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in creator/contributor: "Belomestnykh, S."  
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Survey of SRF guns

Description: Developing Superconducting RF (SRF) electron guns is an active field with several laboratories working on different gun designs. While the first guns were based on elliptic cavity geometries, Quarter Wave Resonator (QWR) option is gaining popularity. QWRs are especially well suited for producing beams with high charge per bunch. In this talk we will describe recent progress in developing both types of SRF guns. SRF guns made excellent progress in the last two years. Several guns generated beams… more
Date: July 25, 2011
Creator: Belomestnykh, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Novel deflecting cavity design for eRHIC

Description: To prevent significant loss of the luminosity due to large crossing angle in the future ERL based Electron Ion Collider at BNL (eRHIC), there is a demand for crab cavities. In this article, we will present a novel design of the deflecting/crabbing 181 MHz superconducting RF cavity that will fulfil the requirements of eRHIC. The quarter-wave resonator structure of the new cavity possesses many advantages, such as compact size, high R{sub t}/Q, the absence of the same order mode and lower order m… more
Date: July 25, 2011
Creator: Wu, Q.; Belomestnykh, S. & Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design, simulation and conditioning of the fundamental power couplers for BNL SRF gun

Description: The 704 MHz SRF gun for the BNL Energy Recovery Linac (ERL) prototype uses two fundamental power couplers (FPCs) to deliver up to 1 MW of CW RF power to the half-cell cavity. To prepare the couplers for high-power RF service and process multipacting, the FPCs should be conditioned prior to installation into the gun cryomodule. A room-temperature test stand was configured for conditioning FPCs in full reflection regime with varied phase of the reflecting wave. The FPCs have been conditioned up t… more
Date: May 20, 2012
Creator: Xu, W.; Altinbas, Z.; Belomestnykh, S. & Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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HOM damping and multipacting analysis of the quarter-wave crab cavity

Description: The quarter-wave crab cavity design has been analyzed further to accommodate LHC requirements. The goal for the design is to provide strong deflecting voltage to the proton bunches at the IP, while keeping the effective length as short as possible. We will evaluate the higher order mode damping with two or four magnetic coupling dampers installed in different configuration. In this paper, we also show possible multipacting locations which are simulated by 2D and 3D codes.
Date: May 20, 2012
Creator: Wu, Q.; Belomestnykh, S.; Ben-Zvi, Ilan & Calaga, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of fundamental power coupler for high-current superconducting RF cavity

Description: Brookhaven National Laboratory took a project of developing a 704 MHz five-cell superconducting RF cavity for high-current linacs, including Energy Recovery Linac (ERL) for planned electron-hadron collider eRHIC. The cavity will be fed by a high-power RF amplifier using a coaxial Fundamental Power Coupler (FPC), which delivers 20 kW of CW RF power to the cavity. The design of FPC is one of the important aspects as one has to take into account the heat losses dissipated on the surface of the con… more
Date: May 20, 2012
Creator: Jain, P.; Belomestnykh, S.; Ben-Zvi, Ilan & Xu, W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Superconducting RF systems for eRHIC

Description: The proposed electron-hadron collider eRHIC will consist of a six-pass 30-GeV electron Energy Recovery Linac (ERL) and one of RHIC storage rings operating with energy up to 250 GeV. The collider design extensively utilizes superconducting RF (SRF) technology in both electron and hadron parts. This paper describes various SRF systems, their requirements and parameters.
Date: May 20, 2012
Creator: Belomestnykh, S.; Ben-Zvi, Ilan; Brutus, J. C. & Hahn, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SRF photoinjector for proof-of-principle experiment of coherent electron cooling at RHIC

Description: Coherent Electron Cooling (CEC) based on Free Electron Laser (FEL) amplifier promises to be a very good way to cool protons and ions at high energies. A proof of principle experiment to demonstrate cooling at 40 GeV/u is under construction at BNL. One of possible sources to provide sufficient quality electron beam for this experiment is a SRF photoinjector. In this paper we discuss design and simulated performance of the photoinjector based on existing 112 MHz SRF gun and newly designed single-… more
Date: May 20, 2012
Creator: Kayran, D.; Belomestnykh, S.; Ben-Zvi, Ilan & Brutus, J. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New HOM coupler design for high current SRF cavity

