Search found 48 matches

by duanz
06 Jul 2022, 07:12
Forum: Bugs
Topic: Open side in MAXAMP
Replies: 1
Views: 4358

Open side in MAXAMP

Hi Michael,

When I set the "open_side" of MAXAMP, I need to specify both X_MAX and Y_MAX, to make the open_side setting take effect. If I only specify one of X_MAX & Y_MAX, it appears "open_side" is ignored. I guess this is somehow misleading. Please see the attached example.

Best,

Zhe
by duanz
03 Jun 2022, 06:45
Forum: Installation
Topic: sddsplot issue in macOS 10.14
Replies: 8
Views: 13750

Re: sddsplot issue in macOS 10.14

Hi, I spent some time recompiling SDDS on my Mac OS 10.15.6. Following Gregg's approach, I did brew install --cask xquartz & then brew install openmotif This installed XQuartz 2.8.1 and openmotif 2.3.8 After that, I had to modify epics/extensions/configure/os/CONFIG_SITE.darwin-x86.darwin-x86 changi...
by duanz
06 May 2022, 19:20
Forum: Installation
Topic: sddsplot issue in macOS 10.14
Replies: 8
Views: 13750

Re: sddsplot issue in macOS 10.14

Hi Soliday,

Are there any updates regarding the solution of the sddsplot issue as I mentioned in this post, on macOS 10.14 or later versions?

Thanks!

Best,

Zhe
by duanz
29 Dec 2021, 20:47
Forum: Ring Tracking
Topic: Off-momentum of a storage ring by offset the RF frequency
Replies: 1
Views: 2740

Off-momentum of a storage ring by offset the RF frequency

Hi Michael and all, I'm trying to offset the RF frequency of a storage ring and to observe the influence on closed orbit & equilibrium beam parameters. However, in the attached example, Cs in the %s.fin file did show the change of circumference due to the change of RF frequency, while the closed orb...
by duanz
16 Nov 2021, 20:04
Forum: Ring Tracking
Topic: How to properly fiducialize an RFMODE element
Replies: 2
Views: 3270

Re: How to properly fiducialize an RFMODE element

Thanks, Michael! This is exactly what I need.

Cheers,

Zhe
by duanz
17 Oct 2021, 03:58
Forum: Ring Tracking
Topic: How to properly fiducialize an RFMODE element
Replies: 2
Views: 3270

How to properly fiducialize an RFMODE element

Hi Michael, I'm trying to simulate a bunch injecting into an empty booster. I use a two-page bunch distribution in the tracking, the first page is a single-particle bunch for fiducialization, so that the second page can be the real bunch with a specified temporal error. However, RFMODE seems to accu...
by duanz
06 Sep 2021, 05:38
Forum: Feature Requests
Topic: Frequency feedback loop of RFMODE
Replies: 1
Views: 2328

Frequency feedback loop of RFMODE

Hi Michael, I wonder if it is possible to add the resonant frequency control loop in RFMODE. Since now piezo electric tuners are quite widely used in RF cavities, their response is quite fast. Sometimes it might be interesting to investigate their influence in the modeling of beam loading effects. T...
by duanz
20 Aug 2021, 22:59
Forum: Bugs
Topic: RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase
Replies: 4
Views: 2847

Re: RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase

Hi Michael,

Thanks for checking this out! I'll try using sddsmakedataset next time as you suggested.

Cheers,

Zhe
by duanz
12 Aug 2021, 21:53
Forum: Bugs
Topic: RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase
Replies: 4
Views: 2847

Re: RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase

Hi Michael, In the manual for RFMODE, V_SETPOINT & PHASE_SETPOINT are setpoints for total cavity voltage and phase. The amplitude/phase feedback loop is consistent with this statement. For I/Q feedback loop, in line 489/490, rfmode->voltageSetpoint & rfmode->phaseSetpoint are the total cavity voltag...
by duanz
10 Aug 2021, 01:54
Forum: Bugs
Topic: RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase
Replies: 4
Views: 2847

RFMODE I/Q feedback w/ PRELOAD or initial beam loading voltage/phase

Hi Michael, I'm using elegant 2021.1.0, I'm trying to use I/Q feedback of RFMODE to simulate an active RF cavity. As I understand, if PRELOAD is set, or initial beam loading voltage/phase is set up, i.e., the tracking starts with a specified initial beam loading \vec{Vb}, then the generator voltage ...