Kamerdzhiev, V.

Paper	Title	Page
TUOCKI04	Experimental Demonstration of Beam-Beam Compensation by Tevatron Electron Lenses and Prospects for the LHC	728
	V. D. Shiltsev, Y. Alexahin, V. Kamerdzhiev, G. F. Kuznetsov, X. Zhang Fermilab, Batavia, Illinois K. Bishofberger LANL, Los Alamos, New Mexico
	We report the first experimental demonstration of compensation of beam-beam interaction effects with use of electron beams. Long-range and head-on interactions of high intensity proton and antiproton beams have been dominating sources of beam loss and lifetime limitations in the Tevatron in Collider Run II (2001-present). Electron lense acting on proton bunches has doubled their lifetime by compensating beam-beam interaction with antiprotons. We present results of the experiments, operational details and discuss possibilities of using electron lenses for beam-beam compensation in LHC.
	Slides
TUPAS024	Experimental and Simulation Studies of Beam-Beam Compensation with Tevatron Electron Lenses	1703
	V. Kamerdzhiev, Y. Alexahin, V. D. Shiltsev, A. Valishev, X. Zhang Fermilab, Batavia, Illinois D. N. Shatilov BINP SB RAS, Novosibirsk
	Initially the Tevatron Electron Lenses (TELs) were intended for compensation of the beam-beam effect on the antiproton beam. Owing to recent increase in the number of antiprotons and reduction in their emittance, it is the proton beam now that suffers most from the beam-beam effect. We present results of beam studies, compare them with the results of computer simulations using LIFETRAC code and discuss possibilities of further improvements of the Beam-Beam Compensation efficiency in the Tevatron.
TUPAS025	Commissioning of the Second Tevatron Electron Lens and Beam Study Results	1706
	V. Kamerdzhiev, R. J. Hively, G. F. Kuznetsov, H. Pfeffer, G. W. Saewert, V. D. Shiltsev, X. Zhang Fermilab, Batavia, Illinois
	In the framework of Fermilab's Beam-Beam Compensation project the second Tevatron Electron Lens (TEL2) has been installed in the Tevatron during Spring 2006 shutdown. After successful commissioning a series of beam studies has been carried out in single bunch mode. The paper describes the commissioning process and first beam studies results.
WEPMN097	A Solid State Marx Generator for TEL2	2257
	V. Kamerdzhiev, H. Pfeffer, G. W. Saewert, V. D. Shiltsev, D. Wolff Fermilab, Batavia, Illinois
	The solid-state Marx generator modulates the anode of the electron gun to produce the electron beam pulses in the second Tevatron Electron Lens (TEL2). It is capable of driving the 60 pf terminal with 600ns pulses of up to 6 kV with a p.r.r. of 50 kHz. The rise and fall times are 150 ns. Stangenes Industries developed the unit and is working on a second version which will go to higher voltage and have the ability to vary its output in 396 ns intervals over a 5 us pulse.
FRPMS007	Status of the FNAL Digital Tune Monitor	3877
	J.-P. Carneiro, V. Kamerdzhiev, A. Semenov, R. C. Webber Fermilab, Batavia, Illinois
	We have implemented a real-time method for betatron tune measurements from each bunch at Tevatron based on 16bit 100MHz ADC. To increase the betatron signal level from pick-up we have used a modified version Direct Diode Detection method combined with fast FPGA algorithm and 14 bit DAC for suppression of low frequency beam motion and noise background before final amplifying stage. A descritpion of this devise will be presented in the paper together with first results.