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PRS Prime Find!

PrimeGrid - Ut, 07.12.2021 - 17:17
On 18 September 2021, 06:50:25 UTC, PrimeGrid’s Primorial Prime Search, through PRPNet found the mega prime: 3267113#-1 The prime is 1,418,398 digits long and will enter Chris Caldwell's The Largest Known Primes Database ranked 1st for Primorial primes and 286th overall. The discovery was made by James Winskill (Aeneas) of New Zealand using an Intel(R) Xeon(R) W-2125 CPU @ 4.00GHz with 64GB RAM running Windows 10. This computer took 20 hours 32 minutes to complete the prp test using pfgw64. James Winskill is a member of the PrimeSearchTeam. The prp was verified on 26 September 2021, 01:56:46 UTC by an Intel i7-7700K @ 4.2 GHz with 16 GB RAM, running Gentoo/Linux. This computer took a little over 5 days 8 hours 38 minutes to verify primality of the prp using pfgw64. For more details, please see the official announcement.
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Africa Rainfall Project: December Update

World Community Grid - Po, 06.12.2021 - 17:20
The project's pace is at its fastest.
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Geminids Shower Challenge starts December 7th

PrimeGrid - So, 04.12.2021 - 09:11
The ninth and final challenge of the 2021 Series will be a 10-day challenge marking the yearly Geminids Meteor Shower. The challenge will be offered on the GFN-21, GFN-22, and GFN-DYFL subprojects, beginning 7 December 07:00 UTC and ending 17 December 07:00 UTC. To participate in the Challenge, please select only the GFN-21 and/or GFN-22 and/or GFN-DYFL subprojects in your PrimeGrid preferences section. For more info and discussion, check out the forum thread for this challenge: https://www.primegrid.com/forum_thread.php?id=9804&nowrap=true#152440
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SR5 Mega Prime Find!

PrimeGrid - Pi, 03.12.2021 - 22:12
On 8 October 2021, 01:38:53 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=102818 by finding the mega prime: 102818*5^3440382-1 The prime is 2,404,729 digits long and enters Chris Caldwell's “The Largest Known Primes Database” ranked 96th overall. 61 k’s now remain in the Riesel Base 5 problem. The discovery was made by Wes Hewitt (emoga) of Canada using an AMD Ryzen 9 5950X 16-Core Processor with 32GB RAM, running Microsoft Windows 10 Professional x64 Edition. This computer took about 1 hour, 29 minutes to complete the primality test using LLR2. Wes Hewitt is a member of TeAm AnandTech team. The prime was verified on 10 October 2021, 20:14 UTC, by an Intel(R) Core(TM) i7-9800X CPU @ 3.80GHz with 32GB of RAM, running CentOS. This computer took 20 hours and 39 minutes to complete the primality test using LLR2. For more details, please see the official announcement.
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Animated movie about neutron stars, pulsars, and continuous gravitational waves

Einstein@Home - Št, 02.12.2021 - 18:01

Join us on a journey into the depths of our Galaxy with an animated movie about neutron stars, pulsars, and continuous gravitational waves! This new video was created by Dr. M.A. Papa's research group that deploys the Einstein@Home gravitational wave searches. It will take you through our Galaxy to a very special type of star: a neutron star.

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Dlls under windows

GPUGRID - St, 01.12.2021 - 20:12
Is this still a problem? " There is still the issue with the bundled zip files not containing the Visual C++ redistributable runtime vcruntime140_1.dll for Windows hosts. " GDF
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Change in the scheduler

GPUGRID - St, 01.12.2021 - 17:21
I have made a change in the scheduler code yesterday. Let me know if now the server is assigning the correct application: Cuda10.1 for old drivers Cuda11 for newer drivers GDF
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Issue with certificates

GPUGRID - Po, 29.11.2021 - 18:32
Somehow the program to update the certificates stopped working. Now it is ok and the project is fine again.
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Thanks for supporting SixTrack at LHC@Home and updates

LHC@home - Ut, 23.01.2018 - 19:08
Dear volunteers,

All members of the SixTrack team would like to thank each of you for supporting our project at LHC@Home. The last weeks saw a significant increase in work load, and your constant help did not pause even during the Christmas holidays, which is something that we really appreciate!

