Difference between revisions of "PosRun 10 14 2013"

From New IAC Wiki
Jump to navigation Jump to search
Line 64: Line 64:
 
|-
 
|-
 
|  6510  ||  min  s ( pulses) || same as previous run, removed graphite hardener and selection magnet, returned to dipoles in electron mode,
 
|  6510  ||  min  s ( pulses) || same as previous run, removed graphite hardener and selection magnet, returned to dipoles in electron mode,
 +
|}
 +
 +
===Shielded Cell direct beam with magnet===
 +
 +
reconfigure with magnet in shielded cell to deflect charged particles towards NaI detector #3,
 +
 +
{| border="1"  |cellpadding="20" cellspacing="0
 +
|-
 +
|  6511  ||  min  s ( pulses) ||  dipoles in electron mode, NaI at -700 Volts
 
|}
 
|}
  

Revision as of 22:17, 14 October 2013

Run list

Scaler channel #2 counts the number of beam pulses

Detector 4 is Beam Left and in ADC channel 7, Ortec Dual Spec amp set to course=10, fine=39, Canberra CFD set to 85 mV lower threshold

Detector 1 is Beam Right and in ADC channel 3, Ortec Dual Spec amp set to course=20, fine=10, Canberra CFD set to 70 mV lower threshold

In-flight

Run # Run Duration (s) Configuration
6488 min s 2->60Hz rep rate, Looking at NaI in shielded cell at -600 Volts, Magnet on Accelerator side deflects electrons, Tungsten target is out, triggering only on the beam gate and looking at ADC channel 3
6489 min s same as above except: 120Hz rep rate, -500 Volts,
6490 min s same as above except: -550 Volts,
6491 min s same as above except: -575 Volts,
6492 min s same as above except: inserted Aluminum brick to be sure electrons are staying on accelerator side, drops NaI output by factor of 2
6493 min s same as above except: -600 Volts
6494 min s same as above except: -700 Volts
6498 min s same as above except: -500 Volts, magnet out
6499 min s same as above except: -700 Volts, very similar ADC spectrum for magnet in
6500 min s (54420 , 120 Hz pulses =453.5 sec) same as above except: removed Al brick beam stop, increased current from zero until signal was observed in experimental cell NaI (probably mostly dark current from RF cavity)
6501 min s (54297 pulses) same as above except: inserted Al brick beam stop, R6500-01.png
6502 min s (54297 pulses) same as above except: REmoved Al brick beam stop

40 MeV on Tungsten

40 MeV electrons are hitting the positron production Tungsten target



Run # Run Duration (s) Configuration
6503 3 min 46 s ( pulses) Dipoles in positron mode. Al Brick in along 8 inch length
6504 min s ( pulses) same as previous run, Al brick OUT
6505 min s ( pulses) same as previous run, Dipoles in Electron mode, R6500-04-05 ch3.png
6506 min s ( pulses) same as previous run, Selection Magnet bending electrons up positioned after 50 micron Ti vacuum window, R6505-06 ch3.png
6507 min s ( pulses) same as previous run, dipoles set to positron mode and selection magnet rotated 180 degrees so positrons bend up,
6508 min s ( pulses) same as previous run:increase voltage from -700 to -850
6509 min s ( pulses) same as previous run, installed 2" thick graphite hardener
6510 min s ( pulses) same as previous run, removed graphite hardener and selection magnet, returned to dipoles in electron mode,

Shielded Cell direct beam with magnet

reconfigure with magnet in shielded cell to deflect charged particles towards NaI detector #3,

6511 min s ( pulses) dipoles in electron mode, NaI at -700 Volts

FC -vs- 90A beam stop correlation

FC = Aluminum brick 2" from exit window near NaI detectors


50 Ohm scope termination

90 A BS (nVs) FC (nVs)
47 25
24 11.9
13 6
6.1 2.3
4.8 1.8


Positrons_Using_40Mev_Linac