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Gaussian TEL gun progress

Gaussian TEL gun progress. V. Kamerdzhiev, G. Kuznetsov, V. Shiltsev. LARP Collaboration Meeting 10 Danfords on the Sound, Port Jefferson, NY, April 23-25, 2008. The e-gun design.

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Gaussian TEL gun progress

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  1. Gaussian TEL gun progress V. Kamerdzhiev, G. Kuznetsov, V. Shiltsev LARP Collaboration Meeting 10Danfords on the Sound, Port Jefferson, NY, April 23-25, 2008

  2. The e-gun design The electrode geometry is optimized for generating Gaussian-like transverse current density distributions (profiles) using SuperSam/UltraSam code* control electrode (CE) anode cathode * M. Tiunov, INP Novosibirsk, Russia Gaussian TEL gun progress

  3. The electron gun assembled on a 6 ¾ conflat flange Gaussian TEL gun progress

  4. The test bench gun solenoid main solenoid collector solenoid Gaussian TEL gun progress

  5. Profile measurement technique the deflector current is ramped in small steps at every step the probe current is recorded I = const Gaussian TEL gun progress

  6. Electron beam analyzer ADC PC 0.2 mm hole the current probe Gaussian TEL gun progress

  7. 3D current density distribution @ 8kV Gaussian TEL gun progress

  8. Profiles vs Uce @ Ucath= 5kV Gaussian TEL gun progress

  9. Maximum ratings Ucath = -10kV; Uanode = Ucath, Gnd; Ipeakmax = 1.65A; @ Bgun = 4kG; 5*10-9 Torr The rise/fall time is defined by the driver circuit. Applying positive voltage to the CE in respect to the cathode will result in higher peak electron current Gaussian TEL gun progress

  10. Summary • The Gaussian electron gun was successfully tested on the test bench at up to 10kV • What to do next • install the Gaussian e-gun in one of the TELs • since the e-p beam alignment is very critical we need to figure out the best way to achieve/maintain optimum e-p alignment • the Digital Tune Monitor seems to be the best candidate capable of detecting the tune spread change (work in progress) Gaussian TEL gun progress

  11. Backup slides • proposed hollow electron beam for LHC collimation system • e-gun simulations are performed using UltraSam code • simulations done by L. Vorobiev • mechanical considerations by G. Kuznetsov • goals • keep the transverse electron energy low • extract as much current as possible • simulate e-beam compression in solenoidal magnetic field Gaussian TEL gun progress

  12. Hollow e-beam for LHC collimation system current density distribution (profile) control electrode anode cathode near cathode electrode cylindrical symmetry Gaussian TEL gun progress

  13. Example 2 Gaussian TEL gun progress

  14. Example 3 Gaussian TEL gun progress

  15. Simulated profile comparison the proton beam passes through the zero e-current area Gaussian TEL gun progress

  16. Summary • the “hollow” gun can be simulated with the tools we have (Super/Ultra SAM) • first look shows promising results • mechanical design looks doable • the infrastructure for testing the gun (once it’s been built) is available • we plan to continue the development and demonstrate the detailed design Gaussian TEL gun progress

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