R Jobe

All Publications

• Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction. Structural dynamics (Melville, N.Y.) Shen, X., Nunes, J. P., Yang, J., Jobe, R. K., Li, R. K., Lin, M., Moore, B., Niebuhr, M., Weathersby, S. P., Wolf, T. J., Yoneda, C., Guehr, M., Centurion, M., Wang, X. J. 2019; 6 (5): 054305

  Abstract

  The development of ultrafast gas electron diffraction with nonrelativistic electrons has enabled the determination of molecular structures with atomic spatial resolution. It has, however, been challenging to break the picosecond temporal resolution barrier and achieve the goal that has long been envisioned-making space- and-time resolved molecular movies of chemical reaction in the gas-phase. Recently, an ultrafast electron diffraction (UED) apparatus using mega-electron-volt (MeV) electrons was developed at the SLAC National Accelerator Laboratory for imaging ultrafast structural dynamics of molecules in the gas phase. The SLAC gas-phase MeV UED has achieved 65 fs root mean square temporal resolution, 0.63A spatial resolution, and 0.22A-1 reciprocal-space resolution. Such high spatial-temporal resolution has enabled the capturing of real-time molecular movies of fundamental photochemical mechanisms, such as chemical bond breaking, ring opening, and a nuclear wave packet crossing a conical intersection. In this paper, the design that enables the high spatial-temporal resolution of the SLAC gas phase MeV UED is presented. The compact design of the differential pump section of the SLAC gas phase MeV UED realized five orders-of-magnitude vacuum isolation between the electron source and gas sample chamber. The spatial resolution, temporal resolution, and long-term stability of the apparatus are systematically characterized.

  View details for DOI 10.1063/1.5120864

  View details for PubMedID 31649964

• A terahertz pump mega-electron-volt ultrafast electron diffraction probe apparatus at the SLAC Accelerator Structure Test Area facility JOURNAL OF INSTRUMENTATION Ofori-Okai, B. K., Hoffmann, M. C., Reid, A. H., Edstrom, S., Jobe, R. K., Li, R. K., Mannebach, E. M., Park, S. J., Polzin, W., Shen, X., Weathersby, S. P., Yang, J., Zheng, Q., Zajac, M., Lindenberg, A. M., Glenzer, S. H., Wang, X. J. 2018; 13

  View details for DOI 10.1088/1748-0221/13/06/P06014

  View details for Web of Science ID 000435599800007

• A direct electron detector for time-resolved MeV electron microscopy REVIEW OF SCIENTIFIC INSTRUMENTS Vecchione, T., Denes, P., Jobe, R. K., Johnson, I. J., Joseph, J. M., Li, R. K., Perazzo, A., Shen, X., Wang, X. J., WEATHERSBY, S. P., Yang, J., Zhang, D. 2017; 88 (3)

  Abstract

  The introduction of direct electron detectors enabled the structural biology revolution of cryogenic electron microscopy. Direct electron detectors are now expected to have a similarly dramatic impact on time-resolved MeV electron microscopy, particularly by enabling both spatial and temporal jitter correction. Here we report on the commissioning of a direct electron detector for time-resolved MeV electron microscopy. The direct electron detector demonstrated MeV single electron sensitivity and is capable of recording megapixel images at 180 Hz. The detector has a 15-bit dynamic range, better than 30-μm spatial resolution and less than 20 analogue-to-digital converter count RMS pixel noise. The unique capabilities of the direct electron detector and the data analysis required to take advantage of these capabilities are presented. The technical challenges associated with generating and processing large amounts of data are also discussed.

