IAC 1-4-08
Today we installed the drift chambers and had our first beam on target.
DC HV and Gas
90/10 ArCo2
| HV settings | ||
| Wire | Volts | current (A) |
| Sense | 1500 | |
| Field | -750 | |
| Guard | 750 | |
Apparatus
The left figure above shows a close up view of the first Aluminum course collimator, followed by a wide (blue) scintillator, then an Aluminum brick with a 3 mm diameter hole, followed by the Drift chamber known as Plastica, then Metallica. Both detectors are sitting on a translation table capable of moving both horizontally and vertically. The right figure shows a wider view of the apparatus. Another scintillator paddle was placed downstream of the drift chambers. An efficiency measurement is facilitated using a coincidence formed between the first two scintillators which sandwhich the drift chambers.
We had an Aluminum brick with three different diameter (1, 3, and 6 mm) holes.
We put an aluminum brick in front of the electron beam in order to look at photons hitting the Drift Chamber.
We saw a signal out of the drift chamber once for every 10 gun pulses.
