ERL2015 - List of Authors (Gassner, D.M.)

Paper

Title

Page

Status and Commissioning Results of the R&D ERL at BNL

10

D. Kayran, Z. Altinbas, D.R. Beavis, S.A. Belomestnykh, I. Ben-Zvi, S. Deonarine, D.M. Gassner, R.C. Gupta, H. Hahn, L.R. Hammons, C. Ho, J.P. Jamilkowski, P. K. Kankiya, N. Laloudakis, R.F. Lambiase, V. Litvinenko, G.J. Mahler, L. Masi, G.T. McIntyre, T.A. Miller, J. Morris, D. Phillips, V. Ptitsyn, T. Rao, T. Seda, B. Sheehy, L. Smart, K.S. Smith, T. Srinivasan-Rao, A.N. Steszyn, R. Than, E. Wang, D. Weiss, H. Xie, W. Xu, A. Zaltsman
BNL, Upton, Long Island, New York, USA
S.A. Belomestnykh, I. Ben-Zvi, L.R. Hammons, D. Kayran, V. Litvinenko, V. Ptitsyn
Stony Brook University, Stony Brook, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is presently under commissioning at Brookhaven National Laboratory (BNL) for testing of concepts relevant for high-energy coherent electron cooling and electron-ion colliders. The injector subsystems tests and installation were finished in fall 2013. The injector includes: SRF photoelectron gun with 1 MW amplifier, 10W green drive-laser system, multi-alkaline cathode deposition system, cathode transport system, beam instrumentation and control. * The first photo current from ERL SRF gun has been observed in fall 2014 after second attempt. Completion of the ERL returning loop components installation is scheduled for April 2015 following full power ERL commissioning. After ERL commissioning in BLDG912 the ERL will be relocated to RHIC IP2 to be used as low energy RHIC electron cooler.
* D.Kayran et al., First test results from SRF photoinjector for the R&D ERL at BNL, IPAC'14, pp. 748-750

Slides MOPDTH014 [13.777 MB]

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TUIBLH1023

The Progress of Funneling Gun for eRHIC Injector

E. Wang, I. Ben-Zvi, D.M. Gassner, R.F. Lambiase, W. Meng, T. Rao, B. Sheehy, J. Skaritka
BNL, Upton, Long Island, New York, USA
M.A. Ackeret, J.R. Pietz
Transfer Engineering and Manufacturing, Inc, Fremont, California, USA
E. Dobrin, R.C. Miller, K.A. Thompson, C. Yeckel
Stangenes Industries, Palo Alto, California, USA
O.H. Rahman
Stony Brook University, Stony Brook, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A prototype of the high average current polarized electron funneling gun as ERL-FFAG based eRHIC injector has built at BNL. In last year, we generated two beams from GaAs photocathodes by CW green laser and combined by a switched combiner field. We observed the combined beams on a YAG crystal ,measured the photocurrent and cathode lifetime by a Faraday cup. In this paper, we will describe the major components of the gun and beam line optics. We will also discuss the recent beam test results and high voltage conditioning results.

Slides TUIBLH1023 [10.603 MB]

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WEIALH2048

Current Measurement and Associated Machine Protection in the ERL at BNL

52

T.A. Miller, D.M. Gassner, J.P. Jamilkowski, D. Kayran, M.G. Minty, J. Morris, B. Sheehy
BNL, Upton, Long Island, New York, USA

The R & D Energy Recovery Linac (ERL) at Brookhaven National Laboratory requires accurate and precise current measurements for logging and for machine protection. In this paper we present the techniques used to derive the beam current from the beam charge measurement taken using an integrating current transformer (ICT). The strategy for ramping up the total beam current is discussed, - including the motivation for developing different operating modes with specific pulse structures, taking into account the constraints on the pulse structure imposed by the operating limits of the ICT during initial accelerator commissioning. The electronics packages used for integration and digitization are presented along with methods of synchronization. Finally, results of measurements during the first beam tests are presented.