  View details for DOI 10.1063/1.4977923

  View details for Web of Science ID 000397871400027

  View details for PubMedID 28372435

• Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory REVIEW OF SCIENTIFIC INSTRUMENTS WEATHERSBY, S. P., Brown, G., Centurion, M., CHASE, T. F., Coffee, R., Corbett, J., Eichner, J. P., Frisch, J. C., Fry, A. R., Guehr, M., Hartmann, N., Hast, C., HETTEL, R., Jobe, R. K., Jongewaard, E. N., LEWANDOWSKI, J. R., Li, R. K., Lindenberg, A. M., Makasyuk, I., May, J. E., McCormick, D., Nguyen, M. N., Reid, A. H., Shen, X., Sokolowski-Tinten, K., Vecchione, T., Vetter, S. L., Wu, J., Yang, J., Duerr, H. A., Wang, X. J. 2015; 86 (7)

  Abstract

  Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used to study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic electron beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time and length scales. SLAC National Accelerator Laboratory recently launched the Ultrafast Electron Diffraction (UED) and microscopy Initiative aiming at developing the next generation ultrafast electron scattering instruments. As the first stage of the Initiative, a mega-electron-volt (MeV) UED system has been constructed and commissioned to serve ultrafast science experiments and instrumentation development. The system operates at 120-Hz repetition rate with outstanding performance. In this paper, we report on the SLAC MeV UED system and its performance, including the reciprocal space resolution, temporal resolution, and machine stability.

  View details for DOI 10.1063/1.4926994

  View details for Web of Science ID 000358934400053

  View details for PubMedID 26233391

• Laser ionized preformed plasma at FACET PLASMA PHYSICS AND CONTROLLED FUSION Green, S. Z., Adli, E., Clarke, C. I., Corde, S., Edstrom, S. A., Fisher, A. S., FREDERICO, J., Frisch, J. C., Gessner, S., Gilevich, S., Hering, P., Hogan, M. J., Jobe, R. K., Litos, M., May, J. E., Walz, D. R., Yakimenko, V., Clayton, C. E., Joshi, C., Marsh, K. A., Vafaei-Najafabadi, N., Muggli, P. 2014; 56 (8)

  View details for DOI 10.1088/0741-3335/56/8/084011

  View details for Web of Science ID 000340055300012

• Direct measurement of the transverse wakefields of tapered collimators PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS Tenenbaum, P., Bane, K. L., Eriksson, L., Irwin, J., Jobe, R. K., McCormick, D., Ng, C. K., Raubenheimer, T. O., Ross, M. C., Stupakov, G., Walz, D., Onoprienko, D., Zagorodnov, I. 2007; 10 (3)

  View details for DOI 10.1103/PhysRevSTAB.10.034401

  View details for Web of Science ID 000245810500014

• Low-level RF signal processing for the next linear collider test accelerator 17th Particle Accelerator Conference Holmes, S., Ziomek, C., Adolphsen, C., Akre, R., Allison, S., Clark, S., Dean, T., Fuller, R. W., Gold, S., Jobe, R. K., Koontz, R., LAVINE, T. L., Nantista, C., Wilson, Z., Young, A. IEEE. 1998: 3027–3029

  View details for Web of Science ID 000079582800983

• SLC interferometer system and phase distribution upgrades Akre, R., Decker, F. J., Jobe, R. K., Koontz, R., Mitchell, M., Strozinsky, R., Comyn, M., Craddock, M. K., Reiser, M., Thomson, J. IEEE. 1998: 3021–23

