S. Lederer

PITZ-Collaboration meeting27th – 28th of Oct 2011

Status and News from the XFEL-Injector

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

AC.A1RF-gun

Gun-section compatible to FLASH

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

AC.A1AC.AH1

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

AC.AH1

Laser heater Magnets:Corrector + 2 quadsDiagnostic:Toroid, BMP, BAM, DCM

~700 mm for vacuum:Transition E-8 -> E-10 mbar+ gate valves and fast shutter

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

TDSAOTR VKICVKICOTROTR

BPM

Corrector

QuadQuadQuadQuadQuad

BPMBPM

EOD

CorrectorCorrector

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

OTROTRInjectordump

Dogleg

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XFEL-Injector

XTIN, injector floor, one month ago

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

XSE, looking into L1, one month ago

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun

Type will be prototype #4 type

Goal: One common design for XFEL, FLASH and PITZ – NO VACUUM WORK AFTER CONDITIONING

Solenoids and support frame from gun2

Check for optimization of water cooling distribution / connection

Position of micro-mover to be changed

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun – crucial issuesRF-window design

Major challenge at the moment: RF-window design Preferred solution is new

development MHF-p and Thales

Several mounting options under discussion, only one possibility shown

Full power through 1 window No SF6 but small overpressure

of air Requires more complicated

wave-guide distribution (4 wave-guide arms, 4 circulators, combination as close as possible to the window)

PMe-

Bend (vacuum pump to be included)

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun – crucial issuesRF-window design

PITZ design Set-up operable @ XFEL parameters

Gradient: OK Pulse length: OK but no long term

experience Trip rate: gun4.2 to high, gun4.1

presentation during this meeting will show

Two RF-windows with at the moment no guarantee of proper functionality

Wave-guides under SF6

Interlock sensors (esp. pick-up at wrong positions)-> redesign of T-combiner necessary

More complicated vacuum parts UHV directional coupler

One prototype in operation No particle free cleaning up to now, even

particle count not tested Bigger RF-gun assembly

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun – crucial issues

Flange connection of coaxial coupler under investigation for improvement: Currently extremely

limited space for nuts and tools -> complicated mounting

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun – not so crucial issuescontact spring

FLASH design Flat open spring Currently silver coated copper-

beryllium Particle creation during insertion /

removement of cathodes

Spring type

Vertical Horizontal

In Out Cleaning

In Out Cleaning

Ag coated

480-900 400-500 140-850 33-50 90-150 420-875

Au coated

75-120 230-320 1300 8 12 1200

plain 18-30 30-55 200-230 15 15 150

From the point of view of particle creation the uncoated copper-beryllium spring is best and the currently used Ag coated worst. Next step would be test in RF-gun: PITZ??

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun – not so crucial issuescontact spring

FermiLab design Round and closed (welded) spring Copper-beryllium Changed cathode layout

Up to now two damaged springs without extensive usage

Spring has to many degrees of freedom

Design changes necessary Still not proven if cathode layout

change reduces dark current

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

RF-gun: scheduleSchedule adapted to current injector installation schedule!

Design to be finished Dec-2011 PRR Dec-2011, if RF-window question is solved Gun body already in production Coaxial coupler production started Components ready for cleaning Apr-2012

Gun ready for installation at PITZ Dec-2012 Conditioning and predefined characterization program Gun ready for installation in XTIN Jul-2013

Sven Lederer PITZ-Collaboration meeting 27th-28th of Oct. 2011

Thanks for your attention!