Slides WEIALH2048 [21.604 MB]

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Paper	Title	Page
MOPDTH014	Status and Commissioning Results of the R&D ERL at BNL	10
	D. Kayran, Z. Altinbas, D.R. Beavis, S.A. Belomestnykh, I. Ben-Zvi, S. Deonarine, D.M. Gassner, R.C. Gupta, H. Hahn, L.R. Hammons, C. Ho, J.P. Jamilkowski, P. K. Kankiya, N. Laloudakis, R.F. Lambiase, V. Litvinenko, G.J. Mahler, L. Masi, G.T. McIntyre, T.A. Miller, J. Morris, D. Phillips, V. Ptitsyn, T. Rao, T. Seda, B. Sheehy, L. Smart, K.S. Smith, T. Srinivasan-Rao, A.N. Steszyn, R. Than, E. Wang, D. Weiss, H. Xie, W. Xu, A. Zaltsman BNL, Upton, Long Island, New York, USA S.A. Belomestnykh, I. Ben-Zvi, L.R. Hammons, D. Kayran, V. Litvinenko, V. Ptitsyn Stony Brook University, Stony Brook, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is presently under commissioning at Brookhaven National Laboratory (BNL) for testing of concepts relevant for high-energy coherent electron cooling and electron-ion colliders. The injector subsystems tests and installation were finished in fall 2013. The injector includes: SRF photoelectron gun with 1 MW amplifier, 10W green drive-laser system, multi-alkaline cathode deposition system, cathode transport system, beam instrumentation and control. * The first photo current from ERL SRF gun has been observed in fall 2014 after second attempt. Completion of the ERL returning loop components installation is scheduled for April 2015 following full power ERL commissioning. After ERL commissioning in BLDG912 the ERL will be relocated to RHIC IP2 to be used as low energy RHIC electron cooler. * D.Kayran et al., First test results from SRF photoinjector for the R&D ERL at BNL, IPAC'14, pp. 748-750
	Slides MOPDTH014 [13.777 MB]
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TUIBLH1023	The Progress of Funneling Gun for eRHIC Injector
	E. Wang, I. Ben-Zvi, D.M. Gassner, R.F. Lambiase, W. Meng, T. Rao, B. Sheehy, J. Skaritka BNL, Upton, Long Island, New York, USA M.A. Ackeret, J.R. Pietz Transfer Engineering and Manufacturing, Inc, Fremont, California, USA E. Dobrin, R.C. Miller, K.A. Thompson, C. Yeckel Stangenes Industries, Palo Alto, California, USA O.H. Rahman Stony Brook University, Stony Brook, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A prototype of the high average current polarized electron funneling gun as ERL-FFAG based eRHIC injector has built at BNL. In last year, we generated two beams from GaAs photocathodes by CW green laser and combined by a switched combiner field. We observed the combined beams on a YAG crystal ,measured the photocurrent and cathode lifetime by a Faraday cup. In this paper, we will describe the major components of the gun and beam line optics. We will also discuss the recent beam test results and high voltage conditioning results.
	Slides TUIBLH1023 [10.603 MB]
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WEIALH2048	Current Measurement and Associated Machine Protection in the ERL at BNL	52
	T.A. Miller, D.M. Gassner, J.P. Jamilkowski, D. Kayran, M.G. Minty, J. Morris, B. Sheehy BNL, Upton, Long Island, New York, USA
	The R & D Energy Recovery Linac (ERL) at Brookhaven National Laboratory requires accurate and precise current measurements for logging and for machine protection. In this paper we present the techniques used to derive the beam current from the beam charge measurement taken using an integrating current transformer (ICT). The strategy for ramping up the total beam current is discussed, - including the motivation for developing different operating modes with specific pulse structures, taking into account the constraints on the pulse structure imposed by the operating limits of the ICT during initial accelerator commissioning. The electronics packages used for integration and digitization are presented along with methods of synchronization. Finally, results of measurements during the first beam tests are presented.
	Slides WEIALH2048 [21.604 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)