spec - Local Sector 7 web page

9.FOURC> br 2 0 010.FOURC> whH = 2 K = 0 L = 0ALPHA = -25.251 BETA = 25.251 AZIMUTH = 90 LAMBDA = 1.54Two Theta Theta Chi Phi50.5030 25.2515 90.0000 0.000011.FOURC>Youcan see where the motors would move for particular values of ( H, K, L )using theca H K L(calculate) macro.11.FOURC> ca 2 1 1Calculated Positions:H = 2 K = 1 L = 1ALPHA = -25.252 BETA = 25.252 AZIMUTH = -90 LAMBDA = 1.54Two Theta Theta Chi Phi62.9960 31.4980 54.7355 135.000012.FOURC>Conversely, spec will display the (H, K, L )that corresponds to a particular set ofmotor positions using the ci tth th chi phi (calculate inverse) macro.Asingle motor may be moved in real space using the mv motor position macro. Forexample,12.FOURC> mv tth 5013.FOURC>will move the 2θ motor to 50°. You are prompted for more input immediately, eventhough the motors are still moving.Youcan tell when the motor has stopped moving by using the w macro. The programwill pause until the motor has stopped moving and then generate a beep on the terminal.Alternatively, you can have the motor position displayed on the screen as it ismoving by invoking the umv (updated-move) macro instead of mv . Tostop the motorsbefore they have finished moving, type the interrupt character,usually a ˆC .Youcan use the mvr motor relative_position macro to move a motor relative toits current position.10 USER MANUAL AND TUTORIALS INTERIM WORK-IN-PROGRESS (8/16/01) NOT FOR GENERAL DISTRIBUTION