) Atomic hydrogen gun Manipulator to move cathodes between train and prep trees Cathodes Preparation Trees Assy. System to deposit Cs on the cathode Cathode service flange assembly to heat, cool and apply O2 22 cathode train cathode module Gatling gun program review, June 28th-29th, 2012

  10. Sectioned View of the Gatling Gun shows the cathode train from the Cathode Prep. Chamber (upper left) arriving in the Cathode Exchange Chamber(lower right). A manipulator transfers the individual cathode modules from the train to the cathode magazine to be is injected into the 20 Cathode Shroud (revolver assy.). Cathode Prep. Chamber 20 Cathode Shroud(Revolver) Injectable Cathode Magazine Cathode Module Manipulator Cathode Train Cathode Exchange Chamber(CEC) path of motion Gatling gun program review, June 28th-29th, 2012

  11. Cathode, Anode G-Gun Component design Titanium Anode Focusing Solenoid 1st Bend Dipole Stainless steel Cathode Shroud < 250KV Cathode Module Cathode cooling ring 4W, 780 nm Laser Beam Titanium conformer Molybdenum cathode base Gallium Arsenide Cathode • 2.5 mA. • Electron Beam Extreme Vacuum Cathode Ring NEG pump Gatling gun program review, June 28th-29th, 2012

  12. Two Beam Combiner operation and diagnostics The Combiner design will be presented by Erdong Wang and Diagnostics will be presented by David Gassner later today. Gatling gun program review, June 28th-29th, 2012

  13. R&D Gatling Gun Parameters List Page 1 Gatling gun program review, June 28th-29th, 2012

  14. R&D Gatling Gun Parameter List Page 2 Gatling gun program review, June 28th-29th, 2012

  15. R&D Gatling Gun Parameter List Page 3 Gatling gun program review, June 28th-29th, 2012

  16. Specific Goals of Phase 1 R&D Gatling gun program review, June 28th-29th, 2012 • Demonstrate multi-cathode Gun operation • Determine a practical minimum current per cathode • Establish production of GaAs G-Gun Cathodes • Determine practical cathode Life • Determine potential cathode production through put.

  17. Technical challenges of the R&D program Gatling gun program review, June 28th-29th, 2012 • Demonstrate Prerequisite XHV properties in large Gun Chambers manufactured in industry • Demonstrate operation of system components • Multi Cathode Drive laser system • Rotating field of a combiner magnet • A practical XHV valve

  18. Single Cathode Preparation system The first piece of Gatling Gun equipment, the single cathode preparation system has arrived at BNL and is under bake out and testing in building 966. single Gatling gun cathode module Eric Riehn will be describing the system in his up coming talk and showing the system during a tour later today Gatling gun program review, June 28th-29th, 2012

  19. Phase 1 G-Gun module Layout 250 KV, supply Gatling Gun High Voltage Line Combiner Supply Depressed Collector Gun Laser optics Vertical Bread Board Gatling gun program review, June 28th-29th, 2012

  20. Layout of Gatling Gun Lab. in building 905 Clean Room Phase 1 Gatling Gun Module Gatling Gun Laser Lab Portable cranes Aluminum HV containment Room Multi-Cathode preparation system Gatling gun program review, June 28th-29th, 2012

  21. Schedule Milestones for 2012-13 Gatling gun program review, June 28th-29th, 2012 Grand Central Vessel vacuum Spec achieved……..……..……….3/2012 Single Cathode Prep system delivery and setup…………………6/2012 Gatling Gun vacuum system components completed …….....9/2012 1560 nm laser operation at BNL………………………………………….9/2012 Grand Central manipulators integrated and XHV tested……10/2012 Cathode Shroud system and Anode Assembly completed…12/2012 Gatling Gun vacuum system integrated and XHV tested……..2/2013 780 nm doubling operation ……………………………………………….2/2013 HV testing of completed Gatling Gun……………………….…….… 3/2013 Gun Cathodes routinely produced in single prep system......4/2013 Laser Lab and gun room assembled in building 905 …………..5/2013 Phase 1 Combiner magnet completed……………………………...6/ 2013 Depressed collector assembled and tested………………………..7/2013 Diagnostics assembled and tested……………………………………..9/2013 Combiner power supply assembled and tested ………………..10/2013 High voltage supply system assembled and tested…………….11/2013 Gun beam line assembled in 905……………………………..………..12/2013

  22. Longer term Milestones, 2014-15 Prototype Development • Gun vacuum system pump down and bake out…………………………….........1/2014 • Gun system at XHV and system testing commences………..…………………..2/2014 • One and two Cathode operation start………….……………………………….......3/2014 • Grand Central (GC) Trees produced and integrated……..……………….……..4/2014 • Multi -laser and Cathode Gun operation start.………………....................…6/2014 • Cathode Prep chamber with Multi-cathode operation………………….......7/2014 • GC Multi-Cathode production start…………………………………..………………...8/2014 • Transport line system between GC and Gun chambers.………...............10/2014 • Gatling Gun, transport and GC systems fully XHV integrated…………….11/2014 • Phase 2 Combiner 700KHz tested and installed………….……. ……………... 2/2015 • Gatling Gun full system operating under full test conditions………..……...4/2015 • Full system performance , cathode life and throughput measured……...9/2015 Gatling gun program review, June 28th-29th, 2012

  23. Summary Gatling gun program review, June 28th-29th, 2012 • Presented is an introduction of the Gatling Gun Development Program. • The R&D Goals and Challenges have been presented. • The design and operation of the Prototype Gatling Gun and Cathode Prep system was presented. • The single Cathode preparation system completed and under test at BNL. • Progress is being made on the Gatling Gun vessel components in industry. • Schedule milestones that define the program have been presented that if adequately supported will fully demonstrate and categorize the Gatling Gun system for use as a practical source for an ERL by the Fall of 2015.

  24. Acknowledgments Gatling gun program review, June 28th-29th, 2012 I. Ben-Zvi, J.C. Brutus, D. Gassner, B. Lambiase, V. Litvinenko, P. Manning D. Pate, A. Pikin, T. Rao, O. Rahman, E. Riehn, T. SedaB. Sheehy, E. Wang, Q. Wu, As well as the management and staff at the following firms, MDC Corporation, Transfer Engineering Inc., Atlas Technologies, SAES Getters, Thermionics, Pascal Technologies, Gamma Vacuum, Stangenes Industries

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