Scientific Commons: H. Padamsee

200MHz superconducting RF cavity development for RLAs 1 (2008)

R. L. Geng, H. Padamsee, D. Hartill, P. Barnes, J. Sears, R. Losito, ...

Abstract. A 200MHz single-cell superconducting Nb-Cu cavity has been fabricated and tested at 4.2 K and at 2.5 K. The low field Q0 reached 1:5 10 10 at 4.2 K. The accelerating gradient (Eacc) reached...

PROGRESS OF 2-CELL CAVITY FABRICATION FOR (2008)

Cornell Erl Injector, R. L. Geng, P. Barnes, M. Liepe, V. Medjidzade, H. Padamsee, ...

absorbers are fitted between cavities to damp HOM’s. A sketch layout of the five injector cavities, symmetric twin input couplers, and HOM absorbers is shown in Fig. 1. Five 1300 MHz...

Beam Test of a Superconducting Cavity for the CESR Luminosity Upgrade* (2008)

H. Padamsee, P. Barnes, S. Belomestnykh, K. Berkelman, M. Billing, R. Ehrlich, ...

The prototype superconducting cavity system for CESR-Phase III was tested in CESR in August 1994. The performance of the system was very gratifying. The cavity operated gradients of 4.5-6 MV/m and...

Improvements in Field Emission: An Updated Statistical Model for Electropolished Baked Cavities. (2008)

J. Wiener, DESY Maschinenphysik, H. Padamsee

Internal report | Preprint

Final Surface Preparation for Superconducting Cavities - An Attempt to Describe an Optimized Procedure. (2008)

G. Ciovati, DESY Maschinenphysik, T. Higo, P. Kneisel, J. Mammosser, A. Matheisen, ...

Internal report | Preprint

Magnetic Field Enhancement at Pits and Bumps on the Surface of Superconducting Cavities. (2008)

H. Padamsee, DESY Maschinenphysik, V. Shemelin

Internal report | Preprint

Thermal and Statistical Models for Quench in Superconducting Cavities. (2008)

J. Wiener, DESY Maschinenphysik, H. Padamsee

Internal report | Preprint

Beam Test of a Superconducting Cavity for the CESR Luminosity Upgrade (2007)

H. Padamsee, P. Barnes, S. Belomestnykh, K. Berkelman, M. Billing, R. Ehrlich, ...

The prototype superconducting cavity system for CESRPhase

Mirco-Structures of RF Surfaces in the Electron-Beam-Weld Regions of Niobium (2007)

R.L. Geng, J. Knobloch, H. Padamsee

Micro-structures of RF surfaces in the electron-beam-weld (EBW) regions of niobium samples were studied. These surfaces were polished with different techniques, namely buffered chemical polish (1:1:2...

Microscopic examination of defects located by thermometry in 1.5 GHz superconducting niobium cavities (2007)

J. Knobloch, R. Durand, H. Muller, H. Padamsee

A new high resolution, high speed thermometry system has been built at Cornell to permit the study of anomalous loss regions in 1.5 GHz superconducting Nb cavities in superfluid He. Following a...

High Power Window Tests on a 500 MHz Planar Waveguide Window for the CESR Upgrade (2007)

M. Pisharody, P. Barnes, E. Chojnacki, R. Durand, T. Hays, R. Kaplan, ...

We describe the low power and high power performance of planar waveguide windows designed and fabricated by Thomson Tubes and tested at LNS. These windows are intended for use in the phase III...

Abstract MULTIPACTING IN A RECTANGULAR WAVEGUIDE (2007)

R. L. Geng, H. Padamsee, V. Shemelin

Multipacting in the reduced-height waveguide coupler used in CESR III superconducting RF system is studied through numerical and simplified analytical calculations. An improved model for secondary...

Wakefields and HOMs Studies of a Superconducting Cavity Module (2007)

With The Cesr, S. Belomestnykh, W. Hartung, G. Flynn, J. Kirchgessner, H. Padamsee, ...

investigated in a beam test of the superconducting accelerating cavity module for the CESR upgrade: the time structure of the cavity wake potential, sampled with two bunches, the effect of the module...

On the Low-Field Q-Slope of RF Superconducting Niobium Cavities Cooled by Helium-I (2007)

R. L. Geng, H. Padamsee

Experimental measurements have consistently shown that RF superconducting Niobium cavities cooled by HeI exhibit a mild Q-slope starting at very low gradients. This Q-slope has been attributed to a...

Comparison of the Predicted and Measured Loss Factor of the Superconducting (2007)

Cavity Assembly For, S. Belomestnykh, W. Hartung, J. Kirchgessner, D. Moffat, H. Muller, ...

INTRODUCTION Superconducting cavities have been chosen to replace the existing copper cavities for the future upgrade of CESR. The use of superconducting cavity modules, specially designed for a high...

SRF 020128-01/TESLA Report 2002-01 The optimal shape of cells of a superconducting accelerating section (2007)

V. Shemelin, H. Padamsee

The shape of TESLA accelerating structure can be improved to decrease maximal surface magnetic field by sacrificing and increasing maximal surface electric field. This sacrifice may be necessary...

