Uppsala Progress Report

Slides:

Advertisements

Similar presentations

Status of 500-kV DC gun at JAEA N. Nishimori, R. Nagai, R. Hajima Japan Atomic Energy Agency (JAEA) M. Yamamoto, T. Miyajima, Y. Honda KEK H. Iijima, M.

Advertisements

Components of Initial Eprobe Startup Electron Gun –turning on beam, setting beam current, acceleration, saturation level Focusing lenses –Permit focussed.

Field Emission Measurements with CERN DC-Spark System Tomoko MURANAKA Hebrew University / CERN.

Building an Electron Accelerator for Use in a Free-Electron Laser by Daniel P. Mills.

High Gradient and High Q R&D Topics 1- Explore Q > for TESLA parameter flexibility –higher luminosity through higher rep rate, longer rf pulse… 2-

CLIC Breakdown Workshop – CERN, May / 13 Delay Times in Breakdown Triggering CERN, TS-MME Antoine Descoeudres, Sergio Calatroni, Mauro Taborelli.

DC breakdown measurements Sergio Calatroni Present team: Gonzalo Arnau Izquierdo, Jan Kovermann, Chiara Pasquino, Rocio Santiago Kern, Helga Timko, Mauro.

100506, CERNV. Ziemann: In-situ breakdown in SEM1 Plans for In-situ Breakdown Studies in a Scanning Electron Microscope V. Ziemann, R. Ruber, T. Muranaka,

PST ２００７ BNL 1 Development of High- performance Polarized e- source at Nagoya University. Nagoya University M.Yamamoto, S.Okumi, T.Konomi N.Yamamoto, A.Mano,

Vacuum Technology in Electrical Switches

CLIC Workshop – CERN, October / 17 DC breakdown experiments for CLIC CERN, TS-MME Antoine Descoeudres, Trond Ramsvik, Sergio Calatroni, Mauro Taborelli.

Design and fabrication of electrical measurement system for microchannel plates (LAPD weekly group meeting) Feb Anil Mane, Qing Peng, Jeffrey Elam.

(F E D) FIELD EMISSION DISPLAY DEEPAK GUPTA EC 3 rd YR

5 th RD51 meeting (WG1) 25 May 2009 Atsuhiko Ochi ( Kobe University )

Atsuhiko Ochi Kobe University

Evaluation of Elastic Property of Thin Films by MEMS

» RHIC Polarimetry « Oleg Eyser for the RHIC Polarimetry Group 2014 RHIC Retreat, August 14.

Status of the Photocathode R&D for ATF RFgun N.Terunuma (KEK)

Walter WuenschLCWS October 2012 Workshops on X-band and high gradients: collaboration and resource.

K. Floettmann WSHQE, OCT. 5, 2006 WSHQE Oct. 5, 2006 Klaus Floettmann Photo cathode requirements for the European XFEL.

DC Spark Developments Nick Shipman - Thursday, 16 August

DC Spark Test System for CLIC

Stochastic Hydrology Random Field Simulation Professor Ke-Sheng Cheng Department of Bioenvironmental Systems Engineering National Taiwan University.

Performance and Early Results from the Muon Tracking System of Rusty Towell of Abilene Christian University for the PHENIX collaboration First Joint Meeting.

Status of high gradient experiments at Nextef Kazue Yokoyama, Toshiyasu Higo, Yasuo Higashi, Shuji Matsumoto, Shigeki Fukuda Accelerator Laboratory, KEK.

Task 9.2: Normal conducting high- gradient cavities  Co-ordination: G. Riddone  Sub-tasks:  1. PETS (CIEMAT)  2.HOM Damping (UNIMAN)  3.Breakdown.

COPPER PHOTOCATHODES DEVELOPMENTS AT ASTEC R. Valizadeh Accelerator Science and Technology Centre Science & Technology Facility Council, UK.

Facility to coat the SPS magnets with carbon Objective: coat at least 90% of the SPS with a carbon thin film with low secondary electron emission in order.

Mg Films Grown by Pulsed Laser Deposition as Photocathodes: QE and surface adsorbates L. Cultrera INFN – National Laboratories of Frascati.

Pulsed Laser Deposition and Quantum Efficency of Mg films University of Lecce L. Cultrera.

Chapter  The electrochemical cells require the INPUT of energy rather than creating energy.

Scanning Electron Microscope (SEM) in situ field emission measurement in Uppsala Univ. Tomoko Muranaka CERN, Switzerland 25 October 2012, LCWS12 This work.

Electron sources and guns

DC Sputtering Disadvantage #1 Low secondary electron yield

Rint Simulations & Comparison with Measurements

HXR emission and flare ribbon expansion – X3.8 flare of 17-Jan-2005

Transversal calibration of Geiger Cells

Influence of Depth of Cathode Arc-remelted Layer on Vacuum Insulation

3rd International Workshop on Mechanisms of Vacuum Arcs (MeVArc 2012)

CERN/EN/MME-MM/EDMS draft

Summary of Prev. Lecture

Participation IAP NAS of Ukraine in understanding of vacuum breakdown phenomena Iaroslava Profatilova, V.Baturin, O. Karpenko.

