1. presented by Elmar Vogel
ACC39 operation at FLASH TESLA Technology Collaboration (TTC) Meeting, INFN Milan, Italy, March 2011
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presented by Elmar Vogel

2. Phase space linearization works fine
'DESY News' 21st May 2010:
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3. Performance of the FNAL built ACC39
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presently, the maximum operable sum voltage is 22 MV (ø 16.5 MV/m)
restricted by interlocks...

4. Gradient restricting interlocks switching off the rf and the beam
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
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5. ACC39 is the prototype for the XFEL 3rd harmonic system
Major points of interest for XFEL 3.9 GHz design
Effects spoiling the transverse beam emittance?
coupler kicks?
transverse cavity (cell) alignment?
trapped HOMs?
HOM absorber heating due to RF operation and by beam?
remember braking HOM f-parts at first built 3.9 GHz cavities
HOMs are equipped with temperature sensors and interlocks!
do we get problems at high beam currents?
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
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6. No distortion of the transverse emittance due to ACC39
Comparison of transverse emittance with and without ACC39
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
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See theses from M. Kuhn, 'Influence of the Third Harmonic Module on the Beam Size‘, Hamburg University (2010)

7. Former problems with broken double leg f-parts in HOM absorbers
Problems with double leg f-parts: therefore FNAL designed single leg f-parts, also used for the XFEL!
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
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8. temperature readings of HOM absorber flanges
During FASH operation: no problems, even with high beam currents > 4 mA
bunch number
temperature readings of HOM absorber flanges
temperature readings at HOM absorber top hat position
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
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high beam current and 'normal FLASH' operation

9. picture of XFEL prototype
Conclusion: We are on the right way with the cavity and inner module design!
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
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picture of XFEL prototype
picture © DESY