The magnetic fields on the beam axis of helical undulators for the proposed International Linear Collider (ILC) gamma-ray production were calculated for undulator periods of 10 mm and 12 mm. The calculation assumed the use of low-carbon steel for the magnetic poles and a beam chamber outer diameter of 6.3 mm. Using NbTi superconducting coils at 4.2 K, the on-axis field for a 10-mm-period undulator was 0.62 T at the critical current density. The field for a 12-mm undulator period was 0.95 T, which gives a K value of 1.06. The K value for an 11-mm undulator with Nb{sub 3}Sn superconducting coils was estimated to about 1.1.

A photo of two immigration protesters, Adelfa Callejo and Hector Flores. They appear to be in the midst of an interview - a video camera and microphone are pointed in their direction. A large crowd of protesters gather behind them. Many in the crowd carry flags or banners.

A photo of Adelfa Callejo, a Dallas lawyer and civil rights activist who is a leader in the Hispanic community. She is seen here marching in the April 2006 "Mega March" in Dallas, Texas protesting immigration laws along with Hector Flores and other protestors.

Photograph of an alley scene in Breckenridge, Texas. There is a green dumpster to the far left of the photograph. Next to it is a white sign with black lettering that says "One Way Do Not Enter." A car drives through the alley. A fire escape can be seen on the third building in the background.

Fotografía de una bandera estadounidense sujeta a un sombrero rojo, marrón claro y verde que lleva un manifestante de la inmigración.

Una fotografía de manifestantes de la inmigración agitando banderas estadounidenses en la Mega Marcha de abril en Dallas. Se ven varias manos y la cara de un niño, parcialmente ocultas por las banderas.

Photograph of Andrew Ding playing viola for String Quartet No. 8 in C minor during a student recital held at Winspear Hall.

Photograph of the historic Arcadia Round Barn, off Route 66.

Photograph of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972.

Photograph of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. The building is at least twelve stories tall.

Photograph of the front of the Baker Hotel in Mineral Wells, built 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. It is at least twelve stories tall.

Photograph of the colonnade near the front entrance of the Baker Hotel in Mineral Wells, Texas. It was built in 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972. The floor is made of red brick, and the walls of slightly lighter brick.

Photograph of the colonnade at the Baker Hotel in Mineral Wells. It was built in 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972.

Photograph of the doorway to the Baker Hotel in Mineral Wells, Texas. There are double doors in white with glass windows. The door on the left has a sign warning against trespassing. The hotel was built in 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972.

Photograph of the top floor, called the "Cloud Room", at the Baker Hotel in Mineral Wells, Texas. There is a balcony around the wall. Several of the windows have been punched out. The hotel was built in 1929 by architects Wyatt C. Hendrick and Co. Architects. It has been vacant since 1972.

A young boy is lifted above a crowd of immigration protesters waving American flags. According to the Dallas Police Department, at least 100,000 people marched in the most well-attended civil movement in the history of Dallas. The protesters demanded the legalization of Hispanic undocumented immigrants, estimated to be about twelve million in the United States. The so-called "mega march" was carried out to demand immigrant amnesty as members of the U.S. Congress debated immigration reform.

At ten years of age, he has won several fights in his division. Like him, more than seventy students take advantage of the gym in the south of Fort Worth in exchange for keeping a good academic standing.

Photograph of a boy wearing blue and white boxing gloves preparing to hit a black and white punching ball.

A young boy protester is seen amongst a crowd of immigration protesters, signs, and American flags. According to the Dallas Police Department, at least 100,000 people marched in the most well-attended civil movement in the history of Dallas. The protesters demanded the legalization of Hispanic undocumented immigrants, estimated to be about twelve million in the United States. The so-called "mega march" was carried out to demand immigrant amnesty as members of the U.S. Congress debated immigration reform.

A young boy protester waves an American flag as he sits on the shoulders of another immigration protester. According to the Dallas Police Department, at least 100,000 people marched in the most well-attended civil movement in the history of Dallas. The protesters demanded the legalization of Hispanic undocumented immigrants, estimated to be about twelve million in the United States. The so-called "mega march" was carried out to demand immigrant amnesty as members of the U.S. Congress debated immigration reform.

Photograph of a boy at a gym practicing with blue boxing gloves and hitting a punching ball.

A young boy holds an American flag as he views the immigration march from the shoulders of another protester. According to the Dallas Police Department, at least 100,000 people marched in the most well-attended civil movement in the history of Dallas. The protesters demanded the legalization of Hispanic undocumented immigrants, estimated to be about twelve million in the United States. The so-called "mega march" was carried out to demand immigrant amnesty as members of the U.S. Congress debated immigration reform.

Immigration protesters march in the April "Mega March" in downtown Dallas. According to the Dallas Police Department, at least 100,000 people marched in the most well-attended civil movement in the history of Dallas. The protesters demanded the legalization of Hispanic undocumented immigrants, estimated to be about twelve million in the United States. Among those marching are Adelfa Callejo, a Dallas lawyer and civil rights activist who is a leader in the Hispanic community; Hector Flores, who has served as National President of the League of United Latin American Citizens (LULAC), Director of Recruitment and Retention for the Dallas Independent School District, and an Equal Opportunity Specialist for the Office of Civil Rights within the Department of Health, Education, and Welfare; and Domingo Garcia, a practicing attorney in Dallas who served as Mayor Pro Tem of Dallas, as a Dallas City Council member, and as a Texas legislator - he is the current General Counsel for the League of United Latin American Citizens (LULAC), a Latino civil rights organization. The so-called "mega march" was carried out to demand immigrant amnesty as members of the U.S. Congress debated immigration reform.

Carlos Francisco de Anda conducts an Early Education Program class. The program is designed to help parents prepare their children for school.