  View details for Web of Science ID 000079582800981

• 1ST MEASUREMENT OF THE LEFT-RIGHT CROSS-SECTION ASYMMETRY IN Z-BOSON PRODUCTION BY E+E- COLLISIONS PHYSICAL REVIEW LETTERS Abe, K., Abt, I., Acton, P. D., ADOLPHSEN, C. E., Agnew, G., Alber, C., ALZOFON, D. F., Antilogus, P., Arroyo, C., Ash, W. W., Ashford, V., Astbury, A., Aston, D., Au, Y., AXEN, D. A., Bacchetta, N., Baird, K. G., Baker, W., Baltay, C., Band, H. R., Baranko, G., Bardon, O., Barrera, F., Battiston, R., Bazarko, A. O., Bean, A., Beer, G., BELCINSKI, R. J., Bell, R. A., Bendavid, R., Benvenuti, A. C., Berger, R., Berridge, S. C., Bethke, S., Biasini, M., Bienz, T., Bilei, G. M., Bird, F., Bisello, D., Blaylock, G., BLUMBERG, R., Bogart, J. R., Bolton, T., Bougerolle, S., Bower, G. R., Boyce, R. F., Brau, J. E., Breidenbach, M., Browder, T. E., Bugg, W. M., Burgess, B., Burke, D., Burnett, T. H., Burrows, P. N., Busza, W., BYERS, B. L., Calcaterra, A., Caldwell, D. O., Calloway, D., Camanzi, B., Camilleri, L., Carpinelli, M., Carr, J., Cartwright, S., Cassell, R., Castaldi, R., Castro, A., CAVALLISFORZA, M., Chadwick, G. B., Chamberlain, O., Chambers, D., Chen, L., Clarke, P. E., Claus, R., Clendenin, J., Cohn, H. O., Coller, J. A., Cook, V., Cords, D., Cotton, R., Cowan, R. F., Coyle, P. A., Coyne, D. G., Craddock, W., Cutler, H., DOLIVEIRA, A., Damerell, C. J., Dasu, S., Davis, R., deSangro, R., Desimone, P., DeSimone, S., Dean, T., Decker, F. J., DeJongh, F., DELLORSO, R., Disco, A., Dolin, R., Downing, R. W., Du, Y. C., Dubois, R., Duboscq, J. E., Dunwoodie, W., DURRETT, D. D., ECKLUND, S. D., Eigen, G., Eisenstein, B. I., Elia, R., EMMA, P. J., EMMET, W. T., English, R. L., Erdos, E., Escalera, J., Fan, C., Fero, M. J., Ferrie, J., Fieguth, T., Flynn, J., FORBUSH, D. A., Fortune, K. M., Fox, J. D., Fox, M. J., Frey, R., Freytag, D. R., Friedman, J. I., Frisch, J., Fujimoto, J., Furuno, K., Gaillard, M., Gallinaro, M., GARWIN, E., Gillman, T., GIOUMOUSIS, A., Gladding, G., Gonzalez, S., GURD, D. P., Hale, D. L., HALLER, G. M., Hallewell, G. D., Hamilton, V., Haney, M. J., HANSLKOZANECKA, T., HARGIS, H., Harrison, J., Hart, E. L., Hasegawa, K., Hasegawa, Y., Hedges, S., Hertzbach, S. S., Hildreth, M. D., HILOMEN, R. C., HIMEL, T. M., Hitlin, D. G., Hodges, T. A., Hodgson, J., HOEFLICH, J. J., Honma, A., HORELICK, D., Huber, J., Huffer, M. E., Hughes, E. W., Hwang, H., Hyatt, E., Iwasaki, Y., Izen, J. M., Jobe, R. K., Jacques, P., Jako, C., Johnson, A. S., Johnson, J. R., Johnson, R. A., Jones, S., Junk, T., Kaiser, S., Kajikawa, R., Kalelkar, M., Kang, H., Karliner, I., Kawahara, H., Keeler, R. K., Kelsey, M. H., Kendall, H. W., KHARAKH, D., Kim, H. Y., Kim, P. C., King, R., Klein, M., Kofler, R. R., Kowitt, M., Krejcik, P., Krishna, N. M., Kroeger, R. S., Kulikov, A. V., Kunz, P. F., Kwon, Y., Labs, J. F., LANGSTAFF, R. R., Langston, M., Larsen, R., Lath, A., Lauber, J. A., Leith, D. W., Limberg, T., Lintern, L., Liu, X., Loreti, M., Lu, A., Lynch, H. L., Lyons, T., Ma, J., Majid, W. A., Mancinelli, G., Manly, S., Mansour, D., Mantovani, G., Markiewicz, T. W., Maruyama, T., Mason, G. R., Masuda, H., Mathys, L., Mazaheri, G., Mazzucato, A., Mazzucato, E., McCormick, D. J., McGowan, J. F., McHugh, S., McKemey, A. K., Meadows, B. T., Mellor, D. J., Messner, R., Mincer, A. I., Minty, M., Mockett, P. M., Moffeit, K. C., Morrison, R. J., Mours, B., Mueller, G., Muller, D., Mundy, G., Nagamine, T., Nauenberg, U., Neal, H., Nelson, D., Nesterov, V., Nordby, M., Nussbaum, M., Nuttall, A., Ogren, H., Olsen, J., Oram, C., Osborne, L. S., OSSA, R., Oxoby, G., Paffrath, L., PALOUNEK, A., Panvini, R. S., Park, H., Pauluzzi, M., Pavel, T. J., Perrier, F., Peruzzi, I., Pescara, L., Peters, D., Petersen, H., PETRADZA, M., PHINNEY, N., Piccolo, M., Piemontese, L., Pieroni, E., Pitthan, R., Pitts, K. T., Plano, R. J., Poffenberger, P. R., Prepost, R., Prescott, C. Y., Pripstein, D., Punkar, G. D., Putallaz, G., Raimondi, P., Rankin, P., Ratcliff, B. N., Reeves, T. W., Rensing, P. E., Richman, J. D., RINTA, R., Robertson, L. P., Rochester, L. S., Rosenson, L., Ross, M. C., Rothberg, J. E., Rothenberg, A., Rowson, P. C., Russell, J. J., Rust, D., RUTZ, E., Saez, P., SANTHA, A. K., Santocchia, A., Saxton, O. H., Schalk, T., SCHENK, P. R., Schindler, R. H., Schneekloth, U., Schneider, M., Schultz, D., Schultz, G. E., Schumm, B. A., Seeman, J. T., Seiden, A., Servoli, L., Settles, M., Shaevitz, M. H., Shank, J. T., Shapiro, G., Shapiro, S. L., Shaw, H., Sheppard, J. C., Sherden, D. J., Shimomura, T., Shoup, A., SHYPIT, R. L., Siemann, R. H., Simopoulos, C., Skarpaas, K., Smith, S. R., Snyder, A., Snyder, J. A., Sobie, R., Sokoloff, M. D., SPENCE, W. L., Spencer, E. N., STLORANT, S., Stamer, P., Steiner, H., Steiner, R., Stephenson, R. J., Stewart, G., Stiles, P., STOCKDALE, I. E., Strauss, M. G., Su, D., Suekane, F., Sugiyama, A., Suzuki, S., Swartz, M., Szumilo, A., Tahar, M. Z., Takahashi, T., Tang, H., TAPPERN, G. J., Tarnopolsky, G., Taylor, F. E., Tecchio, M., Thaler, J. J., Toevs, F., Toge, N., Turcotte, M., Turk, J. D., Turner, J. L., Usher, T., Vavra, J., Vannini, C., Vella, E., Venuti, J. P., Verdier, R., Verdini, P. G., WADSWORTH, B. F., Waite, A. P., Walker, N. J., Walz, D., Warner, D., Watt, R., Watts, S. J., Weber, T., Weidemann, A. W., Whitaker, J. S., White, S. L., Wickens, F. J., WICKERT, S. A., Williams, D. A., Williams, D. C., Williams, R. W., Williams, S. H., Wilson, R. J., Wisniewski, W. J., Witherell, M. S., WOODLY, M. D., Woods, M., Word, G. B., Wyss, J., Yamamoto, R. K., Yamartino, J. M., Yee, C., Yeremian, A. D., Yellin, S. J., Yim, A., Young, C. C., Young, K. K., Yuta, H., Zapalac, G., Zdarko, R. W., Zeitlin, C., Zhou, J., Ziemann, V., Zolotorev, M., Zucchelli, P. 1993; 70 (17): 2515-2520

