TTF EMI/EMC Working Group Meeting 29/05/2006 H. Kapitza (FLA) EMI Steering Group Report 1. Epcos EMC Filter Seminar: • On May 4, 2006 there was an EMC Filter Seminar held in the Novotel HH-Schnelsen, organized by the Epcos company, the former passive components branch of Siemens. • The event was surprisingly neutral, with some very nice talks and good documentation. • Is there a problem to join such events? 2. Next meeting: • Monday 10/07/06 at 11:00 here. • Focus: Progress on today’s topics.
Transcript
TTF EMI/EMC Working Group Meeting 29/05/2006 H.Kapitza (FLA)
EMI Steering Group Report1. Epcos EMC Filter Seminar:
• On May 4, 2006 there was an EMC Filter Seminar held in the Novotel
HH-Schnelsen, organized by the Epcos company, the former passive
components branch of Siemens.
• The event was surprisingly neutral, with some very nice talks and good
documentation.
• Is there a problem to join such events?
2. Next meeting:
• Monday 10/07/06 at 11:00 here.
• Focus: Progress on today’s topics.
TTF EMI/EMC Working Group Meeting 29/05/2006 H.Kapitza (FLA)
XFEL Tunnel Grounding (2)
Topics:
1. Cross Section Update
2. Floor Inclusion
3. Mockup Tunnel
4. Next Steps
XFEL Facility Ground
• Due to its length >> λ(2 MHz)/10 = 15 m the XFEL facility needs a
hybrid ground system where many local single-point grounding areas are
connected to a common facility ground.
• In order to push its impedance as low as possible, the common facility
ground (plane) should include as much through-going metal structure as
possible (tubes, pipes, cable trays, remesh,. . .).
• Since these components will not really form a plane, aim at a mesh size
≈ λ(2 MHz)/50 = 3 m.
Röntgenlaser XFEL
Tunnelquerschnitt Modulstrecke – Bauliche Planung
Vorschlag fuer XTL Bodenplatten
Kantenschutz
Gewindeloch - M6 oder M8
Gitter (alle 24 - 48 m) - 3t belastbar
Fahrweg Installationsseite
T. Hott, 22 Mai 06
XFEL Mockup Tunnel
• On May 3, 2006 there was a meeting of all parties interested in an XFEL
mockup tunnel.
• Originally I expressed interest in operating a klystron there, fired by a
stretched out pulse cable.
• During the meeting the following became clear:
– Most parties are interested in logistics checks, with access as freely as
possible. Klystron operation will hinder this substantially.
– The mockup will be rather small, like 30 m long or so. For usage and
cost reasons that makes sense. But this is not the place to test
stretched out pulse cables.
– There are better test scenarios for the pulse cables.
� Currently no EMC use of XFEL mockup tunnel.
Next Steps
For the following points some understanding and some numbers are still
missing. They will be presented next time:
1. Energy radiated from the pulse cables and its absorption by the tunnel
mesh.
2. Pulse cable cutoff frequencies and consequences for the cable trays.
Umbau TTF2 Injector Rack Area
• A third hut for the synchronisation laser will be set up (end of July).
• The rack area will be partly rearranged and enclosed. At the same time an adequate ground plane will be prepared. Its current state is desolate.
• The power supply situation must be inspected and probably revised (power from two HVen). Meeting with J.Schäfer (MKK) on 24.04.06.
• At the same time remove old TTF1 ground system relics.
EMI shielding for the new Injectorlaser
EMI shielding for the new Injectorlaser
Right now no special shielding agains EMI, all cable connections are routed through two holes in the wall.
EMI shielding for the new Injectorlaser
Also the cable connections in the laser hut are not routed ideal to minimize crosstalk
Current problems- from outside
230V Mains
Current on compresse air
Current problems- from outside
230V Mains
Current onnetwork cable
Laser oscillator during maintenance day
Laser oscillator during normal run
Suspect: Modulator/Klystron
Current problems- from outside
Current problems- from inside
Pockelscell driver
Kabel tray
Current problems- from inside
PTO direct from photodiode via RG58
Output from on-table LEMO cable, not connected to the photodiode
The pockelscell outpus pulses (~4 kV) are visible - crosstalk
Shielding - floor
„Old“ hut
New hut
Shielding – walls, roof
Cable connections – routing through wall
http://www.roxtec.de/
EthernetOld scheme: Standard twisped pair connection from the switch in the injector area to every deviceNew proposal: One fiber link from the old control room in the laser, a switch "satellite" in the laser hut. But the satellite offers 24 ports, overkill? contact person: Thorsten Witt, 4568. Is it possible to use this satellite for both huts? Alternative: Media converters to get fiber links from the Injctor area.
TimingOld:New proposal: Fiber optic connection into the hut, timing distribution in the laser hut.
RFOld scheme: RF-Cables from the master into the laser hut.New proposal: RF-Cables decoupled by a DC-block into the hut.
BIS (temperatures, (door-)interlocksOld scheme: Cables from the devices to the BIS-box in the hutNew proposal:
Cable connections
Motor-ControlOld scheme: CAN-Bus controller in the injector area, cables to each motor.New proposal: Beckhoff controller box in the laser-hut. Connected via ethernet. Problems with different hardware in old/new laser?
Distance measurementOld scheme: Pick-up connected by cable to the measurement transceiver in the injector area.New proposals: Not urgend needed, to be planned but not connected. Is there a possibility to put a filter in the cable connection?
MainsOld scheme: Standard connectionNew proposal: Use a line filter or transformer.
