link

http://www.qudev.ethz.ch/phys4/

A software note

A lab friend told me about these 2 for 3D crystal structure drawing:

POV-ray

http://www.povray.org/

http://xahlee.org/3d/povray.html

Ortep III

http://www.ornl.gov/sci/ortep/ortep.html

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A nice site by accident:

http://xahlee.org

2nd day of exp(week)

Everything seems to be fine except the cooling water which is leaking 1~2 drops /day. It's dangerous but not so terribly dangerous now, so we are going to fix it some time this week. Hope it will take place on Friday so that I can realy complete something this week.

The high voltage power source is doing ok though a little noisy because of micro thunder inside.

1st day of the experiment week

After a weekend's relax, cryopump is full of gas vapour that was once condensed on the metal plate during pumping process of the previous week. It needs a restart.

1. Restart cryogenic pump

1.0 Get rid of the gas inside of the Cryogenic pump by using roughening pump.

1.0.1. Before doing anything (that one may regret later) make sure that:

• no contact between roughening pump and main chamber
• no contact between roughening pump and outside
• no contact between cryogenic pump and outside.

1.0.2 Connect roughening pump with Cryogenic pump　　make sure that the wire is connected and then turn the switch (that connect crogenic pump and roughening pump) on, there is a mechanic sound to confirm that the corresponding parts (inside) moved.

1.0.3 Turn on the roughening pump.
(It is a little better to turn on the roughening pump before turning on the switch, I feel)

1.1 Start the Cryogenic pump

When the pressure inside Cryogenic pump is about 70~100 mTorr.

1.1.1 Turn off the switch that that connect cryogenic pump and roughening pump, disconnect the wire of the switch from power, and turn off the roughening pump.

1.1.2 Turn on the cooling water for Cryo pump and then turn on the power of the Cryo pump.The temperature inside of Cryo will drop quickly from 293 K to 150 K within an hour (or 30 min, I forgot?).

2 hours later the temperature should stay at 8 K which is the working temperature of Cryo.

If the temperature didn't drop to 8k within 2 hours, the process of starting Cryo failed and one have to know the reason why it failed and prepare to start it the next day (wait a whole day for the condensed gas to vapor so that it's possible to be evacuated by roughening pump). The reason of failure is always that the 1.o process failed so that vacuum inside of Cryo was so bad that temperature can never drop to 8 K (too many gas molecules keep taking heat from the shell of cryo which is about the temperature of outside environment.)

Computation

I am beginning to study this. I searched internet for introductory materials and found a few links.

This page provide simple codes and nice links for beginners. "Education" link is also worth a check.
http://omlc.ogi.edu/software/mc/ http://www.ualberta.ca/~cdeutsch/MCS-course.htm

Miso's computational physics
http://www.geocities.jp/supermisosan/

Lecture note in Nagoya University (check 2002)
http://www.math.nagoya-u.ac.jp/~naito/lecture/

Other link: Moving Stars Around
http://www.artcompsci.org/msa/web/vol_1/v1_web/v1_web.html

"Go" mark words for today

EIT(electromagnetically induced transparency)

Kramers-Kronig

SOA(Semiconductor Optical Amplifier)

Physics link (for myself)

Physics link to Gingrich in University of Alberta.

some other small link

A collection of  physics courses not necessarily with notes. As a compensation to my own educational deficiency I always have to peek the education of others and sneak around on the internet.

What a shame for my excellent university! Soon it will be my Ex-university anyway!  

Physics link-Stephen Wolfram

I happened to find this today. This is a note for my humble self

http://www.stephenwolfram.com/publications/articles/physics/

Stephen Wolfram is the Mathematica guy. It is surprising to find his early works cover interesting theoretical physics topics.

 

A physics lecture link

Besides a set of physics course notes, you can find a super-cool Greek-English version of "Euclid's elements of geometry" and other mathematical stuffs!

http://farside.ph.utexas.edu

or see

http://farside.ph.utexas.edu/teaching.html