Log entry time 00:15:44 on January28,2004

Entry number 116942

16:00 

17:10 called MCC for status: doing Harp scans right now to 

   diagnose ongoing beam trip problem

18:03 beam ready, move in waterfall target

   ask for rastered 60 uA beam

18:06 get 61 uA beam, start run 2193

   after run modify prescalers for next run

18:18 start run 2194; notice that OTR "data valid: no"

   informed operator who will work on it.

18:40 OTR gives valid results; but width in y~0.34mm and in

   x ~ 0.2

   decide to tolerate this since the cooldown period is soon

18:58 Rich HV tripped, stop run, reset HV, start new run



Harp Scan done at 17:16 (Elog entry 1192665

IHAIC12: sigma-x = 0.141, sigma-y = 0.099

We will not do a further Harp scan before recooling entry at 20:00.



BPM-B at -0.01 /-0.08 (19:30)



NOTE: left septum was set

183.50 instead of 183.31 A

19:59 start ramping down left septum; ARM and Ed Faults go

  into Hall to recool septum

~21:45 beam permit, starting to ramp up magnet

~22:50 MCC askes for C target for harp scan, go to Carbon target

22:20: MCC is finished with Harp scans, moving waterfall

  target back in



Harp scan results:

1C12

7.4699998330325 uA CW MODE (DC) (IBCxxxxCRCUR2)

Raw Data File: IHA1C12.01272004_22:08

x sig: 0.1445 +/- 0.0085

u sig: 0.0978 +/- 0.0063

y sig: 0.0292 +/- 0.0013



22:23: left septum ready, target ready, ask for 60 uA, rastered

22:27, after starting run 2198, asked MCC if they could reduce

  width seen on OTR; values are same as before cooling shutdown

22:33: OTR: sigma-x= 0.125, sigma-y=0.220 (two days ago 0.07/0.16)

  Operator volonteered to call optics expert for advice.



NOTE: OTR is right after HARP, but does not necessarily give

  same reading, needs to be cross calibrated; Operator changed

  a filter, which changed the readings from 0.21/0.33 to 0.13/0.22

  without changes to the beam.

  With the current settings, used for 60 uA beam on Waterfall target,

  we get the following corresponding values:



  OTR sigma x/y    Harp sigma x/y

  0.125 / 0.220    0.145 / 0.030

  (yes, y is a factor of 7 different)





~22:48 Noticed that left septum magnet was not at full current

   as requested (readback was ~178 A) ; stopped run;

   reentered curent value; now PS current is 182.5, 

   Magnet current is 183.5 A.  



23:54 beam unstable, MCC wants retuning, putting in Carbon target

~0005 move waterfall target back in; get beam



looks like septa IOC don't communicate "Keep alive status" red;

ask for beam off since we don't see temperature



~00:00 reboot coda; ROCS 12 and 16 needed rebooting;



runs:

2193 Waterfall,

2194 Waterfall, prescalers have been changed

2195 Waterfall, Rich tripped shortly before end of run

2196 Waterfall

2197 Waterfall start at 19:27

2198 Waterfall start at 22:26, 60 uA; left Septum current ~ 5A too low

2199 Waterfall start at 22:52

2200 Waterfall start at 23:21 run stopped acquiring ~23:40 without

     visible error message; running at a couple