Page History

1176 

tagged g

3GeV

 600

BT1

0 degrees, center of tower 2

yes 

events in twr3?

 1177-1180

tagged g

e beam at 2.5GeV

 600

BT1

0 degrees, center of tower 2

yes

magnet ON, 25K evts per run 

 1206

 tagged gamma

e-  1GeV

 240

  idem

 S0:14k count per spill
HW trg: 100 count per spill
DAQ trg: 100 count per spill
Lot of 0 cluster in chamber 2 and 3, we need to tune the bending magnet and/or improve the veto to select a small spot.

 1207

 11/8

 tagged gamma

  240

  idem

 idem with S1 in the trigger
this run is to see if the zero that we see is a trigger or magner problem: it seem that it's a trigger issue: now the fraction of zero seems similar to what we saw in the other physics runs. 

 1208

11/8 11h34

 tagged gamma

 e-
1 GeV

 240

  idem

yes

  New trigger S3 in veto  - 25k

 1209

 11/8
13h29 

 tagged gamma

 e-
1GeV

 240

 idem

 yes and no

around 30k : SYNCHRONIZATION LOST !
stopping the run, first 30000 events should well sycnhronized...  

1210 

 11/8
16h34 

 tagged gamma

 e-
1GeV 

 240

 idem

 yes

 Synchronized Tagged gamma with 1GeV electron beam, going for 70k to get all the statistic : 100Kevents
(+25 k from 1208 this cpunt is not taken into account in the eloogbook)

 1211-1213

 11/8

  Tagged

 1 GeV

180-240

  BT1

 30° (x,y,z)=(200,13.2,-48)

 various Magnet currents for setting up

 1214

 Tagged

 e 1 GeV

 240

 BT1

 30° (x,y,z)=(200,13.2,-48)

 130k

 1215

 Tagged

 e 1GeV

 240

 BT1

 idem

 25k

 1216

 Tagged

 e 1 GeV

 240

 BT1

 idem

 25K

 1217

 11/8
21h22 

 Tagged

 e- 1 GeV

 240

 BT1

 idem

 30k
No spill during 4 minute

 1232

 12/08

 Tagged

 e- 2.5 GeV

 600

  BT1

 30° (x,y,z)=(200,13.2,-48)

 Not to be used , S4 not in the Trigger

 1233-1237

12/8 
7:21-9:36 

 Tagged

 e- 2.5

 600

 BT1

 idem

 1242

 12/8
11:45 

 e- 0.5 GeV

 100

  0 degrees, center of tower 2

 GeometryVerifiation

1243 

Tagged 

  e- 0.5 GeV

idem 

  0 degrees, center of tower 2

 yes

 rate too low

 1244-1245

12/08
12:44 13:35 

 Tagged

  e- 0.5 GeV

 120

  0 degrees, center of tower 2

 yes

 1246-1250

13:57 

 Tagged

  e- 0.5 GeV

120

  0 degrees, center of tower 2

 yes and no

 Sync lost after 6476 evts

1253-1258 

 tagged

e 0.5gev

 120

  0 degrees, center of tower 2

 yes

1272

13/8
3:52 

Tagged

e 2.5 GeV

600

48°

 Table moved to 48 deg, in order to allow full calrecon

 1273-1275

 13/8

Tagged 

e 2.5 GeV 

600 

 48°

 table@(-50,12.3,-48, 48deg)

 1276-1279

 13/8

 Tagged

 e 1GeV

 240

 48

idem 

 1287-1289

 13/8
11:07-12:41 

 Tagged

 e 0.5

 120

 48°

 Table(-50,12.3,-48, 48deg)
Trigger S0- S2- S4 -veto Sh - veto S3 - C1 - C2

 1290

 Junk

 1148-1164; 1166-1169

 8/8

e beam

various

BT1

0 degrees, various positions to align with tagger

yes

many different configurations, for expert only

 1170

e beam

1.5

BT1

0 degrees, center of tower 2

 yes

 dump in place, slits at 51.5

 1171

e beam

1.25 

BT1

0 degrees, center of tower 2

 yes

magnet current 600A, direct tagger calibration

 1172

e beam

1.125

BT1

0 degrees, center of tower 2

 yes

magnet current 600A, direct tagger calibration-NOT Synchronised

 1173

e beam

 1.375

BT1

0 degrees, center of tower 2

 yes

magnet current 600A, direct tagger calibration, slits reduce to 51

 1174

 8/8

e beam

1.125 

 BT1

0 degrees, center of tower 2

yes

magnet current 600A, direct tagger calibration

1282

13/8

e

BT1

48°,

Test - - Tagger calibration
Trigger is standard : S0.S2.S4.C1.C2.veto(S3+Sh)
Magnet Current set to 300A to shoot the beam directly in the Tagger.
300A is not enough trying to go up to 320A and then to 350A and then to 400A
400A is OK, Stopping run and start the Good On

 1283

 13/8

 e

 1 eEV

 BT1

 400 A

 1284

 13/8

 e

 0.75

 BT1

 330 A Synchronization Lost from the beginning...

 1285

 13/8

 e

0.75 GeV

BT1 

 Magnet Current = 330A
All 4 Si tagger chamber are fully populated.

 1286

13/8 

e 

.5 

 Magnet current @ 120 A
Pressure of C1 = 0.9 bars, C2=0.97 bars
Beam shut down after 18553 events