  View details for Web of Science ID A1993KY50300003

• LENGTH MONITOR FOR 1-MM SLC BUNCHES 1993 Particle Accelerator Conference Babenko, E., Jobe, R. K., McCormick, D., Seeman, J. T. I E E E. 1993: 2423–2425

  View details for Web of Science ID A1993BA40R00800

• USING TRANSIENT WAVE-FORM RECORDERS TO MEASURE AND STORE BEAM PARAMETERS STEGE, R. E., JOBE, R. K., ROSS, M., Corneliussen, S. T., Carlton, L. I E E E. 1993: 2234–36

  View details for DOI 10.1109/PAC.1993.309279

  View details for Web of Science ID A1993BA40R00736

• MULTIBUNCH ENERGY AND SPECTRUM CONTROL IN THE SLC HIGH-ENERGY LINAC SEEMAN, J. T., DECKER, F. J., JOBE, R. K., HSU, LIZAMA, L., CHEW, J. I E E E. 1991: 3210–12

  View details for DOI 10.1109/PAC.1991.165237

  View details for Web of Science ID A1991BV39S01047

• ENERGY FEED FORWARD AT THE SLC JOBE, R. K., BROWN, M. J., HSU, MILLER, E., LIZAMA, L., CHEW, J. I E E E. 1991: 1464–66

  View details for DOI 10.1109/PAC.1991.164670

  View details for Web of Science ID A1991BV39S00476

• INITIAL MEASUREMENTS OF Z-BOSON RESONANCE PARAMETERS IN E+E- ANNIHILATION PHYSICAL REVIEW LETTERS Abrams, G. S., ADOLPHSEN, C. E., Aleksan, R., Alexander, J. P., Allen, M. A., Atwood, W. B., Averill, D., Ballam, J., Bambade, P., Barish, B. C., Barklow, T., Barnett, B. A., Bartelt, J., Bethke, S., BLOCKUS, D., DeBoer, W., Bonvicini, G., Boyarski, A., Brabson, B., Breakstone, A., Breidenbach, M., Brom, J. M., Brown, J. L., Brown, K. L., Bulos, F., Burchat, P. R., Burke, D. L., Cence, R. J., Chapman, J., Chmeissani, M., Clendenin, J., Cords, D., Coupal, D. P., Dauncey, P., Dean, N. R., DESTAEBLER, H. C., Dorfan, D. E., DORFAN, J. M., Drell, P. S., DREWER, D. C., Dydak, F., Ecklund, S., Elia, R., Erickson, R. A., Fay, J., FELDMAN, G. J., Fernandes, D., Field, R. C., Fieguth, T. H., FISCHER, G. E., Ford, W. T., Fordham, C., Frey, R., Fujino, D., Gan, K. K., Gatto, C., Gero, E., GIDAL, G., Glanzman, T., Goldhaber, G., Cadenas, J. J., Gratta, G., Grindhammer, G., GROSSEWIESMANN, P., HANSON, G., Harr, R., Harral, B., Harris, F. A., Hawkes, C. M., Hayes, K., Hearty, C., Herrup, D., Heusch, C. A., Hildreth, M. D., Himel, T., Hinshaw, D. A., Holmgren, S. O., Hong, S. J., Hutchinson, D., Hutton, A., Hylen, J., Innes, W. R., Jacobsen, R. G., Jaffre, M., Jaros, J. A., Jobe, R. K., Jung, C. K., Kadyk, J. A., Karlen, D., Kent, J., King, M., Klein, S. R., Koetke, D. S., Komamiya, S., Koska, W., Kowalski, L. A., Kozanecki, W., Kral, J. F., Kuhlen, M., Kulikov, A. V., Labarga, L., Lankford, A. J., LARSEN, R. R., LeDiberder, F., Levi, M. E., Litke, A. M., Lohse, T., Luth, V., Lynch, G. R., McKenna, J. A., Matthews, J. A., Mattison, T., Milliken, B. D., Moffeit, K. C., MUNGER, C. T., Murray, J. J., Murray, W. N., NASH, J., Ogren, H., Ong, R. A., OSHAUGHNESSY, K. F., Parker, S. I., Peck, C., PERL, M. L., Perrier, F., Petersen, A., PETRADZA, M., PHINNEY, N., Pitthan, R., Porter, F. C., Rankin, P., Rees, J. R., Richman, J. D., Riles, K., Rivkin, L., Ross, M. C., ROUSE, F. R., Rust, D. R., Sadrozinski, H. F., SCHAAD, M. W., SCHALK, T. L., Schumm, B. A., Schwarz, A. S., Seeman, J. T., Seiden, A., Sheppard, J. C., Smith, J. G., Snyder, A., Soderstrom, E., Stiening, R., Stoker, D. P., Stroynowski, R., Swartz, M., Thun, R., Toge, N., Trilling, G. H., VanKooten, R., Voruganti, P., Wagner, S. R., Watson, S., Weber, P., WEIGEND, A., Weinstein, A. J., WEIR, A. J., White, S. L., Wicklund, E., Wolf, R. C., Wood, D. R., Woods, M., Wormser, G., Wright, R., Wu, D. Y., Yurko, M., ZACCARDELLI, C., VONZANTHIER, C. 1989; 63 (7): 724-727

