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<div dir="ltr">Hi Andrei, I second Todd's response - it is good to bringing new ideas here as it would stimulate our colleagues to be more inclined to innovate. Rongli</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> Todd Satogata <satogata@jlab.org><br>
<b>Sent:</b> Sunday, August 4, 2024 3:13 PM<br>
<b>To:</b> Andrei Seryi <seryi@jlab.org>; Rongli Geng <geng@jlab.org><br>
<b>Cc:</b> acc_sem_comm@jlab.org <acc_sem_comm@jlab.org><br>
<b>Subject:</b> Re: new XFEL approach from Sasha Zholents?
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<div class="PlainText">Hi Andrei,<br>
<br>
Certainly, this would make a great division seminar. ODU folks<br>
had thought a bit about corrugated waveguides a while back so Jean<br>
and others would probably be interested as well. Pashupati is the<br>
chair of the seminar committee so Rongli and I can follow up with<br>
him; I'm also CC:ing the seminar committee email address. Cheers!<br>
<br>
-Todd<br>
<br>
======================================================================<br>
Todd Satogata<br>
Director, Center for Advanced Studies of Accelerators<br>
Jefferson Lab<br>
12000 Jefferson Avenue<br>
Newport News, VA 23606<br>
Cell: (631) 807-0674<br>
======================================================================<br>
<br>
On 8/4/24 2:55 PM, Andrei Seryi wrote:<br>
> Hi Todd and Rongli,<br>
> <br>
> Please see below abstract from Sasha about new approach for XFEL design.<br>
> <br>
> This sounds intriguing? Maybe it may be useful to ask him give a seminar?<br>
> <br>
> Cheers<br>
> <br>
> Andrei<br>
> <br>
> *From: *"azholents@anl.gov" <azholents@anl.gov><br>
> *Date: *Tuesday, July 30, 2024 at 15:22<br>
> *To: *Andrei Seryi <seryi@jlab.org><br>
> *Subject: *[EXTERNAL] your AAC talk<br>
> <br>
> Hi Andrei:<br>
> <br>
> I missed a chance to tell you in person that I liked your talk. I call it “A Realty Check for Dreamers”.<br>
> <br>
> During my stay in Naperville, I gave a seminar at APS/ANL on the subject covered by the abstract shown below.<br>
> <br>
> I wonder if this topic could be of interest for accelerator scientists at Jlab?<br>
> <br>
> Please let me know.<br>
> <br>
> Thank you,<br>
> <br>
> Sasha<br>
> <br>
> *A Corrugated Waveguide-Based Collinear Wakefield Accelerator for a Hard X-ray Free Electron Laser*<br>
> <br>
> The recent development of a corrugated waveguide-based collinear wakefield accelerator at the ANL marks a significant advancement toward realizing a facility with multiple high repetition rate hard X-ray Free-Electron Lasers. This achievement includes an
improved understanding of the factors limiting accelerator performance and the successful design, fabrication, and testing of key accelerator components:<br>
> <br>
> * A 2-mm diameter corrugated waveguide embedded inside a strong-back structure for holding and cooling the waveguide.<br>
> * Sub-terahertz frequency electromagnetic couplers for extracting the unused wakefield and diagnosing the onset of beam breakup instability (BBU).<br>
> * A quadrupole “wiggler” composed of alternating polarity strong quadrupoles for beam focusing and suppression of BBU.<br>
> * A compact, small-gap force neutral adjustable phase undulator (FNAPU) for enhanced FEL performance.<br>
> <br>
> The corrugated waveguides and couplers underwent rigorous testing with the electron beam at the Brookhaven National Laboratory's Accelerator Test Facility. Prototypes of the quadrupole "wiggler" and FNAPU were characterized in the magnetic field measurement
laboratory at APS. These comprehensive tests revealed a remarkable agreement between actual performance and anticipated design parameters, underscoring the robustness of collinear wakefield accelerator technology for future applications in
<br>
> the XFEL facility.<br>
> <br>
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