Description: Damping higher order modes (HOMs) significantly to avoid beam instability is a challenge for the high current Energy Recovery Linac-based eRHIC at BNL. To avoid the overheating effect and high tuning sensitivity, current, a new band-stop HOM coupler is being designed at BNL. The new HOM coupler has a bandwidth of tens of MHz to reject the fundamental mode, which will avoid overheating due to fundamental frequency shifting because of cooling down. In addition, the S21 parameter of the band-pass … more
Date: March 28, 2011
Creator: Xu, W.; Ben-Zvi, Ilan; Belomestnykh, S.; Hahn, H. & Johnson, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Wake fields effects for the eRHIC project

Description: An Energy Recovery Linac (ERL) with a high peak electron bunch current is proposed for the Electron-Ion collider (eRHIC) project at the Brookhaven National Laboratory. The present design is based on the multi-pass electron beam transport in existing tunnel of the Relativistic Heavy Ion Collider (RHIC). As a result of a high peak current and a very long beam transport, consideration of various collective beam dynamics effects becomes important. Here we summarize effects of the coherent synchrotr… more
Date: May 20, 2012
Creator: V., Fedotov A.; Belomestnykh, S.; Kayran, D.; Litvinenko, V. & Ptitsyn, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress on the high-current 704 MHz superconducting RF cavity at BNL

Description: The 704 MHz high current superconducting cavity has been designed with consideration of both performance of fundamental mode and damping of higher order modes. A copper prototype cavity was fabricated by AES and delivered to BNL. RF measurements were carried out on this prototype cavity, including fundamental pass-band and HOM spectrum measurements, HOM studies using bead-pull setup, prototyping of antenna-type HOM couplers. The measurements show that the cavity has very good damping for the hi… more
Date: May 20, 2012
Creator: Xu, W.; Astefanous, C.; Belomestnykh, S.; Ben-Zvi, Ilan & al, et
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of proof-of-principle experiment for coherent electron cooling

Description: Coherent electron cooling (CEC) has a potential to significantly boost luminosity of high-energy, high-intensity hadron colliders. To verify the concept we conduct proof-of-the-principle experiment at RHIC. In this paper, we describe the current experimental setup to be installed into 2 o'clock RHIC interaction regions. We present current design, status of equipment acquisition and estimates for the expected beam parameters. We use a dogleg to merge the electron and ion beams. The ions 'imprint… more
Date: May 20, 2012
Creator: Pinayev, I.; Belomestnykh, S.; Bengtsson, J.; Ben-Zvi, Ilan & Elizarov, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multipacting simulation and test results of BNL 704 MHz SRF gun

Description: The BNL 704MHz SRF gun has a grooved choke joint to support the photo-cathode. Due to the distortion of grooves at the choke joint during the BCP for the choke joint, several multipacting barriers showed up when it was tested with Nb cathode stalk at JLab. We built a setup to use the spare large grain SRF cavity to test and condition the multipacting at BNL with various power sources up to 50kW. The test is carried out in three stages: testing the cavity performance without cathode, testing the… more
Date: May 20, 2012
Creator: Xu, W.; Belomestnykh, S.; Ben-Zvi, Ilan & Cullen, C. et al
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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3D simulations of multipacting in the 56 MHz SRF cavity

Description: The 56 MHz SRF Quarter-Wave Resonator (QWR) is designed for RHIC as a storage cavity to improve the collider performance. 2D multipacting simulation has been done for the cavity alone. Ripples were added to the outer body of the cavity for multipacting suppression based on the simulation findings. During operation, there will be four higher order mode (HOM) couplers. All of these components will be exposed to high RF fields. In this paper we compare 2D and 3D codes simulation results for multip… more
Date: May 20, 2012
Creator: Q., Wu; Belomestnykh, S.; Ge, L.; Ko, K.; Li, Z.; Ng, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multipacting in a grooved choke joint at SRF gun for BNL ERL prototype

Description: The 703 MHz superconducting gun for BNL ERL prototype was tested at JLab with and without choke-joint and cathode stalk. Without choke-joint and cathode stalk, the gradient reached was 25 MV/m with Q{sup 0} {approx} 6E9. The gun cathode insertion port is equipped with a grooved choke joint for multipacting suppression. We carried out tests with choke-joint and cathode stalk. The test results show that there are at least two barriers at about 3.5 MV/m and 5 MV/m. We considered several possibilit… more
Date: March 28, 2011
Creator: Xu, W.; Ben-Zvi, Ilan; Belomestnykh, S.; Burrill, A.; Holmes, D.; Kayran, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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