Electrochemical Etching of W and Ag Tips for STM and STM-Light Emission Studies Conor Omand Supervisor: Sarah Burke.

Nick Shipman - Monday, 4 April 2011

SEM In-situ Experiments for Breakdown Study

Uppsala University, WP 9.2 In-situ discharge experiments inside an Electron-microscope Field emission probe Simple scanning Cut and Slice, voids Upgrade.

Molecular Dynamics Simulations of Ion Irradiation of a Surface under an Electric Field S. Parviainen, F. Djurabekova.

Y. Irie, KEK for the LOI collaboration

ArcPIC2D update: Arc spreading through flat emission Kyrre N

Part 2: Comparison of measurements and simulations for OBLA-500keV

In Corial PECVD SYSTEMS

III. Voltage [Physics 2702] Dr. Bill Pezzaglia Updated 2015Feb.

Field Emission Measurement

at Helmholtz-Zentrum Berlin

Gabriel Palacios 03/15/17 Shed modifications Gabriel Palacios 03/15/17.

Stochastic Hydrology Random Field Simulation

Status of 500-kV DC gun at JAEA

Sensor probing (Summary)

Transition Radiation Studies with Xe GlueX Collaboration Meeting

Secondary Electron Emission in Photocathode RF Guns

November 14, 2008 The meeting on RIKEN AVF Cyclotron Upgrade Progress report on activity plan Sergey Vorozhtsov.

Gabriel Palacios 08/30/ kV guns CST + GPT Gabriel Palacios 08/30/18.

350kV and 500kV Yan 9/8.

АВЛИГАТАЙ ТЭМЦЭХ ҮНДЭСНИЙ ХӨТӨЛБӨР /танилцуулга/

Thermionic Emission – Learning Outcomes

Isotopes Atoms of the same element with a different number of neutrons

Results of A Compact Reflex Triode With Multi Cavity Adjustment

Updates: Characterization and Aging

Field-Emission mapping measurement on Copper Surface

The Experimental Study on Vacuum Breakdowns by Optical Diagnosis

Presentation transcript:

Uppsala Progress Report New sample holder IV measurements and surface damage observations 5um W tip – Cu mirror surface 5um W tip – Cu etched surface NIMA XB10 proceeding was accepted 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. Last meeting (25 Jan.) Cathode: Cu etched surface (sodium persulfate, 30sec, inspired by Higashi's presentation at XB10) Anode: 0.5 um W tip Gradient: several hundred MV/m 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. New setup Basic Idea: Reproduce high gradient electric field conditions in micro meter range: 1 GV/m = 1 kV/μm New! · An inclined sample holder has been installed The piezomotor is on the ramp to avoid hitting the electron column. The new sample holder sets the sample surface perpendicular to the tip. Piezo motor W tip Cu sample 03 May 2011 T. Muranaka, Uppsala Univ. Exp. setup

T. Muranaka, Uppsala Univ. New measurements Condition 1 (17-18 Feb, 23-24 Feb) Cathode: Cu etched surface (17 Feb morning) Anode: 5um W tip Gap: 1.5um Bias: 0 - 2kV Distinct variations in the size of damaged area were observed among several measurements with same condition, although measured currents were almost the same (i.e. deposited energy on the surface were same) (see the next slide). The positive bias was put on the W tip (of 5um radius instead 0.5um in the last report) keeping the gap of 1um from the sample surface. 03 May 2011 T. Muranaka, Uppsala Univ.

Current vs time (bias step: 20V) 10-6 0.8 0.5 800V Current 720V Bias [kV] 0.6 Step 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. New measurements Condition 2 Cathode: Cu mirror surface Anode: 5 um W tip Gap: 1um Bias: 0 - 1kV Measured currents were similar to that of the condition 1 (with etched surface) but surface melting was not observed. Carbon contaminations were used as markers but dispersed after IV measurements. Whitish contaminations were observed several times. 03 May 2011 T. Muranaka, Uppsala Univ.

Current vs time (bias step: 2V) 10-6 0.6 Bias [kV] Current [A] Step 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. Before IV measurement Carbon contamination 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. After IV measurement 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. After IV measurement (the tip is retracted) 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. New measurements Before measurement After measurement 03 May 2011 T. Muranaka, Uppsala Univ.

T. Muranaka, Uppsala Univ. Summary Questions: Why the current is unstable? (even after 3h of run) Why higher gradient? Is cleaning needed? Is conditioning needed? Is there any correlation between emission current (or emission process?) and surface damage/contamination? Plan: Cleaning & conditioning process on the mirror surface 03 May 2011 T. Muranaka, Uppsala Univ.