LHC Run in 2010

Geneva February 3, Last week, the Chamonix workshop once again proved its worth as a place where all the stakeholders in the LHC can come together, take difficult decisions and reach a consensus on important issues for the future of particle physics. The most important decision we reached last week is to run the LHC for 18 to 24 months at a collision energy of 7 TeV (3.5 TeV per beam). After that, we’ll go into a long shutdown in which we’ll do all the necessary work to allow us to reach the LHC’s design collision energy of 14 TeV for the next run. This means that when beams go back into the LHC later this month, we’ll be entering the longest phase of accelerator operation in CERN’s history, scheduled to take us into summer or autumn 2011.
What led us to this conclusion? Firstly, the LHC is unlike any previous CERN machine. Because it is a cryogenic facility, each run is accompanied by lengthy cool-down and warm-up phases. For that reason, CERN’s traditional ‘run through summer and shutdown for ]winter’ operational model had already been brought into question. Furthermore, we’ve known for some time that work is needed to prepare the LHC for running at energies significantly higher than the 7 TeV collision energy we’ve chosen for the first physics run. The latest data show that while we can run the LHC at 7 TeV without risk to the machine, running it at higher energy would require more work in the tunnel. These facts led us to a simple choice: run for a few months now and programme successive short shutdowns to step up in energy, or run for a long time now and schedule a single long shutdown before allowing 14 TeV (7 TeV per beam). 
A long run now is the right decision for the LHC and for the experiments. It gives the machine people the time necessary to prepare carefully for the work that’s needed before allowing 14 TeV. And for the experiments, 18 to 24 months will bring enough data across all the potential discovery areas to firmly establish the LHC as the world’s foremost facility for high-energy particle physics.


source: IPM&CERN

دکتر فرهاد اردلان به عنوان عضو برجسته انجمن فیزیک امریکا (APS Fellow) در سال ۲۰۰۹ برگزیده شد

به نقل از انجمن فيزيك ايران

http://www.psi.ir/html/news/news/news2_f.asp?id=102

هفتادمين باشگاه فيزيك: شتاب‌دهنده‌ي LHC

جلسه هفتادم


زمان: ۵/۱۱/۸۸

مکان: دانشکده فیزیک دانشگاه تهران



چكیده:

بزرگترین آزمایشگاه ذرات بنیادی جهان CERN، در کنار شهر ژنو سویس واقع شده است. این آزمایشگاه نزدیک ۲۰ سال است که شاهد طراحی و ساخت شتابدهنده LHC و آشکار سازهای مربوط به آن می باشد. هدف این شتابدهنده که اواخر سال گذشته میلادی با موفقیت راه اندازی شد و آزمایش های آن شناخت بهتر جهان ذرات بنیادی و بویژه کشف منشا جرم ذرات می باشد. در این سخنرانی با معرفی LHC و آزمایش CMS تعدادی از اهداف فیزیکی آنها مرور میشود.

براي جزيات بيشتر:‌كليك كنيد

دکتر علیمحمدی، استاد و فیزیک دان برجسته دانشگاه تهران ترور شد

به نقل از انجمن فيزيك ايران:

صبح امروز (سه شنبه ۲۲ دیماه) دکتر مسعود علیمحمدی، استاد دانشکده فیزیک دانشگاه تهران در مقابل منزل خود با انفجار بمبی

ترور شد. دکتر علیمحمدی از فیزیک دانان برجسته کشور در زمینه فیزیک ذرات بنیادی بودند و کارنامه درخشانی از فعالیت های علمی را دارا میباشند. ایشان اولین فارغ التحصیل دکتری فیزیک از دانشگاه صنعتی شریف بودند.

اتجمن فیزیک ایران ضمن محکوم کردن این عمل ناجوانمردانه، فقدان ایشان را به خانواده ی ایشان، جامعه فیزیک و کلیه دانشگاهیان کشور تسلیت میگوید.

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بدین وسیله به اطلاع می رساند مراسم تشیع پیکر آقای دکتر مسعود علی محمدی صبح روز پنجشنبه 24 دیماه ساعت 8:30 از منزل ایشان انجام میشود.

نشانی: تهران، خیابان دکتر شریعتی، بالاتر از پل صدر، خیابان سهیل، کوچه مهر سوم.

 

 

آدرس‌هاي مفيد:

 http://www.ipm.ac.ir/personalinfo.jsp?PeopleCode=IP9900112

http://en.wikipedia.org/wiki/Masoud_Alimohammadi

Generation of Circular Polarization of the CMB

Click Here

New Seminar in Larak

Speaker: Professor John Hauptman

"6 January 2010"

"16 Day 1388"

Title: New ideas for big detectors in high energy physics

Abstract: Three colliders beyond the LHC are being studied, two electron colliders and one muon collider. We are designing a new detector for these colliders based on dual-readout calorimetry by Wigmans, a nearly massless tracking system by Grancagnolo, and an iron-free flux return by Mikhailichenko. I will describe this detector and the physics it can do.

Time: 2:00 PM

Click Here

LHC ends 2009 run on a high note

Yesterday evening at 18:03, the LHC ended its first full period of operation in style. Collisions at 2.36 TeV recorded since last weekend have set a new world record and brought to a close a successful first run. The LHC has now been put into standby mode, and will restart in February 2010 following a short technical stop to prepare for higher energy collisions and the start of the main research programme.

A technical stop is needed to prepare the LHC for higher energy running in 2010. Before the 2009 running period began, all the necessary preparations to run up to a collision energy of 2.36 TeV had been carried out. To run at higher energy requires higher electrical currents in the LHC magnet circuits. This places more exacting demands on the new machine protection systems, which need to be readied for the task. Commissioning work for higher energies will be carried out in January, along with necessary adaptations to the hardware and software of the protection systems that have come to light during the 2009 run.

The success of the 2009 run is down to the skill and dedication of every one of you. Congratulations and thanks to you all.

17 December 2009