NOTE

• Never run harp #6with more than 5 microA CW
• This is an invasive measurement
• You can run a single harp scan with a cryogenic target in beam. However, if you have the time and/or plan to perform extended studies, i.e. a bull-eye scan, please move to the empty position.

• Login to jlabh1 as gougnaud. Password is ********
• cd to arc2/adl
• Open up an medm screen. Eventually, you have to type medm -cleanup
• Go to Execute Mode
• Open arc6_new.adl
• This will pop up the ARC6.adl medm screen
• Harp 5 is next to BPMA and harp 6 next to BPMB
• Harp 5 and 6 are SEM devices and do not need PM tube
• Harp 1,2 and 3,4 need PM tube to have HV. Set PM tube HV on HAC42; Ch 1.0 and 1.1 to -1200V
• Run with conditions:
• Mode: CW
• Current: 5.0 microA
• Arc Tuning: ACHRO
• Command file name: data56
• Make sure to hit the return button in the entry space for the value to register
• Don't worry about the Running command
• When everything is ready, click on the START button
• For command data56, the harp #5 will first do a forward scan and at the end a red profile with 3 peaks will show up. Then harp #6 will do a forward scan. Then harp#5 will proceed to do a return scan and a green profile will show up. Both the profiles should overlap each other. Then harp #6 will do a return scan. You can repeat the scans as many times as you like, just save the good ones for later analysis.
• For arc energy measurement use data1234 as the Command file name.
• A good scan will have the signal strength of the peaks between 5 and 10 volts. The gain of the signal can be adjusted by selected an amplification from the blue box just below the plot. It is trial and error to get a good scan. If signal is saturated a red spot will appear next to the plot and this flags a bad run.
• Once you have conditions for a good run. Start of CODA run with PS4=1 so that we have a data on tape with the BPM information. Then start a HARP run.
• Once you can a good run click on the Save button and stop CODA run. The saved file is in /home/gougnaud/arc2/ARC. The run number is automatically updated. Check its size. A single scan is ~240 kB.

 

• Login to jlabs2 as gougnaud. Password is ********
• Change to directory arc2/ARC/pascal  .
• The program is arc-scan. Type arc-scan to run.
• First one gets the question: run number or file name(default: number=  1)?
• Then the question :n(o plot), a(ll the plots) or just the l(ast plot)?
  Answer l for last plot.
• A plot of the Harp scan will appear in a HIGZ window. Use the plot window controls to zoom in on the third peak (counting left to right). Save the zoomed plot to a file higz.ps by clicking on to higz.ps  button.
• Click on exit button in HIGZ window. Then program will resume running.
• The information printed to the screen is saved in the file /home/gougnaud/arc2/ARC/scan_#.data.log where # is the run number.  Make a printout of the log file. Make a printout of the higz.ps file .
• In file harp_scans.dat  keep track of the harp scan run number, CODA run number, beam conditions ( raster on or off  , fast feedback on or off, etc),  for IHA1H03A list:  Absolute beam h position, Absolute beam v position, Horizontal beam base width (um) and Vertical beam base width (if given ) .For IHA1H03B list:  Absolute beam h position, Absolute beam v position, Horizontal beam base width (um), and Vertical beam base width (um).  Also list the Target beam h and v position and Target beam h and v angle.