Realisation of a prototype superconducting CW cavity and cryomodule for energy recovery (2007)

McIntosh, PA, Bate, R, Beard, CD, Cordwell, M, Dykes, DM, Pattalwar, SM, ...

Development of a Prototype Superconducting CW Cavity and Cryomodule for Energy Recovery (2007)

McIntosh, P, Beard, Carl David, Belomestnykh, S, Buechner, A, Byrd, J, Corlett, J, ...

New results with superconducting 500 MHz cavities at CERN (2006)

Bernard, P, Cavallari, G, Chiaveri, Enrico, Häbel, E, Lengeler, H, Padamsee, H, ...

Calculations for breakdown induced by "large defects" in superconducting niobium cavities (2006)

Padamsee, H

Calculated temperature profiles for a niobium plate used to calibrate thermometers for superconducting cavity diagnostics (2006)

Padamsee, H

Demountable $Te_{011}$ cavity for RF superconducting surface studies (2006)

Laurent, J M, Padamsee, H

Superconducting cavities made from niobium-copper composite material (2006)

Padamsee, H

Superconducting cavities made from niobium-copper composite material (2006)

Padamsee, H

Demountable $Te_{011}$ cavity for RF superconducting surface studies (2006)

Laurent, J M, Padamsee, H

12th International Workshop on RF Superconductivity (2005)

Padamsee, H, Belomestnykh, S

Dynamical aspects of multipacting induced discharge in a rectangular waveguide. (2005)

Carter, Richard G., Belomestnykh, S., Geng, R., Padamsee, H.

Multipacting induced discharge in a rectangular waveguide is studied experimentally at a RF frequency of 500 MHz. The waveguide has a cross-section of 457 mm by 102 mm. The maximum forward RF power...

Dynamical aspects of multipacting induced discharge in a rectangular waveguide. (2005)

Geng, R. L., Goudket, P., Carter, Richard G., Belomestnykh, S., Padamsee, H., Dykes, D. M.

Multipacting induced discharge in a rectangular waveguide is studied experimentally at a RF frequency of 500 MHz. The waveguide has a cross-section of 457 mm by 102 mm. The maximum forward RF power...

Noise Performance of Frequency and Phase Locked CW Magnetrons Operated as Current Controlled Oscillators (2005)

Geng, R L, Padamsee, H, Belomestnykh, S, Goudket, P, Dykes, D M, Carter, R G

Dynamical aspects of multipacting induced discharge in a rectangular waveguide (2005)

Geng, RL, Padamsee, H, Belomestnykh, S, Goudket, P, Dykes, DM, Carter, RG

Abstract WORLD RECORD ACCELERATING GRADIENT ACHIEVED IN A SUPERCONDUCTING NIOBIUM RF CAVITY (2004)

R. L. Geng, H. Padamsee, A. Seaman, V. D. Shemelin, At Mv/m To

46 MV/m was achieved in a superconducting niobium cav-ity with an unloaded quality (¢¤ £ factor) ¥§¦¨¥�©�� over at a temperature of � 1.9 K. In pulsed mode, 47 MV/m was achieved....

Suppression of multipacting in rectangular coupler waveguides. (2003)

Geng, R. L., Padamsee, H., Belomestnykh, S., Goudket, P., Dykes, D. M., Carter, Richard G.

Although a rectangular waveguide coupler has the conceptual advantages of simplicity and capability of withstanding higher power, builders of modern superconducting accelerators are routinely...

Suppression of multipacting in rectangular coupler waveguides (2003)

Geng, R L, Padamsee, H, Belomestnykh, S, Goudket, P, Dykes, D M, Carter, R G

A 1500 Mhz Niobium Cavity Made of Electropolished Half-Cells (2003)

R. L. Geng, A. Crawford, G. Eremeev, H. Padamsee, J. Sears

A 1500 MHz niobium cavity has been fabricated with two half-cells, which are pre-electropolished with a very simple and compact system. In this paper, we present halfcell electropolishing, cavity...

Recent progress in neutrino factory and muon collider research within the Muon collaboration (2002)

Neutrino Factory Collaboration, Alsharoa, MM, Ankenbrandt, CM, Atac, M, Autin, BR, Balbekov, VI, ...

Experimental studies of electron multipacting in CESR type rectangular waveguide couplers. (2002)

Geng, R. L., Belomestnykh, S., Padamsee, H., Reilly, J., Goudket, P., Dykes, D. M., ...

Multipacting induced breakdown in rectangular waveguide couplers. (2002)

Geng, R. L., Belomestnykh, S., Padamsee, H., Reilly, J., Goudket, P., Dykes, D. M., ...

Feasibility study 2 of a muon based neutrino source (2001)

Ozaki, S, Palmer, RB, Zisman, MS, Gallardo, JC, Goodman, M, Hassanein, A, ...

A Feasibility study of a neutrino source based on a muon storage ring (2000)

Holtkamp, N, Finley, DA, Anderson, T, Andreev, N, Ankenbrandt, CM, Assadi, S, ...

Superconducting TESLA cavities (2000)

Aune, B., Bandelmann, R., Bloess, D., Bonin, B., Bosotti, A., Champion, M., ...