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N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Introduction 1. Electrostatic simulations with MAFIA BPM for damping wiggler BPM for standard vacuum.

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Presentation on theme: "N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Introduction 1. Electrostatic simulations with MAFIA BPM for damping wiggler BPM for standard vacuum."— Presentation transcript:

1 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Introduction 1. Electrostatic simulations with MAFIA BPM for damping wiggler BPM for standard vacuum chamber 2. Simulations with Microwave Studio (MWS) Coupling between BPM-buttons EM Simulations for PETRA3 N. Baboi, DESY, Hamburg BPM Workshop, Lüneburg, Nov. 30, 2006

2 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 PETRA3 Energy: 6 GeV Emittance: 1nm rad Current: 100 mA Bunches: 40 / 960

3 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 BPMs for PETRA3 235 BPMs (buttons) for various chamber sections

4 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Monitor Constant 1/K UR DR UL DL

5 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, Electrostatic Simulations (MAFIA) Electrostatic calculation 1 V at one button calculate field distribution monitor constant K through reflections field for all 4 buttons combine these fields H and V K H and K V coupling factor between beam and BPM-pickups = voltage at middle of BPM for 1 V at one button (in %)

6 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, a. BPM for Damping Wiggler chamber: 30 x 120 distance between buttons = 24 mm

7 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 BPM for Damping Wiggler: Coupling coupling 10%

8 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 BPM for Damping Wiggler: Monitor Constant H V

9 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 BPM for Damping Wiggler: Monitor Constant (2) Button distance 1/K x [mm -1 ] 1/K y [mm -1 ] Coupling [%] /K H = 0.08 mm -1 1/K V = 0.06 mm -1 For 1 mm resolution need 8·10 -5 resolution in V

10 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, b. Standard Chamber R. Wanzenberg 1/K H = mm -1 for = 55 deg 1/K V = mm -1 for = 55 deg

11 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, Coupling between Buttons: UR – UL MAFIA-S: Electrostatic Simulation button defined as vacuum ~0.9e-4V coupling to beam: 23% coupling to button 0.009%

12 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons: UR – DR MAFIA-S: Electrostatic Simulation button defined as vacuum ~0.12V coupling to button 10% BUT measurement (Neumann): -45dB -> 0.6%!

13 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Microwave Studio: S-parameters (normalized to 50 Ohm) good agreement to measurements

14 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Microwave Studio: Time Domain port 1 port 3 port 2port 4 electric (or magnetic) boundaries source

15 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Time Domain – Results

16 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, : ports 5: discrete port (source) 1-4: ports 5: discrete port (source) port 1 port 2 port 3 port 4 discrete port 5 (S-Param, 10k practically I-source) electric boundaries Coupling between Buttons Beam Simulation

17 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Beam Simulation - Results

18 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Beam Simulation - Results (2) Current / Voltage

19 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Coupling between Buttons Beam Simulation - Results (3) worst case: other buttons are short-circuited => no difference! Effect of other buttons

20 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006

21 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, Error Analysis: BPM for Straight Section chamber: 94 x mm buttons (Meggitt) 5deg error in UR and DL pickups

22 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Preliminary: BPM for Straight Section: Monitor Constant Without error With 5 deg error 10% error

23 N. Baboi, DESY BPM Workshop, Lüneburg, Nov. 30, 2006 Preliminary: BPM for Straight Sections Fields without/with angle error 5deg angle error


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