  View details for Web of Science ID A1989AK17500008

• THE SLAC LINAC AS USED IN THE SLC COLLIDER SEEMAN, J. T., ABRAMS, G., ADOLPHSEN, C., ATWOOD, W., BANE, K. L., IVERSON, R., JACOBSEN, R., HIMEL, T. M., JOBE, R. K., LAVINE, T. L., LEE, M., MCCORMICK, D., MORTON, P., PITTHAN, R., RACKELMANN, A., ROSS, M., RUTH, R., SHEPPARD, J., SMITH, P., SODERSTROM, E., STANEK, M., STIENING, R., SWARTZ, M., THOMPSON, K., TURNER, J., WILLIAMS, S., WEINSTEIN, A., WOODLEY, M., ZICKER, J., BENNETT, F., KOPTA, J. I E E E. 1989: 983–86

  View details for DOI 10.1109/PAC.1989.73322

  View details for Web of Science ID A1989BQ56Q00315

• PHASING TOOLS FOR THE KLYSTRONS AT THE SLC JOBE, R. K., PHINNEY, N., ADOLPHSEN, C., BENNETT, F., KOPTA, J. I E E E. 1989: 1984–86

  View details for DOI 10.1109/PAC.1989.73002

  View details for Web of Science ID A1989BQ56Q00644

• RF PHASE DISTRIBUTION-SYSTEMS AT THE SLC JOBE, R. K., SCHWARZ, H. D., BENNETT, F., KOPTA, J. I E E E. 1989: 1987–89

  View details for DOI 10.1109/PAC.1989.73003

  View details for Web of Science ID A1989BQ56Q00645

• HARDWARE UPGRADE FOR KLYSTRONS IN THE SLC IEEE TRANSACTIONS ON NUCLEAR SCIENCE Jobe, R. K., Browne, M. J., Slattery, K. P. 1985; 32 (5): 2107-2109

  View details for Web of Science ID A1985G933200176

• KLYSTRON CONTROL SOFTWARE IN THE SLC IEEE TRANSACTIONS ON NUCLEAR SCIENCE JOBE, R. K., THOMPSON, K., PHINNEY, N. 1985; 32 (5): 2110–11

  View details for DOI 10.1109/TNS.1985.4333831

  View details for Web of Science ID A1985G933200177

• HIGH-RESOLUTION BEAM PROFILE MONITORS IN THE SLC IEEE TRANSACTIONS ON NUCLEAR SCIENCE Ross, M. C., Seeman, J. T., Jobe, R. K., Sheppard, J. C., Stiening, R. F. 1985; 32 (5): 2003-2005

  View details for Web of Science ID A1985G933200141

• A MULTICHANNEL PULSER FOR THE SLC THERMIONIC ELECTRON SOURCE IEEE TRANSACTIONS ON NUCLEAR SCIENCE Browne, M. J., Clendenin, J. E., CORREDOURA, P. L., Jobe, R. K., KOONTZ, R. F., Sodja, J. 1985; 32 (5): 1829-1831

  View details for Web of Science ID A1985G933200084

• GENERATION AND ACCELERATION OF HIGH-INTENSITY BEAMS IN THE SLC INJECTOR IEEE TRANSACTIONS ON NUCLEAR SCIENCE Ross, M. C., Browne, M. J., Clendenin, J. E., Jobe, R. K., Seeman, J. T., Sheppard, J. C., Stiening, R. F. 1985; 32 (5): 3160-3162

  View details for Web of Science ID A1985ARG7100153

• A NEW CONTROL-SYSTEM FOR THE SLAC ACCELERATOR KLYSTRONS FOR SLC IEEE TRANSACTIONS ON NUCLEAR SCIENCE JOBE, R. K. 1983; 30 (4): 2325–27

  View details for DOI 10.1109/TNS.1983.4332804

  View details for Web of Science ID A1983RA81800121