As you know, we are interested in simulating the dynamics of the beam in ultra-relativistic storage rings, like the LHC. As in other fields of physics, the dynamics is complex, and it can be decomposed into a linear and a non-linear part. The former allows the expected performance of the machine to be at reach, whereas the latter might dramatically affect the stability of the circulating beam. While the former can be analysed with the computing power of a laptop, the latter requires BOINC, and hence you! In fact, we perform very large scans of parameter spaces to see how non-linearities affect the motion of beam particles in different regions of the beam phase space and for different values of key machine parameters. Our main observable is the dynamic aperture (DA), i.e. the boundary between stable, i.e. bounded, and unstable, i.e., unbounded, motion of particles.

The studies mainly target the LHC and its upgrade in luminosity, the so-called HL-LHC. Thanks to this new accelerator, by ~2035, the LHC will be able to deliver to experiments x10 more data than what is foreseen in the first 10/15y of operation of LHC in a comparable time. We are in full swing in designing the upgraded machine, and the present operation of the LHC is a unique occasion to benchmark our models and simulation results. The deep knowledge of the DA of the LHC is essential to properly tune the working point of the HL-LHC.

If you have crunched simulations named "workspace1_hl13_collision_scan_*" (Frederik), then you have helped us in mapping the effects of unavoidable magnetic errors expected from the new hardware of the HL-LHC on dynamic aperture, and identify the best working point of the machine and correction strategies. Tasks named like "w2_hllhc10_sqz700_Qinj_chr20_w2*" (Yuri) focus the attention onto the magnets responsible for squeezing the beams before colliding them; due to their prominent role, these magnets, very few in number, have such a big impact on the non-linear dynamics that the knobs controlling the linear part of the machine can offer relevant remedial strategies.

Many recent tasks are aimed at relating the beam lifetime to the dynamic aperture. The beam lifetime is a measured quantity that tells us how long the beams are going to stay in the machine, based on the current rate of losses. A theoretical model relating beam lifetime and dynamic aperture was developed; a large simulation campaign has started, to benchmark the model against plenty of measurements taken with the LHC in the past three years. One set of studies, named "w16_ats2017_b2_qp_0_ats2017_b2_QP_0_IOCT_0" (Pascal), considers as main source of non-linearities the unavoidable multipolar errors of the magnets, whereas tasks named as "LHC_2015*" (Javier) take into account the parasitic encounters nearby the collision points, i.e. the so called "long-range beam-beam effects".

One of our users (Ewen) is carrying out two studies thanks to your help. In 2017 DA was directly measured for the first time in the LHC at top energy, and nonlinear magnets on either side of ATLAS and CMS experiments were used to vary the DA. He wants to see how well the simulated DA compares to these measurements. The second study seeks to look systematically at how the time dependence of DA in simulation depends on the strength of linear transverse coupling, and the way it is generated in the machine. In fact, some previous simulations and measurements at injection energy have indicated that linear coupling between the horizontal and vertical planes can have a large impact on how the dynamic aperture evolves over time.

In all this, your help is fundamental, since you let us carry out the simulations and studies we are interested in, running the tasks we submit to BOINC. Hence, the warmest "thank you" to you all!
Happy crunching to everyone, and stay tuned!

Alessio and Massimo, for the LHC SixTrack team.
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LHC@home down-time due to system updates

LHC@home - Ut, 23.01.2018 - 11:19
Tomorrow Wednesday 24/1, the LHC@home servers will be unavailable for a short period while our storage backend is taken down for a system update.

Today, Tuesday 23/1, some of the Condor servers that handle CMS, LHCb and Theory tasks will be down for a while. Regarding the on-going issues with upload of files, please refer to this thread.

Thanks for your understanding and happy crunching!
Kategórie: Novinky z projektov

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